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block/cfq-iosched.c
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/* |
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* CFQ, or complete fairness queueing, disk scheduler. * * Based on ideas from a previously unfinished io * scheduler (round robin per-process disk scheduling) and Andrea Arcangeli. * |
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/sched/clock.h> |
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#include <linux/blkdev.h> #include <linux/elevator.h> |
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#include <linux/ktime.h> |
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#include <linux/rbtree.h> |
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#include <linux/ioprio.h> |
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#include <linux/blktrace_api.h> |
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#include <linux/blk-cgroup.h> |
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#include "blk.h" |
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#include "blk-wbt.h" |
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/* * tunables */ |
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/* max queue in one round of service */ |
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static const int cfq_quantum = 8; |
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static const u64 cfq_fifo_expire[2] = { NSEC_PER_SEC / 4, NSEC_PER_SEC / 8 }; |
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/* maximum backwards seek, in KiB */ static const int cfq_back_max = 16 * 1024; /* penalty of a backwards seek */ static const int cfq_back_penalty = 2; |
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static const u64 cfq_slice_sync = NSEC_PER_SEC / 10; static u64 cfq_slice_async = NSEC_PER_SEC / 25; |
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static const int cfq_slice_async_rq = 2; |
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static u64 cfq_slice_idle = NSEC_PER_SEC / 125; static u64 cfq_group_idle = NSEC_PER_SEC / 125; static const u64 cfq_target_latency = (u64)NSEC_PER_SEC * 3/10; /* 300 ms */ |
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static const int cfq_hist_divisor = 4; |
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|
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/* |
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* offset from end of queue service tree for idle class |
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*/ |
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#define CFQ_IDLE_DELAY (NSEC_PER_SEC / 5) |
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/* offset from end of group service tree under time slice mode */ #define CFQ_SLICE_MODE_GROUP_DELAY (NSEC_PER_SEC / 5) /* offset from end of group service under IOPS mode */ #define CFQ_IOPS_MODE_GROUP_DELAY (HZ / 5) |
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/* * below this threshold, we consider thinktime immediate */ |
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#define CFQ_MIN_TT (2 * NSEC_PER_SEC / HZ) |
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|
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#define CFQ_SLICE_SCALE (5) |
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#define CFQ_HW_QUEUE_MIN (5) |
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#define CFQ_SERVICE_SHIFT 12 |
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|
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#define CFQQ_SEEK_THR (sector_t)(8 * 100) |
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#define CFQQ_CLOSE_THR (sector_t)(8 * 1024) |
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#define CFQQ_SECT_THR_NONROT (sector_t)(2 * 32) |
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#define CFQQ_SEEKY(cfqq) (hweight32(cfqq->seek_history) > 32/8) |
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|
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#define RQ_CIC(rq) icq_to_cic((rq)->elv.icq) #define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elv.priv[0]) #define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elv.priv[1]) |
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|
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static struct kmem_cache *cfq_pool; |
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|
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#define CFQ_PRIO_LISTS IOPRIO_BE_NR #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) |
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#define cfq_class_rt(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_RT) |
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#define sample_valid(samples) ((samples) > 80) |
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#define rb_entry_cfqg(node) rb_entry((node), struct cfq_group, rb_node) |
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|
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/* blkio-related constants */ |
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#define CFQ_WEIGHT_LEGACY_MIN 10 #define CFQ_WEIGHT_LEGACY_DFL 500 #define CFQ_WEIGHT_LEGACY_MAX 1000 |
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struct cfq_ttime { |
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u64 last_end_request; |
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|
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u64 ttime_total; u64 ttime_mean; |
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unsigned long ttime_samples; |
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}; |
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/* |
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* Most of our rbtree usage is for sorting with min extraction, so * if we cache the leftmost node we don't have to walk down the tree * to find it. Idea borrowed from Ingo Molnars CFS scheduler. We should * move this into the elevator for the rq sorting as well. */ struct cfq_rb_root { |
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struct rb_root_cached rb; |
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struct rb_node *rb_rightmost; |
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unsigned count; |
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u64 min_vdisktime; |
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struct cfq_ttime ttime; |
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}; |
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#define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT_CACHED, \ |
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.rb_rightmost = NULL, \ |
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.ttime = {.last_end_request = ktime_get_ns(),},} |
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/* |
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* Per process-grouping structure */ struct cfq_queue { /* reference count */ |
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int ref; |
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/* various state flags, see below */ unsigned int flags; /* parent cfq_data */ struct cfq_data *cfqd; /* service_tree member */ struct rb_node rb_node; /* service_tree key */ |
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u64 rb_key; |
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/* prio tree member */ struct rb_node p_node; /* prio tree root we belong to, if any */ struct rb_root *p_root; /* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ struct request *next_rq; /* requests queued in sort_list */ int queued[2]; /* currently allocated requests */ int allocated[2]; /* fifo list of requests in sort_list */ struct list_head fifo; |
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/* time when queue got scheduled in to dispatch first request. */ |
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u64 dispatch_start; u64 allocated_slice; u64 slice_dispatch; |
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/* time when first request from queue completed and slice started. */ |
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u64 slice_start; u64 slice_end; |
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s64 slice_resid; |
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|
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/* pending priority requests */ int prio_pending; |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; /* io prio of this group */ unsigned short ioprio, org_ioprio; |
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unsigned short ioprio_class, org_ioprio_class; |
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|
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pid_t pid; |
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u32 seek_history; |
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sector_t last_request_pos; |
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struct cfq_rb_root *service_tree; |
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struct cfq_queue *new_cfqq; |
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struct cfq_group *cfqg; |
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/* Number of sectors dispatched from queue in single dispatch round */ unsigned long nr_sectors; |
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}; /* |
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* First index in the service_trees. |
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* IDLE is handled separately, so it has negative index */ |
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enum wl_class_t { |
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BE_WORKLOAD = 0, |
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RT_WORKLOAD = 1, IDLE_WORKLOAD = 2, |
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CFQ_PRIO_NR, |
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}; /* |
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* Second index in the service_trees. */ enum wl_type_t { ASYNC_WORKLOAD = 0, SYNC_NOIDLE_WORKLOAD = 1, SYNC_WORKLOAD = 2 }; |
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struct cfqg_stats { #ifdef CONFIG_CFQ_GROUP_IOSCHED |
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/* number of ios merged */ struct blkg_rwstat merged; /* total time spent on device in ns, may not be accurate w/ queueing */ struct blkg_rwstat service_time; /* total time spent waiting in scheduler queue in ns */ struct blkg_rwstat wait_time; /* number of IOs queued up */ struct blkg_rwstat queued; |
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/* total disk time and nr sectors dispatched by this group */ struct blkg_stat time; #ifdef CONFIG_DEBUG_BLK_CGROUP /* time not charged to this cgroup */ struct blkg_stat unaccounted_time; /* sum of number of ios queued across all samples */ struct blkg_stat avg_queue_size_sum; /* count of samples taken for average */ struct blkg_stat avg_queue_size_samples; /* how many times this group has been removed from service tree */ struct blkg_stat dequeue; /* total time spent waiting for it to be assigned a timeslice. */ struct blkg_stat group_wait_time; |
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/* time spent idling for this blkcg_gq */ |
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struct blkg_stat idle_time; /* total time with empty current active q with other requests queued */ struct blkg_stat empty_time; /* fields after this shouldn't be cleared on stat reset */ uint64_t start_group_wait_time; uint64_t start_idle_time; uint64_t start_empty_time; uint16_t flags; #endif /* CONFIG_DEBUG_BLK_CGROUP */ #endif /* CONFIG_CFQ_GROUP_IOSCHED */ }; |
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/* Per-cgroup data */ struct cfq_group_data { /* must be the first member */ |
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struct blkcg_policy_data cpd; |
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unsigned int weight; unsigned int leaf_weight; }; |
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/* This is per cgroup per device grouping structure */ struct cfq_group { |
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/* must be the first member */ struct blkg_policy_data pd; |
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/* group service_tree member */ struct rb_node rb_node; /* group service_tree key */ u64 vdisktime; |
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/* |
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* The number of active cfqgs and sum of their weights under this * cfqg. This covers this cfqg's leaf_weight and all children's * weights, but does not cover weights of further descendants. * * If a cfqg is on the service tree, it's active. An active cfqg * also activates its parent and contributes to the children_weight * of the parent. */ int nr_active; unsigned int children_weight; /* |
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* vfraction is the fraction of vdisktime that the tasks in this * cfqg are entitled to. This is determined by compounding the * ratios walking up from this cfqg to the root. * * It is in fixed point w/ CFQ_SERVICE_SHIFT and the sum of all * vfractions on a service tree is approximately 1. The sum may * deviate a bit due to rounding errors and fluctuations caused by * cfqgs entering and leaving the service tree. */ unsigned int vfraction; /* |
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* There are two weights - (internal) weight is the weight of this * cfqg against the sibling cfqgs. leaf_weight is the wight of * this cfqg against the child cfqgs. For the root cfqg, both * weights are kept in sync for backward compatibility. */ |
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unsigned int weight; |
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unsigned int new_weight; |
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unsigned int dev_weight; |
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|
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unsigned int leaf_weight; unsigned int new_leaf_weight; unsigned int dev_leaf_weight; |
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/* number of cfqq currently on this group */ int nr_cfqq; |
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/* |
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* Per group busy queues average. Useful for workload slice calc. We |
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* create the array for each prio class but at run time it is used * only for RT and BE class and slot for IDLE class remains unused. * This is primarily done to avoid confusion and a gcc warning. */ unsigned int busy_queues_avg[CFQ_PRIO_NR]; /* * rr lists of queues with requests. We maintain service trees for * RT and BE classes. These trees are subdivided in subclasses * of SYNC, SYNC_NOIDLE and ASYNC based on workload type. For IDLE * class there is no subclassification and all the cfq queues go on * a single tree service_tree_idle. |
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* Counts are embedded in the cfq_rb_root */ struct cfq_rb_root service_trees[2][3]; struct cfq_rb_root service_tree_idle; |
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|
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u64 saved_wl_slice; |
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enum wl_type_t saved_wl_type; enum wl_class_t saved_wl_class; |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; |
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struct cfq_ttime ttime; |
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struct cfqg_stats stats; /* stats for this cfqg */ |
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/* async queue for each priority case */ struct cfq_queue *async_cfqq[2][IOPRIO_BE_NR]; struct cfq_queue *async_idle_cfqq; |
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}; |
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struct cfq_io_cq { struct io_cq icq; /* must be the first member */ struct cfq_queue *cfqq[2]; struct cfq_ttime ttime; |
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int ioprio; /* the current ioprio */ #ifdef CONFIG_CFQ_GROUP_IOSCHED |
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uint64_t blkcg_serial_nr; /* the current blkcg serial */ |
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#endif |
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}; |
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/* |
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* Per block device queue structure */ |
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struct cfq_data { |
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struct request_queue *queue; |
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/* Root service tree for cfq_groups */ struct cfq_rb_root grp_service_tree; |
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struct cfq_group *root_group; |
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/* |
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* The priority currently being served |
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*/ |
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enum wl_class_t serving_wl_class; enum wl_type_t serving_wl_type; |
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u64 workload_expires; |
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struct cfq_group *serving_group; |
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/* * Each priority tree is sorted by next_request position. These * trees are used when determining if two or more queues are * interleaving requests (see cfq_close_cooperator). */ struct rb_root prio_trees[CFQ_PRIO_LISTS]; |
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unsigned int busy_queues; |
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unsigned int busy_sync_queues; |
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|
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int rq_in_driver; int rq_in_flight[2]; |
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/* * queue-depth detection */ int rq_queued; |
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int hw_tag; |
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/* * hw_tag can be * -1 => indeterminate, (cfq will behave as if NCQ is present, to allow better detection) * 1 => NCQ is present (hw_tag_est_depth is the estimated max depth) * 0 => no NCQ */ int hw_tag_est_depth; unsigned int hw_tag_samples; |
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|
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/* |
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* idle window management */ |
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struct hrtimer idle_slice_timer; |
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struct work_struct unplug_work; |
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|
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struct cfq_queue *active_queue; |
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struct cfq_io_cq *active_cic; |
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|
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sector_t last_position; |
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/* * tunables, see top of file */ unsigned int cfq_quantum; |
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unsigned int cfq_back_penalty; unsigned int cfq_back_max; |
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unsigned int cfq_slice_async_rq; |
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unsigned int cfq_latency; |
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u64 cfq_fifo_expire[2]; u64 cfq_slice[2]; u64 cfq_slice_idle; u64 cfq_group_idle; u64 cfq_target_latency; |
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/* * Fallback dummy cfqq for extreme OOM conditions */ struct cfq_queue oom_cfqq; |
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|
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u64 last_delayed_sync; |
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}; |
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static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd); |
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static void cfq_put_queue(struct cfq_queue *cfqq); |
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static struct cfq_rb_root *st_for(struct cfq_group *cfqg, |
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391 |
enum wl_class_t class, |
65b32a573 cfq-iosched: Remo... |
392 |
enum wl_type_t type) |
c0324a020 cfq-iosched: reim... |
393 |
{ |
1fa8f6d68 blkio: Introduce ... |
394 395 |
if (!cfqg) return NULL; |
3bf10fea3 cfq-iosched: Prop... |
396 |
if (class == IDLE_WORKLOAD) |
cdb16e8f7 blkio: Introduce ... |
397 |
return &cfqg->service_tree_idle; |
c0324a020 cfq-iosched: reim... |
398 |
|
3bf10fea3 cfq-iosched: Prop... |
399 |
return &cfqg->service_trees[class][type]; |
c0324a020 cfq-iosched: reim... |
400 |
} |
3b18152c3 [PATCH] CFQ io sc... |
401 |
enum cfqq_state_flags { |
b0b8d7494 cfq-iosched: docu... |
402 403 |
CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ |
b029195dd cfq-iosched: don'... |
404 |
CFQ_CFQQ_FLAG_must_dispatch, /* must be allowed a dispatch */ |
b0b8d7494 cfq-iosched: docu... |
405 |
CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ |
b0b8d7494 cfq-iosched: docu... |
406 407 408 |
CFQ_CFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ CFQ_CFQQ_FLAG_idle_window, /* slice idling enabled */ CFQ_CFQQ_FLAG_prio_changed, /* task priority has changed */ |
44f7c1606 cfq-iosched: defe... |
409 |
CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
91fac317a cfq-iosched: get ... |
410 |
CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
b3b6d0408 cfq: change the m... |
411 |
CFQ_CFQQ_FLAG_coop, /* cfqq is shared */ |
ae54abed6 cfq-iosched: spli... |
412 |
CFQ_CFQQ_FLAG_split_coop, /* shared cfqq will be splitted */ |
76280aff1 cfq-iosched: idli... |
413 |
CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */ |
f75edf2dc blkio: Wait for c... |
414 |
CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */ |
3b18152c3 [PATCH] CFQ io sc... |
415 416 417 418 419 |
}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
420 |
(cfqq)->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ |
3b18152c3 [PATCH] CFQ io sc... |
421 422 423 |
} \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
424 |
(cfqq)->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ |
3b18152c3 [PATCH] CFQ io sc... |
425 426 427 |
} \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
428 |
return ((cfqq)->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ |
3b18152c3 [PATCH] CFQ io sc... |
429 430 431 432 |
} CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); |
b029195dd cfq-iosched: don'... |
433 |
CFQ_CFQQ_FNS(must_dispatch); |
3b18152c3 [PATCH] CFQ io sc... |
434 |
CFQ_CFQQ_FNS(must_alloc_slice); |
3b18152c3 [PATCH] CFQ io sc... |
435 436 437 |
CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
44f7c1606 cfq-iosched: defe... |
438 |
CFQ_CFQQ_FNS(slice_new); |
91fac317a cfq-iosched: get ... |
439 |
CFQ_CFQQ_FNS(sync); |
a36e71f99 cfq-iosched: add ... |
440 |
CFQ_CFQQ_FNS(coop); |
ae54abed6 cfq-iosched: spli... |
441 |
CFQ_CFQQ_FNS(split_coop); |
76280aff1 cfq-iosched: idli... |
442 |
CFQ_CFQQ_FNS(deep); |
f75edf2dc blkio: Wait for c... |
443 |
CFQ_CFQQ_FNS(wait_busy); |
3b18152c3 [PATCH] CFQ io sc... |
444 |
#undef CFQ_CFQQ_FNS |
629ed0b10 blkcg: move stati... |
445 |
#if defined(CONFIG_CFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP) |
2ce4d50f9 cfq: collapse cfq... |
446 |
|
155fead9b blkcg: move blkio... |
447 448 449 450 451 |
/* cfqg stats flags */ enum cfqg_stats_flags { CFQG_stats_waiting = 0, CFQG_stats_idling, CFQG_stats_empty, |
629ed0b10 blkcg: move stati... |
452 |
}; |
155fead9b blkcg: move blkio... |
453 454 |
#define CFQG_FLAG_FNS(name) \ static inline void cfqg_stats_mark_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
455 |
{ \ |
155fead9b blkcg: move blkio... |
456 |
stats->flags |= (1 << CFQG_stats_##name); \ |
629ed0b10 blkcg: move stati... |
457 |
} \ |
155fead9b blkcg: move blkio... |
458 |
static inline void cfqg_stats_clear_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
459 |
{ \ |
155fead9b blkcg: move blkio... |
460 |
stats->flags &= ~(1 << CFQG_stats_##name); \ |
629ed0b10 blkcg: move stati... |
461 |
} \ |
155fead9b blkcg: move blkio... |
462 |
static inline int cfqg_stats_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
463 |
{ \ |
155fead9b blkcg: move blkio... |
464 |
return (stats->flags & (1 << CFQG_stats_##name)) != 0; \ |
629ed0b10 blkcg: move stati... |
465 |
} \ |
155fead9b blkcg: move blkio... |
466 467 468 469 |
CFQG_FLAG_FNS(waiting) CFQG_FLAG_FNS(idling) CFQG_FLAG_FNS(empty) #undef CFQG_FLAG_FNS |
629ed0b10 blkcg: move stati... |
470 471 |
/* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
472 |
static void cfqg_stats_update_group_wait_time(struct cfqg_stats *stats) |
629ed0b10 blkcg: move stati... |
473 474 |
{ unsigned long long now; |
155fead9b blkcg: move blkio... |
475 |
if (!cfqg_stats_waiting(stats)) |
629ed0b10 blkcg: move stati... |
476 477 478 479 480 481 |
return; now = sched_clock(); if (time_after64(now, stats->start_group_wait_time)) blkg_stat_add(&stats->group_wait_time, now - stats->start_group_wait_time); |
155fead9b blkcg: move blkio... |
482 |
cfqg_stats_clear_waiting(stats); |
629ed0b10 blkcg: move stati... |
483 484 485 |
} /* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
486 487 |
static void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) |
629ed0b10 blkcg: move stati... |
488 |
{ |
155fead9b blkcg: move blkio... |
489 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
490 |
|
155fead9b blkcg: move blkio... |
491 |
if (cfqg_stats_waiting(stats)) |
629ed0b10 blkcg: move stati... |
492 |
return; |
155fead9b blkcg: move blkio... |
493 |
if (cfqg == curr_cfqg) |
629ed0b10 blkcg: move stati... |
494 |
return; |
155fead9b blkcg: move blkio... |
495 496 |
stats->start_group_wait_time = sched_clock(); cfqg_stats_mark_waiting(stats); |
629ed0b10 blkcg: move stati... |
497 498 499 |
} /* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
500 |
static void cfqg_stats_end_empty_time(struct cfqg_stats *stats) |
629ed0b10 blkcg: move stati... |
501 502 |
{ unsigned long long now; |
155fead9b blkcg: move blkio... |
503 |
if (!cfqg_stats_empty(stats)) |
629ed0b10 blkcg: move stati... |
504 505 506 507 508 509 |
return; now = sched_clock(); if (time_after64(now, stats->start_empty_time)) blkg_stat_add(&stats->empty_time, now - stats->start_empty_time); |
155fead9b blkcg: move blkio... |
510 |
cfqg_stats_clear_empty(stats); |
629ed0b10 blkcg: move stati... |
511 |
} |
155fead9b blkcg: move blkio... |
512 |
static void cfqg_stats_update_dequeue(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
513 |
{ |
155fead9b blkcg: move blkio... |
514 |
blkg_stat_add(&cfqg->stats.dequeue, 1); |
629ed0b10 blkcg: move stati... |
515 |
} |
155fead9b blkcg: move blkio... |
516 |
static void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
517 |
{ |
155fead9b blkcg: move blkio... |
518 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
519 |
|
4d5e80a76 blkcg: s/blkg_rws... |
520 |
if (blkg_rwstat_total(&stats->queued)) |
629ed0b10 blkcg: move stati... |
521 522 523 524 525 526 527 |
return; /* * group is already marked empty. This can happen if cfqq got new * request in parent group and moved to this group while being added * to service tree. Just ignore the event and move on. */ |
155fead9b blkcg: move blkio... |
528 |
if (cfqg_stats_empty(stats)) |
629ed0b10 blkcg: move stati... |
529 530 531 |
return; stats->start_empty_time = sched_clock(); |
155fead9b blkcg: move blkio... |
532 |
cfqg_stats_mark_empty(stats); |
629ed0b10 blkcg: move stati... |
533 |
} |
155fead9b blkcg: move blkio... |
534 |
static void cfqg_stats_update_idle_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
535 |
{ |
155fead9b blkcg: move blkio... |
536 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
537 |
|
155fead9b blkcg: move blkio... |
538 |
if (cfqg_stats_idling(stats)) { |
629ed0b10 blkcg: move stati... |
539 540 541 542 543 |
unsigned long long now = sched_clock(); if (time_after64(now, stats->start_idle_time)) blkg_stat_add(&stats->idle_time, now - stats->start_idle_time); |
155fead9b blkcg: move blkio... |
544 |
cfqg_stats_clear_idling(stats); |
629ed0b10 blkcg: move stati... |
545 546 |
} } |
155fead9b blkcg: move blkio... |
547 |
static void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
548 |
{ |
155fead9b blkcg: move blkio... |
549 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
550 |
|
155fead9b blkcg: move blkio... |
551 |
BUG_ON(cfqg_stats_idling(stats)); |
629ed0b10 blkcg: move stati... |
552 553 |
stats->start_idle_time = sched_clock(); |
155fead9b blkcg: move blkio... |
554 |
cfqg_stats_mark_idling(stats); |
629ed0b10 blkcg: move stati... |
555 |
} |
155fead9b blkcg: move blkio... |
556 |
static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
557 |
{ |
155fead9b blkcg: move blkio... |
558 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
559 560 |
blkg_stat_add(&stats->avg_queue_size_sum, |
4d5e80a76 blkcg: s/blkg_rws... |
561 |
blkg_rwstat_total(&stats->queued)); |
629ed0b10 blkcg: move stati... |
562 |
blkg_stat_add(&stats->avg_queue_size_samples, 1); |
155fead9b blkcg: move blkio... |
563 |
cfqg_stats_update_group_wait_time(stats); |
629ed0b10 blkcg: move stati... |
564 565 566 |
} #else /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ |
f48ec1d78 cfq: fix build br... |
567 568 569 570 571 572 573 |
static inline void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) { } static inline void cfqg_stats_end_empty_time(struct cfqg_stats *stats) { } static inline void cfqg_stats_update_dequeue(struct cfq_group *cfqg) { } static inline void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) { } static inline void cfqg_stats_update_idle_time(struct cfq_group *cfqg) { } static inline void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) { } static inline void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { } |
629ed0b10 blkcg: move stati... |
574 575 576 577 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ #ifdef CONFIG_CFQ_GROUP_IOSCHED |
2ce4d50f9 cfq: collapse cfq... |
578 |
|
4ceab71b9 cfq-iosched: move... |
579 580 581 582 583 584 585 586 |
static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd) { return pd ? container_of(pd, struct cfq_group, pd) : NULL; } static struct cfq_group_data *cpd_to_cfqgd(struct blkcg_policy_data *cpd) { |
814376483 blkcg: minor upda... |
587 |
return cpd ? container_of(cpd, struct cfq_group_data, cpd) : NULL; |
4ceab71b9 cfq-iosched: move... |
588 589 590 591 592 593 |
} static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg) { return pd_to_blkg(&cfqg->pd); } |
ffea73fc7 block: blkcg_poli... |
594 595 596 597 598 599 |
static struct blkcg_policy blkcg_policy_cfq; static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg) { return pd_to_cfqg(blkg_to_pd(blkg, &blkcg_policy_cfq)); } |
e48453c38 block, cgroup: im... |
600 601 602 603 |
static struct cfq_group_data *blkcg_to_cfqgd(struct blkcg *blkcg) { return cpd_to_cfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_cfq)); } |
d02f7aa8d cfq-iosched: enab... |
604 |
static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) |
7918ffb5b cfq-iosched: impl... |
605 |
{ |
d02f7aa8d cfq-iosched: enab... |
606 |
struct blkcg_gq *pblkg = cfqg_to_blkg(cfqg)->parent; |
7918ffb5b cfq-iosched: impl... |
607 |
|
d02f7aa8d cfq-iosched: enab... |
608 |
return pblkg ? blkg_to_cfqg(pblkg) : NULL; |
7918ffb5b cfq-iosched: impl... |
609 |
} |
3984aa552 cfq-iosched: Allo... |
610 611 612 613 614 615 |
static inline bool cfqg_is_descendant(struct cfq_group *cfqg, struct cfq_group *ancestor) { return cgroup_is_descendant(cfqg_to_blkg(cfqg)->blkcg->css.cgroup, cfqg_to_blkg(ancestor)->blkcg->css.cgroup); } |
eb7d8c07f cfq: fix cfqg ref... |
616 617 618 619 620 621 622 623 624 |
static inline void cfqg_get(struct cfq_group *cfqg) { return blkg_get(cfqg_to_blkg(cfqg)); } static inline void cfqg_put(struct cfq_group *cfqg) { return blkg_put(cfqg_to_blkg(cfqg)); } |
54e7ed12b blkcg: remove blk... |
625 |
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \ |
35fe6d763 block: use standa... |
626 627 628 |
blk_add_cgroup_trace_msg((cfqd)->queue, \ cfqg_to_blkg((cfqq)->cfqg)->blkcg, \ "cfq%d%c%c " fmt, (cfqq)->pid, \ |
b226e5c41 cfq-iosched: Prin... |
629 630 |
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\ |
35fe6d763 block: use standa... |
631 |
##args); \ |
54e7ed12b blkcg: remove blk... |
632 633 634 |
} while (0) #define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \ |
35fe6d763 block: use standa... |
635 636 |
blk_add_cgroup_trace_msg((cfqd)->queue, \ cfqg_to_blkg(cfqg)->blkcg, fmt, ##args); \ |
54e7ed12b blkcg: remove blk... |
637 |
} while (0) |
2868ef7b3 blkio: Some debug... |
638 |
|
155fead9b blkcg: move blkio... |
639 |
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
ef295ecf0 block: better op ... |
640 641 |
struct cfq_group *curr_cfqg, unsigned int op) |
2ce4d50f9 cfq: collapse cfq... |
642 |
{ |
ef295ecf0 block: better op ... |
643 |
blkg_rwstat_add(&cfqg->stats.queued, op, 1); |
155fead9b blkcg: move blkio... |
644 645 |
cfqg_stats_end_empty_time(&cfqg->stats); cfqg_stats_set_start_group_wait_time(cfqg, curr_cfqg); |
2ce4d50f9 cfq: collapse cfq... |
646 |
} |
155fead9b blkcg: move blkio... |
647 |
static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
9a7f38c42 cfq-iosched: Conv... |
648 |
uint64_t time, unsigned long unaccounted_time) |
2ce4d50f9 cfq: collapse cfq... |
649 |
{ |
155fead9b blkcg: move blkio... |
650 |
blkg_stat_add(&cfqg->stats.time, time); |
629ed0b10 blkcg: move stati... |
651 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
155fead9b blkcg: move blkio... |
652 |
blkg_stat_add(&cfqg->stats.unaccounted_time, unaccounted_time); |
629ed0b10 blkcg: move stati... |
653 |
#endif |
2ce4d50f9 cfq: collapse cfq... |
654 |
} |
ef295ecf0 block: better op ... |
655 656 |
static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, unsigned int op) |
2ce4d50f9 cfq: collapse cfq... |
657 |
{ |
ef295ecf0 block: better op ... |
658 |
blkg_rwstat_add(&cfqg->stats.queued, op, -1); |
2ce4d50f9 cfq: collapse cfq... |
659 |
} |
ef295ecf0 block: better op ... |
660 661 |
static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, unsigned int op) |
2ce4d50f9 cfq: collapse cfq... |
662 |
{ |
ef295ecf0 block: better op ... |
663 |
blkg_rwstat_add(&cfqg->stats.merged, op, 1); |
2ce4d50f9 cfq: collapse cfq... |
664 |
} |
155fead9b blkcg: move blkio... |
665 |
static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
ef295ecf0 block: better op ... |
666 667 |
uint64_t start_time, uint64_t io_start_time, unsigned int op) |
2ce4d50f9 cfq: collapse cfq... |
668 |
{ |
155fead9b blkcg: move blkio... |
669 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
670 |
unsigned long long now = sched_clock(); |
629ed0b10 blkcg: move stati... |
671 672 |
if (time_after64(now, io_start_time)) |
ef295ecf0 block: better op ... |
673 |
blkg_rwstat_add(&stats->service_time, op, now - io_start_time); |
629ed0b10 blkcg: move stati... |
674 |
if (time_after64(io_start_time, start_time)) |
ef295ecf0 block: better op ... |
675 |
blkg_rwstat_add(&stats->wait_time, op, |
629ed0b10 blkcg: move stati... |
676 |
io_start_time - start_time); |
2ce4d50f9 cfq: collapse cfq... |
677 |
} |
689665af4 cfq-iosched: sepa... |
678 679 |
/* @stats = 0 */ static void cfqg_stats_reset(struct cfqg_stats *stats) |
155fead9b blkcg: move blkio... |
680 |
{ |
155fead9b blkcg: move blkio... |
681 |
/* queued stats shouldn't be cleared */ |
155fead9b blkcg: move blkio... |
682 683 684 685 686 687 688 689 690 691 692 693 694 695 |
blkg_rwstat_reset(&stats->merged); blkg_rwstat_reset(&stats->service_time); blkg_rwstat_reset(&stats->wait_time); blkg_stat_reset(&stats->time); #ifdef CONFIG_DEBUG_BLK_CGROUP blkg_stat_reset(&stats->unaccounted_time); blkg_stat_reset(&stats->avg_queue_size_sum); blkg_stat_reset(&stats->avg_queue_size_samples); blkg_stat_reset(&stats->dequeue); blkg_stat_reset(&stats->group_wait_time); blkg_stat_reset(&stats->idle_time); blkg_stat_reset(&stats->empty_time); #endif } |
0b39920b5 cfq-iosched: coll... |
696 |
/* @to += @from */ |
e6269c445 blkcg: add blkg_[... |
697 |
static void cfqg_stats_add_aux(struct cfqg_stats *to, struct cfqg_stats *from) |
0b39920b5 cfq-iosched: coll... |
698 699 |
{ /* queued stats shouldn't be cleared */ |
e6269c445 blkcg: add blkg_[... |
700 701 702 703 |
blkg_rwstat_add_aux(&to->merged, &from->merged); blkg_rwstat_add_aux(&to->service_time, &from->service_time); blkg_rwstat_add_aux(&to->wait_time, &from->wait_time); blkg_stat_add_aux(&from->time, &from->time); |
0b39920b5 cfq-iosched: coll... |
704 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
e6269c445 blkcg: add blkg_[... |
705 706 707 708 709 710 711 |
blkg_stat_add_aux(&to->unaccounted_time, &from->unaccounted_time); blkg_stat_add_aux(&to->avg_queue_size_sum, &from->avg_queue_size_sum); blkg_stat_add_aux(&to->avg_queue_size_samples, &from->avg_queue_size_samples); blkg_stat_add_aux(&to->dequeue, &from->dequeue); blkg_stat_add_aux(&to->group_wait_time, &from->group_wait_time); blkg_stat_add_aux(&to->idle_time, &from->idle_time); blkg_stat_add_aux(&to->empty_time, &from->empty_time); |
0b39920b5 cfq-iosched: coll... |
712 713 714 715 |
#endif } /* |
e6269c445 blkcg: add blkg_[... |
716 |
* Transfer @cfqg's stats to its parent's aux counts so that the ancestors' |
0b39920b5 cfq-iosched: coll... |
717 718 719 720 721 722 723 724 725 726 727 |
* recursive stats can still account for the amount used by this cfqg after * it's gone. */ static void cfqg_stats_xfer_dead(struct cfq_group *cfqg) { struct cfq_group *parent = cfqg_parent(cfqg); lockdep_assert_held(cfqg_to_blkg(cfqg)->q->queue_lock); if (unlikely(!parent)) return; |
e6269c445 blkcg: add blkg_[... |
728 |
cfqg_stats_add_aux(&parent->stats, &cfqg->stats); |
0b39920b5 cfq-iosched: coll... |
729 |
cfqg_stats_reset(&cfqg->stats); |
0b39920b5 cfq-iosched: coll... |
730 |
} |
eb7d8c07f cfq: fix cfqg ref... |
731 |
#else /* CONFIG_CFQ_GROUP_IOSCHED */ |
d02f7aa8d cfq-iosched: enab... |
732 |
static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) { return NULL; } |
3984aa552 cfq-iosched: Allo... |
733 734 735 736 737 |
static inline bool cfqg_is_descendant(struct cfq_group *cfqg, struct cfq_group *ancestor) { return true; } |
eb7d8c07f cfq: fix cfqg ref... |
738 739 |
static inline void cfqg_get(struct cfq_group *cfqg) { } static inline void cfqg_put(struct cfq_group *cfqg) { } |
7b679138b cfq-iosched: add ... |
740 |
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ |
b226e5c41 cfq-iosched: Prin... |
741 742 743 744 |
blk_add_trace_msg((cfqd)->queue, "cfq%d%c%c " fmt, (cfqq)->pid, \ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\ ##args) |
4495a7d41 CFQ: Fix typo and... |
745 |
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0) |
eb7d8c07f cfq: fix cfqg ref... |
746 |
|
155fead9b blkcg: move blkio... |
747 |
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
ef295ecf0 block: better op ... |
748 |
struct cfq_group *curr_cfqg, unsigned int op) { } |
155fead9b blkcg: move blkio... |
749 |
static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
9a7f38c42 cfq-iosched: Conv... |
750 |
uint64_t time, unsigned long unaccounted_time) { } |
ef295ecf0 block: better op ... |
751 752 753 754 |
static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, unsigned int op) { } static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, unsigned int op) { } |
155fead9b blkcg: move blkio... |
755 |
static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
ef295ecf0 block: better op ... |
756 757 |
uint64_t start_time, uint64_t io_start_time, unsigned int op) { } |
2ce4d50f9 cfq: collapse cfq... |
758 |
|
eb7d8c07f cfq: fix cfqg ref... |
759 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
7b679138b cfq-iosched: add ... |
760 761 |
#define cfq_log(cfqd, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) |
615f0259e blkio: Implement ... |
762 763 764 765 766 767 768 769 770 |
/* Traverses through cfq group service trees */ #define for_each_cfqg_st(cfqg, i, j, st) \ for (i = 0; i <= IDLE_WORKLOAD; i++) \ for (j = 0, st = i < IDLE_WORKLOAD ? &cfqg->service_trees[i][j]\ : &cfqg->service_tree_idle; \ (i < IDLE_WORKLOAD && j <= SYNC_WORKLOAD) || \ (i == IDLE_WORKLOAD && j == 0); \ j++, st = i < IDLE_WORKLOAD ? \ &cfqg->service_trees[i][j]: NULL) \ |
f5f2b6ceb CFQ: add think ti... |
771 772 773 |
static inline bool cfq_io_thinktime_big(struct cfq_data *cfqd, struct cfq_ttime *ttime, bool group_idle) { |
9a7f38c42 cfq-iosched: Conv... |
774 |
u64 slice; |
f5f2b6ceb CFQ: add think ti... |
775 776 777 778 779 780 781 782 |
if (!sample_valid(ttime->ttime_samples)) return false; if (group_idle) slice = cfqd->cfq_group_idle; else slice = cfqd->cfq_slice_idle; return ttime->ttime_mean > slice; } |
615f0259e blkio: Implement ... |
783 |
|
02b35081f cfq-iosched: Do g... |
784 785 786 787 788 789 790 791 792 793 794 795 796 797 |
static inline bool iops_mode(struct cfq_data *cfqd) { /* * If we are not idling on queues and it is a NCQ drive, parallel * execution of requests is on and measuring time is not possible * in most of the cases until and unless we drive shallower queue * depths and that becomes a performance bottleneck. In such cases * switch to start providing fairness in terms of number of IOs. */ if (!cfqd->cfq_slice_idle && cfqd->hw_tag) return true; else return false; } |
3bf10fea3 cfq-iosched: Prop... |
798 |
static inline enum wl_class_t cfqq_class(struct cfq_queue *cfqq) |
c0324a020 cfq-iosched: reim... |
799 800 801 802 803 804 805 |
{ if (cfq_class_idle(cfqq)) return IDLE_WORKLOAD; if (cfq_class_rt(cfqq)) return RT_WORKLOAD; return BE_WORKLOAD; } |
718eee057 cfq-iosched: fair... |
806 807 808 809 810 811 812 813 814 |
static enum wl_type_t cfqq_type(struct cfq_queue *cfqq) { if (!cfq_cfqq_sync(cfqq)) return ASYNC_WORKLOAD; if (!cfq_cfqq_idle_window(cfqq)) return SYNC_NOIDLE_WORKLOAD; return SYNC_WORKLOAD; } |
3bf10fea3 cfq-iosched: Prop... |
815 |
static inline int cfq_group_busy_queues_wl(enum wl_class_t wl_class, |
58ff82f34 blkio: Implement ... |
816 817 |
struct cfq_data *cfqd, struct cfq_group *cfqg) |
c0324a020 cfq-iosched: reim... |
818 |
{ |
3bf10fea3 cfq-iosched: Prop... |
819 |
if (wl_class == IDLE_WORKLOAD) |
cdb16e8f7 blkio: Introduce ... |
820 |
return cfqg->service_tree_idle.count; |
c0324a020 cfq-iosched: reim... |
821 |
|
34b98d03b cfq-iosched: Rena... |
822 823 824 |
return cfqg->service_trees[wl_class][ASYNC_WORKLOAD].count + cfqg->service_trees[wl_class][SYNC_NOIDLE_WORKLOAD].count + cfqg->service_trees[wl_class][SYNC_WORKLOAD].count; |
c0324a020 cfq-iosched: reim... |
825 |
} |
f26bd1f0a blkio: Determine ... |
826 827 828 |
static inline int cfqg_busy_async_queues(struct cfq_data *cfqd, struct cfq_group *cfqg) { |
34b98d03b cfq-iosched: Rena... |
829 830 |
return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count; |
f26bd1f0a blkio: Determine ... |
831 |
} |
165125e1e [BLOCK] Get rid o... |
832 |
static void cfq_dispatch_insert(struct request_queue *, struct request *); |
4f85cb96d block: make block... |
833 |
static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync, |
2da8de0bb cfq-iosched: remo... |
834 |
struct cfq_io_cq *cic, struct bio *bio); |
91fac317a cfq-iosched: get ... |
835 |
|
c58698073 block, cfq: reorg... |
836 837 838 839 840 |
static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq) { /* cic->icq is the first member, %NULL will convert to %NULL */ return container_of(icq, struct cfq_io_cq, icq); } |
47fdd4ca9 block, cfq: move ... |
841 842 843 844 845 846 847 |
static inline struct cfq_io_cq *cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc) { if (ioc) return icq_to_cic(ioc_lookup_icq(ioc, cfqd->queue)); return NULL; } |
c58698073 block, cfq: reorg... |
848 |
static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_cq *cic, bool is_sync) |
91fac317a cfq-iosched: get ... |
849 |
{ |
a6151c3a5 cfq-iosched: appl... |
850 |
return cic->cfqq[is_sync]; |
91fac317a cfq-iosched: get ... |
851 |
} |
c58698073 block, cfq: reorg... |
852 853 |
static inline void cic_set_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq, bool is_sync) |
91fac317a cfq-iosched: get ... |
854 |
{ |
a6151c3a5 cfq-iosched: appl... |
855 |
cic->cfqq[is_sync] = cfqq; |
91fac317a cfq-iosched: get ... |
856 |
} |
c58698073 block, cfq: reorg... |
857 |
static inline struct cfq_data *cic_to_cfqd(struct cfq_io_cq *cic) |
bca4b914b cfq-iosched: remo... |
858 |
{ |
c58698073 block, cfq: reorg... |
859 |
return cic->icq.q->elevator->elevator_data; |
bca4b914b cfq-iosched: remo... |
860 |
} |
91fac317a cfq-iosched: get ... |
861 |
/* |
99f95e528 [PATCH] cfq build... |
862 863 864 |
* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ |
23e018a1b block: get rid of... |
865 |
static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) |
99f95e528 [PATCH] cfq build... |
866 |
{ |
7b679138b cfq-iosched: add ... |
867 868 |
if (cfqd->busy_queues) { cfq_log(cfqd, "schedule dispatch"); |
59c3d45e4 block: remove 'q'... |
869 |
kblockd_schedule_work(&cfqd->unplug_work); |
7b679138b cfq-iosched: add ... |
870 |
} |
99f95e528 [PATCH] cfq build... |
871 |
} |
1da177e4c Linux-2.6.12-rc2 |
872 |
/* |
44f7c1606 cfq-iosched: defe... |
873 874 875 876 |
* Scale schedule slice based on io priority. Use the sync time slice only * if a queue is marked sync and has sync io queued. A sync queue with async * io only, should not get full sync slice length. */ |
9a7f38c42 cfq-iosched: Conv... |
877 |
static inline u64 cfq_prio_slice(struct cfq_data *cfqd, bool sync, |
d9e7620e6 cfq-iosched: rewo... |
878 |
unsigned short prio) |
44f7c1606 cfq-iosched: defe... |
879 |
{ |
9a7f38c42 cfq-iosched: Conv... |
880 881 |
u64 base_slice = cfqd->cfq_slice[sync]; u64 slice = div_u64(base_slice, CFQ_SLICE_SCALE); |
44f7c1606 cfq-iosched: defe... |
882 |
|
d9e7620e6 cfq-iosched: rewo... |
883 |
WARN_ON(prio >= IOPRIO_BE_NR); |
9a7f38c42 cfq-iosched: Conv... |
884 |
return base_slice + (slice * (4 - prio)); |
d9e7620e6 cfq-iosched: rewo... |
885 |
} |
44f7c1606 cfq-iosched: defe... |
886 |
|
9a7f38c42 cfq-iosched: Conv... |
887 |
static inline u64 |
d9e7620e6 cfq-iosched: rewo... |
888 889 890 |
cfq_prio_to_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { return cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio); |
44f7c1606 cfq-iosched: defe... |
891 |
} |
1d3650f71 cfq-iosched: impl... |
892 893 894 895 896 897 898 899 900 901 902 903 |
/** * cfqg_scale_charge - scale disk time charge according to cfqg weight * @charge: disk time being charged * @vfraction: vfraction of the cfqg, fixed point w/ CFQ_SERVICE_SHIFT * * Scale @charge according to @vfraction, which is in range (0, 1]. The * scaling is inversely proportional. * * scaled = charge / vfraction * * The result is also in fixed point w/ CFQ_SERVICE_SHIFT. */ |
9a7f38c42 cfq-iosched: Conv... |
904 |
static inline u64 cfqg_scale_charge(u64 charge, |
1d3650f71 cfq-iosched: impl... |
905 |
unsigned int vfraction) |
25bc6b077 blkio: Introduce ... |
906 |
{ |
1d3650f71 cfq-iosched: impl... |
907 |
u64 c = charge << CFQ_SERVICE_SHIFT; /* make it fixed point */ |
25bc6b077 blkio: Introduce ... |
908 |
|
1d3650f71 cfq-iosched: impl... |
909 910 |
/* charge / vfraction */ c <<= CFQ_SERVICE_SHIFT; |
9a7f38c42 cfq-iosched: Conv... |
911 |
return div_u64(c, vfraction); |
25bc6b077 blkio: Introduce ... |
912 913 914 915 916 917 918 919 920 921 |
} static inline u64 max_vdisktime(u64 min_vdisktime, u64 vdisktime) { s64 delta = (s64)(vdisktime - min_vdisktime); if (delta > 0) min_vdisktime = vdisktime; return min_vdisktime; } |
25bc6b077 blkio: Introduce ... |
922 923 |
static void update_min_vdisktime(struct cfq_rb_root *st) { |
09663c86e block/cfq: replac... |
924 925 |
if (!RB_EMPTY_ROOT(&st->rb.rb_root)) { struct cfq_group *cfqg = rb_entry_cfqg(st->rb.rb_leftmost); |
25bc6b077 blkio: Introduce ... |
926 |
|
a60327107 cfq-iosched: Fix ... |
927 928 |
st->min_vdisktime = max_vdisktime(st->min_vdisktime, cfqg->vdisktime); |
25bc6b077 blkio: Introduce ... |
929 |
} |
25bc6b077 blkio: Introduce ... |
930 |
} |
5db5d6427 cfq-iosched: adap... |
931 932 933 934 935 |
/* * get averaged number of queues of RT/BE priority. * average is updated, with a formula that gives more weight to higher numbers, * to quickly follows sudden increases and decrease slowly */ |
58ff82f34 blkio: Implement ... |
936 937 |
static inline unsigned cfq_group_get_avg_queues(struct cfq_data *cfqd, struct cfq_group *cfqg, bool rt) |
5869619cb cfq-iosched: fix ... |
938 |
{ |
5db5d6427 cfq-iosched: adap... |
939 940 941 |
unsigned min_q, max_q; unsigned mult = cfq_hist_divisor - 1; unsigned round = cfq_hist_divisor / 2; |
58ff82f34 blkio: Implement ... |
942 |
unsigned busy = cfq_group_busy_queues_wl(rt, cfqd, cfqg); |
5db5d6427 cfq-iosched: adap... |
943 |
|
58ff82f34 blkio: Implement ... |
944 945 946 |
min_q = min(cfqg->busy_queues_avg[rt], busy); max_q = max(cfqg->busy_queues_avg[rt], busy); cfqg->busy_queues_avg[rt] = (mult * max_q + min_q + round) / |
5db5d6427 cfq-iosched: adap... |
947 |
cfq_hist_divisor; |
58ff82f34 blkio: Implement ... |
948 949 |
return cfqg->busy_queues_avg[rt]; } |
9a7f38c42 cfq-iosched: Conv... |
950 |
static inline u64 |
58ff82f34 blkio: Implement ... |
951 952 |
cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) { |
41cad6ab2 cfq-iosched: conv... |
953 |
return cfqd->cfq_target_latency * cfqg->vfraction >> CFQ_SERVICE_SHIFT; |
5db5d6427 cfq-iosched: adap... |
954 |
} |
9a7f38c42 cfq-iosched: Conv... |
955 |
static inline u64 |
ba5bd520f cfq: rename a fun... |
956 |
cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
957 |
{ |
9a7f38c42 cfq-iosched: Conv... |
958 |
u64 slice = cfq_prio_to_slice(cfqd, cfqq); |
5db5d6427 cfq-iosched: adap... |
959 |
if (cfqd->cfq_latency) { |
58ff82f34 blkio: Implement ... |
960 961 962 963 964 965 |
/* * interested queues (we consider only the ones with the same * priority class in the cfq group) */ unsigned iq = cfq_group_get_avg_queues(cfqd, cfqq->cfqg, cfq_class_rt(cfqq)); |
9a7f38c42 cfq-iosched: Conv... |
966 967 968 |
u64 sync_slice = cfqd->cfq_slice[1]; u64 expect_latency = sync_slice * iq; u64 group_slice = cfq_group_slice(cfqd, cfqq->cfqg); |
58ff82f34 blkio: Implement ... |
969 970 |
if (expect_latency > group_slice) { |
9a7f38c42 cfq-iosched: Conv... |
971 972 |
u64 base_low_slice = 2 * cfqd->cfq_slice_idle; u64 low_slice; |
5db5d6427 cfq-iosched: adap... |
973 974 |
/* scale low_slice according to IO priority * and sync vs async */ |
9a7f38c42 cfq-iosched: Conv... |
975 976 |
low_slice = div64_u64(base_low_slice*slice, sync_slice); low_slice = min(slice, low_slice); |
5db5d6427 cfq-iosched: adap... |
977 978 |
/* the adapted slice value is scaled to fit all iqs * into the target latency */ |
9a7f38c42 cfq-iosched: Conv... |
979 980 |
slice = div64_u64(slice*group_slice, expect_latency); slice = max(slice, low_slice); |
5db5d6427 cfq-iosched: adap... |
981 982 |
} } |
c553f8e33 block cfq: compen... |
983 984 985 986 987 988 |
return slice; } static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
9a7f38c42 cfq-iosched: Conv... |
989 990 |
u64 slice = cfq_scaled_cfqq_slice(cfqd, cfqq); u64 now = ktime_get_ns(); |
c553f8e33 block cfq: compen... |
991 |
|
9a7f38c42 cfq-iosched: Conv... |
992 993 |
cfqq->slice_start = now; cfqq->slice_end = now + slice; |
f75edf2dc blkio: Wait for c... |
994 |
cfqq->allocated_slice = slice; |
9a7f38c42 cfq-iosched: Conv... |
995 |
cfq_log_cfqq(cfqd, cfqq, "set_slice=%llu", cfqq->slice_end - now); |
44f7c1606 cfq-iosched: defe... |
996 997 998 999 1000 1001 1002 |
} /* * We need to wrap this check in cfq_cfqq_slice_new(), since ->slice_end * isn't valid until the first request from the dispatch is activated * and the slice time set. */ |
a6151c3a5 cfq-iosched: appl... |
1003 |
static inline bool cfq_slice_used(struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
1004 1005 |
{ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
1006 |
return false; |
9a7f38c42 cfq-iosched: Conv... |
1007 |
if (ktime_get_ns() < cfqq->slice_end) |
c1e44756f cfq-iosched: do c... |
1008 |
return false; |
44f7c1606 cfq-iosched: defe... |
1009 |
|
c1e44756f cfq-iosched: do c... |
1010 |
return true; |
44f7c1606 cfq-iosched: defe... |
1011 1012 1013 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
1014 |
* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
1da177e4c Linux-2.6.12-rc2 |
1015 |
* We choose the request that is closest to the head right now. Distance |
e8a99053e [PATCH] cfq-iosch... |
1016 |
* behind the head is penalized and only allowed to a certain extent. |
1da177e4c Linux-2.6.12-rc2 |
1017 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
1018 |
static struct request * |
cf7c25cf9 cfq-iosched: fix ... |
1019 |
cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, sector_t last) |
1da177e4c Linux-2.6.12-rc2 |
1020 |
{ |
cf7c25cf9 cfq-iosched: fix ... |
1021 |
sector_t s1, s2, d1 = 0, d2 = 0; |
1da177e4c Linux-2.6.12-rc2 |
1022 |
unsigned long back_max; |
e8a99053e [PATCH] cfq-iosch... |
1023 1024 1025 |
#define CFQ_RQ1_WRAP 0x01 /* request 1 wraps */ #define CFQ_RQ2_WRAP 0x02 /* request 2 wraps */ unsigned wrap = 0; /* bit mask: requests behind the disk head? */ |
1da177e4c Linux-2.6.12-rc2 |
1026 |
|
5e7053747 [PATCH] cfq-iosch... |
1027 1028 1029 1030 |
if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
9c2c38a12 [PATCH] cfq-iosch... |
1031 |
|
229836bd6 cfq-iosched: redu... |
1032 1033 |
if (rq_is_sync(rq1) != rq_is_sync(rq2)) return rq_is_sync(rq1) ? rq1 : rq2; |
65299a3b7 block: separate p... |
1034 1035 |
if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_PRIO) return rq1->cmd_flags & REQ_PRIO ? rq1 : rq2; |
b53d1ed73 Revert "cfq: Remo... |
1036 |
|
83096ebf1 block: convert to... |
1037 1038 |
s1 = blk_rq_pos(rq1); s2 = blk_rq_pos(rq2); |
1da177e4c Linux-2.6.12-rc2 |
1039 |
|
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 |
/* * by definition, 1KiB is 2 sectors */ back_max = cfqd->cfq_back_max * 2; /* * Strict one way elevator _except_ in the case where we allow * short backward seeks which are biased as twice the cost of a * similar forward seek. */ if (s1 >= last) d1 = s1 - last; else if (s1 + back_max >= last) d1 = (last - s1) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
1055 |
wrap |= CFQ_RQ1_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
1056 1057 1058 1059 1060 1061 |
if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
1062 |
wrap |= CFQ_RQ2_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
1063 1064 |
/* Found required data */ |
e8a99053e [PATCH] cfq-iosch... |
1065 1066 1067 1068 1069 1070 |
/* * By doing switch() on the bit mask "wrap" we avoid having to * check two variables for all permutations: --> faster! */ switch (wrap) { |
5e7053747 [PATCH] cfq-iosch... |
1071 |
case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
1072 |
if (d1 < d2) |
5e7053747 [PATCH] cfq-iosch... |
1073 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1074 |
else if (d2 < d1) |
5e7053747 [PATCH] cfq-iosch... |
1075 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
1076 1077 |
else { if (s1 >= s2) |
5e7053747 [PATCH] cfq-iosch... |
1078 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1079 |
else |
5e7053747 [PATCH] cfq-iosch... |
1080 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
1081 |
} |
1da177e4c Linux-2.6.12-rc2 |
1082 |
|
e8a99053e [PATCH] cfq-iosch... |
1083 |
case CFQ_RQ2_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
1084 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1085 |
case CFQ_RQ1_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
1086 1087 |
return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
1088 1089 1090 1091 1092 1093 1094 1095 |
default: /* * Since both rqs are wrapped, * start with the one that's further behind head * (--> only *one* back seek required), * since back seek takes more time than forward. */ if (s1 <= s2) |
5e7053747 [PATCH] cfq-iosch... |
1096 |
return rq1; |
1da177e4c Linux-2.6.12-rc2 |
1097 |
else |
5e7053747 [PATCH] cfq-iosch... |
1098 |
return rq2; |
1da177e4c Linux-2.6.12-rc2 |
1099 1100 |
} } |
0871714e0 cfq-iosched: rela... |
1101 |
static struct cfq_queue *cfq_rb_first(struct cfq_rb_root *root) |
cc09e2990 [PATCH] cfq-iosch... |
1102 |
{ |
615f0259e blkio: Implement ... |
1103 1104 1105 |
/* Service tree is empty */ if (!root->count) return NULL; |
09663c86e block/cfq: replac... |
1106 |
return rb_entry(rb_first_cached(&root->rb), struct cfq_queue, rb_node); |
cc09e2990 [PATCH] cfq-iosch... |
1107 |
} |
1fa8f6d68 blkio: Introduce ... |
1108 1109 |
static struct cfq_group *cfq_rb_first_group(struct cfq_rb_root *root) { |
09663c86e block/cfq: replac... |
1110 |
return rb_entry_cfqg(rb_first_cached(&root->rb)); |
1fa8f6d68 blkio: Introduce ... |
1111 |
} |
09663c86e block/cfq: replac... |
1112 |
static void cfq_rb_erase(struct rb_node *n, struct cfq_rb_root *root) |
a36e71f99 cfq-iosched: add ... |
1113 |
{ |
f0f1a45f9 block/cfq: cache ... |
1114 1115 |
if (root->rb_rightmost == n) root->rb_rightmost = rb_prev(n); |
09663c86e block/cfq: replac... |
1116 |
rb_erase_cached(n, &root->rb); |
a36e71f99 cfq-iosched: add ... |
1117 |
RB_CLEAR_NODE(n); |
a36e71f99 cfq-iosched: add ... |
1118 |
|
aa6f6a3de cfq-iosched: prep... |
1119 |
--root->count; |
cc09e2990 [PATCH] cfq-iosch... |
1120 |
} |
1da177e4c Linux-2.6.12-rc2 |
1121 1122 1123 |
/* * would be nice to take fifo expire time into account as well */ |
5e7053747 [PATCH] cfq-iosch... |
1124 1125 1126 |
static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
1da177e4c Linux-2.6.12-rc2 |
1127 |
{ |
21183b07e [PATCH] cfq-iosch... |
1128 1129 |
struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
5e7053747 [PATCH] cfq-iosch... |
1130 |
struct request *next = NULL, *prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1131 |
|
21183b07e [PATCH] cfq-iosch... |
1132 |
BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
1da177e4c Linux-2.6.12-rc2 |
1133 1134 |
if (rbprev) |
5e7053747 [PATCH] cfq-iosch... |
1135 |
prev = rb_entry_rq(rbprev); |
1da177e4c Linux-2.6.12-rc2 |
1136 |
|
21183b07e [PATCH] cfq-iosch... |
1137 |
if (rbnext) |
5e7053747 [PATCH] cfq-iosch... |
1138 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
1139 1140 1141 |
else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
5e7053747 [PATCH] cfq-iosch... |
1142 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
1143 |
} |
1da177e4c Linux-2.6.12-rc2 |
1144 |
|
cf7c25cf9 cfq-iosched: fix ... |
1145 |
return cfq_choose_req(cfqd, next, prev, blk_rq_pos(last)); |
1da177e4c Linux-2.6.12-rc2 |
1146 |
} |
9a7f38c42 cfq-iosched: Conv... |
1147 1148 |
static u64 cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1149 |
{ |
d9e7620e6 cfq-iosched: rewo... |
1150 1151 1152 |
/* * just an approximation, should be ok. */ |
cdb16e8f7 blkio: Introduce ... |
1153 |
return (cfqq->cfqg->nr_cfqq - 1) * (cfq_prio_slice(cfqd, 1, 0) - |
464191c65 Revert "cfq: Make... |
1154 |
cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
d9e7620e6 cfq-iosched: rewo... |
1155 |
} |
1fa8f6d68 blkio: Introduce ... |
1156 1157 1158 1159 1160 1161 1162 1163 1164 |
static inline s64 cfqg_key(struct cfq_rb_root *st, struct cfq_group *cfqg) { return cfqg->vdisktime - st->min_vdisktime; } static void __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { |
09663c86e block/cfq: replac... |
1165 |
struct rb_node **node = &st->rb.rb_root.rb_node; |
1fa8f6d68 blkio: Introduce ... |
1166 1167 1168 |
struct rb_node *parent = NULL; struct cfq_group *__cfqg; s64 key = cfqg_key(st, cfqg); |
f0f1a45f9 block/cfq: cache ... |
1169 |
bool leftmost = true, rightmost = true; |
1fa8f6d68 blkio: Introduce ... |
1170 1171 1172 1173 |
while (*node != NULL) { parent = *node; __cfqg = rb_entry_cfqg(parent); |
f0f1a45f9 block/cfq: cache ... |
1174 |
if (key < cfqg_key(st, __cfqg)) { |
1fa8f6d68 blkio: Introduce ... |
1175 |
node = &parent->rb_left; |
f0f1a45f9 block/cfq: cache ... |
1176 1177 |
rightmost = false; } else { |
1fa8f6d68 blkio: Introduce ... |
1178 |
node = &parent->rb_right; |
09663c86e block/cfq: replac... |
1179 |
leftmost = false; |
1fa8f6d68 blkio: Introduce ... |
1180 1181 |
} } |
f0f1a45f9 block/cfq: cache ... |
1182 1183 |
if (rightmost) st->rb_rightmost = &cfqg->rb_node; |
1fa8f6d68 blkio: Introduce ... |
1184 |
rb_link_node(&cfqg->rb_node, parent, node); |
09663c86e block/cfq: replac... |
1185 |
rb_insert_color_cached(&cfqg->rb_node, &st->rb, leftmost); |
1fa8f6d68 blkio: Introduce ... |
1186 |
} |
7b5af5cff cfq-iosched: Add ... |
1187 1188 1189 |
/* * This has to be called only on activation of cfqg */ |
1fa8f6d68 blkio: Introduce ... |
1190 |
static void |
8184f93ec cfq-iosched: Don'... |
1191 1192 |
cfq_update_group_weight(struct cfq_group *cfqg) { |
3381cb8d2 blkcg: move blkio... |
1193 |
if (cfqg->new_weight) { |
8184f93ec cfq-iosched: Don'... |
1194 |
cfqg->weight = cfqg->new_weight; |
3381cb8d2 blkcg: move blkio... |
1195 |
cfqg->new_weight = 0; |
8184f93ec cfq-iosched: Don'... |
1196 |
} |
e15693ef1 cfq-iosched: Fix ... |
1197 1198 1199 1200 1201 1202 |
} static void cfq_update_group_leaf_weight(struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
e71357e11 cfq-iosched: add ... |
1203 1204 1205 1206 1207 |
if (cfqg->new_leaf_weight) { cfqg->leaf_weight = cfqg->new_leaf_weight; cfqg->new_leaf_weight = 0; } |
8184f93ec cfq-iosched: Don'... |
1208 1209 1210 1211 1212 |
} static void cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { |
1d3650f71 cfq-iosched: impl... |
1213 |
unsigned int vfr = 1 << CFQ_SERVICE_SHIFT; /* start with 1 */ |
7918ffb5b cfq-iosched: impl... |
1214 |
struct cfq_group *pos = cfqg; |
1d3650f71 cfq-iosched: impl... |
1215 |
struct cfq_group *parent; |
7918ffb5b cfq-iosched: impl... |
1216 1217 1218 |
bool propagate; /* add to the service tree */ |
8184f93ec cfq-iosched: Don'... |
1219 |
BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
7b5af5cff cfq-iosched: Add ... |
1220 1221 1222 1223 1224 |
/* * Update leaf_weight. We cannot update weight at this point * because cfqg might already have been activated and is * contributing its current weight to the parent's child_weight. */ |
e15693ef1 cfq-iosched: Fix ... |
1225 |
cfq_update_group_leaf_weight(cfqg); |
8184f93ec cfq-iosched: Don'... |
1226 |
__cfq_group_service_tree_add(st, cfqg); |
7918ffb5b cfq-iosched: impl... |
1227 1228 |
/* |
1d3650f71 cfq-iosched: impl... |
1229 1230 1231 1232 1233 1234 1235 |
* Activate @cfqg and calculate the portion of vfraction @cfqg is * entitled to. vfraction is calculated by walking the tree * towards the root calculating the fraction it has at each level. * The compounded ratio is how much vfraction @cfqg owns. * * Start with the proportion tasks in this cfqg has against active * children cfqgs - its leaf_weight against children_weight. |
7918ffb5b cfq-iosched: impl... |
1236 1237 1238 |
*/ propagate = !pos->nr_active++; pos->children_weight += pos->leaf_weight; |
1d3650f71 cfq-iosched: impl... |
1239 |
vfr = vfr * pos->leaf_weight / pos->children_weight; |
7918ffb5b cfq-iosched: impl... |
1240 |
|
1d3650f71 cfq-iosched: impl... |
1241 1242 1243 1244 1245 1246 |
/* * Compound ->weight walking up the tree. Both activation and * vfraction calculation are done in the same loop. Propagation * stops once an already activated node is met. vfraction * calculation should always continue to the root. */ |
d02f7aa8d cfq-iosched: enab... |
1247 |
while ((parent = cfqg_parent(pos))) { |
1d3650f71 cfq-iosched: impl... |
1248 |
if (propagate) { |
e15693ef1 cfq-iosched: Fix ... |
1249 |
cfq_update_group_weight(pos); |
1d3650f71 cfq-iosched: impl... |
1250 1251 1252 1253 |
propagate = !parent->nr_active++; parent->children_weight += pos->weight; } vfr = vfr * pos->weight / parent->children_weight; |
7918ffb5b cfq-iosched: impl... |
1254 1255 |
pos = parent; } |
1d3650f71 cfq-iosched: impl... |
1256 1257 |
cfqg->vfraction = max_t(unsigned, vfr, 1); |
8184f93ec cfq-iosched: Don'... |
1258 |
} |
5be6b7561 cfq-iosched: fix ... |
1259 1260 1261 1262 1263 1264 1265 |
static inline u64 cfq_get_cfqg_vdisktime_delay(struct cfq_data *cfqd) { if (!iops_mode(cfqd)) return CFQ_SLICE_MODE_GROUP_DELAY; else return CFQ_IOPS_MODE_GROUP_DELAY; } |
8184f93ec cfq-iosched: Don'... |
1266 1267 |
static void cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
1268 1269 1270 1271 1272 1273 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; struct cfq_group *__cfqg; struct rb_node *n; cfqg->nr_cfqq++; |
760701bfe cfq-iosched: Get ... |
1274 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
1fa8f6d68 blkio: Introduce ... |
1275 1276 1277 1278 1279 |
return; /* * Currently put the group at the end. Later implement something * so that groups get lesser vtime based on their weights, so that |
25985edce Fix common misspe... |
1280 |
* if group does not loose all if it was not continuously backlogged. |
1fa8f6d68 blkio: Introduce ... |
1281 |
*/ |
f0f1a45f9 block/cfq: cache ... |
1282 |
n = st->rb_rightmost; |
1fa8f6d68 blkio: Introduce ... |
1283 1284 |
if (n) { __cfqg = rb_entry_cfqg(n); |
5be6b7561 cfq-iosched: fix ... |
1285 1286 |
cfqg->vdisktime = __cfqg->vdisktime + cfq_get_cfqg_vdisktime_delay(cfqd); |
1fa8f6d68 blkio: Introduce ... |
1287 1288 |
} else cfqg->vdisktime = st->min_vdisktime; |
8184f93ec cfq-iosched: Don'... |
1289 1290 |
cfq_group_service_tree_add(st, cfqg); } |
1fa8f6d68 blkio: Introduce ... |
1291 |
|
8184f93ec cfq-iosched: Don'... |
1292 1293 1294 |
static void cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) { |
7918ffb5b cfq-iosched: impl... |
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 |
struct cfq_group *pos = cfqg; bool propagate; /* * Undo activation from cfq_group_service_tree_add(). Deactivate * @cfqg and propagate deactivation upwards. */ propagate = !--pos->nr_active; pos->children_weight -= pos->leaf_weight; while (propagate) { |
d02f7aa8d cfq-iosched: enab... |
1306 |
struct cfq_group *parent = cfqg_parent(pos); |
7918ffb5b cfq-iosched: impl... |
1307 1308 1309 |
/* @pos has 0 nr_active at this point */ WARN_ON_ONCE(pos->children_weight); |
1d3650f71 cfq-iosched: impl... |
1310 |
pos->vfraction = 0; |
7918ffb5b cfq-iosched: impl... |
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 |
if (!parent) break; propagate = !--parent->nr_active; parent->children_weight -= pos->weight; pos = parent; } /* remove from the service tree */ |
8184f93ec cfq-iosched: Don'... |
1321 1322 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) cfq_rb_erase(&cfqg->rb_node, st); |
1fa8f6d68 blkio: Introduce ... |
1323 1324 1325 |
} static void |
8184f93ec cfq-iosched: Don'... |
1326 |
cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
1327 1328 1329 1330 1331 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; BUG_ON(cfqg->nr_cfqq < 1); cfqg->nr_cfqq--; |
25bc6b077 blkio: Introduce ... |
1332 |
|
1fa8f6d68 blkio: Introduce ... |
1333 1334 1335 |
/* If there are other cfq queues under this group, don't delete it */ if (cfqg->nr_cfqq) return; |
2868ef7b3 blkio: Some debug... |
1336 |
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group"); |
8184f93ec cfq-iosched: Don'... |
1337 |
cfq_group_service_tree_del(st, cfqg); |
4d2ceea4c cfq-iosched: More... |
1338 |
cfqg->saved_wl_slice = 0; |
155fead9b blkcg: move blkio... |
1339 |
cfqg_stats_update_dequeue(cfqg); |
dae739ebc blkio: Group time... |
1340 |
} |
9a7f38c42 cfq-iosched: Conv... |
1341 1342 |
static inline u64 cfq_cfqq_slice_usage(struct cfq_queue *cfqq, u64 *unaccounted_time) |
dae739ebc blkio: Group time... |
1343 |
{ |
9a7f38c42 cfq-iosched: Conv... |
1344 1345 |
u64 slice_used; u64 now = ktime_get_ns(); |
dae739ebc blkio: Group time... |
1346 1347 1348 1349 1350 |
/* * Queue got expired before even a single request completed or * got expired immediately after first request completion. */ |
9a7f38c42 cfq-iosched: Conv... |
1351 |
if (!cfqq->slice_start || cfqq->slice_start == now) { |
dae739ebc blkio: Group time... |
1352 1353 1354 1355 1356 1357 |
/* * Also charge the seek time incurred to the group, otherwise * if there are mutiple queues in the group, each can dispatch * a single request on seeky media and cause lots of seek time * and group will never know it. */ |
0b31c10c6 cfq-iosched: Char... |
1358 1359 |
slice_used = max_t(u64, (now - cfqq->dispatch_start), jiffies_to_nsecs(1)); |
dae739ebc blkio: Group time... |
1360 |
} else { |
9a7f38c42 cfq-iosched: Conv... |
1361 |
slice_used = now - cfqq->slice_start; |
167400d34 blk-cgroup: Add u... |
1362 1363 |
if (slice_used > cfqq->allocated_slice) { *unaccounted_time = slice_used - cfqq->allocated_slice; |
f75edf2dc blkio: Wait for c... |
1364 |
slice_used = cfqq->allocated_slice; |
167400d34 blk-cgroup: Add u... |
1365 |
} |
9a7f38c42 cfq-iosched: Conv... |
1366 |
if (cfqq->slice_start > cfqq->dispatch_start) |
167400d34 blk-cgroup: Add u... |
1367 1368 |
*unaccounted_time += cfqq->slice_start - cfqq->dispatch_start; |
dae739ebc blkio: Group time... |
1369 |
} |
dae739ebc blkio: Group time... |
1370 1371 1372 1373 |
return slice_used; } static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, |
e5ff082e8 blkio: Fix anothe... |
1374 |
struct cfq_queue *cfqq) |
dae739ebc blkio: Group time... |
1375 1376 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; |
9a7f38c42 cfq-iosched: Conv... |
1377 |
u64 used_sl, charge, unaccounted_sl = 0; |
f26bd1f0a blkio: Determine ... |
1378 1379 |
int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg) - cfqg->service_tree_idle.count; |
1d3650f71 cfq-iosched: impl... |
1380 |
unsigned int vfr; |
9a7f38c42 cfq-iosched: Conv... |
1381 |
u64 now = ktime_get_ns(); |
f26bd1f0a blkio: Determine ... |
1382 1383 |
BUG_ON(nr_sync < 0); |
167400d34 blk-cgroup: Add u... |
1384 |
used_sl = charge = cfq_cfqq_slice_usage(cfqq, &unaccounted_sl); |
dae739ebc blkio: Group time... |
1385 |
|
02b35081f cfq-iosched: Do g... |
1386 1387 1388 1389 |
if (iops_mode(cfqd)) charge = cfqq->slice_dispatch; else if (!cfq_cfqq_sync(cfqq) && !nr_sync) charge = cfqq->allocated_slice; |
dae739ebc blkio: Group time... |
1390 |
|
1d3650f71 cfq-iosched: impl... |
1391 1392 1393 1394 1395 1396 1397 |
/* * Can't update vdisktime while on service tree and cfqg->vfraction * is valid only while on it. Cache vfr, leave the service tree, * update vdisktime and go back on. The re-addition to the tree * will also update the weights as necessary. */ vfr = cfqg->vfraction; |
8184f93ec cfq-iosched: Don'... |
1398 |
cfq_group_service_tree_del(st, cfqg); |
1d3650f71 cfq-iosched: impl... |
1399 |
cfqg->vdisktime += cfqg_scale_charge(charge, vfr); |
8184f93ec cfq-iosched: Don'... |
1400 |
cfq_group_service_tree_add(st, cfqg); |
dae739ebc blkio: Group time... |
1401 1402 |
/* This group is being expired. Save the context */ |
9a7f38c42 cfq-iosched: Conv... |
1403 1404 |
if (cfqd->workload_expires > now) { cfqg->saved_wl_slice = cfqd->workload_expires - now; |
4d2ceea4c cfq-iosched: More... |
1405 1406 |
cfqg->saved_wl_type = cfqd->serving_wl_type; cfqg->saved_wl_class = cfqd->serving_wl_class; |
dae739ebc blkio: Group time... |
1407 |
} else |
4d2ceea4c cfq-iosched: More... |
1408 |
cfqg->saved_wl_slice = 0; |
2868ef7b3 blkio: Some debug... |
1409 1410 1411 |
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, st->min_vdisktime); |
fd16d2631 block: Add __attr... |
1412 |
cfq_log_cfqq(cfqq->cfqd, cfqq, |
9a7f38c42 cfq-iosched: Conv... |
1413 |
"sl_used=%llu disp=%llu charge=%llu iops=%u sect=%lu", |
fd16d2631 block: Add __attr... |
1414 1415 |
used_sl, cfqq->slice_dispatch, charge, iops_mode(cfqd), cfqq->nr_sectors); |
155fead9b blkcg: move blkio... |
1416 1417 |
cfqg_stats_update_timeslice_used(cfqg, used_sl, unaccounted_sl); cfqg_stats_set_start_empty_time(cfqg); |
1fa8f6d68 blkio: Introduce ... |
1418 |
} |
f51b802c1 blkcg: use the us... |
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
/** * cfq_init_cfqg_base - initialize base part of a cfq_group * @cfqg: cfq_group to initialize * * Initialize the base part which is used whether %CONFIG_CFQ_GROUP_IOSCHED * is enabled or not. */ static void cfq_init_cfqg_base(struct cfq_group *cfqg) { struct cfq_rb_root *st; int i, j; for_each_cfqg_st(cfqg, i, j, st) *st = CFQ_RB_ROOT; RB_CLEAR_NODE(&cfqg->rb_node); |
9a7f38c42 cfq-iosched: Conv... |
1434 |
cfqg->ttime.last_end_request = ktime_get_ns(); |
f51b802c1 blkcg: use the us... |
1435 |
} |
25fb5169d blkio: Dynamic cf... |
1436 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
69d7fde59 blkcg: use CGROUP... |
1437 1438 |
static int __cfq_set_weight(struct cgroup_subsys_state *css, u64 val, bool on_dfl, bool reset_dev, bool is_leaf_weight); |
24bdb8ef0 blkcg: make blkcg... |
1439 |
static void cfqg_stats_exit(struct cfqg_stats *stats) |
90d3839b9 block: Use u64_st... |
1440 |
{ |
24bdb8ef0 blkcg: make blkcg... |
1441 1442 1443 1444 |
blkg_rwstat_exit(&stats->merged); blkg_rwstat_exit(&stats->service_time); blkg_rwstat_exit(&stats->wait_time); blkg_rwstat_exit(&stats->queued); |
24bdb8ef0 blkcg: make blkcg... |
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 |
blkg_stat_exit(&stats->time); #ifdef CONFIG_DEBUG_BLK_CGROUP blkg_stat_exit(&stats->unaccounted_time); blkg_stat_exit(&stats->avg_queue_size_sum); blkg_stat_exit(&stats->avg_queue_size_samples); blkg_stat_exit(&stats->dequeue); blkg_stat_exit(&stats->group_wait_time); blkg_stat_exit(&stats->idle_time); blkg_stat_exit(&stats->empty_time); #endif } static int cfqg_stats_init(struct cfqg_stats *stats, gfp_t gfp) { |
77ea73388 blkcg: move io_se... |
1459 |
if (blkg_rwstat_init(&stats->merged, gfp) || |
24bdb8ef0 blkcg: make blkcg... |
1460 1461 1462 |
blkg_rwstat_init(&stats->service_time, gfp) || blkg_rwstat_init(&stats->wait_time, gfp) || blkg_rwstat_init(&stats->queued, gfp) || |
24bdb8ef0 blkcg: make blkcg... |
1463 1464 |
blkg_stat_init(&stats->time, gfp)) goto err; |
90d3839b9 block: Use u64_st... |
1465 1466 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
24bdb8ef0 blkcg: make blkcg... |
1467 1468 1469 1470 1471 1472 1473 1474 |
if (blkg_stat_init(&stats->unaccounted_time, gfp) || blkg_stat_init(&stats->avg_queue_size_sum, gfp) || blkg_stat_init(&stats->avg_queue_size_samples, gfp) || blkg_stat_init(&stats->dequeue, gfp) || blkg_stat_init(&stats->group_wait_time, gfp) || blkg_stat_init(&stats->idle_time, gfp) || blkg_stat_init(&stats->empty_time, gfp)) goto err; |
90d3839b9 block: Use u64_st... |
1475 |
#endif |
24bdb8ef0 blkcg: make blkcg... |
1476 1477 1478 1479 |
return 0; err: cfqg_stats_exit(stats); return -ENOMEM; |
90d3839b9 block: Use u64_st... |
1480 |
} |
e4a9bde95 blkcg: replace bl... |
1481 1482 1483 |
static struct blkcg_policy_data *cfq_cpd_alloc(gfp_t gfp) { struct cfq_group_data *cgd; |
ebc4ff661 block: cfq_cpd_al... |
1484 |
cgd = kzalloc(sizeof(*cgd), gfp); |
e4a9bde95 blkcg: replace bl... |
1485 1486 1487 1488 |
if (!cgd) return NULL; return &cgd->cpd; } |
814376483 blkcg: minor upda... |
1489 |
static void cfq_cpd_init(struct blkcg_policy_data *cpd) |
e48453c38 block, cgroup: im... |
1490 |
{ |
814376483 blkcg: minor upda... |
1491 |
struct cfq_group_data *cgd = cpd_to_cfqgd(cpd); |
9e10a130d cgroup: replace c... |
1492 |
unsigned int weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ? |
69d7fde59 blkcg: use CGROUP... |
1493 |
CGROUP_WEIGHT_DFL : CFQ_WEIGHT_LEGACY_DFL; |
e48453c38 block, cgroup: im... |
1494 |
|
69d7fde59 blkcg: use CGROUP... |
1495 1496 1497 1498 1499 |
if (cpd_to_blkcg(cpd) == &blkcg_root) weight *= 2; cgd->weight = weight; cgd->leaf_weight = weight; |
e48453c38 block, cgroup: im... |
1500 |
} |
e4a9bde95 blkcg: replace bl... |
1501 1502 1503 1504 |
static void cfq_cpd_free(struct blkcg_policy_data *cpd) { kfree(cpd_to_cfqgd(cpd)); } |
69d7fde59 blkcg: use CGROUP... |
1505 1506 1507 |
static void cfq_cpd_bind(struct blkcg_policy_data *cpd) { struct blkcg *blkcg = cpd_to_blkcg(cpd); |
9e10a130d cgroup: replace c... |
1508 |
bool on_dfl = cgroup_subsys_on_dfl(io_cgrp_subsys); |
69d7fde59 blkcg: use CGROUP... |
1509 1510 1511 1512 1513 1514 1515 1516 |
unsigned int weight = on_dfl ? CGROUP_WEIGHT_DFL : CFQ_WEIGHT_LEGACY_DFL; if (blkcg == &blkcg_root) weight *= 2; WARN_ON_ONCE(__cfq_set_weight(&blkcg->css, weight, on_dfl, true, false)); WARN_ON_ONCE(__cfq_set_weight(&blkcg->css, weight, on_dfl, true, true)); } |
001bea73e blkcg: replace bl... |
1517 1518 |
static struct blkg_policy_data *cfq_pd_alloc(gfp_t gfp, int node) { |
b2ce2643c blk-throttle: cle... |
1519 1520 1521 1522 1523 1524 1525 |
struct cfq_group *cfqg; cfqg = kzalloc_node(sizeof(*cfqg), gfp, node); if (!cfqg) return NULL; cfq_init_cfqg_base(cfqg); |
24bdb8ef0 blkcg: make blkcg... |
1526 1527 1528 1529 |
if (cfqg_stats_init(&cfqg->stats, gfp)) { kfree(cfqg); return NULL; } |
b2ce2643c blk-throttle: cle... |
1530 1531 |
return &cfqg->pd; |
001bea73e blkcg: replace bl... |
1532 |
} |
a9520cd6f blkcg: make blkcg... |
1533 |
static void cfq_pd_init(struct blkg_policy_data *pd) |
f469a7b4d blk-cgroup: Allow... |
1534 |
{ |
a9520cd6f blkcg: make blkcg... |
1535 1536 |
struct cfq_group *cfqg = pd_to_cfqg(pd); struct cfq_group_data *cgd = blkcg_to_cfqgd(pd->blkg->blkcg); |
25fb5169d blkio: Dynamic cf... |
1537 |
|
e48453c38 block, cgroup: im... |
1538 1539 |
cfqg->weight = cgd->weight; cfqg->leaf_weight = cgd->leaf_weight; |
25fb5169d blkio: Dynamic cf... |
1540 |
} |
a9520cd6f blkcg: make blkcg... |
1541 |
static void cfq_pd_offline(struct blkg_policy_data *pd) |
0b39920b5 cfq-iosched: coll... |
1542 |
{ |
a9520cd6f blkcg: make blkcg... |
1543 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
60a837077 cfq-iosched: char... |
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 |
int i; for (i = 0; i < IOPRIO_BE_NR; i++) { if (cfqg->async_cfqq[0][i]) cfq_put_queue(cfqg->async_cfqq[0][i]); if (cfqg->async_cfqq[1][i]) cfq_put_queue(cfqg->async_cfqq[1][i]); } if (cfqg->async_idle_cfqq) cfq_put_queue(cfqg->async_idle_cfqq); |
0b39920b5 cfq-iosched: coll... |
1555 1556 1557 1558 1559 1560 |
/* * @blkg is going offline and will be ignored by * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so * that they don't get lost. If IOs complete after this point, the * stats for them will be lost. Oh well... */ |
60a837077 cfq-iosched: char... |
1561 |
cfqg_stats_xfer_dead(cfqg); |
0b39920b5 cfq-iosched: coll... |
1562 |
} |
001bea73e blkcg: replace bl... |
1563 1564 |
static void cfq_pd_free(struct blkg_policy_data *pd) { |
24bdb8ef0 blkcg: make blkcg... |
1565 1566 1567 1568 |
struct cfq_group *cfqg = pd_to_cfqg(pd); cfqg_stats_exit(&cfqg->stats); return kfree(cfqg); |
001bea73e blkcg: replace bl... |
1569 |
} |
a9520cd6f blkcg: make blkcg... |
1570 |
static void cfq_pd_reset_stats(struct blkg_policy_data *pd) |
689665af4 cfq-iosched: sepa... |
1571 |
{ |
a9520cd6f blkcg: make blkcg... |
1572 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
689665af4 cfq-iosched: sepa... |
1573 1574 |
cfqg_stats_reset(&cfqg->stats); |
25fb5169d blkio: Dynamic cf... |
1575 |
} |
ae1188963 blkcg: consolidat... |
1576 1577 |
static struct cfq_group *cfq_lookup_cfqg(struct cfq_data *cfqd, struct blkcg *blkcg) |
25fb5169d blkio: Dynamic cf... |
1578 |
{ |
ae1188963 blkcg: consolidat... |
1579 |
struct blkcg_gq *blkg; |
f469a7b4d blk-cgroup: Allow... |
1580 |
|
ae1188963 blkcg: consolidat... |
1581 1582 1583 1584 |
blkg = blkg_lookup(blkcg, cfqd->queue); if (likely(blkg)) return blkg_to_cfqg(blkg); return NULL; |
25fb5169d blkio: Dynamic cf... |
1585 1586 1587 1588 |
} static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { |
25fb5169d blkio: Dynamic cf... |
1589 |
cfqq->cfqg = cfqg; |
b1c357696 blkio: Take care ... |
1590 |
/* cfqq reference on cfqg */ |
eb7d8c07f cfq: fix cfqg ref... |
1591 |
cfqg_get(cfqg); |
b1c357696 blkio: Take care ... |
1592 |
} |
f95a04afa blkcg: embed stru... |
1593 1594 |
static u64 cfqg_prfill_weight_device(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
60c2bc2d5 blkcg: move conf/... |
1595 |
{ |
f95a04afa blkcg: embed stru... |
1596 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
3381cb8d2 blkcg: move blkio... |
1597 1598 |
if (!cfqg->dev_weight) |
60c2bc2d5 blkcg: move conf/... |
1599 |
return 0; |
f95a04afa blkcg: embed stru... |
1600 |
return __blkg_prfill_u64(sf, pd, cfqg->dev_weight); |
60c2bc2d5 blkcg: move conf/... |
1601 |
} |
2da8ca822 cgroup: replace c... |
1602 |
static int cfqg_print_weight_device(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1603 |
{ |
2da8ca822 cgroup: replace c... |
1604 1605 1606 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_weight_device, &blkcg_policy_cfq, 0, false); |
60c2bc2d5 blkcg: move conf/... |
1607 1608 |
return 0; } |
e71357e11 cfq-iosched: add ... |
1609 1610 1611 1612 1613 1614 1615 1616 1617 |
static u64 cfqg_prfill_leaf_weight_device(struct seq_file *sf, struct blkg_policy_data *pd, int off) { struct cfq_group *cfqg = pd_to_cfqg(pd); if (!cfqg->dev_leaf_weight) return 0; return __blkg_prfill_u64(sf, pd, cfqg->dev_leaf_weight); } |
2da8ca822 cgroup: replace c... |
1618 |
static int cfqg_print_leaf_weight_device(struct seq_file *sf, void *v) |
e71357e11 cfq-iosched: add ... |
1619 |
{ |
2da8ca822 cgroup: replace c... |
1620 1621 1622 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_leaf_weight_device, &blkcg_policy_cfq, 0, false); |
e71357e11 cfq-iosched: add ... |
1623 1624 |
return 0; } |
2da8ca822 cgroup: replace c... |
1625 |
static int cfq_print_weight(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1626 |
{ |
e48453c38 block, cgroup: im... |
1627 |
struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); |
9470e4a69 cfq-iosched: fix ... |
1628 1629 |
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg); unsigned int val = 0; |
e48453c38 block, cgroup: im... |
1630 |
|
9470e4a69 cfq-iosched: fix ... |
1631 1632 1633 1634 1635 |
if (cgd) val = cgd->weight; seq_printf(sf, "%u ", val); |
60c2bc2d5 blkcg: move conf/... |
1636 1637 |
return 0; } |
2da8ca822 cgroup: replace c... |
1638 |
static int cfq_print_leaf_weight(struct seq_file *sf, void *v) |
e71357e11 cfq-iosched: add ... |
1639 |
{ |
e48453c38 block, cgroup: im... |
1640 |
struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); |
9470e4a69 cfq-iosched: fix ... |
1641 1642 1643 1644 1645 |
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg); unsigned int val = 0; if (cgd) val = cgd->leaf_weight; |
e48453c38 block, cgroup: im... |
1646 |
|
9470e4a69 cfq-iosched: fix ... |
1647 1648 |
seq_printf(sf, "%u ", val); |
e71357e11 cfq-iosched: add ... |
1649 1650 |
return 0; } |
451af504d cgroup: replace c... |
1651 1652 |
static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off, |
2ee867dcf blkcg: implement ... |
1653 |
bool on_dfl, bool is_leaf_weight) |
60c2bc2d5 blkcg: move conf/... |
1654 |
{ |
69d7fde59 blkcg: use CGROUP... |
1655 1656 |
unsigned int min = on_dfl ? CGROUP_WEIGHT_MIN : CFQ_WEIGHT_LEGACY_MIN; unsigned int max = on_dfl ? CGROUP_WEIGHT_MAX : CFQ_WEIGHT_LEGACY_MAX; |
451af504d cgroup: replace c... |
1657 |
struct blkcg *blkcg = css_to_blkcg(of_css(of)); |
60c2bc2d5 blkcg: move conf/... |
1658 |
struct blkg_conf_ctx ctx; |
3381cb8d2 blkcg: move blkio... |
1659 |
struct cfq_group *cfqg; |
e48453c38 block, cgroup: im... |
1660 |
struct cfq_group_data *cfqgd; |
60c2bc2d5 blkcg: move conf/... |
1661 |
int ret; |
36aa9e5f5 blkcg: move body ... |
1662 |
u64 v; |
60c2bc2d5 blkcg: move conf/... |
1663 |
|
3c798398e blkcg: mass renam... |
1664 |
ret = blkg_conf_prep(blkcg, &blkcg_policy_cfq, buf, &ctx); |
60c2bc2d5 blkcg: move conf/... |
1665 1666 |
if (ret) return ret; |
2ee867dcf blkcg: implement ... |
1667 1668 1669 1670 1671 1672 1673 1674 1675 |
if (sscanf(ctx.body, "%llu", &v) == 1) { /* require "default" on dfl */ ret = -ERANGE; if (!v && on_dfl) goto out_finish; } else if (!strcmp(strim(ctx.body), "default")) { v = 0; } else { ret = -EINVAL; |
36aa9e5f5 blkcg: move body ... |
1676 |
goto out_finish; |
2ee867dcf blkcg: implement ... |
1677 |
} |
36aa9e5f5 blkcg: move body ... |
1678 |
|
3381cb8d2 blkcg: move blkio... |
1679 |
cfqg = blkg_to_cfqg(ctx.blkg); |
e48453c38 block, cgroup: im... |
1680 |
cfqgd = blkcg_to_cfqgd(blkcg); |
ae994ea97 cfq-iosched: fix ... |
1681 |
|
20386ce01 blkcg: refine err... |
1682 |
ret = -ERANGE; |
69d7fde59 blkcg: use CGROUP... |
1683 |
if (!v || (v >= min && v <= max)) { |
e71357e11 cfq-iosched: add ... |
1684 |
if (!is_leaf_weight) { |
36aa9e5f5 blkcg: move body ... |
1685 1686 |
cfqg->dev_weight = v; cfqg->new_weight = v ?: cfqgd->weight; |
e71357e11 cfq-iosched: add ... |
1687 |
} else { |
36aa9e5f5 blkcg: move body ... |
1688 1689 |
cfqg->dev_leaf_weight = v; cfqg->new_leaf_weight = v ?: cfqgd->leaf_weight; |
e71357e11 cfq-iosched: add ... |
1690 |
} |
60c2bc2d5 blkcg: move conf/... |
1691 1692 |
ret = 0; } |
36aa9e5f5 blkcg: move body ... |
1693 |
out_finish: |
60c2bc2d5 blkcg: move conf/... |
1694 |
blkg_conf_finish(&ctx); |
451af504d cgroup: replace c... |
1695 |
return ret ?: nbytes; |
60c2bc2d5 blkcg: move conf/... |
1696 |
} |
451af504d cgroup: replace c... |
1697 1698 |
static ssize_t cfqg_set_weight_device(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) |
e71357e11 cfq-iosched: add ... |
1699 |
{ |
2ee867dcf blkcg: implement ... |
1700 |
return __cfqg_set_weight_device(of, buf, nbytes, off, false, false); |
e71357e11 cfq-iosched: add ... |
1701 |
} |
451af504d cgroup: replace c... |
1702 1703 |
static ssize_t cfqg_set_leaf_weight_device(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) |
e71357e11 cfq-iosched: add ... |
1704 |
{ |
2ee867dcf blkcg: implement ... |
1705 |
return __cfqg_set_weight_device(of, buf, nbytes, off, false, true); |
e71357e11 cfq-iosched: add ... |
1706 |
} |
dd165eb3b blkcg: misc prepa... |
1707 |
static int __cfq_set_weight(struct cgroup_subsys_state *css, u64 val, |
69d7fde59 blkcg: use CGROUP... |
1708 |
bool on_dfl, bool reset_dev, bool is_leaf_weight) |
60c2bc2d5 blkcg: move conf/... |
1709 |
{ |
69d7fde59 blkcg: use CGROUP... |
1710 1711 |
unsigned int min = on_dfl ? CGROUP_WEIGHT_MIN : CFQ_WEIGHT_LEGACY_MIN; unsigned int max = on_dfl ? CGROUP_WEIGHT_MAX : CFQ_WEIGHT_LEGACY_MAX; |
182446d08 cgroup: pass arou... |
1712 |
struct blkcg *blkcg = css_to_blkcg(css); |
3c798398e blkcg: mass renam... |
1713 |
struct blkcg_gq *blkg; |
e48453c38 block, cgroup: im... |
1714 |
struct cfq_group_data *cfqgd; |
ae994ea97 cfq-iosched: fix ... |
1715 |
int ret = 0; |
60c2bc2d5 blkcg: move conf/... |
1716 |
|
69d7fde59 blkcg: use CGROUP... |
1717 1718 |
if (val < min || val > max) return -ERANGE; |
60c2bc2d5 blkcg: move conf/... |
1719 1720 |
spin_lock_irq(&blkcg->lock); |
e48453c38 block, cgroup: im... |
1721 |
cfqgd = blkcg_to_cfqgd(blkcg); |
ae994ea97 cfq-iosched: fix ... |
1722 1723 1724 1725 |
if (!cfqgd) { ret = -EINVAL; goto out; } |
e71357e11 cfq-iosched: add ... |
1726 1727 |
if (!is_leaf_weight) |
e48453c38 block, cgroup: im... |
1728 |
cfqgd->weight = val; |
e71357e11 cfq-iosched: add ... |
1729 |
else |
e48453c38 block, cgroup: im... |
1730 |
cfqgd->leaf_weight = val; |
60c2bc2d5 blkcg: move conf/... |
1731 |
|
b67bfe0d4 hlist: drop the n... |
1732 |
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { |
3381cb8d2 blkcg: move blkio... |
1733 |
struct cfq_group *cfqg = blkg_to_cfqg(blkg); |
60c2bc2d5 blkcg: move conf/... |
1734 |
|
e71357e11 cfq-iosched: add ... |
1735 1736 1737 1738 |
if (!cfqg) continue; if (!is_leaf_weight) { |
69d7fde59 blkcg: use CGROUP... |
1739 1740 |
if (reset_dev) cfqg->dev_weight = 0; |
e71357e11 cfq-iosched: add ... |
1741 |
if (!cfqg->dev_weight) |
e48453c38 block, cgroup: im... |
1742 |
cfqg->new_weight = cfqgd->weight; |
e71357e11 cfq-iosched: add ... |
1743 |
} else { |
69d7fde59 blkcg: use CGROUP... |
1744 1745 |
if (reset_dev) cfqg->dev_leaf_weight = 0; |
e71357e11 cfq-iosched: add ... |
1746 |
if (!cfqg->dev_leaf_weight) |
e48453c38 block, cgroup: im... |
1747 |
cfqg->new_leaf_weight = cfqgd->leaf_weight; |
e71357e11 cfq-iosched: add ... |
1748 |
} |
60c2bc2d5 blkcg: move conf/... |
1749 |
} |
ae994ea97 cfq-iosched: fix ... |
1750 |
out: |
60c2bc2d5 blkcg: move conf/... |
1751 |
spin_unlock_irq(&blkcg->lock); |
ae994ea97 cfq-iosched: fix ... |
1752 |
return ret; |
60c2bc2d5 blkcg: move conf/... |
1753 |
} |
182446d08 cgroup: pass arou... |
1754 1755 |
static int cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft, u64 val) |
e71357e11 cfq-iosched: add ... |
1756 |
{ |
69d7fde59 blkcg: use CGROUP... |
1757 |
return __cfq_set_weight(css, val, false, false, false); |
e71357e11 cfq-iosched: add ... |
1758 |
} |
182446d08 cgroup: pass arou... |
1759 1760 |
static int cfq_set_leaf_weight(struct cgroup_subsys_state *css, struct cftype *cft, u64 val) |
e71357e11 cfq-iosched: add ... |
1761 |
{ |
69d7fde59 blkcg: use CGROUP... |
1762 |
return __cfq_set_weight(css, val, false, false, true); |
e71357e11 cfq-iosched: add ... |
1763 |
} |
2da8ca822 cgroup: replace c... |
1764 |
static int cfqg_print_stat(struct seq_file *sf, void *v) |
5bc4afb1e blkcg: drop BLKCG... |
1765 |
{ |
2da8ca822 cgroup: replace c... |
1766 1767 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat, &blkcg_policy_cfq, seq_cft(sf)->private, false); |
5bc4afb1e blkcg: drop BLKCG... |
1768 1769 |
return 0; } |
2da8ca822 cgroup: replace c... |
1770 |
static int cfqg_print_rwstat(struct seq_file *sf, void *v) |
5bc4afb1e blkcg: drop BLKCG... |
1771 |
{ |
2da8ca822 cgroup: replace c... |
1772 1773 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, &blkcg_policy_cfq, seq_cft(sf)->private, true); |
5bc4afb1e blkcg: drop BLKCG... |
1774 1775 |
return 0; } |
43114018c cfq-iosched: add ... |
1776 1777 1778 |
static u64 cfqg_prfill_stat_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
f12c74cab blkcg: make blkg_... |
1779 1780 |
u64 sum = blkg_stat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_cfq, off); |
43114018c cfq-iosched: add ... |
1781 1782 1783 1784 1785 1786 |
return __blkg_prfill_u64(sf, pd, sum); } static u64 cfqg_prfill_rwstat_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
f12c74cab blkcg: make blkg_... |
1787 1788 |
struct blkg_rwstat sum = blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_cfq, off); |
43114018c cfq-iosched: add ... |
1789 1790 |
return __blkg_prfill_rwstat(sf, pd, &sum); } |
2da8ca822 cgroup: replace c... |
1791 |
static int cfqg_print_stat_recursive(struct seq_file *sf, void *v) |
43114018c cfq-iosched: add ... |
1792 |
{ |
2da8ca822 cgroup: replace c... |
1793 1794 1795 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_stat_recursive, &blkcg_policy_cfq, seq_cft(sf)->private, false); |
43114018c cfq-iosched: add ... |
1796 1797 |
return 0; } |
2da8ca822 cgroup: replace c... |
1798 |
static int cfqg_print_rwstat_recursive(struct seq_file *sf, void *v) |
43114018c cfq-iosched: add ... |
1799 |
{ |
2da8ca822 cgroup: replace c... |
1800 1801 1802 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_rwstat_recursive, &blkcg_policy_cfq, seq_cft(sf)->private, true); |
43114018c cfq-iosched: add ... |
1803 1804 |
return 0; } |
702747cab blkcg: remove cfq... |
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 |
static u64 cfqg_prfill_sectors(struct seq_file *sf, struct blkg_policy_data *pd, int off) { u64 sum = blkg_rwstat_total(&pd->blkg->stat_bytes); return __blkg_prfill_u64(sf, pd, sum >> 9); } static int cfqg_print_stat_sectors(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_sectors, &blkcg_policy_cfq, 0, false); return 0; } static u64 cfqg_prfill_sectors_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { struct blkg_rwstat tmp = blkg_rwstat_recursive_sum(pd->blkg, NULL, offsetof(struct blkcg_gq, stat_bytes)); u64 sum = atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_READ]) + atomic64_read(&tmp.aux_cnt[BLKG_RWSTAT_WRITE]); return __blkg_prfill_u64(sf, pd, sum >> 9); } static int cfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v) { blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_sectors_recursive, &blkcg_policy_cfq, 0, false); return 0; } |
60c2bc2d5 blkcg: move conf/... |
1838 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
f95a04afa blkcg: embed stru... |
1839 1840 |
static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
60c2bc2d5 blkcg: move conf/... |
1841 |
{ |
f95a04afa blkcg: embed stru... |
1842 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
155fead9b blkcg: move blkio... |
1843 |
u64 samples = blkg_stat_read(&cfqg->stats.avg_queue_size_samples); |
60c2bc2d5 blkcg: move conf/... |
1844 1845 1846 |
u64 v = 0; if (samples) { |
155fead9b blkcg: move blkio... |
1847 |
v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum); |
f3cff25f0 cfq: explicitly u... |
1848 |
v = div64_u64(v, samples); |
60c2bc2d5 blkcg: move conf/... |
1849 |
} |
f95a04afa blkcg: embed stru... |
1850 |
__blkg_prfill_u64(sf, pd, v); |
60c2bc2d5 blkcg: move conf/... |
1851 1852 1853 1854 |
return 0; } /* print avg_queue_size */ |
2da8ca822 cgroup: replace c... |
1855 |
static int cfqg_print_avg_queue_size(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1856 |
{ |
2da8ca822 cgroup: replace c... |
1857 1858 1859 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_avg_queue_size, &blkcg_policy_cfq, 0, false); |
60c2bc2d5 blkcg: move conf/... |
1860 1861 1862 |
return 0; } #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
880f50e22 blkcg: mark exist... |
1863 |
static struct cftype cfq_blkcg_legacy_files[] = { |
1d3650f71 cfq-iosched: impl... |
1864 |
/* on root, weight is mapped to leaf_weight */ |
60c2bc2d5 blkcg: move conf/... |
1865 1866 |
{ .name = "weight_device", |
1d3650f71 cfq-iosched: impl... |
1867 |
.flags = CFTYPE_ONLY_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1868 |
.seq_show = cfqg_print_leaf_weight_device, |
451af504d cgroup: replace c... |
1869 |
.write = cfqg_set_leaf_weight_device, |
60c2bc2d5 blkcg: move conf/... |
1870 1871 1872 |
}, { .name = "weight", |
1d3650f71 cfq-iosched: impl... |
1873 |
.flags = CFTYPE_ONLY_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1874 |
.seq_show = cfq_print_leaf_weight, |
1d3650f71 cfq-iosched: impl... |
1875 |
.write_u64 = cfq_set_leaf_weight, |
60c2bc2d5 blkcg: move conf/... |
1876 |
}, |
e71357e11 cfq-iosched: add ... |
1877 |
|
1d3650f71 cfq-iosched: impl... |
1878 |
/* no such mapping necessary for !roots */ |
60c2bc2d5 blkcg: move conf/... |
1879 1880 |
{ .name = "weight_device", |
1d3650f71 cfq-iosched: impl... |
1881 |
.flags = CFTYPE_NOT_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1882 |
.seq_show = cfqg_print_weight_device, |
451af504d cgroup: replace c... |
1883 |
.write = cfqg_set_weight_device, |
60c2bc2d5 blkcg: move conf/... |
1884 1885 1886 |
}, { .name = "weight", |
1d3650f71 cfq-iosched: impl... |
1887 |
.flags = CFTYPE_NOT_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1888 |
.seq_show = cfq_print_weight, |
3381cb8d2 blkcg: move blkio... |
1889 |
.write_u64 = cfq_set_weight, |
60c2bc2d5 blkcg: move conf/... |
1890 |
}, |
e71357e11 cfq-iosched: add ... |
1891 |
|
e71357e11 cfq-iosched: add ... |
1892 1893 |
{ .name = "leaf_weight_device", |
2da8ca822 cgroup: replace c... |
1894 |
.seq_show = cfqg_print_leaf_weight_device, |
451af504d cgroup: replace c... |
1895 |
.write = cfqg_set_leaf_weight_device, |
e71357e11 cfq-iosched: add ... |
1896 1897 1898 |
}, { .name = "leaf_weight", |
2da8ca822 cgroup: replace c... |
1899 |
.seq_show = cfq_print_leaf_weight, |
e71357e11 cfq-iosched: add ... |
1900 1901 |
.write_u64 = cfq_set_leaf_weight, }, |
43114018c cfq-iosched: add ... |
1902 |
/* statistics, covers only the tasks in the cfqg */ |
60c2bc2d5 blkcg: move conf/... |
1903 1904 |
{ .name = "time", |
5bc4afb1e blkcg: drop BLKCG... |
1905 |
.private = offsetof(struct cfq_group, stats.time), |
2da8ca822 cgroup: replace c... |
1906 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
1907 1908 1909 |
}, { .name = "sectors", |
702747cab blkcg: remove cfq... |
1910 |
.seq_show = cfqg_print_stat_sectors, |
60c2bc2d5 blkcg: move conf/... |
1911 1912 1913 |
}, { .name = "io_service_bytes", |
77ea73388 blkcg: move io_se... |
1914 1915 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_bytes, |
60c2bc2d5 blkcg: move conf/... |
1916 1917 1918 |
}, { .name = "io_serviced", |
77ea73388 blkcg: move io_se... |
1919 1920 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_ios, |
60c2bc2d5 blkcg: move conf/... |
1921 1922 1923 |
}, { .name = "io_service_time", |
5bc4afb1e blkcg: drop BLKCG... |
1924 |
.private = offsetof(struct cfq_group, stats.service_time), |
2da8ca822 cgroup: replace c... |
1925 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1926 1927 1928 |
}, { .name = "io_wait_time", |
5bc4afb1e blkcg: drop BLKCG... |
1929 |
.private = offsetof(struct cfq_group, stats.wait_time), |
2da8ca822 cgroup: replace c... |
1930 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1931 1932 1933 |
}, { .name = "io_merged", |
5bc4afb1e blkcg: drop BLKCG... |
1934 |
.private = offsetof(struct cfq_group, stats.merged), |
2da8ca822 cgroup: replace c... |
1935 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1936 1937 1938 |
}, { .name = "io_queued", |
5bc4afb1e blkcg: drop BLKCG... |
1939 |
.private = offsetof(struct cfq_group, stats.queued), |
2da8ca822 cgroup: replace c... |
1940 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1941 |
}, |
43114018c cfq-iosched: add ... |
1942 1943 1944 1945 1946 |
/* the same statictics which cover the cfqg and its descendants */ { .name = "time_recursive", .private = offsetof(struct cfq_group, stats.time), |
2da8ca822 cgroup: replace c... |
1947 |
.seq_show = cfqg_print_stat_recursive, |
43114018c cfq-iosched: add ... |
1948 1949 1950 |
}, { .name = "sectors_recursive", |
702747cab blkcg: remove cfq... |
1951 |
.seq_show = cfqg_print_stat_sectors_recursive, |
43114018c cfq-iosched: add ... |
1952 1953 1954 |
}, { .name = "io_service_bytes_recursive", |
77ea73388 blkcg: move io_se... |
1955 1956 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_bytes_recursive, |
43114018c cfq-iosched: add ... |
1957 1958 1959 |
}, { .name = "io_serviced_recursive", |
77ea73388 blkcg: move io_se... |
1960 1961 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_ios_recursive, |
43114018c cfq-iosched: add ... |
1962 1963 1964 1965 |
}, { .name = "io_service_time_recursive", .private = offsetof(struct cfq_group, stats.service_time), |
2da8ca822 cgroup: replace c... |
1966 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
1967 1968 1969 1970 |
}, { .name = "io_wait_time_recursive", .private = offsetof(struct cfq_group, stats.wait_time), |
2da8ca822 cgroup: replace c... |
1971 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
1972 1973 1974 1975 |
}, { .name = "io_merged_recursive", .private = offsetof(struct cfq_group, stats.merged), |
2da8ca822 cgroup: replace c... |
1976 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
1977 1978 1979 1980 |
}, { .name = "io_queued_recursive", .private = offsetof(struct cfq_group, stats.queued), |
2da8ca822 cgroup: replace c... |
1981 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
1982 |
}, |
60c2bc2d5 blkcg: move conf/... |
1983 1984 1985 |
#ifdef CONFIG_DEBUG_BLK_CGROUP { .name = "avg_queue_size", |
2da8ca822 cgroup: replace c... |
1986 |
.seq_show = cfqg_print_avg_queue_size, |
60c2bc2d5 blkcg: move conf/... |
1987 1988 1989 |
}, { .name = "group_wait_time", |
5bc4afb1e blkcg: drop BLKCG... |
1990 |
.private = offsetof(struct cfq_group, stats.group_wait_time), |
2da8ca822 cgroup: replace c... |
1991 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
1992 1993 1994 |
}, { .name = "idle_time", |
5bc4afb1e blkcg: drop BLKCG... |
1995 |
.private = offsetof(struct cfq_group, stats.idle_time), |
2da8ca822 cgroup: replace c... |
1996 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
1997 1998 1999 |
}, { .name = "empty_time", |
5bc4afb1e blkcg: drop BLKCG... |
2000 |
.private = offsetof(struct cfq_group, stats.empty_time), |
2da8ca822 cgroup: replace c... |
2001 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2002 2003 2004 |
}, { .name = "dequeue", |
5bc4afb1e blkcg: drop BLKCG... |
2005 |
.private = offsetof(struct cfq_group, stats.dequeue), |
2da8ca822 cgroup: replace c... |
2006 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2007 2008 2009 |
}, { .name = "unaccounted_time", |
5bc4afb1e blkcg: drop BLKCG... |
2010 |
.private = offsetof(struct cfq_group, stats.unaccounted_time), |
2da8ca822 cgroup: replace c... |
2011 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2012 2013 2014 2015 |
}, #endif /* CONFIG_DEBUG_BLK_CGROUP */ { } /* terminate */ }; |
2ee867dcf blkcg: implement ... |
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 |
static int cfq_print_weight_on_dfl(struct seq_file *sf, void *v) { struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg); seq_printf(sf, "default %u ", cgd->weight); blkcg_print_blkgs(sf, blkcg, cfqg_prfill_weight_device, &blkcg_policy_cfq, 0, false); return 0; } static ssize_t cfq_set_weight_on_dfl(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { char *endp; int ret; u64 v; buf = strim(buf); /* "WEIGHT" or "default WEIGHT" sets the default weight */ v = simple_strtoull(buf, &endp, 0); if (*endp == '\0' || sscanf(buf, "default %llu", &v) == 1) { |
69d7fde59 blkcg: use CGROUP... |
2041 |
ret = __cfq_set_weight(of_css(of), v, true, false, false); |
2ee867dcf blkcg: implement ... |
2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 |
return ret ?: nbytes; } /* "MAJ:MIN WEIGHT" */ return __cfqg_set_weight_device(of, buf, nbytes, off, true, false); } static struct cftype cfq_blkcg_files[] = { { .name = "weight", .flags = CFTYPE_NOT_ON_ROOT, .seq_show = cfq_print_weight_on_dfl, .write = cfq_set_weight_on_dfl, }, { } /* terminate */ }; |
25fb5169d blkio: Dynamic cf... |
2058 |
#else /* GROUP_IOSCHED */ |
ae1188963 blkcg: consolidat... |
2059 2060 |
static struct cfq_group *cfq_lookup_cfqg(struct cfq_data *cfqd, struct blkcg *blkcg) |
25fb5169d blkio: Dynamic cf... |
2061 |
{ |
f51b802c1 blkcg: use the us... |
2062 |
return cfqd->root_group; |
25fb5169d blkio: Dynamic cf... |
2063 |
} |
7f1dc8a2d blkio: Fix blkio ... |
2064 |
|
25fb5169d blkio: Dynamic cf... |
2065 2066 2067 2068 2069 2070 |
static inline void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { cfqq->cfqg = cfqg; } #endif /* GROUP_IOSCHED */ |
498d3aa2b [PATCH] cfq-iosch... |
2071 |
/* |
c0324a020 cfq-iosched: reim... |
2072 |
* The cfqd->service_trees holds all pending cfq_queue's that have |
498d3aa2b [PATCH] cfq-iosch... |
2073 2074 2075 |
* requests waiting to be processed. It is sorted in the order that * we will service the queues. */ |
a36e71f99 cfq-iosched: add ... |
2076 |
static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
2077 |
bool add_front) |
d9e7620e6 cfq-iosched: rewo... |
2078 |
{ |
0871714e0 cfq-iosched: rela... |
2079 2080 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
9a7f38c42 cfq-iosched: Conv... |
2081 |
u64 rb_key; |
34b98d03b cfq-iosched: Rena... |
2082 |
struct cfq_rb_root *st; |
09663c86e block/cfq: replac... |
2083 |
bool leftmost = true; |
dae739ebc blkio: Group time... |
2084 |
int new_cfqq = 1; |
9a7f38c42 cfq-iosched: Conv... |
2085 |
u64 now = ktime_get_ns(); |
ae30c2865 blkio: Implement ... |
2086 |
|
34b98d03b cfq-iosched: Rena... |
2087 |
st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq)); |
0871714e0 cfq-iosched: rela... |
2088 2089 |
if (cfq_class_idle(cfqq)) { rb_key = CFQ_IDLE_DELAY; |
f0f1a45f9 block/cfq: cache ... |
2090 |
parent = st->rb_rightmost; |
0871714e0 cfq-iosched: rela... |
2091 2092 2093 2094 |
if (parent && parent != &cfqq->rb_node) { __cfqq = rb_entry(parent, struct cfq_queue, rb_node); rb_key += __cfqq->rb_key; } else |
9a7f38c42 cfq-iosched: Conv... |
2095 |
rb_key += now; |
0871714e0 cfq-iosched: rela... |
2096 |
} else if (!add_front) { |
b9c8946b1 cfq-iosched: fix ... |
2097 2098 2099 2100 2101 2102 |
/* * Get our rb key offset. Subtract any residual slice * value carried from last service. A negative resid * count indicates slice overrun, and this should position * the next service time further away in the tree. */ |
9a7f38c42 cfq-iosched: Conv... |
2103 |
rb_key = cfq_slice_offset(cfqd, cfqq) + now; |
b9c8946b1 cfq-iosched: fix ... |
2104 |
rb_key -= cfqq->slice_resid; |
edd75ffd9 cfq-iosched: get ... |
2105 |
cfqq->slice_resid = 0; |
48e025e63 cfq-iosched: fix ... |
2106 |
} else { |
9a7f38c42 cfq-iosched: Conv... |
2107 |
rb_key = -NSEC_PER_SEC; |
34b98d03b cfq-iosched: Rena... |
2108 |
__cfqq = cfq_rb_first(st); |
9a7f38c42 cfq-iosched: Conv... |
2109 |
rb_key += __cfqq ? __cfqq->rb_key : now; |
48e025e63 cfq-iosched: fix ... |
2110 |
} |
1da177e4c Linux-2.6.12-rc2 |
2111 |
|
d9e7620e6 cfq-iosched: rewo... |
2112 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
dae739ebc blkio: Group time... |
2113 |
new_cfqq = 0; |
99f9628ab [PATCH] cfq-iosch... |
2114 |
/* |
d9e7620e6 cfq-iosched: rewo... |
2115 |
* same position, nothing more to do |
99f9628ab [PATCH] cfq-iosch... |
2116 |
*/ |
34b98d03b cfq-iosched: Rena... |
2117 |
if (rb_key == cfqq->rb_key && cfqq->service_tree == st) |
d9e7620e6 cfq-iosched: rewo... |
2118 |
return; |
1da177e4c Linux-2.6.12-rc2 |
2119 |
|
aa6f6a3de cfq-iosched: prep... |
2120 2121 |
cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2122 |
} |
d9e7620e6 cfq-iosched: rewo... |
2123 |
|
0871714e0 cfq-iosched: rela... |
2124 |
parent = NULL; |
34b98d03b cfq-iosched: Rena... |
2125 |
cfqq->service_tree = st; |
09663c86e block/cfq: replac... |
2126 |
p = &st->rb.rb_root.rb_node; |
d9e7620e6 cfq-iosched: rewo... |
2127 2128 2129 |
while (*p) { parent = *p; __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
0c534e0a4 cfq-iosched: sort... |
2130 |
/* |
c0324a020 cfq-iosched: reim... |
2131 |
* sort by key, that represents service time. |
0c534e0a4 cfq-iosched: sort... |
2132 |
*/ |
9a7f38c42 cfq-iosched: Conv... |
2133 |
if (rb_key < __cfqq->rb_key) |
1f23f1215 cfq-iosched: Get ... |
2134 |
p = &parent->rb_left; |
c0324a020 cfq-iosched: reim... |
2135 |
else { |
1f23f1215 cfq-iosched: Get ... |
2136 |
p = &parent->rb_right; |
09663c86e block/cfq: replac... |
2137 |
leftmost = false; |
c0324a020 cfq-iosched: reim... |
2138 |
} |
d9e7620e6 cfq-iosched: rewo... |
2139 2140 2141 2142 |
} cfqq->rb_key = rb_key; rb_link_node(&cfqq->rb_node, parent, p); |
09663c86e block/cfq: replac... |
2143 |
rb_insert_color_cached(&cfqq->rb_node, &st->rb, leftmost); |
34b98d03b cfq-iosched: Rena... |
2144 |
st->count++; |
20359f27e cfq-iosched: remo... |
2145 |
if (add_front || !new_cfqq) |
dae739ebc blkio: Group time... |
2146 |
return; |
8184f93ec cfq-iosched: Don'... |
2147 |
cfq_group_notify_queue_add(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2148 |
} |
a36e71f99 cfq-iosched: add ... |
2149 |
static struct cfq_queue * |
f2d1f0ae7 cfq-iosched: cach... |
2150 2151 2152 |
cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root, sector_t sector, struct rb_node **ret_parent, struct rb_node ***rb_link) |
a36e71f99 cfq-iosched: add ... |
2153 |
{ |
a36e71f99 cfq-iosched: add ... |
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 |
struct rb_node **p, *parent; struct cfq_queue *cfqq = NULL; parent = NULL; p = &root->rb_node; while (*p) { struct rb_node **n; parent = *p; cfqq = rb_entry(parent, struct cfq_queue, p_node); /* * Sort strictly based on sector. Smallest to the left, * largest to the right. */ |
2e46e8b27 block: drop reque... |
2169 |
if (sector > blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2170 |
n = &(*p)->rb_right; |
2e46e8b27 block: drop reque... |
2171 |
else if (sector < blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2172 2173 2174 2175 |
n = &(*p)->rb_left; else break; p = n; |
3ac6c9f8a cfq-iosched: fix ... |
2176 |
cfqq = NULL; |
a36e71f99 cfq-iosched: add ... |
2177 2178 2179 2180 2181 |
} *ret_parent = parent; if (rb_link) *rb_link = p; |
3ac6c9f8a cfq-iosched: fix ... |
2182 |
return cfqq; |
a36e71f99 cfq-iosched: add ... |
2183 2184 2185 2186 |
} static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
a36e71f99 cfq-iosched: add ... |
2187 2188 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
f2d1f0ae7 cfq-iosched: cach... |
2189 2190 2191 2192 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
a36e71f99 cfq-iosched: add ... |
2193 2194 2195 2196 2197 |
if (cfq_class_idle(cfqq)) return; if (!cfqq->next_rq) return; |
f2d1f0ae7 cfq-iosched: cach... |
2198 |
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; |
2e46e8b27 block: drop reque... |
2199 2200 |
__cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, blk_rq_pos(cfqq->next_rq), &parent, &p); |
3ac6c9f8a cfq-iosched: fix ... |
2201 2202 |
if (!__cfqq) { rb_link_node(&cfqq->p_node, parent, p); |
f2d1f0ae7 cfq-iosched: cach... |
2203 2204 2205 |
rb_insert_color(&cfqq->p_node, cfqq->p_root); } else cfqq->p_root = NULL; |
a36e71f99 cfq-iosched: add ... |
2206 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2207 2208 2209 |
/* * Update cfqq's position in the service tree. */ |
edd75ffd9 cfq-iosched: get ... |
2210 |
static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
2211 |
{ |
6d048f531 cfq-iosched: deve... |
2212 2213 2214 |
/* * Resorting requires the cfqq to be on the RR list already. */ |
a36e71f99 cfq-iosched: add ... |
2215 |
if (cfq_cfqq_on_rr(cfqq)) { |
edd75ffd9 cfq-iosched: get ... |
2216 |
cfq_service_tree_add(cfqd, cfqq, 0); |
a36e71f99 cfq-iosched: add ... |
2217 2218 |
cfq_prio_tree_add(cfqd, cfqq); } |
6d048f531 cfq-iosched: deve... |
2219 |
} |
1da177e4c Linux-2.6.12-rc2 |
2220 2221 |
/* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
2222 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
2223 |
*/ |
febffd618 cfq-iosched: kill... |
2224 |
static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2225 |
{ |
7b679138b cfq-iosched: add ... |
2226 |
cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
2227 2228 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2229 |
cfqd->busy_queues++; |
ef8a41df8 cfq-iosched: give... |
2230 2231 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues++; |
1da177e4c Linux-2.6.12-rc2 |
2232 |
|
edd75ffd9 cfq-iosched: get ... |
2233 |
cfq_resort_rr_list(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2234 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2235 2236 2237 2238 |
/* * Called when the cfqq no longer has requests pending, remove it from * the service tree. */ |
febffd618 cfq-iosched: kill... |
2239 |
static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2240 |
{ |
7b679138b cfq-iosched: add ... |
2241 |
cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
2242 2243 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2244 |
|
aa6f6a3de cfq-iosched: prep... |
2245 2246 2247 2248 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; } |
f2d1f0ae7 cfq-iosched: cach... |
2249 2250 2251 2252 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
d9e7620e6 cfq-iosched: rewo... |
2253 |
|
8184f93ec cfq-iosched: Don'... |
2254 |
cfq_group_notify_queue_del(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2255 2256 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; |
ef8a41df8 cfq-iosched: give... |
2257 2258 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues--; |
1da177e4c Linux-2.6.12-rc2 |
2259 2260 2261 2262 2263 |
} /* * rb tree support functions */ |
febffd618 cfq-iosched: kill... |
2264 |
static void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2265 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2266 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
5e7053747 [PATCH] cfq-iosch... |
2267 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
2268 |
|
b4878f245 [PATCH] 02/05: up... |
2269 2270 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
2271 |
|
5e7053747 [PATCH] cfq-iosch... |
2272 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
2273 |
|
f04a64246 blkio: Keep queue... |
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) { /* * Queue will be deleted from service tree when we actually * expire it later. Right now just remove it from prio tree * as it is empty. */ if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } } |
1da177e4c Linux-2.6.12-rc2 |
2285 |
} |
5e7053747 [PATCH] cfq-iosch... |
2286 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2287 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2288 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
2289 |
struct cfq_data *cfqd = cfqq->cfqd; |
796d5116c iosched: prevent ... |
2290 |
struct request *prev; |
1da177e4c Linux-2.6.12-rc2 |
2291 |
|
5380a101d [PATCH] cfq-iosch... |
2292 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
2293 |
|
796d5116c iosched: prevent ... |
2294 |
elv_rb_add(&cfqq->sort_list, rq); |
5fccbf61b [PATCH] CFQ: requ... |
2295 2296 2297 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
2298 2299 2300 2301 |
/* * check if this request is a better next-serve candidate */ |
a36e71f99 cfq-iosched: add ... |
2302 |
prev = cfqq->next_rq; |
cf7c25cf9 cfq-iosched: fix ... |
2303 |
cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq, cfqd->last_position); |
a36e71f99 cfq-iosched: add ... |
2304 2305 2306 2307 2308 2309 |
/* * adjust priority tree position, if ->next_rq changes */ if (prev != cfqq->next_rq) cfq_prio_tree_add(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
2310 |
BUG_ON(!cfqq->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
2311 |
} |
febffd618 cfq-iosched: kill... |
2312 |
static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2313 |
{ |
5380a101d [PATCH] cfq-iosch... |
2314 2315 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
ef295ecf0 block: better op ... |
2316 |
cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags); |
5e7053747 [PATCH] cfq-iosch... |
2317 |
cfq_add_rq_rb(rq); |
155fead9b blkcg: move blkio... |
2318 |
cfqg_stats_update_io_add(RQ_CFQG(rq), cfqq->cfqd->serving_group, |
ef295ecf0 block: better op ... |
2319 |
rq->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
2320 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
2321 2322 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2323 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
2324 |
struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
2325 |
struct cfq_io_cq *cic; |
206dc69b3 [BLOCK] cfq-iosch... |
2326 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
2327 |
|
4ac845a2e block: cfq: make ... |
2328 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
2329 2330 |
if (!cic) return NULL; |
aa39ebd40 cfq-iosched: use ... |
2331 |
cfqq = cic_to_cfqq(cic, op_is_sync(bio->bi_opf)); |
f73a1c7d1 block: Add bio_en... |
2332 2333 |
if (cfqq) return elv_rb_find(&cfqq->sort_list, bio_end_sector(bio)); |
1da177e4c Linux-2.6.12-rc2 |
2334 |
|
1da177e4c Linux-2.6.12-rc2 |
2335 2336 |
return NULL; } |
165125e1e [BLOCK] Get rid o... |
2337 |
static void cfq_activate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2338 |
{ |
22e2c507c [PATCH] Update cf... |
2339 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
2340 |
|
53c583d22 cfq-iosched: requ... |
2341 |
cfqd->rq_in_driver++; |
7b679138b cfq-iosched: add ... |
2342 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
2343 |
cfqd->rq_in_driver); |
25776e359 [PATCH] cfq-iosch... |
2344 |
|
5b93629b4 block: implement ... |
2345 |
cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
2346 |
} |
165125e1e [BLOCK] Get rid o... |
2347 |
static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2348 |
{ |
b4878f245 [PATCH] 02/05: up... |
2349 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
53c583d22 cfq-iosched: requ... |
2350 2351 |
WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
7b679138b cfq-iosched: add ... |
2352 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
2353 |
cfqd->rq_in_driver); |
1da177e4c Linux-2.6.12-rc2 |
2354 |
} |
b4878f245 [PATCH] 02/05: up... |
2355 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2356 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2357 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
2358 |
|
5e7053747 [PATCH] cfq-iosch... |
2359 2360 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
2361 |
|
b4878f245 [PATCH] 02/05: up... |
2362 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
2363 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
2364 |
|
45333d5a3 cfq-iosched: fix ... |
2365 |
cfqq->cfqd->rq_queued--; |
ef295ecf0 block: better op ... |
2366 |
cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags); |
65299a3b7 block: separate p... |
2367 2368 2369 |
if (rq->cmd_flags & REQ_PRIO) { WARN_ON(!cfqq->prio_pending); cfqq->prio_pending--; |
b53d1ed73 Revert "cfq: Remo... |
2370 |
} |
1da177e4c Linux-2.6.12-rc2 |
2371 |
} |
34fe7c054 block: enumify EL... |
2372 |
static enum elv_merge cfq_merge(struct request_queue *q, struct request **req, |
165125e1e [BLOCK] Get rid o... |
2373 |
struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2374 2375 2376 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
2377 |
|
206dc69b3 [BLOCK] cfq-iosch... |
2378 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
72ef799b3 block: do not mer... |
2379 |
if (__rq && elv_bio_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
2380 2381 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
2382 2383 2384 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
2385 |
} |
165125e1e [BLOCK] Get rid o... |
2386 |
static void cfq_merged_request(struct request_queue *q, struct request *req, |
34fe7c054 block: enumify EL... |
2387 |
enum elv_merge type) |
1da177e4c Linux-2.6.12-rc2 |
2388 |
{ |
21183b07e [PATCH] cfq-iosch... |
2389 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
2390 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
2391 |
|
5e7053747 [PATCH] cfq-iosch... |
2392 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
2393 |
} |
1da177e4c Linux-2.6.12-rc2 |
2394 |
} |
812d40264 blkio: Add io_mer... |
2395 2396 2397 |
static void cfq_bio_merged(struct request_queue *q, struct request *req, struct bio *bio) { |
ef295ecf0 block: better op ... |
2398 |
cfqg_stats_update_io_merged(RQ_CFQG(req), bio->bi_opf); |
812d40264 blkio: Add io_mer... |
2399 |
} |
1da177e4c Linux-2.6.12-rc2 |
2400 |
static void |
165125e1e [BLOCK] Get rid o... |
2401 |
cfq_merged_requests(struct request_queue *q, struct request *rq, |
1da177e4c Linux-2.6.12-rc2 |
2402 2403 |
struct request *next) { |
cf7c25cf9 cfq-iosched: fix ... |
2404 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
4a0b75c7d block, cfq: fix e... |
2405 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
22e2c507c [PATCH] Update cf... |
2406 2407 2408 2409 |
/* * reposition in fifo if next is older than rq */ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && |
9a7f38c42 cfq-iosched: Conv... |
2410 |
next->fifo_time < rq->fifo_time && |
3d106fba2 block CFQ: avoid ... |
2411 |
cfqq == RQ_CFQQ(next)) { |
22e2c507c [PATCH] Update cf... |
2412 |
list_move(&rq->queuelist, &next->queuelist); |
8b4922d31 block: Stop abusi... |
2413 |
rq->fifo_time = next->fifo_time; |
30996f40b cfq-iosched: fix ... |
2414 |
} |
22e2c507c [PATCH] Update cf... |
2415 |
|
cf7c25cf9 cfq-iosched: fix ... |
2416 2417 |
if (cfqq->next_rq == next) cfqq->next_rq = rq; |
b4878f245 [PATCH] 02/05: up... |
2418 |
cfq_remove_request(next); |
ef295ecf0 block: better op ... |
2419 |
cfqg_stats_update_io_merged(RQ_CFQG(rq), next->cmd_flags); |
4a0b75c7d block, cfq: fix e... |
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 |
cfqq = RQ_CFQQ(next); /* * all requests of this queue are merged to other queues, delete it * from the service tree. If it's the active_queue, * cfq_dispatch_requests() will choose to expire it or do idle */ if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list) && cfqq != cfqd->active_queue) cfq_del_cfqq_rr(cfqd, cfqq); |
22e2c507c [PATCH] Update cf... |
2430 |
} |
72ef799b3 block: do not mer... |
2431 2432 |
static int cfq_allow_bio_merge(struct request_queue *q, struct request *rq, struct bio *bio) |
da7752650 [PATCH] cfq-iosch... |
2433 2434 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
aa39ebd40 cfq-iosched: use ... |
2435 |
bool is_sync = op_is_sync(bio->bi_opf); |
c58698073 block, cfq: reorg... |
2436 |
struct cfq_io_cq *cic; |
da7752650 [PATCH] cfq-iosch... |
2437 |
struct cfq_queue *cfqq; |
da7752650 [PATCH] cfq-iosch... |
2438 2439 |
/* |
ec8acb690 [PATCH] cfq-iosch... |
2440 |
* Disallow merge of a sync bio into an async request. |
da7752650 [PATCH] cfq-iosch... |
2441 |
*/ |
aa39ebd40 cfq-iosched: use ... |
2442 |
if (is_sync && !rq_is_sync(rq)) |
a6151c3a5 cfq-iosched: appl... |
2443 |
return false; |
da7752650 [PATCH] cfq-iosch... |
2444 2445 |
/* |
f1a4f4d35 block, cfq: fix c... |
2446 |
* Lookup the cfqq that this bio will be queued with and allow |
07c2bd373 block: don't call... |
2447 |
* merge only if rq is queued there. |
f1a4f4d35 block, cfq: fix c... |
2448 |
*/ |
07c2bd373 block: don't call... |
2449 2450 2451 |
cic = cfq_cic_lookup(cfqd, current->io_context); if (!cic) return false; |
719d34027 [PATCH] cfq-iosch... |
2452 |
|
aa39ebd40 cfq-iosched: use ... |
2453 |
cfqq = cic_to_cfqq(cic, is_sync); |
a6151c3a5 cfq-iosched: appl... |
2454 |
return cfqq == RQ_CFQQ(rq); |
da7752650 [PATCH] cfq-iosch... |
2455 |
} |
72ef799b3 block: do not mer... |
2456 2457 2458 2459 2460 |
static int cfq_allow_rq_merge(struct request_queue *q, struct request *rq, struct request *next) { return RQ_CFQQ(rq) == RQ_CFQQ(next); } |
812df48d1 blkio: Add more d... |
2461 2462 |
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
911483258 cfq-iosched: Conv... |
2463 |
hrtimer_try_to_cancel(&cfqd->idle_slice_timer); |
155fead9b blkcg: move blkio... |
2464 |
cfqg_stats_update_idle_time(cfqq->cfqg); |
812df48d1 blkio: Add more d... |
2465 |
} |
febffd618 cfq-iosched: kill... |
2466 2467 |
static void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
2468 2469 |
{ if (cfqq) { |
3bf10fea3 cfq-iosched: Prop... |
2470 |
cfq_log_cfqq(cfqd, cfqq, "set_active wl_class:%d wl_type:%d", |
4d2ceea4c cfq-iosched: More... |
2471 |
cfqd->serving_wl_class, cfqd->serving_wl_type); |
155fead9b blkcg: move blkio... |
2472 |
cfqg_stats_update_avg_queue_size(cfqq->cfqg); |
62a37f6ba cfq-iosched: Don'... |
2473 |
cfqq->slice_start = 0; |
9a7f38c42 cfq-iosched: Conv... |
2474 |
cfqq->dispatch_start = ktime_get_ns(); |
62a37f6ba cfq-iosched: Don'... |
2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 |
cfqq->allocated_slice = 0; cfqq->slice_end = 0; cfqq->slice_dispatch = 0; cfqq->nr_sectors = 0; cfq_clear_cfqq_wait_request(cfqq); cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); cfq_mark_cfqq_slice_new(cfqq); cfq_del_timer(cfqd, cfqq); |
22e2c507c [PATCH] Update cf... |
2487 2488 2489 2490 2491 2492 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
2493 2494 2495 2496 |
* current cfqq expired its slice (or was too idle), select new one */ static void __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e5ff082e8 blkio: Fix anothe... |
2497 |
bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
2498 |
{ |
7b679138b cfq-iosched: add ... |
2499 |
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
2500 |
if (cfq_cfqq_wait_request(cfqq)) |
812df48d1 blkio: Add more d... |
2501 |
cfq_del_timer(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2502 |
|
7b14e3b52 [PATCH] cfq-iosch... |
2503 |
cfq_clear_cfqq_wait_request(cfqq); |
f75edf2dc blkio: Wait for c... |
2504 |
cfq_clear_cfqq_wait_busy(cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2505 2506 |
/* |
ae54abed6 cfq-iosched: spli... |
2507 2508 2509 2510 2511 2512 2513 2514 2515 |
* If this cfqq is shared between multiple processes, check to * make sure that those processes are still issuing I/Os within * the mean seek distance. If not, it may be time to break the * queues apart again. */ if (cfq_cfqq_coop(cfqq) && CFQQ_SEEKY(cfqq)) cfq_mark_cfqq_split_coop(cfqq); /* |
6084cdda0 cfq-iosched: don'... |
2516 |
* store what was left of this slice, if the queue idled/timed out |
7b14e3b52 [PATCH] cfq-iosch... |
2517 |
*/ |
c553f8e33 block cfq: compen... |
2518 2519 |
if (timed_out) { if (cfq_cfqq_slice_new(cfqq)) |
ba5bd520f cfq: rename a fun... |
2520 |
cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
2521 |
else |
9a7f38c42 cfq-iosched: Conv... |
2522 |
cfqq->slice_resid = cfqq->slice_end - ktime_get_ns(); |
93fdf1478 cfq-iosched: Conv... |
2523 |
cfq_log_cfqq(cfqd, cfqq, "resid=%lld", cfqq->slice_resid); |
7b679138b cfq-iosched: add ... |
2524 |
} |
7b14e3b52 [PATCH] cfq-iosch... |
2525 |
|
e5ff082e8 blkio: Fix anothe... |
2526 |
cfq_group_served(cfqd, cfqq->cfqg, cfqq); |
dae739ebc blkio: Group time... |
2527 |
|
f04a64246 blkio: Keep queue... |
2528 2529 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) cfq_del_cfqq_rr(cfqd, cfqq); |
edd75ffd9 cfq-iosched: get ... |
2530 |
cfq_resort_rr_list(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2531 2532 2533 2534 2535 |
if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { |
11a3122f6 block: strip out ... |
2536 |
put_io_context(cfqd->active_cic->icq.ioc); |
7b14e3b52 [PATCH] cfq-iosch... |
2537 2538 |
cfqd->active_cic = NULL; } |
7b14e3b52 [PATCH] cfq-iosch... |
2539 |
} |
e5ff082e8 blkio: Fix anothe... |
2540 |
static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
2541 2542 2543 2544 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) |
e5ff082e8 blkio: Fix anothe... |
2545 |
__cfq_slice_expired(cfqd, cfqq, timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
2546 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2547 2548 2549 2550 |
/* * Get next queue for service. Unless we have a queue preemption, * we'll simply select the first cfqq in the service tree. */ |
6d048f531 cfq-iosched: deve... |
2551 |
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
2552 |
{ |
34b98d03b cfq-iosched: Rena... |
2553 2554 |
struct cfq_rb_root *st = st_for(cfqd->serving_group, cfqd->serving_wl_class, cfqd->serving_wl_type); |
d9e7620e6 cfq-iosched: rewo... |
2555 |
|
f04a64246 blkio: Keep queue... |
2556 2557 |
if (!cfqd->rq_queued) return NULL; |
1fa8f6d68 blkio: Introduce ... |
2558 |
/* There is nothing to dispatch */ |
34b98d03b cfq-iosched: Rena... |
2559 |
if (!st) |
1fa8f6d68 blkio: Introduce ... |
2560 |
return NULL; |
09663c86e block/cfq: replac... |
2561 |
if (RB_EMPTY_ROOT(&st->rb.rb_root)) |
c0324a020 cfq-iosched: reim... |
2562 |
return NULL; |
34b98d03b cfq-iosched: Rena... |
2563 |
return cfq_rb_first(st); |
6d048f531 cfq-iosched: deve... |
2564 |
} |
f04a64246 blkio: Keep queue... |
2565 2566 |
static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) { |
25fb5169d blkio: Dynamic cf... |
2567 |
struct cfq_group *cfqg; |
f04a64246 blkio: Keep queue... |
2568 2569 2570 2571 2572 2573 |
struct cfq_queue *cfqq; int i, j; struct cfq_rb_root *st; if (!cfqd->rq_queued) return NULL; |
25fb5169d blkio: Dynamic cf... |
2574 2575 2576 |
cfqg = cfq_get_next_cfqg(cfqd); if (!cfqg) return NULL; |
1cf417530 cfq-iosched: Adju... |
2577 2578 2579 |
for_each_cfqg_st(cfqg, i, j, st) { cfqq = cfq_rb_first(st); if (cfqq) |
f04a64246 blkio: Keep queue... |
2580 |
return cfqq; |
1cf417530 cfq-iosched: Adju... |
2581 |
} |
f04a64246 blkio: Keep queue... |
2582 2583 |
return NULL; } |
498d3aa2b [PATCH] cfq-iosch... |
2584 2585 2586 |
/* * Get and set a new active queue for service. */ |
a36e71f99 cfq-iosched: add ... |
2587 2588 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
2589 |
{ |
e00ef7997 cfq-iosched: get ... |
2590 |
if (!cfqq) |
a36e71f99 cfq-iosched: add ... |
2591 |
cfqq = cfq_get_next_queue(cfqd); |
6d048f531 cfq-iosched: deve... |
2592 |
|
22e2c507c [PATCH] Update cf... |
2593 |
__cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
2594 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
2595 |
} |
d9e7620e6 cfq-iosched: rewo... |
2596 2597 2598 |
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, struct request *rq) { |
83096ebf1 block: convert to... |
2599 2600 |
if (blk_rq_pos(rq) >= cfqd->last_position) return blk_rq_pos(rq) - cfqd->last_position; |
d9e7620e6 cfq-iosched: rewo... |
2601 |
else |
83096ebf1 block: convert to... |
2602 |
return cfqd->last_position - blk_rq_pos(rq); |
d9e7620e6 cfq-iosched: rewo... |
2603 |
} |
b2c18e1e0 cfq: calculate th... |
2604 |
static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e9ce335df cfq-iosched: fix ... |
2605 |
struct request *rq) |
6d048f531 cfq-iosched: deve... |
2606 |
{ |
e9ce335df cfq-iosched: fix ... |
2607 |
return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR; |
6d048f531 cfq-iosched: deve... |
2608 |
} |
a36e71f99 cfq-iosched: add ... |
2609 2610 2611 |
static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, struct cfq_queue *cur_cfqq) { |
f2d1f0ae7 cfq-iosched: cach... |
2612 |
struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; |
a36e71f99 cfq-iosched: add ... |
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 |
struct rb_node *parent, *node; struct cfq_queue *__cfqq; sector_t sector = cfqd->last_position; if (RB_EMPTY_ROOT(root)) return NULL; /* * First, if we find a request starting at the end of the last * request, choose it. */ |
f2d1f0ae7 cfq-iosched: cach... |
2624 |
__cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); |
a36e71f99 cfq-iosched: add ... |
2625 2626 2627 2628 2629 2630 2631 2632 |
if (__cfqq) return __cfqq; /* * If the exact sector wasn't found, the parent of the NULL leaf * will contain the closest sector. */ __cfqq = rb_entry(parent, struct cfq_queue, p_node); |
e9ce335df cfq-iosched: fix ... |
2633 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2634 |
return __cfqq; |
2e46e8b27 block: drop reque... |
2635 |
if (blk_rq_pos(__cfqq->next_rq) < sector) |
a36e71f99 cfq-iosched: add ... |
2636 2637 2638 2639 2640 2641 2642 |
node = rb_next(&__cfqq->p_node); else node = rb_prev(&__cfqq->p_node); if (!node) return NULL; __cfqq = rb_entry(node, struct cfq_queue, p_node); |
e9ce335df cfq-iosched: fix ... |
2643 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 |
return __cfqq; return NULL; } /* * cfqd - obvious * cur_cfqq - passed in so that we don't decide that the current queue is * closely cooperating with itself. * * So, basically we're assuming that that cur_cfqq has dispatched at least * one request, and that cfqd->last_position reflects a position on the disk * associated with the I/O issued by cur_cfqq. I'm not sure this is a valid * assumption. */ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd, |
b3b6d0408 cfq: change the m... |
2660 |
struct cfq_queue *cur_cfqq) |
6d048f531 cfq-iosched: deve... |
2661 |
{ |
a36e71f99 cfq-iosched: add ... |
2662 |
struct cfq_queue *cfqq; |
39c01b219 cfq-iosched: Do n... |
2663 2664 |
if (cfq_class_idle(cur_cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
2665 2666 2667 2668 |
if (!cfq_cfqq_sync(cur_cfqq)) return NULL; if (CFQQ_SEEKY(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
2669 |
/* |
b9d8f4c73 cfq: Optimization... |
2670 2671 2672 2673 2674 2675 |
* Don't search priority tree if it's the only queue in the group. */ if (cur_cfqq->cfqg->nr_cfqq == 1) return NULL; /* |
d9e7620e6 cfq-iosched: rewo... |
2676 2677 2678 |
* We should notice if some of the queues are cooperating, eg * working closely on the same area of the disk. In that case, * we can group them together and don't waste time idling. |
6d048f531 cfq-iosched: deve... |
2679 |
*/ |
a36e71f99 cfq-iosched: add ... |
2680 2681 2682 |
cfqq = cfqq_close(cfqd, cur_cfqq); if (!cfqq) return NULL; |
8682e1f15 blkio: Provide so... |
2683 2684 2685 |
/* If new queue belongs to different cfq_group, don't choose it */ if (cur_cfqq->cfqg != cfqq->cfqg) return NULL; |
df5fe3e8e cfq: merge cooper... |
2686 2687 2688 2689 2690 |
/* * It only makes sense to merge sync queues. */ if (!cfq_cfqq_sync(cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
2691 2692 |
if (CFQQ_SEEKY(cfqq)) return NULL; |
df5fe3e8e cfq: merge cooper... |
2693 |
|
c0324a020 cfq-iosched: reim... |
2694 2695 2696 2697 2698 |
/* * Do not merge queues of different priority classes */ if (cfq_class_rt(cfqq) != cfq_class_rt(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
2699 |
return cfqq; |
6d048f531 cfq-iosched: deve... |
2700 |
} |
a6d44e982 cfq-iosched: enab... |
2701 2702 2703 2704 2705 2706 |
/* * Determine whether we should enforce idle window for this queue. */ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
3bf10fea3 cfq-iosched: Prop... |
2707 |
enum wl_class_t wl_class = cfqq_class(cfqq); |
34b98d03b cfq-iosched: Rena... |
2708 |
struct cfq_rb_root *st = cfqq->service_tree; |
a6d44e982 cfq-iosched: enab... |
2709 |
|
34b98d03b cfq-iosched: Rena... |
2710 2711 |
BUG_ON(!st); BUG_ON(!st->count); |
f04a64246 blkio: Keep queue... |
2712 |
|
b6508c161 cfq-iosched: Do n... |
2713 2714 |
if (!cfqd->cfq_slice_idle) return false; |
a6d44e982 cfq-iosched: enab... |
2715 |
/* We never do for idle class queues. */ |
3bf10fea3 cfq-iosched: Prop... |
2716 |
if (wl_class == IDLE_WORKLOAD) |
a6d44e982 cfq-iosched: enab... |
2717 2718 2719 |
return false; /* We do for queues that were marked with idle window flag. */ |
3c764b7a6 cfq-iosched: make... |
2720 2721 |
if (cfq_cfqq_idle_window(cfqq) && !(blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)) |
a6d44e982 cfq-iosched: enab... |
2722 2723 2724 2725 2726 2727 |
return true; /* * Otherwise, we do only if they are the last ones * in their service tree. */ |
34b98d03b cfq-iosched: Rena... |
2728 2729 |
if (st->count == 1 && cfq_cfqq_sync(cfqq) && !cfq_io_thinktime_big(cfqd, &st->ttime, false)) |
c1e44756f cfq-iosched: do c... |
2730 |
return true; |
34b98d03b cfq-iosched: Rena... |
2731 |
cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", st->count); |
c1e44756f cfq-iosched: do c... |
2732 |
return false; |
a6d44e982 cfq-iosched: enab... |
2733 |
} |
6d048f531 cfq-iosched: deve... |
2734 |
static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
2735 |
{ |
1792669cc cfq-iosched: don'... |
2736 |
struct cfq_queue *cfqq = cfqd->active_queue; |
e795421e4 cfq-iosched: Don'... |
2737 |
struct cfq_rb_root *st = cfqq->service_tree; |
c58698073 block, cfq: reorg... |
2738 |
struct cfq_io_cq *cic; |
9a7f38c42 cfq-iosched: Conv... |
2739 2740 |
u64 sl, group_idle = 0; u64 now = ktime_get_ns(); |
7b14e3b52 [PATCH] cfq-iosch... |
2741 |
|
a68bbddba block: add queue ... |
2742 |
/* |
f7d7b7a7a block: as/cfq ssd... |
2743 2744 2745 |
* SSD device without seek penalty, disable idling. But only do so * for devices that support queuing, otherwise we still have a problem * with sync vs async workloads. |
a68bbddba block: add queue ... |
2746 |
*/ |
b3193bc0d cfq: Give a chanc... |
2747 2748 |
if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag && !cfqd->cfq_group_idle) |
a68bbddba block: add queue ... |
2749 |
return; |
dd67d0515 [PATCH] rbtree: s... |
2750 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
6d048f531 cfq-iosched: deve... |
2751 |
WARN_ON(cfq_cfqq_slice_new(cfqq)); |
22e2c507c [PATCH] Update cf... |
2752 2753 2754 2755 |
/* * idle is disabled, either manually or by past process history */ |
80bdf0c78 cfq-iosched: Impl... |
2756 2757 2758 2759 2760 2761 2762 |
if (!cfq_should_idle(cfqd, cfqq)) { /* no queue idling. Check for group idling */ if (cfqd->cfq_group_idle) group_idle = cfqd->cfq_group_idle; else return; } |
6d048f531 cfq-iosched: deve... |
2763 |
|
22e2c507c [PATCH] Update cf... |
2764 |
/* |
8e550632c cfq-iosched: fix ... |
2765 |
* still active requests from this queue, don't idle |
7b679138b cfq-iosched: add ... |
2766 |
*/ |
8e550632c cfq-iosched: fix ... |
2767 |
if (cfqq->dispatched) |
7b679138b cfq-iosched: add ... |
2768 2769 2770 |
return; /* |
22e2c507c [PATCH] Update cf... |
2771 2772 |
* task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
2773 |
cic = cfqd->active_cic; |
f6e8d01be block: add io_con... |
2774 |
if (!cic || !atomic_read(&cic->icq.ioc->active_ref)) |
6d048f531 cfq-iosched: deve... |
2775 |
return; |
355b659c8 cfq-iosched: avoi... |
2776 2777 2778 2779 2780 |
/* * If our average think time is larger than the remaining time * slice, then don't idle. This avoids overrunning the allotted * time slice. */ |
383cd7213 CFQ: move think t... |
2781 |
if (sample_valid(cic->ttime.ttime_samples) && |
9a7f38c42 cfq-iosched: Conv... |
2782 2783 |
(cfqq->slice_end - now < cic->ttime.ttime_mean)) { cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%llu", |
383cd7213 CFQ: move think t... |
2784 |
cic->ttime.ttime_mean); |
355b659c8 cfq-iosched: avoi... |
2785 |
return; |
b1ffe737f cfq-iosched: Add ... |
2786 |
} |
355b659c8 cfq-iosched: avoi... |
2787 |
|
e795421e4 cfq-iosched: Don'... |
2788 2789 2790 2791 2792 2793 2794 |
/* * There are other queues in the group or this is the only group and * it has too big thinktime, don't do group idle. */ if (group_idle && (cfqq->cfqg->nr_cfqq > 1 || cfq_io_thinktime_big(cfqd, &st->ttime, true))) |
80bdf0c78 cfq-iosched: Impl... |
2795 |
return; |
3b18152c3 [PATCH] CFQ io sc... |
2796 |
cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
2797 |
|
80bdf0c78 cfq-iosched: Impl... |
2798 2799 2800 2801 |
if (group_idle) sl = cfqd->cfq_group_idle; else sl = cfqd->cfq_slice_idle; |
206dc69b3 [BLOCK] cfq-iosch... |
2802 |
|
911483258 cfq-iosched: Conv... |
2803 2804 |
hrtimer_start(&cfqd->idle_slice_timer, ns_to_ktime(sl), HRTIMER_MODE_REL); |
155fead9b blkcg: move blkio... |
2805 |
cfqg_stats_set_start_idle_time(cfqq->cfqg); |
9a7f38c42 cfq-iosched: Conv... |
2806 |
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %llu group_idle: %d", sl, |
80bdf0c78 cfq-iosched: Impl... |
2807 |
group_idle ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
2808 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2809 2810 2811 |
/* * Move request from internal lists to the request queue dispatch list. */ |
165125e1e [BLOCK] Get rid o... |
2812 |
static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2813 |
{ |
3ed9a2965 cfq-iosched: impr... |
2814 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
2815 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
2816 |
|
7b679138b cfq-iosched: add ... |
2817 |
cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); |
06d218864 cfq: choose a new... |
2818 |
cfqq->next_rq = cfq_find_next_rq(cfqd, cfqq, rq); |
5380a101d [PATCH] cfq-iosch... |
2819 |
cfq_remove_request(rq); |
6d048f531 cfq-iosched: deve... |
2820 |
cfqq->dispatched++; |
80bdf0c78 cfq-iosched: Impl... |
2821 |
(RQ_CFQG(rq))->dispatched++; |
5380a101d [PATCH] cfq-iosch... |
2822 |
elv_dispatch_sort(q, rq); |
3ed9a2965 cfq-iosched: impr... |
2823 |
|
53c583d22 cfq-iosched: requ... |
2824 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++; |
c4e7893eb cfq-iosched: blkt... |
2825 |
cfqq->nr_sectors += blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
2826 2827 2828 2829 2830 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
febffd618 cfq-iosched: kill... |
2831 |
static struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2832 |
{ |
30996f40b cfq-iosched: fix ... |
2833 |
struct request *rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2834 |
|
3b18152c3 [PATCH] CFQ io sc... |
2835 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
2836 |
return NULL; |
cb8874119 cfq-iosched: twea... |
2837 2838 |
cfq_mark_cfqq_fifo_expire(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
2839 2840 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2841 |
|
89850f7ee [PATCH] cfq-iosch... |
2842 |
rq = rq_entry_fifo(cfqq->fifo.next); |
9a7f38c42 cfq-iosched: Conv... |
2843 |
if (ktime_get_ns() < rq->fifo_time) |
7b679138b cfq-iosched: add ... |
2844 |
rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2845 |
|
6d048f531 cfq-iosched: deve... |
2846 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
2847 |
} |
22e2c507c [PATCH] Update cf... |
2848 2849 2850 2851 |
static inline int cfq_prio_to_maxrq(struct cfq_data *cfqd, struct cfq_queue *cfqq) { const int base_rq = cfqd->cfq_slice_async_rq; |
1da177e4c Linux-2.6.12-rc2 |
2852 |
|
22e2c507c [PATCH] Update cf... |
2853 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
2854 |
|
b9f8ce059 cfq-iosched: alge... |
2855 |
return 2 * base_rq * (IOPRIO_BE_NR - cfqq->ioprio); |
1da177e4c Linux-2.6.12-rc2 |
2856 |
} |
22e2c507c [PATCH] Update cf... |
2857 |
/* |
df5fe3e8e cfq: merge cooper... |
2858 2859 2860 2861 2862 2863 2864 |
* Must be called with the queue_lock held. */ static int cfqq_process_refs(struct cfq_queue *cfqq) { int process_refs, io_refs; io_refs = cfqq->allocated[READ] + cfqq->allocated[WRITE]; |
30d7b9448 block cfq: don't ... |
2865 |
process_refs = cfqq->ref - io_refs; |
df5fe3e8e cfq: merge cooper... |
2866 2867 2868 2869 2870 2871 |
BUG_ON(process_refs < 0); return process_refs; } static void cfq_setup_merge(struct cfq_queue *cfqq, struct cfq_queue *new_cfqq) { |
e6c5bc737 cfq: break apart ... |
2872 |
int process_refs, new_process_refs; |
df5fe3e8e cfq: merge cooper... |
2873 |
struct cfq_queue *__cfqq; |
c10b61f09 cfq: Don't allow ... |
2874 2875 2876 2877 2878 2879 2880 2881 |
/* * If there are no process references on the new_cfqq, then it is * unsafe to follow the ->new_cfqq chain as other cfqq's in the * chain may have dropped their last reference (not just their * last process reference). */ if (!cfqq_process_refs(new_cfqq)) return; |
df5fe3e8e cfq: merge cooper... |
2882 2883 2884 2885 2886 2887 2888 2889 |
/* Avoid a circular list and skip interim queue merges */ while ((__cfqq = new_cfqq->new_cfqq)) { if (__cfqq == cfqq) return; new_cfqq = __cfqq; } process_refs = cfqq_process_refs(cfqq); |
c10b61f09 cfq: Don't allow ... |
2890 |
new_process_refs = cfqq_process_refs(new_cfqq); |
df5fe3e8e cfq: merge cooper... |
2891 2892 2893 2894 |
/* * If the process for the cfqq has gone away, there is no * sense in merging the queues. */ |
c10b61f09 cfq: Don't allow ... |
2895 |
if (process_refs == 0 || new_process_refs == 0) |
df5fe3e8e cfq: merge cooper... |
2896 |
return; |
e6c5bc737 cfq: break apart ... |
2897 2898 2899 |
/* * Merge in the direction of the lesser amount of work. */ |
e6c5bc737 cfq: break apart ... |
2900 2901 |
if (new_process_refs >= process_refs) { cfqq->new_cfqq = new_cfqq; |
30d7b9448 block cfq: don't ... |
2902 |
new_cfqq->ref += process_refs; |
e6c5bc737 cfq: break apart ... |
2903 2904 |
} else { new_cfqq->new_cfqq = cfqq; |
30d7b9448 block cfq: don't ... |
2905 |
cfqq->ref += new_process_refs; |
e6c5bc737 cfq: break apart ... |
2906 |
} |
df5fe3e8e cfq: merge cooper... |
2907 |
} |
6d816ec7c cfq-iosched: Rena... |
2908 |
static enum wl_type_t cfq_choose_wl_type(struct cfq_data *cfqd, |
3bf10fea3 cfq-iosched: Prop... |
2909 |
struct cfq_group *cfqg, enum wl_class_t wl_class) |
718eee057 cfq-iosched: fair... |
2910 2911 2912 2913 |
{ struct cfq_queue *queue; int i; bool key_valid = false; |
9a7f38c42 cfq-iosched: Conv... |
2914 |
u64 lowest_key = 0; |
718eee057 cfq-iosched: fair... |
2915 |
enum wl_type_t cur_best = SYNC_NOIDLE_WORKLOAD; |
65b32a573 cfq-iosched: Remo... |
2916 2917 |
for (i = 0; i <= SYNC_WORKLOAD; ++i) { /* select the one with lowest rb_key */ |
34b98d03b cfq-iosched: Rena... |
2918 |
queue = cfq_rb_first(st_for(cfqg, wl_class, i)); |
718eee057 cfq-iosched: fair... |
2919 |
if (queue && |
9a7f38c42 cfq-iosched: Conv... |
2920 |
(!key_valid || queue->rb_key < lowest_key)) { |
718eee057 cfq-iosched: fair... |
2921 2922 2923 2924 2925 2926 2927 2928 |
lowest_key = queue->rb_key; cur_best = i; key_valid = true; } } return cur_best; } |
6d816ec7c cfq-iosched: Rena... |
2929 2930 |
static void choose_wl_class_and_type(struct cfq_data *cfqd, struct cfq_group *cfqg) |
718eee057 cfq-iosched: fair... |
2931 |
{ |
9a7f38c42 cfq-iosched: Conv... |
2932 |
u64 slice; |
718eee057 cfq-iosched: fair... |
2933 |
unsigned count; |
cdb16e8f7 blkio: Introduce ... |
2934 |
struct cfq_rb_root *st; |
9a7f38c42 cfq-iosched: Conv... |
2935 |
u64 group_slice; |
4d2ceea4c cfq-iosched: More... |
2936 |
enum wl_class_t original_class = cfqd->serving_wl_class; |
9a7f38c42 cfq-iosched: Conv... |
2937 |
u64 now = ktime_get_ns(); |
1fa8f6d68 blkio: Introduce ... |
2938 |
|
718eee057 cfq-iosched: fair... |
2939 |
/* Choose next priority. RT > BE > IDLE */ |
58ff82f34 blkio: Implement ... |
2940 |
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg)) |
4d2ceea4c cfq-iosched: More... |
2941 |
cfqd->serving_wl_class = RT_WORKLOAD; |
58ff82f34 blkio: Implement ... |
2942 |
else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg)) |
4d2ceea4c cfq-iosched: More... |
2943 |
cfqd->serving_wl_class = BE_WORKLOAD; |
718eee057 cfq-iosched: fair... |
2944 |
else { |
4d2ceea4c cfq-iosched: More... |
2945 |
cfqd->serving_wl_class = IDLE_WORKLOAD; |
9a7f38c42 cfq-iosched: Conv... |
2946 |
cfqd->workload_expires = now + jiffies_to_nsecs(1); |
718eee057 cfq-iosched: fair... |
2947 2948 |
return; } |
4d2ceea4c cfq-iosched: More... |
2949 |
if (original_class != cfqd->serving_wl_class) |
e4ea0c16a block cfq: select... |
2950 |
goto new_workload; |
718eee057 cfq-iosched: fair... |
2951 2952 2953 2954 2955 |
/* * For RT and BE, we have to choose also the type * (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload * expiration time */ |
34b98d03b cfq-iosched: Rena... |
2956 |
st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
cdb16e8f7 blkio: Introduce ... |
2957 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2958 2959 |
/* |
65b32a573 cfq-iosched: Remo... |
2960 |
* check workload expiration, and that we still have other queues ready |
718eee057 cfq-iosched: fair... |
2961 |
*/ |
9a7f38c42 cfq-iosched: Conv... |
2962 |
if (count && !(now > cfqd->workload_expires)) |
718eee057 cfq-iosched: fair... |
2963 |
return; |
e4ea0c16a block cfq: select... |
2964 |
new_workload: |
718eee057 cfq-iosched: fair... |
2965 |
/* otherwise select new workload type */ |
6d816ec7c cfq-iosched: Rena... |
2966 |
cfqd->serving_wl_type = cfq_choose_wl_type(cfqd, cfqg, |
4d2ceea4c cfq-iosched: More... |
2967 |
cfqd->serving_wl_class); |
34b98d03b cfq-iosched: Rena... |
2968 |
st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
cdb16e8f7 blkio: Introduce ... |
2969 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2970 2971 2972 2973 2974 2975 |
/* * the workload slice is computed as a fraction of target latency * proportional to the number of queues in that workload, over * all the queues in the same priority class */ |
58ff82f34 blkio: Implement ... |
2976 |
group_slice = cfq_group_slice(cfqd, cfqg); |
9a7f38c42 cfq-iosched: Conv... |
2977 |
slice = div_u64(group_slice * count, |
4d2ceea4c cfq-iosched: More... |
2978 2979 |
max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_wl_class], cfq_group_busy_queues_wl(cfqd->serving_wl_class, cfqd, |
9a7f38c42 cfq-iosched: Conv... |
2980 |
cfqg))); |
718eee057 cfq-iosched: fair... |
2981 |
|
4d2ceea4c cfq-iosched: More... |
2982 |
if (cfqd->serving_wl_type == ASYNC_WORKLOAD) { |
9a7f38c42 cfq-iosched: Conv... |
2983 |
u64 tmp; |
f26bd1f0a blkio: Determine ... |
2984 2985 2986 2987 2988 2989 2990 2991 |
/* * Async queues are currently system wide. Just taking * proportion of queues with-in same group will lead to higher * async ratio system wide as generally root group is going * to have higher weight. A more accurate thing would be to * calculate system wide asnc/sync ratio. */ |
5bf14c072 block: Make cfq_t... |
2992 2993 |
tmp = cfqd->cfq_target_latency * cfqg_busy_async_queues(cfqd, cfqg); |
9a7f38c42 cfq-iosched: Conv... |
2994 2995 |
tmp = div_u64(tmp, cfqd->busy_queues); slice = min_t(u64, slice, tmp); |
f26bd1f0a blkio: Determine ... |
2996 |
|
718eee057 cfq-iosched: fair... |
2997 2998 |
/* async workload slice is scaled down according to * the sync/async slice ratio. */ |
9a7f38c42 cfq-iosched: Conv... |
2999 |
slice = div64_u64(slice*cfqd->cfq_slice[0], cfqd->cfq_slice[1]); |
f26bd1f0a blkio: Determine ... |
3000 |
} else |
718eee057 cfq-iosched: fair... |
3001 3002 |
/* sync workload slice is at least 2 * cfq_slice_idle */ slice = max(slice, 2 * cfqd->cfq_slice_idle); |
9a7f38c42 cfq-iosched: Conv... |
3003 3004 3005 |
slice = max_t(u64, slice, CFQ_MIN_TT); cfq_log(cfqd, "workload slice:%llu", slice); cfqd->workload_expires = now + slice; |
718eee057 cfq-iosched: fair... |
3006 |
} |
1fa8f6d68 blkio: Introduce ... |
3007 3008 3009 |
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd) { struct cfq_rb_root *st = &cfqd->grp_service_tree; |
25bc6b077 blkio: Introduce ... |
3010 |
struct cfq_group *cfqg; |
1fa8f6d68 blkio: Introduce ... |
3011 |
|
09663c86e block/cfq: replac... |
3012 |
if (RB_EMPTY_ROOT(&st->rb.rb_root)) |
1fa8f6d68 blkio: Introduce ... |
3013 |
return NULL; |
25bc6b077 blkio: Introduce ... |
3014 |
cfqg = cfq_rb_first_group(st); |
25bc6b077 blkio: Introduce ... |
3015 3016 |
update_min_vdisktime(st); return cfqg; |
1fa8f6d68 blkio: Introduce ... |
3017 |
} |
cdb16e8f7 blkio: Introduce ... |
3018 3019 |
static void cfq_choose_cfqg(struct cfq_data *cfqd) { |
1fa8f6d68 blkio: Introduce ... |
3020 |
struct cfq_group *cfqg = cfq_get_next_cfqg(cfqd); |
9a7f38c42 cfq-iosched: Conv... |
3021 |
u64 now = ktime_get_ns(); |
1fa8f6d68 blkio: Introduce ... |
3022 3023 |
cfqd->serving_group = cfqg; |
dae739ebc blkio: Group time... |
3024 3025 |
/* Restore the workload type data */ |
4d2ceea4c cfq-iosched: More... |
3026 |
if (cfqg->saved_wl_slice) { |
9a7f38c42 cfq-iosched: Conv... |
3027 |
cfqd->workload_expires = now + cfqg->saved_wl_slice; |
4d2ceea4c cfq-iosched: More... |
3028 3029 |
cfqd->serving_wl_type = cfqg->saved_wl_type; cfqd->serving_wl_class = cfqg->saved_wl_class; |
66ae29197 cfq: set workload... |
3030 |
} else |
9a7f38c42 cfq-iosched: Conv... |
3031 |
cfqd->workload_expires = now - 1; |
66ae29197 cfq: set workload... |
3032 |
|
6d816ec7c cfq-iosched: Rena... |
3033 |
choose_wl_class_and_type(cfqd, cfqg); |
cdb16e8f7 blkio: Introduce ... |
3034 |
} |
df5fe3e8e cfq: merge cooper... |
3035 |
/* |
498d3aa2b [PATCH] cfq-iosch... |
3036 3037 |
* Select a queue for service. If we have a current active queue, * check whether to continue servicing it, or retrieve and set a new one. |
22e2c507c [PATCH] Update cf... |
3038 |
*/ |
1b5ed5e1f [BLOCK] cfq-iosch... |
3039 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
3040 |
{ |
a36e71f99 cfq-iosched: add ... |
3041 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
9a7f38c42 cfq-iosched: Conv... |
3042 |
u64 now = ktime_get_ns(); |
1da177e4c Linux-2.6.12-rc2 |
3043 |
|
22e2c507c [PATCH] Update cf... |
3044 3045 3046 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
3047 |
|
f04a64246 blkio: Keep queue... |
3048 3049 |
if (!cfqd->rq_queued) return NULL; |
c244bb50a cfq-iosched: Get ... |
3050 3051 3052 3053 3054 3055 |
/* * We were waiting for group to get backlogged. Expire the queue */ if (cfq_cfqq_wait_busy(cfqq) && !RB_EMPTY_ROOT(&cfqq->sort_list)) goto expire; |
22e2c507c [PATCH] Update cf... |
3056 |
/* |
6d048f531 cfq-iosched: deve... |
3057 |
* The active queue has run out of time, expire it and select new. |
22e2c507c [PATCH] Update cf... |
3058 |
*/ |
7667aa063 cfq-iosched: Take... |
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 |
if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq)) { /* * If slice had not expired at the completion of last request * we might not have turned on wait_busy flag. Don't expire * the queue yet. Allow the group to get backlogged. * * The very fact that we have used the slice, that means we * have been idling all along on this queue and it should be * ok to wait for this request to complete. */ |
82bbbf28d Fix a CFQ crash i... |
3069 3070 3071 |
if (cfqq->cfqg->nr_cfqq == 1 && RB_EMPTY_ROOT(&cfqq->sort_list) && cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { cfqq = NULL; |
7667aa063 cfq-iosched: Take... |
3072 |
goto keep_queue; |
82bbbf28d Fix a CFQ crash i... |
3073 |
} else |
80bdf0c78 cfq-iosched: Impl... |
3074 |
goto check_group_idle; |
7667aa063 cfq-iosched: Take... |
3075 |
} |
1da177e4c Linux-2.6.12-rc2 |
3076 |
|
22e2c507c [PATCH] Update cf... |
3077 |
/* |
6d048f531 cfq-iosched: deve... |
3078 3079 |
* The active queue has requests and isn't expired, allow it to * dispatch. |
22e2c507c [PATCH] Update cf... |
3080 |
*/ |
dd67d0515 [PATCH] rbtree: s... |
3081 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
3082 |
goto keep_queue; |
6d048f531 cfq-iosched: deve... |
3083 3084 |
/* |
a36e71f99 cfq-iosched: add ... |
3085 3086 3087 |
* If another queue has a request waiting within our mean seek * distance, let it run. The expire code will check for close * cooperators and put the close queue at the front of the service |
df5fe3e8e cfq: merge cooper... |
3088 |
* tree. If possible, merge the expiring queue with the new cfqq. |
a36e71f99 cfq-iosched: add ... |
3089 |
*/ |
b3b6d0408 cfq: change the m... |
3090 |
new_cfqq = cfq_close_cooperator(cfqd, cfqq); |
df5fe3e8e cfq: merge cooper... |
3091 3092 3093 |
if (new_cfqq) { if (!cfqq->new_cfqq) cfq_setup_merge(cfqq, new_cfqq); |
a36e71f99 cfq-iosched: add ... |
3094 |
goto expire; |
df5fe3e8e cfq: merge cooper... |
3095 |
} |
a36e71f99 cfq-iosched: add ... |
3096 3097 |
/* |
6d048f531 cfq-iosched: deve... |
3098 3099 3100 3101 |
* No requests pending. If the active queue still has requests in * flight or is idling for a new request, allow either of these * conditions to happen (or time out) before selecting a new queue. */ |
911483258 cfq-iosched: Conv... |
3102 |
if (hrtimer_active(&cfqd->idle_slice_timer)) { |
80bdf0c78 cfq-iosched: Impl... |
3103 3104 3105 |
cfqq = NULL; goto keep_queue; } |
8e1ac6655 cfq-iosched: don'... |
3106 3107 3108 3109 3110 3111 |
/* * This is a deep seek queue, but the device is much faster than * the queue can deliver, don't idle **/ if (CFQQ_SEEKY(cfqq) && cfq_cfqq_idle_window(cfqq) && (cfq_cfqq_slice_new(cfqq) || |
9a7f38c42 cfq-iosched: Conv... |
3112 |
(cfqq->slice_end - now > now - cfqq->slice_start))) { |
8e1ac6655 cfq-iosched: don'... |
3113 3114 3115 |
cfq_clear_cfqq_deep(cfqq); cfq_clear_cfqq_idle_window(cfqq); } |
80bdf0c78 cfq-iosched: Impl... |
3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 |
if (cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) { cfqq = NULL; goto keep_queue; } /* * If group idle is enabled and there are requests dispatched from * this group, wait for requests to complete. */ check_group_idle: |
7700fc4f6 CFQ: add think ti... |
3126 3127 3128 |
if (cfqd->cfq_group_idle && cfqq->cfqg->nr_cfqq == 1 && cfqq->cfqg->dispatched && !cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) { |
caaa5f9f0 [PATCH] cfq-iosch... |
3129 3130 |
cfqq = NULL; goto keep_queue; |
22e2c507c [PATCH] Update cf... |
3131 |
} |
3b18152c3 [PATCH] CFQ io sc... |
3132 |
expire: |
e5ff082e8 blkio: Fix anothe... |
3133 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
3134 |
new_queue: |
718eee057 cfq-iosched: fair... |
3135 3136 3137 3138 3139 |
/* * Current queue expired. Check if we have to switch to a new * service tree */ if (!new_cfqq) |
cdb16e8f7 blkio: Introduce ... |
3140 |
cfq_choose_cfqg(cfqd); |
718eee057 cfq-iosched: fair... |
3141 |
|
a36e71f99 cfq-iosched: add ... |
3142 |
cfqq = cfq_set_active_queue(cfqd, new_cfqq); |
22e2c507c [PATCH] Update cf... |
3143 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
3144 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
3145 |
} |
febffd618 cfq-iosched: kill... |
3146 |
static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) |
d9e7620e6 cfq-iosched: rewo... |
3147 3148 3149 3150 3151 3152 3153 3154 3155 |
{ int dispatched = 0; while (cfqq->next_rq) { cfq_dispatch_insert(cfqq->cfqd->queue, cfqq->next_rq); dispatched++; } BUG_ON(!list_empty(&cfqq->fifo)); |
f04a64246 blkio: Keep queue... |
3156 3157 |
/* By default cfqq is not expired if it is empty. Do it explicitly */ |
e5ff082e8 blkio: Fix anothe... |
3158 |
__cfq_slice_expired(cfqq->cfqd, cfqq, 0); |
d9e7620e6 cfq-iosched: rewo... |
3159 3160 |
return dispatched; } |
498d3aa2b [PATCH] cfq-iosch... |
3161 3162 3163 3164 |
/* * Drain our current requests. Used for barriers and when switching * io schedulers on-the-fly. */ |
d9e7620e6 cfq-iosched: rewo... |
3165 |
static int cfq_forced_dispatch(struct cfq_data *cfqd) |
1b5ed5e1f [BLOCK] cfq-iosch... |
3166 |
{ |
0871714e0 cfq-iosched: rela... |
3167 |
struct cfq_queue *cfqq; |
d9e7620e6 cfq-iosched: rewo... |
3168 |
int dispatched = 0; |
cdb16e8f7 blkio: Introduce ... |
3169 |
|
3440c49f5 cfq-iosched: Fix ... |
3170 |
/* Expire the timeslice of the current active queue first */ |
e5ff082e8 blkio: Fix anothe... |
3171 |
cfq_slice_expired(cfqd, 0); |
3440c49f5 cfq-iosched: Fix ... |
3172 3173 |
while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) { __cfq_set_active_queue(cfqd, cfqq); |
f04a64246 blkio: Keep queue... |
3174 |
dispatched += __cfq_forced_dispatch_cfqq(cfqq); |
3440c49f5 cfq-iosched: Fix ... |
3175 |
} |
1b5ed5e1f [BLOCK] cfq-iosch... |
3176 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
3177 |
BUG_ON(cfqd->busy_queues); |
6923715ae cfq: remove extra... |
3178 |
cfq_log(cfqd, "forced_dispatch=%d", dispatched); |
1b5ed5e1f [BLOCK] cfq-iosch... |
3179 3180 |
return dispatched; } |
abc3c744d cfq-iosched: quan... |
3181 3182 3183 |
static inline bool cfq_slice_used_soon(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
9a7f38c42 cfq-iosched: Conv... |
3184 |
u64 now = ktime_get_ns(); |
abc3c744d cfq-iosched: quan... |
3185 3186 |
/* the queue hasn't finished any request, can't estimate */ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
3187 |
return true; |
9a7f38c42 cfq-iosched: Conv... |
3188 |
if (now + cfqd->cfq_slice_idle * cfqq->dispatched > cfqq->slice_end) |
c1e44756f cfq-iosched: do c... |
3189 |
return true; |
abc3c744d cfq-iosched: quan... |
3190 |
|
c1e44756f cfq-iosched: do c... |
3191 |
return false; |
abc3c744d cfq-iosched: quan... |
3192 |
} |
0b182d617 cfq-iosched: abst... |
3193 |
static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
2f5cb7381 cfq-iosched: chan... |
3194 |
{ |
2f5cb7381 cfq-iosched: chan... |
3195 |
unsigned int max_dispatch; |
22e2c507c [PATCH] Update cf... |
3196 |
|
3932a86b4 cfq: fix starvati... |
3197 3198 |
if (cfq_cfqq_must_dispatch(cfqq)) return true; |
2f5cb7381 cfq-iosched: chan... |
3199 |
/* |
5ad531db6 cfq-iosched: drai... |
3200 3201 |
* Drain async requests before we start sync IO */ |
53c583d22 cfq-iosched: requ... |
3202 |
if (cfq_should_idle(cfqd, cfqq) && cfqd->rq_in_flight[BLK_RW_ASYNC]) |
0b182d617 cfq-iosched: abst... |
3203 |
return false; |
5ad531db6 cfq-iosched: drai... |
3204 3205 |
/* |
2f5cb7381 cfq-iosched: chan... |
3206 3207 |
* If this is an async queue and we have sync IO in flight, let it wait */ |
53c583d22 cfq-iosched: requ... |
3208 |
if (cfqd->rq_in_flight[BLK_RW_SYNC] && !cfq_cfqq_sync(cfqq)) |
0b182d617 cfq-iosched: abst... |
3209 |
return false; |
2f5cb7381 cfq-iosched: chan... |
3210 |
|
abc3c744d cfq-iosched: quan... |
3211 |
max_dispatch = max_t(unsigned int, cfqd->cfq_quantum / 2, 1); |
2f5cb7381 cfq-iosched: chan... |
3212 3213 |
if (cfq_class_idle(cfqq)) max_dispatch = 1; |
b4878f245 [PATCH] 02/05: up... |
3214 |
|
2f5cb7381 cfq-iosched: chan... |
3215 3216 3217 3218 |
/* * Does this cfqq already have too much IO in flight? */ if (cfqq->dispatched >= max_dispatch) { |
ef8a41df8 cfq-iosched: give... |
3219 |
bool promote_sync = false; |
2f5cb7381 cfq-iosched: chan... |
3220 3221 3222 |
/* * idle queue must always only have a single IO in flight */ |
3ed9a2965 cfq-iosched: impr... |
3223 |
if (cfq_class_idle(cfqq)) |
0b182d617 cfq-iosched: abst... |
3224 |
return false; |
3ed9a2965 cfq-iosched: impr... |
3225 |
|
2f5cb7381 cfq-iosched: chan... |
3226 |
/* |
c4ade94fc cfq-iosched: remo... |
3227 3228 |
* If there is only one sync queue * we can ignore async queue here and give the sync |
ef8a41df8 cfq-iosched: give... |
3229 3230 3231 3232 |
* queue no dispatch limit. The reason is a sync queue can * preempt async queue, limiting the sync queue doesn't make * sense. This is useful for aiostress test. */ |
c4ade94fc cfq-iosched: remo... |
3233 3234 |
if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) promote_sync = true; |
ef8a41df8 cfq-iosched: give... |
3235 3236 |
/* |
2f5cb7381 cfq-iosched: chan... |
3237 3238 |
* We have other queues, don't allow more IO from this one */ |
ef8a41df8 cfq-iosched: give... |
3239 3240 |
if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && !promote_sync) |
0b182d617 cfq-iosched: abst... |
3241 |
return false; |
9ede209e8 cfq-iosched: impr... |
3242 |
|
2f5cb7381 cfq-iosched: chan... |
3243 |
/* |
474b18ccc cfq-iosched: no d... |
3244 |
* Sole queue user, no limit |
365722bb9 cfq-iosched: dela... |
3245 |
*/ |
ef8a41df8 cfq-iosched: give... |
3246 |
if (cfqd->busy_queues == 1 || promote_sync) |
abc3c744d cfq-iosched: quan... |
3247 3248 3249 3250 3251 3252 3253 3254 3255 |
max_dispatch = -1; else /* * Normally we start throttling cfqq when cfq_quantum/2 * requests have been dispatched. But we can drive * deeper queue depths at the beginning of slice * subjected to upper limit of cfq_quantum. * */ max_dispatch = cfqd->cfq_quantum; |
8e2967555 cfq-iosched: impl... |
3256 3257 3258 3259 3260 3261 3262 |
} /* * Async queues must wait a bit before being allowed dispatch. * We also ramp up the dispatch depth gradually for async IO, * based on the last sync IO we serviced */ |
963b72fc6 cfq-iosched: rena... |
3263 |
if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) { |
9a7f38c42 cfq-iosched: Conv... |
3264 |
u64 last_sync = ktime_get_ns() - cfqd->last_delayed_sync; |
8e2967555 cfq-iosched: impl... |
3265 |
unsigned int depth; |
365722bb9 cfq-iosched: dela... |
3266 |
|
9a7f38c42 cfq-iosched: Conv... |
3267 |
depth = div64_u64(last_sync, cfqd->cfq_slice[1]); |
e00c54c36 cfq-iosched: don'... |
3268 3269 |
if (!depth && !cfqq->dispatched) depth = 1; |
8e2967555 cfq-iosched: impl... |
3270 3271 |
if (depth < max_dispatch) max_dispatch = depth; |
2f5cb7381 cfq-iosched: chan... |
3272 |
} |
3ed9a2965 cfq-iosched: impr... |
3273 |
|
0b182d617 cfq-iosched: abst... |
3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 |
/* * If we're below the current max, allow a dispatch */ return cfqq->dispatched < max_dispatch; } /* * Dispatch a request from cfqq, moving them to the request queue * dispatch list. */ static bool cfq_dispatch_request(struct cfq_data *cfqd, struct cfq_queue *cfqq) { struct request *rq; BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list)); |
3932a86b4 cfq: fix starvati... |
3289 3290 3291 |
rq = cfq_check_fifo(cfqq); if (rq) cfq_mark_cfqq_must_dispatch(cfqq); |
0b182d617 cfq-iosched: abst... |
3292 3293 3294 3295 3296 3297 |
if (!cfq_may_dispatch(cfqd, cfqq)) return false; /* * follow expired path, else get first next available */ |
0b182d617 cfq-iosched: abst... |
3298 3299 |
if (!rq) rq = cfqq->next_rq; |
3932a86b4 cfq: fix starvati... |
3300 3301 |
else cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq); |
0b182d617 cfq-iosched: abst... |
3302 3303 3304 3305 3306 3307 3308 |
/* * insert request into driver dispatch list */ cfq_dispatch_insert(cfqd->queue, rq); if (!cfqd->active_cic) { |
c58698073 block, cfq: reorg... |
3309 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
0b182d617 cfq-iosched: abst... |
3310 |
|
c58698073 block, cfq: reorg... |
3311 |
atomic_long_inc(&cic->icq.ioc->refcount); |
0b182d617 cfq-iosched: abst... |
3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 |
cfqd->active_cic = cic; } return true; } /* * Find the cfqq that we need to service and move a request from that to the * dispatch list */ static int cfq_dispatch_requests(struct request_queue *q, int force) { struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_queue *cfqq; if (!cfqd->busy_queues) return 0; if (unlikely(force)) return cfq_forced_dispatch(cfqd); cfqq = cfq_select_queue(cfqd); if (!cfqq) |
8e2967555 cfq-iosched: impl... |
3335 |
return 0; |
2f5cb7381 cfq-iosched: chan... |
3336 |
/* |
0b182d617 cfq-iosched: abst... |
3337 |
* Dispatch a request from this cfqq, if it is allowed |
2f5cb7381 cfq-iosched: chan... |
3338 |
*/ |
0b182d617 cfq-iosched: abst... |
3339 3340 |
if (!cfq_dispatch_request(cfqd, cfqq)) return 0; |
2f5cb7381 cfq-iosched: chan... |
3341 |
cfqq->slice_dispatch++; |
b029195dd cfq-iosched: don'... |
3342 |
cfq_clear_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
3343 |
|
2f5cb7381 cfq-iosched: chan... |
3344 3345 3346 3347 3348 3349 3350 |
/* * expire an async queue immediately if it has used up its slice. idle * queue always expire after 1 dispatch round. */ if (cfqd->busy_queues > 1 && ((!cfq_cfqq_sync(cfqq) && cfqq->slice_dispatch >= cfq_prio_to_maxrq(cfqd, cfqq)) || cfq_class_idle(cfqq))) { |
9a7f38c42 cfq-iosched: Conv... |
3351 |
cfqq->slice_end = ktime_get_ns() + 1; |
e5ff082e8 blkio: Fix anothe... |
3352 |
cfq_slice_expired(cfqd, 0); |
1da177e4c Linux-2.6.12-rc2 |
3353 |
} |
b217a903a cfq: fix the log ... |
3354 |
cfq_log_cfqq(cfqd, cfqq, "dispatched a request"); |
2f5cb7381 cfq-iosched: chan... |
3355 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
3356 |
} |
1da177e4c Linux-2.6.12-rc2 |
3357 |
/* |
5e7053747 [PATCH] cfq-iosch... |
3358 3359 |
* task holds one reference to the queue, dropped when task exits. each rq * in-flight on this queue also holds a reference, dropped when rq is freed. |
1da177e4c Linux-2.6.12-rc2 |
3360 |
* |
b1c357696 blkio: Take care ... |
3361 |
* Each cfq queue took a reference on the parent group. Drop it now. |
1da177e4c Linux-2.6.12-rc2 |
3362 3363 3364 3365 |
* queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
3366 |
struct cfq_data *cfqd = cfqq->cfqd; |
0bbfeb832 cfq-iosched: Alwa... |
3367 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
3368 |
|
30d7b9448 block cfq: don't ... |
3369 |
BUG_ON(cfqq->ref <= 0); |
1da177e4c Linux-2.6.12-rc2 |
3370 |
|
30d7b9448 block cfq: don't ... |
3371 3372 |
cfqq->ref--; if (cfqq->ref) |
1da177e4c Linux-2.6.12-rc2 |
3373 |
return; |
7b679138b cfq-iosched: add ... |
3374 |
cfq_log_cfqq(cfqd, cfqq, "put_queue"); |
1da177e4c Linux-2.6.12-rc2 |
3375 |
BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
3376 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
b1c357696 blkio: Take care ... |
3377 |
cfqg = cfqq->cfqg; |
1da177e4c Linux-2.6.12-rc2 |
3378 |
|
28f95cbc3 cfq-iosched: remo... |
3379 |
if (unlikely(cfqd->active_queue == cfqq)) { |
e5ff082e8 blkio: Fix anothe... |
3380 |
__cfq_slice_expired(cfqd, cfqq, 0); |
23e018a1b block: get rid of... |
3381 |
cfq_schedule_dispatch(cfqd); |
28f95cbc3 cfq-iosched: remo... |
3382 |
} |
22e2c507c [PATCH] Update cf... |
3383 |
|
f04a64246 blkio: Keep queue... |
3384 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
3385 |
kmem_cache_free(cfq_pool, cfqq); |
eb7d8c07f cfq: fix cfqg ref... |
3386 |
cfqg_put(cfqg); |
1da177e4c Linux-2.6.12-rc2 |
3387 |
} |
d02a2c077 cfq-iosched: fix ... |
3388 |
static void cfq_put_cooperator(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
3389 |
{ |
df5fe3e8e cfq: merge cooper... |
3390 |
struct cfq_queue *__cfqq, *next; |
df5fe3e8e cfq: merge cooper... |
3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 |
/* * If this queue was scheduled to merge with another queue, be * sure to drop the reference taken on that queue (and others in * the merge chain). See cfq_setup_merge and cfq_merge_cfqqs. */ __cfqq = cfqq->new_cfqq; while (__cfqq) { if (__cfqq == cfqq) { WARN(1, "cfqq->new_cfqq loop detected "); break; } next = __cfqq->new_cfqq; cfq_put_queue(__cfqq); __cfqq = next; } |
d02a2c077 cfq-iosched: fix ... |
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 |
} static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) { if (unlikely(cfqq == cfqd->active_queue)) { __cfq_slice_expired(cfqd, cfqq, 0); cfq_schedule_dispatch(cfqd); } cfq_put_cooperator(cfqq); |
df5fe3e8e cfq: merge cooper... |
3417 |
|
89850f7ee [PATCH] cfq-iosch... |
3418 3419 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
3420 |
|
9b84cacd0 block, cfq: restr... |
3421 3422 3423 |
static void cfq_init_icq(struct io_cq *icq) { struct cfq_io_cq *cic = icq_to_cic(icq); |
9a7f38c42 cfq-iosched: Conv... |
3424 |
cic->ttime.last_end_request = ktime_get_ns(); |
9b84cacd0 block, cfq: restr... |
3425 |
} |
c58698073 block, cfq: reorg... |
3426 |
static void cfq_exit_icq(struct io_cq *icq) |
89850f7ee [PATCH] cfq-iosch... |
3427 |
{ |
c58698073 block, cfq: reorg... |
3428 |
struct cfq_io_cq *cic = icq_to_cic(icq); |
283287a52 block, cfq: misc ... |
3429 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
4faa3c815 cfq-iosched: do n... |
3430 |
|
563180a44 cfq-iosched: mino... |
3431 3432 3433 |
if (cic_to_cfqq(cic, false)) { cfq_exit_cfqq(cfqd, cic_to_cfqq(cic, false)); cic_set_cfqq(cic, NULL, false); |
12a057321 [PATCH] keep sync... |
3434 |
} |
563180a44 cfq-iosched: mino... |
3435 3436 3437 |
if (cic_to_cfqq(cic, true)) { cfq_exit_cfqq(cfqd, cic_to_cfqq(cic, true)); cic_set_cfqq(cic, NULL, true); |
12a057321 [PATCH] keep sync... |
3438 |
} |
89850f7ee [PATCH] cfq-iosch... |
3439 |
} |
abede6da2 cfq: pass around ... |
3440 |
static void cfq_init_prio_data(struct cfq_queue *cfqq, struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
3441 3442 3443 |
{ struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
3444 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
3445 |
return; |
598971bfb cfq: don't use ic... |
3446 |
ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); |
22e2c507c [PATCH] Update cf... |
3447 |
switch (ioprio_class) { |
fe094d98e cfq-iosched: make... |
3448 3449 3450 3451 3452 |
default: printk(KERN_ERR "cfq: bad prio %x ", ioprio_class); case IOPRIO_CLASS_NONE: /* |
6d63c2755 cfq-iosched: make... |
3453 |
* no prio set, inherit CPU scheduling settings |
fe094d98e cfq-iosched: make... |
3454 3455 |
*/ cfqq->ioprio = task_nice_ioprio(tsk); |
6d63c2755 cfq-iosched: make... |
3456 |
cfqq->ioprio_class = task_nice_ioclass(tsk); |
fe094d98e cfq-iosched: make... |
3457 3458 |
break; case IOPRIO_CLASS_RT: |
598971bfb cfq: don't use ic... |
3459 |
cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
fe094d98e cfq-iosched: make... |
3460 3461 3462 |
cfqq->ioprio_class = IOPRIO_CLASS_RT; break; case IOPRIO_CLASS_BE: |
598971bfb cfq: don't use ic... |
3463 |
cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
fe094d98e cfq-iosched: make... |
3464 3465 3466 3467 3468 3469 3470 |
cfqq->ioprio_class = IOPRIO_CLASS_BE; break; case IOPRIO_CLASS_IDLE: cfqq->ioprio_class = IOPRIO_CLASS_IDLE; cfqq->ioprio = 7; cfq_clear_cfqq_idle_window(cfqq); break; |
22e2c507c [PATCH] Update cf... |
3471 3472 3473 3474 3475 3476 3477 |
} /* * keep track of original prio settings in case we have to temporarily * elevate the priority of this queue */ cfqq->org_ioprio = cfqq->ioprio; |
b8269db45 cfq-iosched: temp... |
3478 |
cfqq->org_ioprio_class = cfqq->ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
3479 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
3480 |
} |
598971bfb cfq: don't use ic... |
3481 |
static void check_ioprio_changed(struct cfq_io_cq *cic, struct bio *bio) |
22e2c507c [PATCH] Update cf... |
3482 |
{ |
598971bfb cfq: don't use ic... |
3483 |
int ioprio = cic->icq.ioc->ioprio; |
bca4b914b cfq-iosched: remo... |
3484 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
478a82b0e [PATCH] switch to... |
3485 |
struct cfq_queue *cfqq; |
35e6077cb [PATCH] cfq-iosch... |
3486 |
|
598971bfb cfq: don't use ic... |
3487 3488 3489 3490 3491 |
/* * Check whether ioprio has changed. The condition may trigger * spuriously on a newly created cic but there's no harm. */ if (unlikely(!cfqd) || likely(cic->ioprio == ioprio)) |
caaa5f9f0 [PATCH] cfq-iosch... |
3492 |
return; |
563180a44 cfq-iosched: mino... |
3493 |
cfqq = cic_to_cfqq(cic, false); |
caaa5f9f0 [PATCH] cfq-iosch... |
3494 |
if (cfqq) { |
563180a44 cfq-iosched: mino... |
3495 |
cfq_put_queue(cfqq); |
2da8de0bb cfq-iosched: remo... |
3496 |
cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic, bio); |
563180a44 cfq-iosched: mino... |
3497 |
cic_set_cfqq(cic, cfqq, false); |
22e2c507c [PATCH] Update cf... |
3498 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3499 |
|
563180a44 cfq-iosched: mino... |
3500 |
cfqq = cic_to_cfqq(cic, true); |
caaa5f9f0 [PATCH] cfq-iosch... |
3501 3502 |
if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
598971bfb cfq: don't use ic... |
3503 3504 |
cic->ioprio = ioprio; |
22e2c507c [PATCH] Update cf... |
3505 |
} |
d5036d770 cfq-iosched: move... |
3506 |
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
3507 |
pid_t pid, bool is_sync) |
d5036d770 cfq-iosched: move... |
3508 3509 3510 3511 |
{ RB_CLEAR_NODE(&cfqq->rb_node); RB_CLEAR_NODE(&cfqq->p_node); INIT_LIST_HEAD(&cfqq->fifo); |
30d7b9448 block cfq: don't ... |
3512 |
cfqq->ref = 0; |
d5036d770 cfq-iosched: move... |
3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 |
cfqq->cfqd = cfqd; cfq_mark_cfqq_prio_changed(cfqq); if (is_sync) { if (!cfq_class_idle(cfqq)) cfq_mark_cfqq_idle_window(cfqq); cfq_mark_cfqq_sync(cfqq); } cfqq->pid = pid; } |
24610333d blkio: Drop the r... |
3524 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
142bbdfcc cfq: Disable writ... |
3525 |
static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) |
24610333d blkio: Drop the r... |
3526 |
{ |
bca4b914b cfq-iosched: remo... |
3527 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
60a837077 cfq-iosched: char... |
3528 |
struct cfq_queue *cfqq; |
f4da80727 blkcg: remove blk... |
3529 |
uint64_t serial_nr; |
24610333d blkio: Drop the r... |
3530 |
|
598971bfb cfq: don't use ic... |
3531 |
rcu_read_lock(); |
f4da80727 blkcg: remove blk... |
3532 |
serial_nr = bio_blkcg(bio)->css.serial_nr; |
598971bfb cfq: don't use ic... |
3533 |
rcu_read_unlock(); |
24610333d blkio: Drop the r... |
3534 |
|
598971bfb cfq: don't use ic... |
3535 3536 3537 3538 |
/* * Check whether blkcg has changed. The condition may trigger * spuriously on a newly created cic but there's no harm. */ |
f4da80727 blkcg: remove blk... |
3539 |
if (unlikely(!cfqd) || likely(cic->blkcg_serial_nr == serial_nr)) |
142bbdfcc cfq: Disable writ... |
3540 |
return; |
87760e5ee block: hook up wr... |
3541 3542 |
/* |
60a837077 cfq-iosched: char... |
3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 |
* Drop reference to queues. New queues will be assigned in new * group upon arrival of fresh requests. */ cfqq = cic_to_cfqq(cic, false); if (cfqq) { cfq_log_cfqq(cfqd, cfqq, "changed cgroup"); cic_set_cfqq(cic, NULL, false); cfq_put_queue(cfqq); } cfqq = cic_to_cfqq(cic, true); if (cfqq) { cfq_log_cfqq(cfqd, cfqq, "changed cgroup"); cic_set_cfqq(cic, NULL, true); cfq_put_queue(cfqq); |
24610333d blkio: Drop the r... |
3558 |
} |
598971bfb cfq: don't use ic... |
3559 |
|
f4da80727 blkcg: remove blk... |
3560 |
cic->blkcg_serial_nr = serial_nr; |
24610333d blkio: Drop the r... |
3561 |
} |
598971bfb cfq: don't use ic... |
3562 |
#else |
142bbdfcc cfq: Disable writ... |
3563 |
static inline void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) |
5d7f5ce15 cfq-iosched: don'... |
3564 |
{ |
5d7f5ce15 cfq-iosched: don'... |
3565 |
} |
24610333d blkio: Drop the r... |
3566 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
c2dea2d1f cfq: async queue ... |
3567 |
static struct cfq_queue ** |
60a837077 cfq-iosched: char... |
3568 |
cfq_async_queue_prio(struct cfq_group *cfqg, int ioprio_class, int ioprio) |
c2dea2d1f cfq: async queue ... |
3569 |
{ |
fe094d98e cfq-iosched: make... |
3570 |
switch (ioprio_class) { |
c2dea2d1f cfq: async queue ... |
3571 |
case IOPRIO_CLASS_RT: |
60a837077 cfq-iosched: char... |
3572 |
return &cfqg->async_cfqq[0][ioprio]; |
598971bfb cfq: don't use ic... |
3573 3574 3575 |
case IOPRIO_CLASS_NONE: ioprio = IOPRIO_NORM; /* fall through */ |
c2dea2d1f cfq: async queue ... |
3576 |
case IOPRIO_CLASS_BE: |
60a837077 cfq-iosched: char... |
3577 |
return &cfqg->async_cfqq[1][ioprio]; |
c2dea2d1f cfq: async queue ... |
3578 |
case IOPRIO_CLASS_IDLE: |
60a837077 cfq-iosched: char... |
3579 |
return &cfqg->async_idle_cfqq; |
c2dea2d1f cfq: async queue ... |
3580 3581 3582 3583 |
default: BUG(); } } |
15c31be4d cfq-iosched: fix ... |
3584 |
static struct cfq_queue * |
abede6da2 cfq: pass around ... |
3585 |
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic, |
2da8de0bb cfq-iosched: remo... |
3586 |
struct bio *bio) |
15c31be4d cfq-iosched: fix ... |
3587 |
{ |
c6ce19432 cfq-iosched: fix ... |
3588 3589 |
int ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); int ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
d4aad7ff0 cfq-iosched: fold... |
3590 |
struct cfq_queue **async_cfqq = NULL; |
4ebc1c61d cfq-iosched: simp... |
3591 |
struct cfq_queue *cfqq; |
322731ed0 cfq-iosched: move... |
3592 3593 3594 |
struct cfq_group *cfqg; rcu_read_lock(); |
ae1188963 blkcg: consolidat... |
3595 |
cfqg = cfq_lookup_cfqg(cfqd, bio_blkcg(bio)); |
322731ed0 cfq-iosched: move... |
3596 3597 3598 3599 |
if (!cfqg) { cfqq = &cfqd->oom_cfqq; goto out; } |
15c31be4d cfq-iosched: fix ... |
3600 |
|
c2dea2d1f cfq: async queue ... |
3601 |
if (!is_sync) { |
c6ce19432 cfq-iosched: fix ... |
3602 3603 3604 3605 3606 |
if (!ioprio_valid(cic->ioprio)) { struct task_struct *tsk = current; ioprio = task_nice_ioprio(tsk); ioprio_class = task_nice_ioclass(tsk); } |
60a837077 cfq-iosched: char... |
3607 |
async_cfqq = cfq_async_queue_prio(cfqg, ioprio_class, ioprio); |
c2dea2d1f cfq: async queue ... |
3608 |
cfqq = *async_cfqq; |
4ebc1c61d cfq-iosched: simp... |
3609 3610 |
if (cfqq) goto out; |
c2dea2d1f cfq: async queue ... |
3611 |
} |
e00f4f4d0 block,blkcg: use ... |
3612 3613 |
cfqq = kmem_cache_alloc_node(cfq_pool, GFP_NOWAIT | __GFP_ZERO | __GFP_NOWARN, |
d4aad7ff0 cfq-iosched: fold... |
3614 3615 3616 3617 3618 |
cfqd->queue->node); if (!cfqq) { cfqq = &cfqd->oom_cfqq; goto out; } |
4d608baac block: Initialize... |
3619 3620 |
/* cfq_init_cfqq() assumes cfqq->ioprio_class is initialized. */ cfqq->ioprio_class = IOPRIO_CLASS_NONE; |
d4aad7ff0 cfq-iosched: fold... |
3621 3622 3623 3624 |
cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync); cfq_init_prio_data(cfqq, cic); cfq_link_cfqq_cfqg(cfqq, cfqg); cfq_log_cfqq(cfqd, cfqq, "alloced"); |
15c31be4d cfq-iosched: fix ... |
3625 |
|
d4aad7ff0 cfq-iosched: fold... |
3626 3627 |
if (async_cfqq) { /* a new async queue is created, pin and remember */ |
30d7b9448 block cfq: don't ... |
3628 |
cfqq->ref++; |
c2dea2d1f cfq: async queue ... |
3629 |
*async_cfqq = cfqq; |
15c31be4d cfq-iosched: fix ... |
3630 |
} |
4ebc1c61d cfq-iosched: simp... |
3631 |
out: |
30d7b9448 block cfq: don't ... |
3632 |
cfqq->ref++; |
322731ed0 cfq-iosched: move... |
3633 |
rcu_read_unlock(); |
15c31be4d cfq-iosched: fix ... |
3634 3635 |
return cfqq; } |
22e2c507c [PATCH] Update cf... |
3636 |
static void |
9a7f38c42 cfq-iosched: Conv... |
3637 |
__cfq_update_io_thinktime(struct cfq_ttime *ttime, u64 slice_idle) |
1da177e4c Linux-2.6.12-rc2 |
3638 |
{ |
9a7f38c42 cfq-iosched: Conv... |
3639 |
u64 elapsed = ktime_get_ns() - ttime->last_end_request; |
383cd7213 CFQ: move think t... |
3640 |
elapsed = min(elapsed, 2UL * slice_idle); |
db3b5848e When cfq I/O sche... |
3641 |
|
383cd7213 CFQ: move think t... |
3642 |
ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8; |
9a7f38c42 cfq-iosched: Conv... |
3643 3644 3645 |
ttime->ttime_total = div_u64(7*ttime->ttime_total + 256*elapsed, 8); ttime->ttime_mean = div64_ul(ttime->ttime_total + 128, ttime->ttime_samples); |
383cd7213 CFQ: move think t... |
3646 3647 3648 3649 |
} static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
c58698073 block, cfq: reorg... |
3650 |
struct cfq_io_cq *cic) |
383cd7213 CFQ: move think t... |
3651 |
{ |
f5f2b6ceb CFQ: add think ti... |
3652 |
if (cfq_cfqq_sync(cfqq)) { |
383cd7213 CFQ: move think t... |
3653 |
__cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle); |
f5f2b6ceb CFQ: add think ti... |
3654 3655 3656 |
__cfq_update_io_thinktime(&cfqq->service_tree->ttime, cfqd->cfq_slice_idle); } |
7700fc4f6 CFQ: add think ti... |
3657 3658 3659 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED __cfq_update_io_thinktime(&cfqq->cfqg->ttime, cfqd->cfq_group_idle); #endif |
22e2c507c [PATCH] Update cf... |
3660 |
} |
1da177e4c Linux-2.6.12-rc2 |
3661 |
|
206dc69b3 [BLOCK] cfq-iosch... |
3662 |
static void |
b2c18e1e0 cfq: calculate th... |
3663 |
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
6d048f531 cfq-iosched: deve... |
3664 |
struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
3665 |
{ |
3dde36dde cfq-iosched: rewo... |
3666 |
sector_t sdist = 0; |
41647e7a9 cfq-iosched: reth... |
3667 |
sector_t n_sec = blk_rq_sectors(rq); |
3dde36dde cfq-iosched: rewo... |
3668 3669 3670 3671 3672 3673 |
if (cfqq->last_request_pos) { if (cfqq->last_request_pos < blk_rq_pos(rq)) sdist = blk_rq_pos(rq) - cfqq->last_request_pos; else sdist = cfqq->last_request_pos - blk_rq_pos(rq); } |
206dc69b3 [BLOCK] cfq-iosch... |
3674 |
|
3dde36dde cfq-iosched: rewo... |
3675 |
cfqq->seek_history <<= 1; |
41647e7a9 cfq-iosched: reth... |
3676 3677 3678 3679 |
if (blk_queue_nonrot(cfqd->queue)) cfqq->seek_history |= (n_sec < CFQQ_SECT_THR_NONROT); else cfqq->seek_history |= (sdist > CFQQ_SEEK_THR); |
206dc69b3 [BLOCK] cfq-iosch... |
3680 |
} |
1da177e4c Linux-2.6.12-rc2 |
3681 |
|
a2b809672 block: replace RE... |
3682 3683 3684 3685 3686 |
static inline bool req_noidle(struct request *req) { return req_op(req) == REQ_OP_WRITE && (req->cmd_flags & (REQ_SYNC | REQ_IDLE)) == REQ_SYNC; } |
22e2c507c [PATCH] Update cf... |
3687 3688 3689 3690 3691 3692 |
/* * Disable idle window if the process thinks too long or seeks so much that * it doesn't matter */ static void cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
c58698073 block, cfq: reorg... |
3693 |
struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
3694 |
{ |
7b679138b cfq-iosched: add ... |
3695 |
int old_idle, enable_idle; |
1be92f2fc cfq-iosched: neve... |
3696 |
|
0871714e0 cfq-iosched: rela... |
3697 3698 3699 3700 |
/* * Don't idle for async or idle io prio class */ if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) |
1be92f2fc cfq-iosched: neve... |
3701 |
return; |
c265a7f41 cfq-iosched: get ... |
3702 |
enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
3703 |
|
76280aff1 cfq-iosched: idli... |
3704 3705 |
if (cfqq->queued[0] + cfqq->queued[1] >= 4) cfq_mark_cfqq_deep(cfqq); |
a2b809672 block: replace RE... |
3706 |
if (cfqq->next_rq && req_noidle(cfqq->next_rq)) |
749ef9f84 cfq: improve fsyn... |
3707 |
enable_idle = 0; |
f6e8d01be block: add io_con... |
3708 |
else if (!atomic_read(&cic->icq.ioc->active_ref) || |
c58698073 block, cfq: reorg... |
3709 3710 |
!cfqd->cfq_slice_idle || (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) |
22e2c507c [PATCH] Update cf... |
3711 |
enable_idle = 0; |
383cd7213 CFQ: move think t... |
3712 3713 |
else if (sample_valid(cic->ttime.ttime_samples)) { if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle) |
22e2c507c [PATCH] Update cf... |
3714 3715 3716 |
enable_idle = 0; else enable_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
3717 |
} |
7b679138b cfq-iosched: add ... |
3718 3719 3720 3721 3722 3723 3724 |
if (old_idle != enable_idle) { cfq_log_cfqq(cfqd, cfqq, "idle=%d", enable_idle); if (enable_idle) cfq_mark_cfqq_idle_window(cfqq); else cfq_clear_cfqq_idle_window(cfqq); } |
22e2c507c [PATCH] Update cf... |
3725 |
} |
1da177e4c Linux-2.6.12-rc2 |
3726 |
|
22e2c507c [PATCH] Update cf... |
3727 3728 3729 3730 |
/* * Check if new_cfqq should preempt the currently active queue. Return 0 for * no or if we aren't sure, a 1 will cause a preempt. */ |
a6151c3a5 cfq-iosched: appl... |
3731 |
static bool |
22e2c507c [PATCH] Update cf... |
3732 |
cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
3733 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
3734 |
{ |
6d048f531 cfq-iosched: deve... |
3735 |
struct cfq_queue *cfqq; |
22e2c507c [PATCH] Update cf... |
3736 |
|
6d048f531 cfq-iosched: deve... |
3737 3738 |
cfqq = cfqd->active_queue; if (!cfqq) |
a6151c3a5 cfq-iosched: appl... |
3739 |
return false; |
22e2c507c [PATCH] Update cf... |
3740 |
|
6d048f531 cfq-iosched: deve... |
3741 |
if (cfq_class_idle(new_cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3742 |
return false; |
22e2c507c [PATCH] Update cf... |
3743 3744 |
if (cfq_class_idle(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3745 |
return true; |
1e3335de0 cfq-iosched: impr... |
3746 |
|
22e2c507c [PATCH] Update cf... |
3747 |
/* |
875feb63b cfq-iosched: Resp... |
3748 3749 3750 3751 3752 3753 |
* Don't allow a non-RT request to preempt an ongoing RT cfqq timeslice. */ if (cfq_class_rt(cfqq) && !cfq_class_rt(new_cfqq)) return false; /* |
374f84ac3 [PATCH] cfq-iosch... |
3754 3755 3756 |
* if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
3932a86b4 cfq: fix starvati... |
3757 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq) && !cfq_cfqq_must_dispatch(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3758 |
return true; |
1e3335de0 cfq-iosched: impr... |
3759 |
|
3984aa552 cfq-iosched: Allo... |
3760 3761 3762 3763 3764 3765 |
/* * Treat ancestors of current cgroup the same way as current cgroup. * For anybody else we disallow preemption to guarantee service * fairness among cgroups. */ if (!cfqg_is_descendant(cfqq->cfqg, new_cfqq->cfqg)) |
8682e1f15 blkio: Provide so... |
3766 3767 3768 3769 |
return false; if (cfq_slice_used(cfqq)) return true; |
6c80731c7 cfq-iosched: Reor... |
3770 3771 3772 3773 3774 3775 3776 |
/* * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice. */ if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq)) return true; WARN_ON_ONCE(cfqq->ioprio_class != new_cfqq->ioprio_class); |
8682e1f15 blkio: Provide so... |
3777 |
/* Allow preemption only if we are idling on sync-noidle tree */ |
4d2ceea4c cfq-iosched: More... |
3778 |
if (cfqd->serving_wl_type == SYNC_NOIDLE_WORKLOAD && |
8682e1f15 blkio: Provide so... |
3779 |
cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD && |
8682e1f15 blkio: Provide so... |
3780 3781 |
RB_EMPTY_ROOT(&cfqq->sort_list)) return true; |
374f84ac3 [PATCH] cfq-iosch... |
3782 |
/* |
b53d1ed73 Revert "cfq: Remo... |
3783 3784 3785 |
* So both queues are sync. Let the new request get disk time if * it's a metadata request and the current queue is doing regular IO. */ |
65299a3b7 block: separate p... |
3786 |
if ((rq->cmd_flags & REQ_PRIO) && !cfqq->prio_pending) |
b53d1ed73 Revert "cfq: Remo... |
3787 |
return true; |
d2d59e18a cfq-iosched: sche... |
3788 3789 3790 |
/* An idle queue should not be idle now for some reason */ if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq)) return true; |
1e3335de0 cfq-iosched: impr... |
3791 |
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3792 |
return false; |
1e3335de0 cfq-iosched: impr... |
3793 3794 3795 3796 3797 |
/* * if this request is as-good as one we would expect from the * current cfqq, let it preempt */ |
e9ce335df cfq-iosched: fix ... |
3798 |
if (cfq_rq_close(cfqd, cfqq, rq)) |
a6151c3a5 cfq-iosched: appl... |
3799 |
return true; |
1e3335de0 cfq-iosched: impr... |
3800 |
|
a6151c3a5 cfq-iosched: appl... |
3801 |
return false; |
22e2c507c [PATCH] Update cf... |
3802 3803 3804 3805 3806 3807 3808 3809 |
} /* * cfqq preempts the active queue. if we allowed preempt with no slice left, * let it have half of its nominal slice. */ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
df0793abb block,cfq: change... |
3810 |
enum wl_type_t old_type = cfqq_type(cfqd->active_queue); |
7b679138b cfq-iosched: add ... |
3811 |
cfq_log_cfqq(cfqd, cfqq, "preempt"); |
df0793abb block,cfq: change... |
3812 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
3813 |
|
bf5722567 [PATCH] cfq-iosch... |
3814 |
/* |
f8ae6e3eb block cfq: make q... |
3815 3816 3817 |
* workload type is changed, don't save slice, otherwise preempt * doesn't happen */ |
df0793abb block,cfq: change... |
3818 |
if (old_type != cfqq_type(cfqq)) |
4d2ceea4c cfq-iosched: More... |
3819 |
cfqq->cfqg->saved_wl_slice = 0; |
f8ae6e3eb block cfq: make q... |
3820 3821 |
/* |
bf5722567 [PATCH] cfq-iosch... |
3822 3823 3824 3825 |
* Put the new queue at the front of the of the current list, * so we know that it will be selected next. */ BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
edd75ffd9 cfq-iosched: get ... |
3826 3827 |
cfq_service_tree_add(cfqd, cfqq, 1); |
eda5e0c91 cfq-iosched: Don'... |
3828 |
|
62a37f6ba cfq-iosched: Don'... |
3829 3830 |
cfqq->slice_end = 0; cfq_mark_cfqq_slice_new(cfqq); |
22e2c507c [PATCH] Update cf... |
3831 3832 3833 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
3834 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
3835 3836 3837 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
3838 3839 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
3840 |
{ |
c58698073 block, cfq: reorg... |
3841 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
3842 |
|
45333d5a3 cfq-iosched: fix ... |
3843 |
cfqd->rq_queued++; |
65299a3b7 block: separate p... |
3844 3845 |
if (rq->cmd_flags & REQ_PRIO) cfqq->prio_pending++; |
374f84ac3 [PATCH] cfq-iosch... |
3846 |
|
383cd7213 CFQ: move think t... |
3847 |
cfq_update_io_thinktime(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
3848 |
cfq_update_io_seektime(cfqd, cfqq, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
3849 |
cfq_update_idle_window(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
3850 |
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); |
22e2c507c [PATCH] Update cf... |
3851 3852 3853 |
if (cfqq == cfqd->active_queue) { /* |
b029195dd cfq-iosched: don'... |
3854 3855 3856 |
* Remember that we saw a request from this process, but * don't start queuing just yet. Otherwise we risk seeing lots * of tiny requests, because we disrupt the normal plugging |
d6ceb25e8 cfq-iosched: don'... |
3857 3858 |
* and merging. If the request is already larger than a single * page, let it rip immediately. For that case we assume that |
2d8707229 cfq-iosched: twea... |
3859 3860 3861 |
* merging is already done. Ditto for a busy system that * has other work pending, don't risk delaying until the * idle timer unplug to continue working. |
22e2c507c [PATCH] Update cf... |
3862 |
*/ |
d6ceb25e8 cfq-iosched: don'... |
3863 |
if (cfq_cfqq_wait_request(cfqq)) { |
09cbfeaf1 mm, fs: get rid o... |
3864 |
if (blk_rq_bytes(rq) > PAGE_SIZE || |
2d8707229 cfq-iosched: twea... |
3865 |
cfqd->busy_queues > 1) { |
812df48d1 blkio: Add more d... |
3866 |
cfq_del_timer(cfqd, cfqq); |
554554f60 cfq: Remove wait_... |
3867 |
cfq_clear_cfqq_wait_request(cfqq); |
24ecfbe27 block: add blk_ru... |
3868 |
__blk_run_queue(cfqd->queue); |
a11cdaa7a block: Update to ... |
3869 |
} else { |
155fead9b blkcg: move blkio... |
3870 |
cfqg_stats_update_idle_time(cfqq->cfqg); |
bf7919371 blkio: Set must_d... |
3871 |
cfq_mark_cfqq_must_dispatch(cfqq); |
a11cdaa7a block: Update to ... |
3872 |
} |
d6ceb25e8 cfq-iosched: don'... |
3873 |
} |
5e7053747 [PATCH] cfq-iosch... |
3874 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
3875 3876 3877 |
/* * not the active queue - expire current slice if it is * idle and has expired it's mean thinktime or this new queue |
3a9a3f6cc cfq-iosched: Allo... |
3878 3879 |
* has some old slice time left and is of higher priority or * this new queue is RT and the current one is BE |
22e2c507c [PATCH] Update cf... |
3880 3881 |
*/ cfq_preempt_queue(cfqd, cfqq); |
24ecfbe27 block: add blk_ru... |
3882 |
__blk_run_queue(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
3883 |
} |
1da177e4c Linux-2.6.12-rc2 |
3884 |
} |
165125e1e [BLOCK] Get rid o... |
3885 |
static void cfq_insert_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3886 |
{ |
b4878f245 [PATCH] 02/05: up... |
3887 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
3888 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
3889 |
|
7b679138b cfq-iosched: add ... |
3890 |
cfq_log_cfqq(cfqd, cfqq, "insert_request"); |
abede6da2 cfq: pass around ... |
3891 |
cfq_init_prio_data(cfqq, RQ_CIC(rq)); |
1da177e4c Linux-2.6.12-rc2 |
3892 |
|
9a7f38c42 cfq-iosched: Conv... |
3893 |
rq->fifo_time = ktime_get_ns() + cfqd->cfq_fifo_expire[rq_is_sync(rq)]; |
22e2c507c [PATCH] Update cf... |
3894 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
aa6f6a3de cfq-iosched: prep... |
3895 |
cfq_add_rq_rb(rq); |
ef295ecf0 block: better op ... |
3896 |
cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group, |
155fead9b blkcg: move blkio... |
3897 |
rq->cmd_flags); |
5e7053747 [PATCH] cfq-iosch... |
3898 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
3899 |
} |
45333d5a3 cfq-iosched: fix ... |
3900 3901 3902 3903 3904 3905 |
/* * Update hw_tag based on peak queue depth over 50 samples under * sufficient load. */ static void cfq_update_hw_tag(struct cfq_data *cfqd) { |
1a1238a7d cfq-iosched: impr... |
3906 |
struct cfq_queue *cfqq = cfqd->active_queue; |
53c583d22 cfq-iosched: requ... |
3907 3908 |
if (cfqd->rq_in_driver > cfqd->hw_tag_est_depth) cfqd->hw_tag_est_depth = cfqd->rq_in_driver; |
e459dd08f cfq-iosched: fix ... |
3909 3910 3911 |
if (cfqd->hw_tag == 1) return; |
45333d5a3 cfq-iosched: fix ... |
3912 3913 |
if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && |
53c583d22 cfq-iosched: requ... |
3914 |
cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3915 |
return; |
1a1238a7d cfq-iosched: impr... |
3916 3917 3918 3919 3920 3921 3922 |
/* * If active queue hasn't enough requests and can idle, cfq might not * dispatch sufficient requests to hardware. Don't zero hw_tag in this * case */ if (cfqq && cfq_cfqq_idle_window(cfqq) && cfqq->dispatched + cfqq->queued[0] + cfqq->queued[1] < |
53c583d22 cfq-iosched: requ... |
3923 |
CFQ_HW_QUEUE_MIN && cfqd->rq_in_driver < CFQ_HW_QUEUE_MIN) |
1a1238a7d cfq-iosched: impr... |
3924 |
return; |
45333d5a3 cfq-iosched: fix ... |
3925 3926 |
if (cfqd->hw_tag_samples++ < 50) return; |
e459dd08f cfq-iosched: fix ... |
3927 |
if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3928 3929 3930 |
cfqd->hw_tag = 1; else cfqd->hw_tag = 0; |
45333d5a3 cfq-iosched: fix ... |
3931 |
} |
7667aa063 cfq-iosched: Take... |
3932 3933 |
static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
c58698073 block, cfq: reorg... |
3934 |
struct cfq_io_cq *cic = cfqd->active_cic; |
9a7f38c42 cfq-iosched: Conv... |
3935 |
u64 now = ktime_get_ns(); |
7667aa063 cfq-iosched: Take... |
3936 |
|
02a8f01b5 cfq-iosched: Don'... |
3937 3938 3939 |
/* If the queue already has requests, don't wait */ if (!RB_EMPTY_ROOT(&cfqq->sort_list)) return false; |
7667aa063 cfq-iosched: Take... |
3940 3941 3942 |
/* If there are other queues in the group, don't wait */ if (cfqq->cfqg->nr_cfqq > 1) return false; |
7700fc4f6 CFQ: add think ti... |
3943 3944 3945 |
/* the only queue in the group, but think time is big */ if (cfq_io_thinktime_big(cfqd, &cfqq->cfqg->ttime, true)) return false; |
7667aa063 cfq-iosched: Take... |
3946 3947 3948 3949 |
if (cfq_slice_used(cfqq)) return true; /* if slice left is less than think time, wait busy */ |
383cd7213 CFQ: move think t... |
3950 |
if (cic && sample_valid(cic->ttime.ttime_samples) |
9a7f38c42 cfq-iosched: Conv... |
3951 |
&& (cfqq->slice_end - now < cic->ttime.ttime_mean)) |
7667aa063 cfq-iosched: Take... |
3952 3953 3954 3955 3956 3957 3958 3959 3960 |
return true; /* * If think times is less than a jiffy than ttime_mean=0 and above * will not be true. It might happen that slice has not expired yet * but will expire soon (4-5 ns) during select_queue(). To cover the * case where think time is less than a jiffy, mark the queue wait * busy if only 1 jiffy is left in the slice. */ |
9a7f38c42 cfq-iosched: Conv... |
3961 |
if (cfqq->slice_end - now <= jiffies_to_nsecs(1)) |
7667aa063 cfq-iosched: Take... |
3962 3963 3964 3965 |
return true; return false; } |
165125e1e [BLOCK] Get rid o... |
3966 |
static void cfq_completed_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3967 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3968 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
3969 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
3970 |
const int sync = rq_is_sync(rq); |
9a7f38c42 cfq-iosched: Conv... |
3971 |
u64 now = ktime_get_ns(); |
1da177e4c Linux-2.6.12-rc2 |
3972 |
|
a2b809672 block: replace RE... |
3973 |
cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", req_noidle(rq)); |
1da177e4c Linux-2.6.12-rc2 |
3974 |
|
45333d5a3 cfq-iosched: fix ... |
3975 |
cfq_update_hw_tag(cfqd); |
53c583d22 cfq-iosched: requ... |
3976 |
WARN_ON(!cfqd->rq_in_driver); |
6d048f531 cfq-iosched: deve... |
3977 |
WARN_ON(!cfqq->dispatched); |
53c583d22 cfq-iosched: requ... |
3978 |
cfqd->rq_in_driver--; |
6d048f531 cfq-iosched: deve... |
3979 |
cfqq->dispatched--; |
80bdf0c78 cfq-iosched: Impl... |
3980 |
(RQ_CFQG(rq))->dispatched--; |
155fead9b blkcg: move blkio... |
3981 |
cfqg_stats_update_completion(cfqq->cfqg, rq_start_time_ns(rq), |
ef295ecf0 block: better op ... |
3982 |
rq_io_start_time_ns(rq), rq->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
3983 |
|
53c583d22 cfq-iosched: requ... |
3984 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--; |
3ed9a2965 cfq-iosched: impr... |
3985 |
|
365722bb9 cfq-iosched: dela... |
3986 |
if (sync) { |
34b98d03b cfq-iosched: Rena... |
3987 |
struct cfq_rb_root *st; |
f5f2b6ceb CFQ: add think ti... |
3988 |
|
383cd7213 CFQ: move think t... |
3989 |
RQ_CIC(rq)->ttime.last_end_request = now; |
f5f2b6ceb CFQ: add think ti... |
3990 3991 |
if (cfq_cfqq_on_rr(cfqq)) |
34b98d03b cfq-iosched: Rena... |
3992 |
st = cfqq->service_tree; |
f5f2b6ceb CFQ: add think ti... |
3993 |
else |
34b98d03b cfq-iosched: Rena... |
3994 3995 3996 3997 |
st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq)); st->ttime.last_end_request = now; |
149321a61 cfq-iosched: Fix ... |
3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 |
/* * We have to do this check in jiffies since start_time is in * jiffies and it is not trivial to convert to ns. If * cfq_fifo_expire[1] ever comes close to 1 jiffie, this test * will become problematic but so far we are fine (the default * is 128 ms). */ if (!time_after(rq->start_time + nsecs_to_jiffies(cfqd->cfq_fifo_expire[1]), jiffies)) |
573412b29 cfq-iosched: redu... |
4008 |
cfqd->last_delayed_sync = now; |
365722bb9 cfq-iosched: dela... |
4009 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
4010 |
|
7700fc4f6 CFQ: add think ti... |
4011 4012 4013 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED cfqq->cfqg->ttime.last_end_request = now; #endif |
caaa5f9f0 [PATCH] cfq-iosch... |
4014 4015 4016 4017 4018 |
/* * If this is the active queue, check if it needs to be expired, * or if we want to idle in case it has no pending requests. */ if (cfqd->active_queue == cfqq) { |
a36e71f99 cfq-iosched: add ... |
4019 |
const bool cfqq_empty = RB_EMPTY_ROOT(&cfqq->sort_list); |
44f7c1606 cfq-iosched: defe... |
4020 4021 4022 4023 |
if (cfq_cfqq_slice_new(cfqq)) { cfq_set_prio_slice(cfqd, cfqq); cfq_clear_cfqq_slice_new(cfqq); } |
f75edf2dc blkio: Wait for c... |
4024 4025 |
/* |
7667aa063 cfq-iosched: Take... |
4026 4027 |
* Should we wait for next request to come in before we expire * the queue. |
f75edf2dc blkio: Wait for c... |
4028 |
*/ |
7667aa063 cfq-iosched: Take... |
4029 |
if (cfq_should_wait_busy(cfqd, cfqq)) { |
9a7f38c42 cfq-iosched: Conv... |
4030 |
u64 extend_sl = cfqd->cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
4031 4032 |
if (!cfqd->cfq_slice_idle) extend_sl = cfqd->cfq_group_idle; |
9a7f38c42 cfq-iosched: Conv... |
4033 |
cfqq->slice_end = now + extend_sl; |
f75edf2dc blkio: Wait for c... |
4034 |
cfq_mark_cfqq_wait_busy(cfqq); |
b1ffe737f cfq-iosched: Add ... |
4035 |
cfq_log_cfqq(cfqd, cfqq, "will busy wait"); |
f75edf2dc blkio: Wait for c... |
4036 |
} |
a36e71f99 cfq-iosched: add ... |
4037 |
/* |
8e550632c cfq-iosched: fix ... |
4038 4039 4040 4041 4042 4043 |
* Idling is not enabled on: * - expired queues * - idle-priority queues * - async queues * - queues with still some requests queued * - when there is a close cooperator |
a36e71f99 cfq-iosched: add ... |
4044 |
*/ |
0871714e0 cfq-iosched: rela... |
4045 |
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) |
e5ff082e8 blkio: Fix anothe... |
4046 |
cfq_slice_expired(cfqd, 1); |
8e550632c cfq-iosched: fix ... |
4047 4048 |
else if (sync && cfqq_empty && !cfq_close_cooperator(cfqd, cfqq)) { |
749ef9f84 cfq: improve fsyn... |
4049 |
cfq_arm_slice_timer(cfqd); |
8e550632c cfq-iosched: fix ... |
4050 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
4051 |
} |
6d048f531 cfq-iosched: deve... |
4052 |
|
53c583d22 cfq-iosched: requ... |
4053 |
if (!cfqd->rq_in_driver) |
23e018a1b block: get rid of... |
4054 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
4055 |
} |
ef295ecf0 block: better op ... |
4056 |
static void cfqq_boost_on_prio(struct cfq_queue *cfqq, unsigned int op) |
b8269db45 cfq-iosched: temp... |
4057 4058 4059 4060 4061 4062 |
{ /* * If REQ_PRIO is set, boost class and prio level, if it's below * BE/NORM. If prio is not set, restore the potentially boosted * class/prio level. */ |
ef295ecf0 block: better op ... |
4063 |
if (!(op & REQ_PRIO)) { |
b8269db45 cfq-iosched: temp... |
4064 4065 4066 4067 4068 4069 4070 4071 4072 |
cfqq->ioprio_class = cfqq->org_ioprio_class; cfqq->ioprio = cfqq->org_ioprio; } else { if (cfq_class_idle(cfqq)) cfqq->ioprio_class = IOPRIO_CLASS_BE; if (cfqq->ioprio > IOPRIO_NORM) cfqq->ioprio = IOPRIO_NORM; } } |
89850f7ee [PATCH] cfq-iosch... |
4073 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
4074 |
{ |
1b379d8da cfq-iosched: get ... |
4075 |
if (cfq_cfqq_wait_request(cfqq) && !cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
4076 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
4077 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
4078 |
} |
1da177e4c Linux-2.6.12-rc2 |
4079 |
|
22e2c507c [PATCH] Update cf... |
4080 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
4081 |
} |
ef295ecf0 block: better op ... |
4082 |
static int cfq_may_queue(struct request_queue *q, unsigned int op) |
22e2c507c [PATCH] Update cf... |
4083 4084 4085 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
4086 |
struct cfq_io_cq *cic; |
22e2c507c [PATCH] Update cf... |
4087 4088 4089 4090 4091 4092 4093 4094 |
struct cfq_queue *cfqq; /* * don't force setup of a queue from here, as a call to may_queue * does not necessarily imply that a request actually will be queued. * so just lookup a possibly existing queue, or return 'may queue' * if that fails */ |
4ac845a2e block: cfq: make ... |
4095 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
4096 4097 |
if (!cic) return ELV_MQUEUE_MAY; |
ef295ecf0 block: better op ... |
4098 |
cfqq = cic_to_cfqq(cic, op_is_sync(op)); |
22e2c507c [PATCH] Update cf... |
4099 |
if (cfqq) { |
abede6da2 cfq: pass around ... |
4100 |
cfq_init_prio_data(cfqq, cic); |
ef295ecf0 block: better op ... |
4101 |
cfqq_boost_on_prio(cfqq, op); |
22e2c507c [PATCH] Update cf... |
4102 |
|
89850f7ee [PATCH] cfq-iosch... |
4103 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
4104 4105 4106 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
4107 |
} |
1da177e4c Linux-2.6.12-rc2 |
4108 4109 4110 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
4111 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
4112 |
{ |
5e7053747 [PATCH] cfq-iosch... |
4113 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
4114 |
|
5e7053747 [PATCH] cfq-iosch... |
4115 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
4116 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
4117 |
|
22e2c507c [PATCH] Update cf... |
4118 4119 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
4120 |
|
7f1dc8a2d blkio: Fix blkio ... |
4121 |
/* Put down rq reference on cfqg */ |
eb7d8c07f cfq: fix cfqg ref... |
4122 |
cfqg_put(RQ_CFQG(rq)); |
a612fddf0 block, cfq: move ... |
4123 4124 |
rq->elv.priv[0] = NULL; rq->elv.priv[1] = NULL; |
7f1dc8a2d blkio: Fix blkio ... |
4125 |
|
1da177e4c Linux-2.6.12-rc2 |
4126 4127 4128 |
cfq_put_queue(cfqq); } } |
df5fe3e8e cfq: merge cooper... |
4129 |
static struct cfq_queue * |
c58698073 block, cfq: reorg... |
4130 |
cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_cq *cic, |
df5fe3e8e cfq: merge cooper... |
4131 4132 4133 4134 |
struct cfq_queue *cfqq) { cfq_log_cfqq(cfqd, cfqq, "merging with queue %p", cfqq->new_cfqq); cic_set_cfqq(cic, cfqq->new_cfqq, 1); |
b3b6d0408 cfq: change the m... |
4135 |
cfq_mark_cfqq_coop(cfqq->new_cfqq); |
df5fe3e8e cfq: merge cooper... |
4136 4137 4138 |
cfq_put_queue(cfqq); return cic_to_cfqq(cic, 1); } |
e6c5bc737 cfq: break apart ... |
4139 4140 4141 4142 4143 |
/* * Returns NULL if a new cfqq should be allocated, or the old cfqq if this * was the last process referring to said cfqq. */ static struct cfq_queue * |
c58698073 block, cfq: reorg... |
4144 |
split_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq) |
e6c5bc737 cfq: break apart ... |
4145 4146 |
{ if (cfqq_process_refs(cfqq) == 1) { |
e6c5bc737 cfq: break apart ... |
4147 4148 |
cfqq->pid = current->pid; cfq_clear_cfqq_coop(cfqq); |
ae54abed6 cfq-iosched: spli... |
4149 |
cfq_clear_cfqq_split_coop(cfqq); |
e6c5bc737 cfq: break apart ... |
4150 4151 4152 4153 |
return cfqq; } cic_set_cfqq(cic, NULL, 1); |
d02a2c077 cfq-iosched: fix ... |
4154 4155 |
cfq_put_cooperator(cfqq); |
e6c5bc737 cfq: break apart ... |
4156 4157 4158 |
cfq_put_queue(cfqq); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
4159 |
/* |
22e2c507c [PATCH] Update cf... |
4160 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
4161 |
*/ |
22e2c507c [PATCH] Update cf... |
4162 |
static int |
852c788f8 block: implement ... |
4163 4164 |
cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
4165 4166 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
f1f8cc946 block, cfq: move ... |
4167 |
struct cfq_io_cq *cic = icq_to_cic(rq->elv.icq); |
1da177e4c Linux-2.6.12-rc2 |
4168 |
const int rw = rq_data_dir(rq); |
a6151c3a5 cfq-iosched: appl... |
4169 |
const bool is_sync = rq_is_sync(rq); |
22e2c507c [PATCH] Update cf... |
4170 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
4171 |
|
216284c35 block, cfq: fix r... |
4172 |
spin_lock_irq(q->queue_lock); |
f1f8cc946 block, cfq: move ... |
4173 |
|
598971bfb cfq: don't use ic... |
4174 |
check_ioprio_changed(cic, bio); |
142bbdfcc cfq: Disable writ... |
4175 |
check_blkcg_changed(cic, bio); |
e6c5bc737 cfq: break apart ... |
4176 |
new_queue: |
91fac317a cfq-iosched: get ... |
4177 |
cfqq = cic_to_cfqq(cic, is_sync); |
32f2e807a cfq-iosched: rese... |
4178 |
if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
bce6133b0 cfq-iosched: fix ... |
4179 4180 |
if (cfqq) cfq_put_queue(cfqq); |
2da8de0bb cfq-iosched: remo... |
4181 |
cfqq = cfq_get_queue(cfqd, is_sync, cic, bio); |
91fac317a cfq-iosched: get ... |
4182 |
cic_set_cfqq(cic, cfqq, is_sync); |
df5fe3e8e cfq: merge cooper... |
4183 4184 |
} else { /* |
e6c5bc737 cfq: break apart ... |
4185 4186 |
* If the queue was seeky for too long, break it apart. */ |
ae54abed6 cfq-iosched: spli... |
4187 |
if (cfq_cfqq_coop(cfqq) && cfq_cfqq_split_coop(cfqq)) { |
e6c5bc737 cfq: break apart ... |
4188 4189 4190 4191 4192 4193 4194 |
cfq_log_cfqq(cfqd, cfqq, "breaking apart cfqq"); cfqq = split_cfqq(cic, cfqq); if (!cfqq) goto new_queue; } /* |
df5fe3e8e cfq: merge cooper... |
4195 4196 4197 4198 4199 4200 4201 |
* Check to see if this queue is scheduled to merge with * another, closely cooperating queue. The merging of * queues happens here as it must be done in process context. * The reference on new_cfqq was taken in merge_cfqqs. */ if (cfqq->new_cfqq) cfqq = cfq_merge_cfqqs(cfqd, cic, cfqq); |
91fac317a cfq-iosched: get ... |
4202 |
} |
1da177e4c Linux-2.6.12-rc2 |
4203 4204 |
cfqq->allocated[rw]++; |
1da177e4c Linux-2.6.12-rc2 |
4205 |
|
6fae9c251 Merge commit 'v2.... |
4206 |
cfqq->ref++; |
eb7d8c07f cfq: fix cfqg ref... |
4207 |
cfqg_get(cfqq->cfqg); |
a612fddf0 block, cfq: move ... |
4208 |
rq->elv.priv[0] = cfqq; |
1adaf3dde blkcg: move refcn... |
4209 |
rq->elv.priv[1] = cfqq->cfqg; |
216284c35 block, cfq: fix r... |
4210 |
spin_unlock_irq(q->queue_lock); |
5d7f5ce15 cfq-iosched: don'... |
4211 |
|
5e7053747 [PATCH] cfq-iosch... |
4212 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
4213 |
} |
65f27f384 WorkStruct: Pass ... |
4214 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
4215 |
{ |
65f27f384 WorkStruct: Pass ... |
4216 |
struct cfq_data *cfqd = |
23e018a1b block: get rid of... |
4217 |
container_of(work, struct cfq_data, unplug_work); |
165125e1e [BLOCK] Get rid o... |
4218 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
4219 |
|
40bb54d19 cfq-iosched: no n... |
4220 |
spin_lock_irq(q->queue_lock); |
24ecfbe27 block: add blk_ru... |
4221 |
__blk_run_queue(cfqd->queue); |
40bb54d19 cfq-iosched: no n... |
4222 |
spin_unlock_irq(q->queue_lock); |
22e2c507c [PATCH] Update cf... |
4223 4224 4225 4226 4227 |
} /* * Timer running if the active_queue is currently idling inside its time slice */ |
911483258 cfq-iosched: Conv... |
4228 |
static enum hrtimer_restart cfq_idle_slice_timer(struct hrtimer *timer) |
22e2c507c [PATCH] Update cf... |
4229 |
{ |
911483258 cfq-iosched: Conv... |
4230 4231 |
struct cfq_data *cfqd = container_of(timer, struct cfq_data, idle_slice_timer); |
22e2c507c [PATCH] Update cf... |
4232 4233 |
struct cfq_queue *cfqq; unsigned long flags; |
3c6bd2f87 cfq-iosched: chec... |
4234 |
int timed_out = 1; |
22e2c507c [PATCH] Update cf... |
4235 |
|
7b679138b cfq-iosched: add ... |
4236 |
cfq_log(cfqd, "idle timer fired"); |
22e2c507c [PATCH] Update cf... |
4237 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
fe094d98e cfq-iosched: make... |
4238 4239 |
cfqq = cfqd->active_queue; if (cfqq) { |
3c6bd2f87 cfq-iosched: chec... |
4240 |
timed_out = 0; |
22e2c507c [PATCH] Update cf... |
4241 |
/* |
b029195dd cfq-iosched: don'... |
4242 4243 4244 4245 4246 4247 |
* We saw a request before the queue expired, let it through */ if (cfq_cfqq_must_dispatch(cfqq)) goto out_kick; /* |
22e2c507c [PATCH] Update cf... |
4248 4249 |
* expired */ |
44f7c1606 cfq-iosched: defe... |
4250 |
if (cfq_slice_used(cfqq)) |
22e2c507c [PATCH] Update cf... |
4251 4252 4253 4254 4255 4256 |
goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
4257 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
4258 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
4259 4260 4261 4262 |
/* * not expired and it has a request pending, let it dispatch */ |
75e50984f cfq-iosched: kill... |
4263 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
4264 |
goto out_kick; |
76280aff1 cfq-iosched: idli... |
4265 4266 4267 4268 4269 |
/* * Queue depth flag is reset only when the idle didn't succeed */ cfq_clear_cfqq_deep(cfqq); |
22e2c507c [PATCH] Update cf... |
4270 4271 |
} expire: |
e5ff082e8 blkio: Fix anothe... |
4272 |
cfq_slice_expired(cfqd, timed_out); |
22e2c507c [PATCH] Update cf... |
4273 |
out_kick: |
23e018a1b block: get rid of... |
4274 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
4275 4276 |
out_cont: spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
911483258 cfq-iosched: Conv... |
4277 |
return HRTIMER_NORESTART; |
22e2c507c [PATCH] Update cf... |
4278 |
} |
3b18152c3 [PATCH] CFQ io sc... |
4279 4280 |
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) { |
911483258 cfq-iosched: Conv... |
4281 |
hrtimer_cancel(&cfqd->idle_slice_timer); |
23e018a1b block: get rid of... |
4282 |
cancel_work_sync(&cfqd->unplug_work); |
3b18152c3 [PATCH] CFQ io sc... |
4283 |
} |
22e2c507c [PATCH] Update cf... |
4284 |
|
b374d18a4 block: get rid of... |
4285 |
static void cfq_exit_queue(struct elevator_queue *e) |
1da177e4c Linux-2.6.12-rc2 |
4286 |
{ |
22e2c507c [PATCH] Update cf... |
4287 |
struct cfq_data *cfqd = e->elevator_data; |
165125e1e [BLOCK] Get rid o... |
4288 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
4289 |
|
3b18152c3 [PATCH] CFQ io sc... |
4290 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
4291 |
|
d9ff41879 [PATCH] make cfq_... |
4292 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
4293 |
|
d9ff41879 [PATCH] make cfq_... |
4294 |
if (cfqd->active_queue) |
e5ff082e8 blkio: Fix anothe... |
4295 |
__cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
4296 |
|
03aa264ac blkcg: let blkcg ... |
4297 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
4298 |
cfq_shutdown_timer_wq(cfqd); |
ffea73fc7 block: blkcg_poli... |
4299 4300 4301 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED blkcg_deactivate_policy(q, &blkcg_policy_cfq); #else |
f51b802c1 blkcg: use the us... |
4302 |
kfree(cfqd->root_group); |
2abae55f5 cfq-iosched: Fix ... |
4303 |
#endif |
56edf7d75 cfq-iosched: Fix ... |
4304 |
kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
4305 |
} |
d50235b7b elevator: Fix a r... |
4306 |
static int cfq_init_queue(struct request_queue *q, struct elevator_type *e) |
1da177e4c Linux-2.6.12-rc2 |
4307 4308 |
{ struct cfq_data *cfqd; |
3c798398e blkcg: mass renam... |
4309 |
struct blkcg_gq *blkg __maybe_unused; |
a2b1693ba blkcg: implement ... |
4310 |
int i, ret; |
d50235b7b elevator: Fix a r... |
4311 4312 4313 4314 4315 |
struct elevator_queue *eq; eq = elevator_alloc(q, e); if (!eq) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
4316 |
|
c1b511eb2 block: Convert km... |
4317 |
cfqd = kzalloc_node(sizeof(*cfqd), GFP_KERNEL, q->node); |
d50235b7b elevator: Fix a r... |
4318 4319 |
if (!cfqd) { kobject_put(&eq->kobj); |
b2fab5acd elevator: make el... |
4320 |
return -ENOMEM; |
d50235b7b elevator: Fix a r... |
4321 4322 |
} eq->elevator_data = cfqd; |
80b15c738 cfq-iosched: comp... |
4323 |
|
f51b802c1 blkcg: use the us... |
4324 |
cfqd->queue = q; |
d50235b7b elevator: Fix a r... |
4325 4326 4327 |
spin_lock_irq(q->queue_lock); q->elevator = eq; spin_unlock_irq(q->queue_lock); |
f51b802c1 blkcg: use the us... |
4328 |
|
1fa8f6d68 blkio: Introduce ... |
4329 4330 |
/* Init root service tree */ cfqd->grp_service_tree = CFQ_RB_ROOT; |
f51b802c1 blkcg: use the us... |
4331 |
/* Init root group and prefer root group over other groups by default */ |
25fb5169d blkio: Dynamic cf... |
4332 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4333 |
ret = blkcg_activate_policy(q, &blkcg_policy_cfq); |
a2b1693ba blkcg: implement ... |
4334 4335 |
if (ret) goto out_free; |
f51b802c1 blkcg: use the us... |
4336 |
|
a2b1693ba blkcg: implement ... |
4337 |
cfqd->root_group = blkg_to_cfqg(q->root_blkg); |
f51b802c1 blkcg: use the us... |
4338 |
#else |
a2b1693ba blkcg: implement ... |
4339 |
ret = -ENOMEM; |
f51b802c1 blkcg: use the us... |
4340 4341 |
cfqd->root_group = kzalloc_node(sizeof(*cfqd->root_group), GFP_KERNEL, cfqd->queue->node); |
a2b1693ba blkcg: implement ... |
4342 4343 |
if (!cfqd->root_group) goto out_free; |
5624a4e44 blk-throttle: Mak... |
4344 |
|
a2b1693ba blkcg: implement ... |
4345 |
cfq_init_cfqg_base(cfqd->root_group); |
3ecca6293 blkcg: s/CFQ_WEIG... |
4346 4347 |
cfqd->root_group->weight = 2 * CFQ_WEIGHT_LEGACY_DFL; cfqd->root_group->leaf_weight = 2 * CFQ_WEIGHT_LEGACY_DFL; |
69d7fde59 blkcg: use CGROUP... |
4348 |
#endif |
5624a4e44 blk-throttle: Mak... |
4349 |
|
26a2ac009 cfq-iosched: clea... |
4350 4351 4352 4353 4354 4355 4356 |
/* * Not strictly needed (since RB_ROOT just clears the node and we * zeroed cfqd on alloc), but better be safe in case someone decides * to add magic to the rb code */ for (i = 0; i < CFQ_PRIO_LISTS; i++) cfqd->prio_trees[i] = RB_ROOT; |
6118b70b3 cfq-iosched: get ... |
4357 |
/* |
d4aad7ff0 cfq-iosched: fold... |
4358 |
* Our fallback cfqq if cfq_get_queue() runs into OOM issues. |
6118b70b3 cfq-iosched: get ... |
4359 |
* Grab a permanent reference to it, so that the normal code flow |
f51b802c1 blkcg: use the us... |
4360 4361 4362 |
* will not attempt to free it. oom_cfqq is linked to root_group * but shouldn't hold a reference as it'll never be unlinked. Lose * the reference from linking right away. |
6118b70b3 cfq-iosched: get ... |
4363 4364 |
*/ cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0); |
30d7b9448 block cfq: don't ... |
4365 |
cfqd->oom_cfqq.ref++; |
1adaf3dde blkcg: move refcn... |
4366 4367 |
spin_lock_irq(q->queue_lock); |
f51b802c1 blkcg: use the us... |
4368 |
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group); |
eb7d8c07f cfq: fix cfqg ref... |
4369 |
cfqg_put(cfqd->root_group); |
1adaf3dde blkcg: move refcn... |
4370 |
spin_unlock_irq(q->queue_lock); |
1da177e4c Linux-2.6.12-rc2 |
4371 |
|
911483258 cfq-iosched: Conv... |
4372 4373 |
hrtimer_init(&cfqd->idle_slice_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
22e2c507c [PATCH] Update cf... |
4374 |
cfqd->idle_slice_timer.function = cfq_idle_slice_timer; |
22e2c507c [PATCH] Update cf... |
4375 |
|
23e018a1b block: get rid of... |
4376 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
4377 |
|
1da177e4c Linux-2.6.12-rc2 |
4378 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
4379 4380 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
4381 4382 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
4383 4384 |
cfqd->cfq_slice[0] = cfq_slice_async; cfqd->cfq_slice[1] = cfq_slice_sync; |
5bf14c072 block: Make cfq_t... |
4385 |
cfqd->cfq_target_latency = cfq_target_latency; |
22e2c507c [PATCH] Update cf... |
4386 |
cfqd->cfq_slice_async_rq = cfq_slice_async_rq; |
0bb979472 cfq-iosched: fix ... |
4387 |
cfqd->cfq_slice_idle = cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
4388 |
cfqd->cfq_group_idle = cfq_group_idle; |
963b72fc6 cfq-iosched: rena... |
4389 |
cfqd->cfq_latency = 1; |
e459dd08f cfq-iosched: fix ... |
4390 |
cfqd->hw_tag = -1; |
edc71131c cfq-iosched: comm... |
4391 4392 4393 4394 |
/* * we optimistically start assuming sync ops weren't delayed in last * second, in order to have larger depth for async operations. */ |
9a7f38c42 cfq-iosched: Conv... |
4395 |
cfqd->last_delayed_sync = ktime_get_ns() - NSEC_PER_SEC; |
b2fab5acd elevator: make el... |
4396 |
return 0; |
a2b1693ba blkcg: implement ... |
4397 4398 4399 |
out_free: kfree(cfqd); |
d50235b7b elevator: Fix a r... |
4400 |
kobject_put(&eq->kobj); |
a2b1693ba blkcg: implement ... |
4401 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
4402 |
} |
0bb979472 cfq-iosched: fix ... |
4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 |
static void cfq_registered_queue(struct request_queue *q) { struct elevator_queue *e = q->elevator; struct cfq_data *cfqd = e->elevator_data; /* * Default to IOPS mode with no idling for SSDs */ if (blk_queue_nonrot(q)) cfqd->cfq_slice_idle = 0; |
142bbdfcc cfq: Disable writ... |
4413 |
wbt_disable_default(q); |
0bb979472 cfq-iosched: fix ... |
4414 |
} |
1da177e4c Linux-2.6.12-rc2 |
4415 4416 4417 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
4418 4419 4420 |
static ssize_t cfq_var_show(unsigned int var, char *page) { |
176167ad9 block: Fix format... |
4421 4422 |
return sprintf(page, "%u ", var); |
1da177e4c Linux-2.6.12-rc2 |
4423 |
} |
235f8da11 block, scheduler:... |
4424 4425 |
static void cfq_var_store(unsigned int *var, const char *page) |
1da177e4c Linux-2.6.12-rc2 |
4426 4427 4428 4429 |
{ char *p = (char *) page; *var = simple_strtoul(p, &p, 10); |
1da177e4c Linux-2.6.12-rc2 |
4430 |
} |
1da177e4c Linux-2.6.12-rc2 |
4431 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
b374d18a4 block: get rid of... |
4432 |
static ssize_t __FUNC(struct elevator_queue *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
4433 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
4434 |
struct cfq_data *cfqd = e->elevator_data; \ |
9a7f38c42 cfq-iosched: Conv... |
4435 |
u64 __data = __VAR; \ |
1da177e4c Linux-2.6.12-rc2 |
4436 |
if (__CONV) \ |
9a7f38c42 cfq-iosched: Conv... |
4437 |
__data = div_u64(__data, NSEC_PER_MSEC); \ |
1da177e4c Linux-2.6.12-rc2 |
4438 4439 4440 |
return cfq_var_show(__data, (page)); \ } SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
22e2c507c [PATCH] Update cf... |
4441 4442 |
SHOW_FUNCTION(cfq_fifo_expire_sync_show, cfqd->cfq_fifo_expire[1], 1); SHOW_FUNCTION(cfq_fifo_expire_async_show, cfqd->cfq_fifo_expire[0], 1); |
e572ec7e4 [PATCH] fix rmmod... |
4443 4444 |
SHOW_FUNCTION(cfq_back_seek_max_show, cfqd->cfq_back_max, 0); SHOW_FUNCTION(cfq_back_seek_penalty_show, cfqd->cfq_back_penalty, 0); |
22e2c507c [PATCH] Update cf... |
4445 |
SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); |
80bdf0c78 cfq-iosched: Impl... |
4446 |
SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1); |
22e2c507c [PATCH] Update cf... |
4447 4448 4449 |
SHOW_FUNCTION(cfq_slice_sync_show, cfqd->cfq_slice[1], 1); SHOW_FUNCTION(cfq_slice_async_show, cfqd->cfq_slice[0], 1); SHOW_FUNCTION(cfq_slice_async_rq_show, cfqd->cfq_slice_async_rq, 0); |
963b72fc6 cfq-iosched: rena... |
4450 |
SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); |
5bf14c072 block: Make cfq_t... |
4451 |
SHOW_FUNCTION(cfq_target_latency_show, cfqd->cfq_target_latency, 1); |
1da177e4c Linux-2.6.12-rc2 |
4452 |
#undef SHOW_FUNCTION |
d2d481d04 cfq-iosched: Expo... |
4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 |
#define USEC_SHOW_FUNCTION(__FUNC, __VAR) \ static ssize_t __FUNC(struct elevator_queue *e, char *page) \ { \ struct cfq_data *cfqd = e->elevator_data; \ u64 __data = __VAR; \ __data = div_u64(__data, NSEC_PER_USEC); \ return cfq_var_show(__data, (page)); \ } USEC_SHOW_FUNCTION(cfq_slice_idle_us_show, cfqd->cfq_slice_idle); USEC_SHOW_FUNCTION(cfq_group_idle_us_show, cfqd->cfq_group_idle); USEC_SHOW_FUNCTION(cfq_slice_sync_us_show, cfqd->cfq_slice[1]); USEC_SHOW_FUNCTION(cfq_slice_async_us_show, cfqd->cfq_slice[0]); USEC_SHOW_FUNCTION(cfq_target_latency_us_show, cfqd->cfq_target_latency); #undef USEC_SHOW_FUNCTION |
1da177e4c Linux-2.6.12-rc2 |
4467 |
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
b374d18a4 block: get rid of... |
4468 |
static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
4469 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
4470 |
struct cfq_data *cfqd = e->elevator_data; \ |
9dd38052a cfq: Suppress com... |
4471 4472 |
unsigned int __data, __min = (MIN), __max = (MAX); \ \ |
235f8da11 block, scheduler:... |
4473 |
cfq_var_store(&__data, (page)); \ |
9dd38052a cfq: Suppress com... |
4474 4475 4476 4477 |
if (__data < __min) \ __data = __min; \ else if (__data > __max) \ __data = __max; \ |
1da177e4c Linux-2.6.12-rc2 |
4478 |
if (__CONV) \ |
9a7f38c42 cfq-iosched: Conv... |
4479 |
*(__PTR) = (u64)__data * NSEC_PER_MSEC; \ |
1da177e4c Linux-2.6.12-rc2 |
4480 4481 |
else \ *(__PTR) = __data; \ |
235f8da11 block, scheduler:... |
4482 |
return count; \ |
1da177e4c Linux-2.6.12-rc2 |
4483 4484 |
} STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
4485 4486 4487 4488 |
STORE_FUNCTION(cfq_fifo_expire_sync_store, &cfqd->cfq_fifo_expire[1], 1, UINT_MAX, 1); STORE_FUNCTION(cfq_fifo_expire_async_store, &cfqd->cfq_fifo_expire[0], 1, UINT_MAX, 1); |
e572ec7e4 [PATCH] fix rmmod... |
4489 |
STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
4490 4491 |
STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
4492 |
STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); |
80bdf0c78 cfq-iosched: Impl... |
4493 |
STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1); |
22e2c507c [PATCH] Update cf... |
4494 4495 |
STORE_FUNCTION(cfq_slice_sync_store, &cfqd->cfq_slice[1], 1, UINT_MAX, 1); STORE_FUNCTION(cfq_slice_async_store, &cfqd->cfq_slice[0], 1, UINT_MAX, 1); |
fe094d98e cfq-iosched: make... |
4496 4497 |
STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, UINT_MAX, 0); |
963b72fc6 cfq-iosched: rena... |
4498 |
STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); |
5bf14c072 block: Make cfq_t... |
4499 |
STORE_FUNCTION(cfq_target_latency_store, &cfqd->cfq_target_latency, 1, UINT_MAX, 1); |
1da177e4c Linux-2.6.12-rc2 |
4500 |
#undef STORE_FUNCTION |
d2d481d04 cfq-iosched: Expo... |
4501 4502 4503 4504 |
#define USEC_STORE_FUNCTION(__FUNC, __PTR, MIN, MAX) \ static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ { \ struct cfq_data *cfqd = e->elevator_data; \ |
9dd38052a cfq: Suppress com... |
4505 4506 |
unsigned int __data, __min = (MIN), __max = (MAX); \ \ |
235f8da11 block, scheduler:... |
4507 |
cfq_var_store(&__data, (page)); \ |
9dd38052a cfq: Suppress com... |
4508 4509 4510 4511 |
if (__data < __min) \ __data = __min; \ else if (__data > __max) \ __data = __max; \ |
d2d481d04 cfq-iosched: Expo... |
4512 |
*(__PTR) = (u64)__data * NSEC_PER_USEC; \ |
235f8da11 block, scheduler:... |
4513 |
return count; \ |
d2d481d04 cfq-iosched: Expo... |
4514 4515 4516 4517 4518 4519 4520 |
} USEC_STORE_FUNCTION(cfq_slice_idle_us_store, &cfqd->cfq_slice_idle, 0, UINT_MAX); USEC_STORE_FUNCTION(cfq_group_idle_us_store, &cfqd->cfq_group_idle, 0, UINT_MAX); USEC_STORE_FUNCTION(cfq_slice_sync_us_store, &cfqd->cfq_slice[1], 1, UINT_MAX); USEC_STORE_FUNCTION(cfq_slice_async_us_store, &cfqd->cfq_slice[0], 1, UINT_MAX); USEC_STORE_FUNCTION(cfq_target_latency_us_store, &cfqd->cfq_target_latency, 1, UINT_MAX); #undef USEC_STORE_FUNCTION |
e572ec7e4 [PATCH] fix rmmod... |
4521 4522 4523 4524 4525 |
#define CFQ_ATTR(name) \ __ATTR(name, S_IRUGO|S_IWUSR, cfq_##name##_show, cfq_##name##_store) static struct elv_fs_entry cfq_attrs[] = { CFQ_ATTR(quantum), |
e572ec7e4 [PATCH] fix rmmod... |
4526 4527 4528 4529 4530 |
CFQ_ATTR(fifo_expire_sync), CFQ_ATTR(fifo_expire_async), CFQ_ATTR(back_seek_max), CFQ_ATTR(back_seek_penalty), CFQ_ATTR(slice_sync), |
d2d481d04 cfq-iosched: Expo... |
4531 |
CFQ_ATTR(slice_sync_us), |
e572ec7e4 [PATCH] fix rmmod... |
4532 |
CFQ_ATTR(slice_async), |
d2d481d04 cfq-iosched: Expo... |
4533 |
CFQ_ATTR(slice_async_us), |
e572ec7e4 [PATCH] fix rmmod... |
4534 4535 |
CFQ_ATTR(slice_async_rq), CFQ_ATTR(slice_idle), |
d2d481d04 cfq-iosched: Expo... |
4536 |
CFQ_ATTR(slice_idle_us), |
80bdf0c78 cfq-iosched: Impl... |
4537 |
CFQ_ATTR(group_idle), |
d2d481d04 cfq-iosched: Expo... |
4538 |
CFQ_ATTR(group_idle_us), |
963b72fc6 cfq-iosched: rena... |
4539 |
CFQ_ATTR(low_latency), |
5bf14c072 block: Make cfq_t... |
4540 |
CFQ_ATTR(target_latency), |
d2d481d04 cfq-iosched: Expo... |
4541 |
CFQ_ATTR(target_latency_us), |
e572ec7e4 [PATCH] fix rmmod... |
4542 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
4543 |
}; |
1da177e4c Linux-2.6.12-rc2 |
4544 |
static struct elevator_type iosched_cfq = { |
c51ca6cf5 block: move exist... |
4545 |
.ops.sq = { |
1da177e4c Linux-2.6.12-rc2 |
4546 4547 4548 |
.elevator_merge_fn = cfq_merge, .elevator_merged_fn = cfq_merged_request, .elevator_merge_req_fn = cfq_merged_requests, |
72ef799b3 block: do not mer... |
4549 4550 |
.elevator_allow_bio_merge_fn = cfq_allow_bio_merge, .elevator_allow_rq_merge_fn = cfq_allow_rq_merge, |
812d40264 blkio: Add io_mer... |
4551 |
.elevator_bio_merged_fn = cfq_bio_merged, |
b4878f245 [PATCH] 02/05: up... |
4552 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
4553 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
4554 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
4555 |
.elevator_deactivate_req_fn = cfq_deactivate_request, |
1da177e4c Linux-2.6.12-rc2 |
4556 |
.elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
4557 4558 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
9b84cacd0 block, cfq: restr... |
4559 |
.elevator_init_icq_fn = cfq_init_icq, |
7e5a87944 block, cfq: move ... |
4560 |
.elevator_exit_icq_fn = cfq_exit_icq, |
1da177e4c Linux-2.6.12-rc2 |
4561 4562 4563 4564 4565 |
.elevator_set_req_fn = cfq_set_request, .elevator_put_req_fn = cfq_put_request, .elevator_may_queue_fn = cfq_may_queue, .elevator_init_fn = cfq_init_queue, .elevator_exit_fn = cfq_exit_queue, |
0bb979472 cfq-iosched: fix ... |
4566 |
.elevator_registered_fn = cfq_registered_queue, |
1da177e4c Linux-2.6.12-rc2 |
4567 |
}, |
3d3c2379f block, cfq: move ... |
4568 4569 |
.icq_size = sizeof(struct cfq_io_cq), .icq_align = __alignof__(struct cfq_io_cq), |
3d1ab40f4 [PATCH] elevator_... |
4570 |
.elevator_attrs = cfq_attrs, |
3d3c2379f block, cfq: move ... |
4571 |
.elevator_name = "cfq", |
1da177e4c Linux-2.6.12-rc2 |
4572 4573 |
.elevator_owner = THIS_MODULE, }; |
3e2520668 blkio: Implement ... |
4574 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4575 |
static struct blkcg_policy blkcg_policy_cfq = { |
2ee867dcf blkcg: implement ... |
4576 |
.dfl_cftypes = cfq_blkcg_files, |
880f50e22 blkcg: mark exist... |
4577 |
.legacy_cftypes = cfq_blkcg_legacy_files, |
f9fcc2d39 blkcg: collapse b... |
4578 |
|
e4a9bde95 blkcg: replace bl... |
4579 |
.cpd_alloc_fn = cfq_cpd_alloc, |
e48453c38 block, cgroup: im... |
4580 |
.cpd_init_fn = cfq_cpd_init, |
e4a9bde95 blkcg: replace bl... |
4581 |
.cpd_free_fn = cfq_cpd_free, |
69d7fde59 blkcg: use CGROUP... |
4582 |
.cpd_bind_fn = cfq_cpd_bind, |
e4a9bde95 blkcg: replace bl... |
4583 |
|
001bea73e blkcg: replace bl... |
4584 |
.pd_alloc_fn = cfq_pd_alloc, |
f9fcc2d39 blkcg: collapse b... |
4585 |
.pd_init_fn = cfq_pd_init, |
0b39920b5 cfq-iosched: coll... |
4586 |
.pd_offline_fn = cfq_pd_offline, |
001bea73e blkcg: replace bl... |
4587 |
.pd_free_fn = cfq_pd_free, |
f9fcc2d39 blkcg: collapse b... |
4588 |
.pd_reset_stats_fn = cfq_pd_reset_stats, |
3e2520668 blkio: Implement ... |
4589 |
}; |
3e2520668 blkio: Implement ... |
4590 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
4591 4592 |
static int __init cfq_init(void) { |
3d3c2379f block, cfq: move ... |
4593 |
int ret; |
80bdf0c78 cfq-iosched: Impl... |
4594 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4595 |
ret = blkcg_policy_register(&blkcg_policy_cfq); |
8bd435b30 blkcg: remove sta... |
4596 4597 |
if (ret) return ret; |
ffea73fc7 block: blkcg_poli... |
4598 4599 4600 |
#else cfq_group_idle = 0; #endif |
8bd435b30 blkcg: remove sta... |
4601 |
|
fd7949564 block: fix return... |
4602 |
ret = -ENOMEM; |
3d3c2379f block, cfq: move ... |
4603 4604 |
cfq_pool = KMEM_CACHE(cfq_queue, 0); if (!cfq_pool) |
8bd435b30 blkcg: remove sta... |
4605 |
goto err_pol_unreg; |
1da177e4c Linux-2.6.12-rc2 |
4606 |
|
3d3c2379f block, cfq: move ... |
4607 |
ret = elv_register(&iosched_cfq); |
8bd435b30 blkcg: remove sta... |
4608 4609 |
if (ret) goto err_free_pool; |
3d3c2379f block, cfq: move ... |
4610 |
|
2fdd82bd8 block: let elv_re... |
4611 |
return 0; |
8bd435b30 blkcg: remove sta... |
4612 4613 4614 4615 |
err_free_pool: kmem_cache_destroy(cfq_pool); err_pol_unreg: |
ffea73fc7 block: blkcg_poli... |
4616 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4617 |
blkcg_policy_unregister(&blkcg_policy_cfq); |
ffea73fc7 block: blkcg_poli... |
4618 |
#endif |
8bd435b30 blkcg: remove sta... |
4619 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
4620 4621 4622 4623 |
} static void __exit cfq_exit(void) { |
ffea73fc7 block: blkcg_poli... |
4624 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4625 |
blkcg_policy_unregister(&blkcg_policy_cfq); |
ffea73fc7 block: blkcg_poli... |
4626 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
4627 |
elv_unregister(&iosched_cfq); |
3d3c2379f block, cfq: move ... |
4628 |
kmem_cache_destroy(cfq_pool); |
1da177e4c Linux-2.6.12-rc2 |
4629 4630 4631 4632 4633 4634 4635 4636 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |