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block/cfq-iosched.c
127 KB
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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/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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/* * 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 service tree |
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*/ |
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#define CFQ_IDLE_DELAY (NSEC_PER_SEC / 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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|
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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 { struct rb_root rb; struct rb_node *left; |
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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, \ |
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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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|
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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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|
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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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|
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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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|
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static struct cfq_rb_root *st_for(struct cfq_group *cfqg, |
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enum wl_class_t class, |
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enum wl_type_t type) |
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{ |
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if (!cfqg) return NULL; |
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if (class == IDLE_WORKLOAD) |
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return &cfqg->service_tree_idle; |
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|
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return &cfqg->service_trees[class][type]; |
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393 |
} |
3b18152c3 [PATCH] CFQ io sc... |
394 |
enum cfqq_state_flags { |
b0b8d7494 cfq-iosched: docu... |
395 396 |
CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ |
b029195dd cfq-iosched: don'... |
397 |
CFQ_CFQQ_FLAG_must_dispatch, /* must be allowed a dispatch */ |
b0b8d7494 cfq-iosched: docu... |
398 |
CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ |
b0b8d7494 cfq-iosched: docu... |
399 400 401 |
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... |
402 |
CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
91fac317a cfq-iosched: get ... |
403 |
CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
b3b6d0408 cfq: change the m... |
404 |
CFQ_CFQQ_FLAG_coop, /* cfqq is shared */ |
ae54abed6 cfq-iosched: spli... |
405 |
CFQ_CFQQ_FLAG_split_coop, /* shared cfqq will be splitted */ |
76280aff1 cfq-iosched: idli... |
406 |
CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */ |
f75edf2dc blkio: Wait for c... |
407 |
CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */ |
3b18152c3 [PATCH] CFQ io sc... |
408 409 410 411 412 |
}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
413 |
(cfqq)->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ |
3b18152c3 [PATCH] CFQ io sc... |
414 415 416 |
} \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
417 |
(cfqq)->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ |
3b18152c3 [PATCH] CFQ io sc... |
418 419 420 |
} \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ |
fe094d98e cfq-iosched: make... |
421 |
return ((cfqq)->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ |
3b18152c3 [PATCH] CFQ io sc... |
422 423 424 425 |
} CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); |
b029195dd cfq-iosched: don'... |
426 |
CFQ_CFQQ_FNS(must_dispatch); |
3b18152c3 [PATCH] CFQ io sc... |
427 |
CFQ_CFQQ_FNS(must_alloc_slice); |
3b18152c3 [PATCH] CFQ io sc... |
428 429 430 |
CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
44f7c1606 cfq-iosched: defe... |
431 |
CFQ_CFQQ_FNS(slice_new); |
91fac317a cfq-iosched: get ... |
432 |
CFQ_CFQQ_FNS(sync); |
a36e71f99 cfq-iosched: add ... |
433 |
CFQ_CFQQ_FNS(coop); |
ae54abed6 cfq-iosched: spli... |
434 |
CFQ_CFQQ_FNS(split_coop); |
76280aff1 cfq-iosched: idli... |
435 |
CFQ_CFQQ_FNS(deep); |
f75edf2dc blkio: Wait for c... |
436 |
CFQ_CFQQ_FNS(wait_busy); |
3b18152c3 [PATCH] CFQ io sc... |
437 |
#undef CFQ_CFQQ_FNS |
629ed0b10 blkcg: move stati... |
438 |
#if defined(CONFIG_CFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP) |
2ce4d50f9 cfq: collapse cfq... |
439 |
|
155fead9b blkcg: move blkio... |
440 441 442 443 444 |
/* cfqg stats flags */ enum cfqg_stats_flags { CFQG_stats_waiting = 0, CFQG_stats_idling, CFQG_stats_empty, |
629ed0b10 blkcg: move stati... |
445 |
}; |
155fead9b blkcg: move blkio... |
446 447 |
#define CFQG_FLAG_FNS(name) \ static inline void cfqg_stats_mark_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
448 |
{ \ |
155fead9b blkcg: move blkio... |
449 |
stats->flags |= (1 << CFQG_stats_##name); \ |
629ed0b10 blkcg: move stati... |
450 |
} \ |
155fead9b blkcg: move blkio... |
451 |
static inline void cfqg_stats_clear_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
452 |
{ \ |
155fead9b blkcg: move blkio... |
453 |
stats->flags &= ~(1 << CFQG_stats_##name); \ |
629ed0b10 blkcg: move stati... |
454 |
} \ |
155fead9b blkcg: move blkio... |
455 |
static inline int cfqg_stats_##name(struct cfqg_stats *stats) \ |
629ed0b10 blkcg: move stati... |
456 |
{ \ |
155fead9b blkcg: move blkio... |
457 |
return (stats->flags & (1 << CFQG_stats_##name)) != 0; \ |
629ed0b10 blkcg: move stati... |
458 |
} \ |
155fead9b blkcg: move blkio... |
459 460 461 462 |
CFQG_FLAG_FNS(waiting) CFQG_FLAG_FNS(idling) CFQG_FLAG_FNS(empty) #undef CFQG_FLAG_FNS |
629ed0b10 blkcg: move stati... |
463 464 |
/* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
465 |
static void cfqg_stats_update_group_wait_time(struct cfqg_stats *stats) |
629ed0b10 blkcg: move stati... |
466 467 |
{ unsigned long long now; |
155fead9b blkcg: move blkio... |
468 |
if (!cfqg_stats_waiting(stats)) |
629ed0b10 blkcg: move stati... |
469 470 471 472 473 474 |
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... |
475 |
cfqg_stats_clear_waiting(stats); |
629ed0b10 blkcg: move stati... |
476 477 478 |
} /* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
479 480 |
static void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) |
629ed0b10 blkcg: move stati... |
481 |
{ |
155fead9b blkcg: move blkio... |
482 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
483 |
|
155fead9b blkcg: move blkio... |
484 |
if (cfqg_stats_waiting(stats)) |
629ed0b10 blkcg: move stati... |
485 |
return; |
155fead9b blkcg: move blkio... |
486 |
if (cfqg == curr_cfqg) |
629ed0b10 blkcg: move stati... |
487 |
return; |
155fead9b blkcg: move blkio... |
488 489 |
stats->start_group_wait_time = sched_clock(); cfqg_stats_mark_waiting(stats); |
629ed0b10 blkcg: move stati... |
490 491 492 |
} /* This should be called with the queue_lock held. */ |
155fead9b blkcg: move blkio... |
493 |
static void cfqg_stats_end_empty_time(struct cfqg_stats *stats) |
629ed0b10 blkcg: move stati... |
494 495 |
{ unsigned long long now; |
155fead9b blkcg: move blkio... |
496 |
if (!cfqg_stats_empty(stats)) |
629ed0b10 blkcg: move stati... |
497 498 499 500 501 502 |
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... |
503 |
cfqg_stats_clear_empty(stats); |
629ed0b10 blkcg: move stati... |
504 |
} |
155fead9b blkcg: move blkio... |
505 |
static void cfqg_stats_update_dequeue(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
506 |
{ |
155fead9b blkcg: move blkio... |
507 |
blkg_stat_add(&cfqg->stats.dequeue, 1); |
629ed0b10 blkcg: move stati... |
508 |
} |
155fead9b blkcg: move blkio... |
509 |
static void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
510 |
{ |
155fead9b blkcg: move blkio... |
511 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
512 |
|
4d5e80a76 blkcg: s/blkg_rws... |
513 |
if (blkg_rwstat_total(&stats->queued)) |
629ed0b10 blkcg: move stati... |
514 515 516 517 518 519 520 |
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... |
521 |
if (cfqg_stats_empty(stats)) |
629ed0b10 blkcg: move stati... |
522 523 524 |
return; stats->start_empty_time = sched_clock(); |
155fead9b blkcg: move blkio... |
525 |
cfqg_stats_mark_empty(stats); |
629ed0b10 blkcg: move stati... |
526 |
} |
155fead9b blkcg: move blkio... |
527 |
static void cfqg_stats_update_idle_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
528 |
{ |
155fead9b blkcg: move blkio... |
529 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
530 |
|
155fead9b blkcg: move blkio... |
531 |
if (cfqg_stats_idling(stats)) { |
629ed0b10 blkcg: move stati... |
532 533 534 535 536 |
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... |
537 |
cfqg_stats_clear_idling(stats); |
629ed0b10 blkcg: move stati... |
538 539 |
} } |
155fead9b blkcg: move blkio... |
540 |
static void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
541 |
{ |
155fead9b blkcg: move blkio... |
542 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
543 |
|
155fead9b blkcg: move blkio... |
544 |
BUG_ON(cfqg_stats_idling(stats)); |
629ed0b10 blkcg: move stati... |
545 546 |
stats->start_idle_time = sched_clock(); |
155fead9b blkcg: move blkio... |
547 |
cfqg_stats_mark_idling(stats); |
629ed0b10 blkcg: move stati... |
548 |
} |
155fead9b blkcg: move blkio... |
549 |
static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) |
629ed0b10 blkcg: move stati... |
550 |
{ |
155fead9b blkcg: move blkio... |
551 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
552 553 |
blkg_stat_add(&stats->avg_queue_size_sum, |
4d5e80a76 blkcg: s/blkg_rws... |
554 |
blkg_rwstat_total(&stats->queued)); |
629ed0b10 blkcg: move stati... |
555 |
blkg_stat_add(&stats->avg_queue_size_samples, 1); |
155fead9b blkcg: move blkio... |
556 |
cfqg_stats_update_group_wait_time(stats); |
629ed0b10 blkcg: move stati... |
557 558 559 |
} #else /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ |
f48ec1d78 cfq: fix build br... |
560 561 562 563 564 565 566 |
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... |
567 568 569 570 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */ #ifdef CONFIG_CFQ_GROUP_IOSCHED |
2ce4d50f9 cfq: collapse cfq... |
571 |
|
4ceab71b9 cfq-iosched: move... |
572 573 574 575 576 577 578 579 |
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... |
580 |
return cpd ? container_of(cpd, struct cfq_group_data, cpd) : NULL; |
4ceab71b9 cfq-iosched: move... |
581 582 583 584 585 586 |
} static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg) { return pd_to_blkg(&cfqg->pd); } |
ffea73fc7 block: blkcg_poli... |
587 588 589 590 591 592 |
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... |
593 594 595 596 |
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... |
597 |
static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) |
7918ffb5b cfq-iosched: impl... |
598 |
{ |
d02f7aa8d cfq-iosched: enab... |
599 |
struct blkcg_gq *pblkg = cfqg_to_blkg(cfqg)->parent; |
7918ffb5b cfq-iosched: impl... |
600 |
|
d02f7aa8d cfq-iosched: enab... |
601 |
return pblkg ? blkg_to_cfqg(pblkg) : NULL; |
7918ffb5b cfq-iosched: impl... |
602 |
} |
3984aa552 cfq-iosched: Allo... |
603 604 605 606 607 608 |
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... |
609 610 611 612 613 614 615 616 617 |
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... |
618 619 620 621 |
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \ char __pbuf[128]; \ \ blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf)); \ |
b226e5c41 cfq-iosched: Prin... |
622 623 624 |
blk_add_trace_msg((cfqd)->queue, "cfq%d%c%c %s " fmt, (cfqq)->pid, \ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ cfqq_type((cfqq)) == SYNC_NOIDLE_WORKLOAD ? 'N' : ' ',\ |
54e7ed12b blkcg: remove blk... |
625 626 627 628 629 630 631 632 633 |
__pbuf, ##args); \ } while (0) #define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \ char __pbuf[128]; \ \ blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf)); \ blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args); \ } while (0) |
2868ef7b3 blkio: Some debug... |
634 |
|
155fead9b blkcg: move blkio... |
635 |
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
63a4cc248 blkg_rwstat: sepa... |
636 637 |
struct cfq_group *curr_cfqg, int op, int op_flags) |
2ce4d50f9 cfq: collapse cfq... |
638 |
{ |
63a4cc248 blkg_rwstat: sepa... |
639 |
blkg_rwstat_add(&cfqg->stats.queued, op, op_flags, 1); |
155fead9b blkcg: move blkio... |
640 641 |
cfqg_stats_end_empty_time(&cfqg->stats); cfqg_stats_set_start_group_wait_time(cfqg, curr_cfqg); |
2ce4d50f9 cfq: collapse cfq... |
642 |
} |
155fead9b blkcg: move blkio... |
643 |
static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
9a7f38c42 cfq-iosched: Conv... |
644 |
uint64_t time, unsigned long unaccounted_time) |
2ce4d50f9 cfq: collapse cfq... |
645 |
{ |
155fead9b blkcg: move blkio... |
646 |
blkg_stat_add(&cfqg->stats.time, time); |
629ed0b10 blkcg: move stati... |
647 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
155fead9b blkcg: move blkio... |
648 |
blkg_stat_add(&cfqg->stats.unaccounted_time, unaccounted_time); |
629ed0b10 blkcg: move stati... |
649 |
#endif |
2ce4d50f9 cfq: collapse cfq... |
650 |
} |
63a4cc248 blkg_rwstat: sepa... |
651 652 |
static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int op, int op_flags) |
2ce4d50f9 cfq: collapse cfq... |
653 |
{ |
63a4cc248 blkg_rwstat: sepa... |
654 |
blkg_rwstat_add(&cfqg->stats.queued, op, op_flags, -1); |
2ce4d50f9 cfq: collapse cfq... |
655 |
} |
63a4cc248 blkg_rwstat: sepa... |
656 657 |
static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int op, int op_flags) |
2ce4d50f9 cfq: collapse cfq... |
658 |
{ |
63a4cc248 blkg_rwstat: sepa... |
659 |
blkg_rwstat_add(&cfqg->stats.merged, op, op_flags, 1); |
2ce4d50f9 cfq: collapse cfq... |
660 |
} |
155fead9b blkcg: move blkio... |
661 |
static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
63a4cc248 blkg_rwstat: sepa... |
662 663 |
uint64_t start_time, uint64_t io_start_time, int op, int op_flags) |
2ce4d50f9 cfq: collapse cfq... |
664 |
{ |
155fead9b blkcg: move blkio... |
665 |
struct cfqg_stats *stats = &cfqg->stats; |
629ed0b10 blkcg: move stati... |
666 |
unsigned long long now = sched_clock(); |
629ed0b10 blkcg: move stati... |
667 668 |
if (time_after64(now, io_start_time)) |
63a4cc248 blkg_rwstat: sepa... |
669 670 |
blkg_rwstat_add(&stats->service_time, op, op_flags, now - io_start_time); |
629ed0b10 blkcg: move stati... |
671 |
if (time_after64(io_start_time, start_time)) |
63a4cc248 blkg_rwstat: sepa... |
672 |
blkg_rwstat_add(&stats->wait_time, op, op_flags, |
629ed0b10 blkcg: move stati... |
673 |
io_start_time - start_time); |
2ce4d50f9 cfq: collapse cfq... |
674 |
} |
689665af4 cfq-iosched: sepa... |
675 676 |
/* @stats = 0 */ static void cfqg_stats_reset(struct cfqg_stats *stats) |
155fead9b blkcg: move blkio... |
677 |
{ |
155fead9b blkcg: move blkio... |
678 |
/* queued stats shouldn't be cleared */ |
155fead9b blkcg: move blkio... |
679 680 681 682 683 684 685 686 687 688 689 690 691 692 |
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... |
693 |
/* @to += @from */ |
e6269c445 blkcg: add blkg_[... |
694 |
static void cfqg_stats_add_aux(struct cfqg_stats *to, struct cfqg_stats *from) |
0b39920b5 cfq-iosched: coll... |
695 696 |
{ /* queued stats shouldn't be cleared */ |
e6269c445 blkcg: add blkg_[... |
697 698 699 700 |
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... |
701 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
e6269c445 blkcg: add blkg_[... |
702 703 704 705 706 707 708 |
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... |
709 710 711 712 |
#endif } /* |
e6269c445 blkcg: add blkg_[... |
713 |
* Transfer @cfqg's stats to its parent's aux counts so that the ancestors' |
0b39920b5 cfq-iosched: coll... |
714 715 716 717 718 719 720 721 722 723 724 |
* 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_[... |
725 |
cfqg_stats_add_aux(&parent->stats, &cfqg->stats); |
0b39920b5 cfq-iosched: coll... |
726 |
cfqg_stats_reset(&cfqg->stats); |
0b39920b5 cfq-iosched: coll... |
727 |
} |
eb7d8c07f cfq: fix cfqg ref... |
728 |
#else /* CONFIG_CFQ_GROUP_IOSCHED */ |
d02f7aa8d cfq-iosched: enab... |
729 |
static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) { return NULL; } |
3984aa552 cfq-iosched: Allo... |
730 731 732 733 734 |
static inline bool cfqg_is_descendant(struct cfq_group *cfqg, struct cfq_group *ancestor) { return true; } |
eb7d8c07f cfq: fix cfqg ref... |
735 736 |
static inline void cfqg_get(struct cfq_group *cfqg) { } static inline void cfqg_put(struct cfq_group *cfqg) { } |
7b679138b cfq-iosched: add ... |
737 |
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ |
b226e5c41 cfq-iosched: Prin... |
738 739 740 741 |
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... |
742 |
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0) |
eb7d8c07f cfq: fix cfqg ref... |
743 |
|
155fead9b blkcg: move blkio... |
744 |
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg, |
63a4cc248 blkg_rwstat: sepa... |
745 |
struct cfq_group *curr_cfqg, int op, int op_flags) { } |
155fead9b blkcg: move blkio... |
746 |
static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg, |
9a7f38c42 cfq-iosched: Conv... |
747 |
uint64_t time, unsigned long unaccounted_time) { } |
63a4cc248 blkg_rwstat: sepa... |
748 749 750 751 |
static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int op, int op_flags) { } static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int op, int op_flags) { } |
155fead9b blkcg: move blkio... |
752 |
static inline void cfqg_stats_update_completion(struct cfq_group *cfqg, |
63a4cc248 blkg_rwstat: sepa... |
753 754 |
uint64_t start_time, uint64_t io_start_time, int op, int op_flags) { } |
2ce4d50f9 cfq: collapse cfq... |
755 |
|
eb7d8c07f cfq: fix cfqg ref... |
756 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
7b679138b cfq-iosched: add ... |
757 758 |
#define cfq_log(cfqd, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) |
615f0259e blkio: Implement ... |
759 760 761 762 763 764 765 766 767 |
/* 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... |
768 769 770 |
static inline bool cfq_io_thinktime_big(struct cfq_data *cfqd, struct cfq_ttime *ttime, bool group_idle) { |
9a7f38c42 cfq-iosched: Conv... |
771 |
u64 slice; |
f5f2b6ceb CFQ: add think ti... |
772 773 774 775 776 777 778 779 |
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 ... |
780 |
|
02b35081f cfq-iosched: Do g... |
781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
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... |
795 |
static inline enum wl_class_t cfqq_class(struct cfq_queue *cfqq) |
c0324a020 cfq-iosched: reim... |
796 797 798 799 800 801 802 |
{ if (cfq_class_idle(cfqq)) return IDLE_WORKLOAD; if (cfq_class_rt(cfqq)) return RT_WORKLOAD; return BE_WORKLOAD; } |
718eee057 cfq-iosched: fair... |
803 804 805 806 807 808 809 810 811 |
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... |
812 |
static inline int cfq_group_busy_queues_wl(enum wl_class_t wl_class, |
58ff82f34 blkio: Implement ... |
813 814 |
struct cfq_data *cfqd, struct cfq_group *cfqg) |
c0324a020 cfq-iosched: reim... |
815 |
{ |
3bf10fea3 cfq-iosched: Prop... |
816 |
if (wl_class == IDLE_WORKLOAD) |
cdb16e8f7 blkio: Introduce ... |
817 |
return cfqg->service_tree_idle.count; |
c0324a020 cfq-iosched: reim... |
818 |
|
34b98d03b cfq-iosched: Rena... |
819 820 821 |
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... |
822 |
} |
f26bd1f0a blkio: Determine ... |
823 824 825 |
static inline int cfqg_busy_async_queues(struct cfq_data *cfqd, struct cfq_group *cfqg) { |
34b98d03b cfq-iosched: Rena... |
826 827 |
return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count; |
f26bd1f0a blkio: Determine ... |
828 |
} |
165125e1e [BLOCK] Get rid o... |
829 |
static void cfq_dispatch_insert(struct request_queue *, struct request *); |
4f85cb96d block: make block... |
830 |
static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync, |
2da8de0bb cfq-iosched: remo... |
831 |
struct cfq_io_cq *cic, struct bio *bio); |
91fac317a cfq-iosched: get ... |
832 |
|
c58698073 block, cfq: reorg... |
833 834 835 836 837 |
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 ... |
838 839 840 841 842 843 844 |
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... |
845 |
static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_cq *cic, bool is_sync) |
91fac317a cfq-iosched: get ... |
846 |
{ |
a6151c3a5 cfq-iosched: appl... |
847 |
return cic->cfqq[is_sync]; |
91fac317a cfq-iosched: get ... |
848 |
} |
c58698073 block, cfq: reorg... |
849 850 |
static inline void cic_set_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq, bool is_sync) |
91fac317a cfq-iosched: get ... |
851 |
{ |
a6151c3a5 cfq-iosched: appl... |
852 |
cic->cfqq[is_sync] = cfqq; |
91fac317a cfq-iosched: get ... |
853 |
} |
c58698073 block, cfq: reorg... |
854 |
static inline struct cfq_data *cic_to_cfqd(struct cfq_io_cq *cic) |
bca4b914b cfq-iosched: remo... |
855 |
{ |
c58698073 block, cfq: reorg... |
856 |
return cic->icq.q->elevator->elevator_data; |
bca4b914b cfq-iosched: remo... |
857 |
} |
91fac317a cfq-iosched: get ... |
858 859 860 861 |
/* * We regard a request as SYNC, if it's either a read or has the SYNC bit * set (in which case it could also be direct WRITE). */ |
a6151c3a5 cfq-iosched: appl... |
862 |
static inline bool cfq_bio_sync(struct bio *bio) |
91fac317a cfq-iosched: get ... |
863 |
{ |
7b6d91dae block: unify flag... |
864 |
return bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC); |
91fac317a cfq-iosched: get ... |
865 |
} |
1da177e4c Linux-2.6.12-rc2 |
866 |
|
1da177e4c Linux-2.6.12-rc2 |
867 |
/* |
99f95e528 [PATCH] cfq build... |
868 869 870 |
* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ |
23e018a1b block: get rid of... |
871 |
static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) |
99f95e528 [PATCH] cfq build... |
872 |
{ |
7b679138b cfq-iosched: add ... |
873 874 |
if (cfqd->busy_queues) { cfq_log(cfqd, "schedule dispatch"); |
59c3d45e4 block: remove 'q'... |
875 |
kblockd_schedule_work(&cfqd->unplug_work); |
7b679138b cfq-iosched: add ... |
876 |
} |
99f95e528 [PATCH] cfq build... |
877 |
} |
1da177e4c Linux-2.6.12-rc2 |
878 |
/* |
44f7c1606 cfq-iosched: defe... |
879 880 881 882 |
* 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... |
883 |
static inline u64 cfq_prio_slice(struct cfq_data *cfqd, bool sync, |
d9e7620e6 cfq-iosched: rewo... |
884 |
unsigned short prio) |
44f7c1606 cfq-iosched: defe... |
885 |
{ |
9a7f38c42 cfq-iosched: Conv... |
886 887 |
u64 base_slice = cfqd->cfq_slice[sync]; u64 slice = div_u64(base_slice, CFQ_SLICE_SCALE); |
44f7c1606 cfq-iosched: defe... |
888 |
|
d9e7620e6 cfq-iosched: rewo... |
889 |
WARN_ON(prio >= IOPRIO_BE_NR); |
9a7f38c42 cfq-iosched: Conv... |
890 |
return base_slice + (slice * (4 - prio)); |
d9e7620e6 cfq-iosched: rewo... |
891 |
} |
44f7c1606 cfq-iosched: defe... |
892 |
|
9a7f38c42 cfq-iosched: Conv... |
893 |
static inline u64 |
d9e7620e6 cfq-iosched: rewo... |
894 895 896 |
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... |
897 |
} |
1d3650f71 cfq-iosched: impl... |
898 899 900 901 902 903 904 905 906 907 908 909 |
/** * 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... |
910 |
static inline u64 cfqg_scale_charge(u64 charge, |
1d3650f71 cfq-iosched: impl... |
911 |
unsigned int vfraction) |
25bc6b077 blkio: Introduce ... |
912 |
{ |
1d3650f71 cfq-iosched: impl... |
913 |
u64 c = charge << CFQ_SERVICE_SHIFT; /* make it fixed point */ |
25bc6b077 blkio: Introduce ... |
914 |
|
1d3650f71 cfq-iosched: impl... |
915 916 |
/* charge / vfraction */ c <<= CFQ_SERVICE_SHIFT; |
9a7f38c42 cfq-iosched: Conv... |
917 |
return div_u64(c, vfraction); |
25bc6b077 blkio: Introduce ... |
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 |
} 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; } static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime) { s64 delta = (s64)(vdisktime - min_vdisktime); if (delta < 0) min_vdisktime = vdisktime; return min_vdisktime; } static void update_min_vdisktime(struct cfq_rb_root *st) { |
25bc6b077 blkio: Introduce ... |
940 |
struct cfq_group *cfqg; |
25bc6b077 blkio: Introduce ... |
941 942 |
if (st->left) { cfqg = rb_entry_cfqg(st->left); |
a60327107 cfq-iosched: Fix ... |
943 944 |
st->min_vdisktime = max_vdisktime(st->min_vdisktime, cfqg->vdisktime); |
25bc6b077 blkio: Introduce ... |
945 |
} |
25bc6b077 blkio: Introduce ... |
946 |
} |
5db5d6427 cfq-iosched: adap... |
947 948 949 950 951 |
/* * 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 ... |
952 953 |
static inline unsigned cfq_group_get_avg_queues(struct cfq_data *cfqd, struct cfq_group *cfqg, bool rt) |
5869619cb cfq-iosched: fix ... |
954 |
{ |
5db5d6427 cfq-iosched: adap... |
955 956 957 |
unsigned min_q, max_q; unsigned mult = cfq_hist_divisor - 1; unsigned round = cfq_hist_divisor / 2; |
58ff82f34 blkio: Implement ... |
958 |
unsigned busy = cfq_group_busy_queues_wl(rt, cfqd, cfqg); |
5db5d6427 cfq-iosched: adap... |
959 |
|
58ff82f34 blkio: Implement ... |
960 961 962 |
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... |
963 |
cfq_hist_divisor; |
58ff82f34 blkio: Implement ... |
964 965 |
return cfqg->busy_queues_avg[rt]; } |
9a7f38c42 cfq-iosched: Conv... |
966 |
static inline u64 |
58ff82f34 blkio: Implement ... |
967 968 |
cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) { |
41cad6ab2 cfq-iosched: conv... |
969 |
return cfqd->cfq_target_latency * cfqg->vfraction >> CFQ_SERVICE_SHIFT; |
5db5d6427 cfq-iosched: adap... |
970 |
} |
9a7f38c42 cfq-iosched: Conv... |
971 |
static inline u64 |
ba5bd520f cfq: rename a fun... |
972 |
cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
973 |
{ |
9a7f38c42 cfq-iosched: Conv... |
974 |
u64 slice = cfq_prio_to_slice(cfqd, cfqq); |
5db5d6427 cfq-iosched: adap... |
975 |
if (cfqd->cfq_latency) { |
58ff82f34 blkio: Implement ... |
976 977 978 979 980 981 |
/* * 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... |
982 983 984 |
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 ... |
985 986 |
if (expect_latency > group_slice) { |
9a7f38c42 cfq-iosched: Conv... |
987 988 |
u64 base_low_slice = 2 * cfqd->cfq_slice_idle; u64 low_slice; |
5db5d6427 cfq-iosched: adap... |
989 990 |
/* scale low_slice according to IO priority * and sync vs async */ |
9a7f38c42 cfq-iosched: Conv... |
991 992 |
low_slice = div64_u64(base_low_slice*slice, sync_slice); low_slice = min(slice, low_slice); |
5db5d6427 cfq-iosched: adap... |
993 994 |
/* the adapted slice value is scaled to fit all iqs * into the target latency */ |
9a7f38c42 cfq-iosched: Conv... |
995 996 |
slice = div64_u64(slice*group_slice, expect_latency); slice = max(slice, low_slice); |
5db5d6427 cfq-iosched: adap... |
997 998 |
} } |
c553f8e33 block cfq: compen... |
999 1000 1001 1002 1003 1004 |
return slice; } static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
9a7f38c42 cfq-iosched: Conv... |
1005 1006 |
u64 slice = cfq_scaled_cfqq_slice(cfqd, cfqq); u64 now = ktime_get_ns(); |
c553f8e33 block cfq: compen... |
1007 |
|
9a7f38c42 cfq-iosched: Conv... |
1008 1009 |
cfqq->slice_start = now; cfqq->slice_end = now + slice; |
f75edf2dc blkio: Wait for c... |
1010 |
cfqq->allocated_slice = slice; |
9a7f38c42 cfq-iosched: Conv... |
1011 |
cfq_log_cfqq(cfqd, cfqq, "set_slice=%llu", cfqq->slice_end - now); |
44f7c1606 cfq-iosched: defe... |
1012 1013 1014 1015 1016 1017 1018 |
} /* * 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... |
1019 |
static inline bool cfq_slice_used(struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
1020 1021 |
{ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
1022 |
return false; |
9a7f38c42 cfq-iosched: Conv... |
1023 |
if (ktime_get_ns() < cfqq->slice_end) |
c1e44756f cfq-iosched: do c... |
1024 |
return false; |
44f7c1606 cfq-iosched: defe... |
1025 |
|
c1e44756f cfq-iosched: do c... |
1026 |
return true; |
44f7c1606 cfq-iosched: defe... |
1027 1028 1029 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
1030 |
* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
1da177e4c Linux-2.6.12-rc2 |
1031 |
* We choose the request that is closest to the head right now. Distance |
e8a99053e [PATCH] cfq-iosch... |
1032 |
* behind the head is penalized and only allowed to a certain extent. |
1da177e4c Linux-2.6.12-rc2 |
1033 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
1034 |
static struct request * |
cf7c25cf9 cfq-iosched: fix ... |
1035 |
cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, sector_t last) |
1da177e4c Linux-2.6.12-rc2 |
1036 |
{ |
cf7c25cf9 cfq-iosched: fix ... |
1037 |
sector_t s1, s2, d1 = 0, d2 = 0; |
1da177e4c Linux-2.6.12-rc2 |
1038 |
unsigned long back_max; |
e8a99053e [PATCH] cfq-iosch... |
1039 1040 1041 |
#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 |
1042 |
|
5e7053747 [PATCH] cfq-iosch... |
1043 1044 1045 1046 |
if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
9c2c38a12 [PATCH] cfq-iosch... |
1047 |
|
229836bd6 cfq-iosched: redu... |
1048 1049 |
if (rq_is_sync(rq1) != rq_is_sync(rq2)) return rq_is_sync(rq1) ? rq1 : rq2; |
65299a3b7 block: separate p... |
1050 1051 |
if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_PRIO) return rq1->cmd_flags & REQ_PRIO ? rq1 : rq2; |
b53d1ed73 Revert "cfq: Remo... |
1052 |
|
83096ebf1 block: convert to... |
1053 1054 |
s1 = blk_rq_pos(rq1); s2 = blk_rq_pos(rq2); |
1da177e4c Linux-2.6.12-rc2 |
1055 |
|
1da177e4c Linux-2.6.12-rc2 |
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 |
/* * 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... |
1071 |
wrap |= CFQ_RQ1_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
1072 1073 1074 1075 1076 1077 |
if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
1078 |
wrap |= CFQ_RQ2_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
1079 1080 |
/* Found required data */ |
e8a99053e [PATCH] cfq-iosch... |
1081 1082 1083 1084 1085 1086 |
/* * 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... |
1087 |
case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
1088 |
if (d1 < d2) |
5e7053747 [PATCH] cfq-iosch... |
1089 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1090 |
else if (d2 < d1) |
5e7053747 [PATCH] cfq-iosch... |
1091 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
1092 1093 |
else { if (s1 >= s2) |
5e7053747 [PATCH] cfq-iosch... |
1094 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1095 |
else |
5e7053747 [PATCH] cfq-iosch... |
1096 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
1097 |
} |
1da177e4c Linux-2.6.12-rc2 |
1098 |
|
e8a99053e [PATCH] cfq-iosch... |
1099 |
case CFQ_RQ2_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
1100 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
1101 |
case CFQ_RQ1_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
1102 1103 |
return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
1104 1105 1106 1107 1108 1109 1110 1111 |
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... |
1112 |
return rq1; |
1da177e4c Linux-2.6.12-rc2 |
1113 |
else |
5e7053747 [PATCH] cfq-iosch... |
1114 |
return rq2; |
1da177e4c Linux-2.6.12-rc2 |
1115 1116 |
} } |
498d3aa2b [PATCH] cfq-iosch... |
1117 1118 1119 |
/* * The below is leftmost cache rbtree addon */ |
0871714e0 cfq-iosched: rela... |
1120 |
static struct cfq_queue *cfq_rb_first(struct cfq_rb_root *root) |
cc09e2990 [PATCH] cfq-iosch... |
1121 |
{ |
615f0259e blkio: Implement ... |
1122 1123 1124 |
/* Service tree is empty */ if (!root->count) return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
1125 1126 |
if (!root->left) root->left = rb_first(&root->rb); |
0871714e0 cfq-iosched: rela... |
1127 1128 1129 1130 |
if (root->left) return rb_entry(root->left, struct cfq_queue, rb_node); return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
1131 |
} |
1fa8f6d68 blkio: Introduce ... |
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
static struct cfq_group *cfq_rb_first_group(struct cfq_rb_root *root) { if (!root->left) root->left = rb_first(&root->rb); if (root->left) return rb_entry_cfqg(root->left); return NULL; } |
a36e71f99 cfq-iosched: add ... |
1142 1143 1144 1145 1146 |
static void rb_erase_init(struct rb_node *n, struct rb_root *root) { rb_erase(n, root); RB_CLEAR_NODE(n); } |
cc09e2990 [PATCH] cfq-iosch... |
1147 1148 1149 1150 |
static void cfq_rb_erase(struct rb_node *n, struct cfq_rb_root *root) { if (root->left == n) root->left = NULL; |
a36e71f99 cfq-iosched: add ... |
1151 |
rb_erase_init(n, &root->rb); |
aa6f6a3de cfq-iosched: prep... |
1152 |
--root->count; |
cc09e2990 [PATCH] cfq-iosch... |
1153 |
} |
1da177e4c Linux-2.6.12-rc2 |
1154 1155 1156 |
/* * would be nice to take fifo expire time into account as well */ |
5e7053747 [PATCH] cfq-iosch... |
1157 1158 1159 |
static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
1da177e4c Linux-2.6.12-rc2 |
1160 |
{ |
21183b07e [PATCH] cfq-iosch... |
1161 1162 |
struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
5e7053747 [PATCH] cfq-iosch... |
1163 |
struct request *next = NULL, *prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1164 |
|
21183b07e [PATCH] cfq-iosch... |
1165 |
BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 |
if (rbprev) |
5e7053747 [PATCH] cfq-iosch... |
1168 |
prev = rb_entry_rq(rbprev); |
1da177e4c Linux-2.6.12-rc2 |
1169 |
|
21183b07e [PATCH] cfq-iosch... |
1170 |
if (rbnext) |
5e7053747 [PATCH] cfq-iosch... |
1171 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
1172 1173 1174 |
else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
5e7053747 [PATCH] cfq-iosch... |
1175 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
1176 |
} |
1da177e4c Linux-2.6.12-rc2 |
1177 |
|
cf7c25cf9 cfq-iosched: fix ... |
1178 |
return cfq_choose_req(cfqd, next, prev, blk_rq_pos(last)); |
1da177e4c Linux-2.6.12-rc2 |
1179 |
} |
9a7f38c42 cfq-iosched: Conv... |
1180 1181 |
static u64 cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1182 |
{ |
d9e7620e6 cfq-iosched: rewo... |
1183 1184 1185 |
/* * just an approximation, should be ok. */ |
cdb16e8f7 blkio: Introduce ... |
1186 |
return (cfqq->cfqg->nr_cfqq - 1) * (cfq_prio_slice(cfqd, 1, 0) - |
464191c65 Revert "cfq: Make... |
1187 |
cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
d9e7620e6 cfq-iosched: rewo... |
1188 |
} |
1fa8f6d68 blkio: Introduce ... |
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 |
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) { struct rb_node **node = &st->rb.rb_node; struct rb_node *parent = NULL; struct cfq_group *__cfqg; s64 key = cfqg_key(st, cfqg); int left = 1; while (*node != NULL) { parent = *node; __cfqg = rb_entry_cfqg(parent); if (key < cfqg_key(st, __cfqg)) node = &parent->rb_left; else { node = &parent->rb_right; left = 0; } } if (left) st->left = &cfqg->rb_node; rb_link_node(&cfqg->rb_node, parent, node); rb_insert_color(&cfqg->rb_node, &st->rb); } |
7b5af5cff cfq-iosched: Add ... |
1222 1223 1224 |
/* * This has to be called only on activation of cfqg */ |
1fa8f6d68 blkio: Introduce ... |
1225 |
static void |
8184f93ec cfq-iosched: Don'... |
1226 1227 |
cfq_update_group_weight(struct cfq_group *cfqg) { |
3381cb8d2 blkcg: move blkio... |
1228 |
if (cfqg->new_weight) { |
8184f93ec cfq-iosched: Don'... |
1229 |
cfqg->weight = cfqg->new_weight; |
3381cb8d2 blkcg: move blkio... |
1230 |
cfqg->new_weight = 0; |
8184f93ec cfq-iosched: Don'... |
1231 |
} |
e15693ef1 cfq-iosched: Fix ... |
1232 1233 1234 1235 1236 1237 |
} static void cfq_update_group_leaf_weight(struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
e71357e11 cfq-iosched: add ... |
1238 1239 1240 1241 1242 |
if (cfqg->new_leaf_weight) { cfqg->leaf_weight = cfqg->new_leaf_weight; cfqg->new_leaf_weight = 0; } |
8184f93ec cfq-iosched: Don'... |
1243 1244 1245 1246 1247 |
} static void cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { |
1d3650f71 cfq-iosched: impl... |
1248 |
unsigned int vfr = 1 << CFQ_SERVICE_SHIFT; /* start with 1 */ |
7918ffb5b cfq-iosched: impl... |
1249 |
struct cfq_group *pos = cfqg; |
1d3650f71 cfq-iosched: impl... |
1250 |
struct cfq_group *parent; |
7918ffb5b cfq-iosched: impl... |
1251 1252 1253 |
bool propagate; /* add to the service tree */ |
8184f93ec cfq-iosched: Don'... |
1254 |
BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); |
7b5af5cff cfq-iosched: Add ... |
1255 1256 1257 1258 1259 |
/* * 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 ... |
1260 |
cfq_update_group_leaf_weight(cfqg); |
8184f93ec cfq-iosched: Don'... |
1261 |
__cfq_group_service_tree_add(st, cfqg); |
7918ffb5b cfq-iosched: impl... |
1262 1263 |
/* |
1d3650f71 cfq-iosched: impl... |
1264 1265 1266 1267 1268 1269 1270 |
* 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... |
1271 1272 1273 |
*/ propagate = !pos->nr_active++; pos->children_weight += pos->leaf_weight; |
1d3650f71 cfq-iosched: impl... |
1274 |
vfr = vfr * pos->leaf_weight / pos->children_weight; |
7918ffb5b cfq-iosched: impl... |
1275 |
|
1d3650f71 cfq-iosched: impl... |
1276 1277 1278 1279 1280 1281 |
/* * 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... |
1282 |
while ((parent = cfqg_parent(pos))) { |
1d3650f71 cfq-iosched: impl... |
1283 |
if (propagate) { |
e15693ef1 cfq-iosched: Fix ... |
1284 |
cfq_update_group_weight(pos); |
1d3650f71 cfq-iosched: impl... |
1285 1286 1287 1288 |
propagate = !parent->nr_active++; parent->children_weight += pos->weight; } vfr = vfr * pos->weight / parent->children_weight; |
7918ffb5b cfq-iosched: impl... |
1289 1290 |
pos = parent; } |
1d3650f71 cfq-iosched: impl... |
1291 1292 |
cfqg->vfraction = max_t(unsigned, vfr, 1); |
8184f93ec cfq-iosched: Don'... |
1293 1294 1295 1296 |
} static void cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
1297 1298 1299 1300 1301 1302 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; struct cfq_group *__cfqg; struct rb_node *n; cfqg->nr_cfqq++; |
760701bfe cfq-iosched: Get ... |
1303 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
1fa8f6d68 blkio: Introduce ... |
1304 1305 1306 1307 1308 |
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... |
1309 |
* if group does not loose all if it was not continuously backlogged. |
1fa8f6d68 blkio: Introduce ... |
1310 1311 1312 1313 1314 1315 1316 |
*/ n = rb_last(&st->rb); if (n) { __cfqg = rb_entry_cfqg(n); cfqg->vdisktime = __cfqg->vdisktime + CFQ_IDLE_DELAY; } else cfqg->vdisktime = st->min_vdisktime; |
8184f93ec cfq-iosched: Don'... |
1317 1318 |
cfq_group_service_tree_add(st, cfqg); } |
1fa8f6d68 blkio: Introduce ... |
1319 |
|
8184f93ec cfq-iosched: Don'... |
1320 1321 1322 |
static void cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) { |
7918ffb5b cfq-iosched: impl... |
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 |
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... |
1334 |
struct cfq_group *parent = cfqg_parent(pos); |
7918ffb5b cfq-iosched: impl... |
1335 1336 1337 |
/* @pos has 0 nr_active at this point */ WARN_ON_ONCE(pos->children_weight); |
1d3650f71 cfq-iosched: impl... |
1338 |
pos->vfraction = 0; |
7918ffb5b cfq-iosched: impl... |
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 |
if (!parent) break; propagate = !--parent->nr_active; parent->children_weight -= pos->weight; pos = parent; } /* remove from the service tree */ |
8184f93ec cfq-iosched: Don'... |
1349 1350 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) cfq_rb_erase(&cfqg->rb_node, st); |
1fa8f6d68 blkio: Introduce ... |
1351 1352 1353 |
} static void |
8184f93ec cfq-iosched: Don'... |
1354 |
cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
1355 1356 1357 1358 1359 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; BUG_ON(cfqg->nr_cfqq < 1); cfqg->nr_cfqq--; |
25bc6b077 blkio: Introduce ... |
1360 |
|
1fa8f6d68 blkio: Introduce ... |
1361 1362 1363 |
/* If there are other cfq queues under this group, don't delete it */ if (cfqg->nr_cfqq) return; |
2868ef7b3 blkio: Some debug... |
1364 |
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group"); |
8184f93ec cfq-iosched: Don'... |
1365 |
cfq_group_service_tree_del(st, cfqg); |
4d2ceea4c cfq-iosched: More... |
1366 |
cfqg->saved_wl_slice = 0; |
155fead9b blkcg: move blkio... |
1367 |
cfqg_stats_update_dequeue(cfqg); |
dae739ebc blkio: Group time... |
1368 |
} |
9a7f38c42 cfq-iosched: Conv... |
1369 1370 |
static inline u64 cfq_cfqq_slice_usage(struct cfq_queue *cfqq, u64 *unaccounted_time) |
dae739ebc blkio: Group time... |
1371 |
{ |
9a7f38c42 cfq-iosched: Conv... |
1372 1373 |
u64 slice_used; u64 now = ktime_get_ns(); |
dae739ebc blkio: Group time... |
1374 1375 1376 1377 1378 |
/* * Queue got expired before even a single request completed or * got expired immediately after first request completion. */ |
9a7f38c42 cfq-iosched: Conv... |
1379 |
if (!cfqq->slice_start || cfqq->slice_start == now) { |
dae739ebc blkio: Group time... |
1380 1381 1382 1383 1384 1385 |
/* * 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... |
1386 1387 |
slice_used = max_t(u64, (now - cfqq->dispatch_start), jiffies_to_nsecs(1)); |
dae739ebc blkio: Group time... |
1388 |
} else { |
9a7f38c42 cfq-iosched: Conv... |
1389 |
slice_used = now - cfqq->slice_start; |
167400d34 blk-cgroup: Add u... |
1390 1391 |
if (slice_used > cfqq->allocated_slice) { *unaccounted_time = slice_used - cfqq->allocated_slice; |
f75edf2dc blkio: Wait for c... |
1392 |
slice_used = cfqq->allocated_slice; |
167400d34 blk-cgroup: Add u... |
1393 |
} |
9a7f38c42 cfq-iosched: Conv... |
1394 |
if (cfqq->slice_start > cfqq->dispatch_start) |
167400d34 blk-cgroup: Add u... |
1395 1396 |
*unaccounted_time += cfqq->slice_start - cfqq->dispatch_start; |
dae739ebc blkio: Group time... |
1397 |
} |
dae739ebc blkio: Group time... |
1398 1399 1400 1401 |
return slice_used; } static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, |
e5ff082e8 blkio: Fix anothe... |
1402 |
struct cfq_queue *cfqq) |
dae739ebc blkio: Group time... |
1403 1404 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; |
9a7f38c42 cfq-iosched: Conv... |
1405 |
u64 used_sl, charge, unaccounted_sl = 0; |
f26bd1f0a blkio: Determine ... |
1406 1407 |
int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg) - cfqg->service_tree_idle.count; |
1d3650f71 cfq-iosched: impl... |
1408 |
unsigned int vfr; |
9a7f38c42 cfq-iosched: Conv... |
1409 |
u64 now = ktime_get_ns(); |
f26bd1f0a blkio: Determine ... |
1410 1411 |
BUG_ON(nr_sync < 0); |
167400d34 blk-cgroup: Add u... |
1412 |
used_sl = charge = cfq_cfqq_slice_usage(cfqq, &unaccounted_sl); |
dae739ebc blkio: Group time... |
1413 |
|
02b35081f cfq-iosched: Do g... |
1414 1415 1416 1417 |
if (iops_mode(cfqd)) charge = cfqq->slice_dispatch; else if (!cfq_cfqq_sync(cfqq) && !nr_sync) charge = cfqq->allocated_slice; |
dae739ebc blkio: Group time... |
1418 |
|
1d3650f71 cfq-iosched: impl... |
1419 1420 1421 1422 1423 1424 1425 |
/* * 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'... |
1426 |
cfq_group_service_tree_del(st, cfqg); |
1d3650f71 cfq-iosched: impl... |
1427 |
cfqg->vdisktime += cfqg_scale_charge(charge, vfr); |
8184f93ec cfq-iosched: Don'... |
1428 |
cfq_group_service_tree_add(st, cfqg); |
dae739ebc blkio: Group time... |
1429 1430 |
/* This group is being expired. Save the context */ |
9a7f38c42 cfq-iosched: Conv... |
1431 1432 |
if (cfqd->workload_expires > now) { cfqg->saved_wl_slice = cfqd->workload_expires - now; |
4d2ceea4c cfq-iosched: More... |
1433 1434 |
cfqg->saved_wl_type = cfqd->serving_wl_type; cfqg->saved_wl_class = cfqd->serving_wl_class; |
dae739ebc blkio: Group time... |
1435 |
} else |
4d2ceea4c cfq-iosched: More... |
1436 |
cfqg->saved_wl_slice = 0; |
2868ef7b3 blkio: Some debug... |
1437 1438 1439 |
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, st->min_vdisktime); |
fd16d2631 block: Add __attr... |
1440 |
cfq_log_cfqq(cfqq->cfqd, cfqq, |
9a7f38c42 cfq-iosched: Conv... |
1441 |
"sl_used=%llu disp=%llu charge=%llu iops=%u sect=%lu", |
fd16d2631 block: Add __attr... |
1442 1443 |
used_sl, cfqq->slice_dispatch, charge, iops_mode(cfqd), cfqq->nr_sectors); |
155fead9b blkcg: move blkio... |
1444 1445 |
cfqg_stats_update_timeslice_used(cfqg, used_sl, unaccounted_sl); cfqg_stats_set_start_empty_time(cfqg); |
1fa8f6d68 blkio: Introduce ... |
1446 |
} |
f51b802c1 blkcg: use the us... |
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 |
/** * 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... |
1462 |
cfqg->ttime.last_end_request = ktime_get_ns(); |
f51b802c1 blkcg: use the us... |
1463 |
} |
25fb5169d blkio: Dynamic cf... |
1464 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
69d7fde59 blkcg: use CGROUP... |
1465 1466 |
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... |
1467 |
static void cfqg_stats_exit(struct cfqg_stats *stats) |
90d3839b9 block: Use u64_st... |
1468 |
{ |
24bdb8ef0 blkcg: make blkcg... |
1469 1470 1471 1472 |
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... |
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 |
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... |
1487 |
if (blkg_rwstat_init(&stats->merged, gfp) || |
24bdb8ef0 blkcg: make blkcg... |
1488 1489 1490 |
blkg_rwstat_init(&stats->service_time, gfp) || blkg_rwstat_init(&stats->wait_time, gfp) || blkg_rwstat_init(&stats->queued, gfp) || |
24bdb8ef0 blkcg: make blkcg... |
1491 1492 |
blkg_stat_init(&stats->time, gfp)) goto err; |
90d3839b9 block: Use u64_st... |
1493 1494 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
24bdb8ef0 blkcg: make blkcg... |
1495 1496 1497 1498 1499 1500 1501 1502 |
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... |
1503 |
#endif |
24bdb8ef0 blkcg: make blkcg... |
1504 1505 1506 1507 |
return 0; err: cfqg_stats_exit(stats); return -ENOMEM; |
90d3839b9 block: Use u64_st... |
1508 |
} |
e4a9bde95 blkcg: replace bl... |
1509 1510 1511 1512 1513 1514 1515 1516 1517 |
static struct blkcg_policy_data *cfq_cpd_alloc(gfp_t gfp) { struct cfq_group_data *cgd; cgd = kzalloc(sizeof(*cgd), GFP_KERNEL); if (!cgd) return NULL; return &cgd->cpd; } |
814376483 blkcg: minor upda... |
1518 |
static void cfq_cpd_init(struct blkcg_policy_data *cpd) |
e48453c38 block, cgroup: im... |
1519 |
{ |
814376483 blkcg: minor upda... |
1520 |
struct cfq_group_data *cgd = cpd_to_cfqgd(cpd); |
9e10a130d cgroup: replace c... |
1521 |
unsigned int weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ? |
69d7fde59 blkcg: use CGROUP... |
1522 |
CGROUP_WEIGHT_DFL : CFQ_WEIGHT_LEGACY_DFL; |
e48453c38 block, cgroup: im... |
1523 |
|
69d7fde59 blkcg: use CGROUP... |
1524 1525 1526 1527 1528 |
if (cpd_to_blkcg(cpd) == &blkcg_root) weight *= 2; cgd->weight = weight; cgd->leaf_weight = weight; |
e48453c38 block, cgroup: im... |
1529 |
} |
e4a9bde95 blkcg: replace bl... |
1530 1531 1532 1533 |
static void cfq_cpd_free(struct blkcg_policy_data *cpd) { kfree(cpd_to_cfqgd(cpd)); } |
69d7fde59 blkcg: use CGROUP... |
1534 1535 1536 |
static void cfq_cpd_bind(struct blkcg_policy_data *cpd) { struct blkcg *blkcg = cpd_to_blkcg(cpd); |
9e10a130d cgroup: replace c... |
1537 |
bool on_dfl = cgroup_subsys_on_dfl(io_cgrp_subsys); |
69d7fde59 blkcg: use CGROUP... |
1538 1539 1540 1541 1542 1543 1544 1545 |
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... |
1546 1547 |
static struct blkg_policy_data *cfq_pd_alloc(gfp_t gfp, int node) { |
b2ce2643c blk-throttle: cle... |
1548 1549 1550 1551 1552 1553 1554 |
struct cfq_group *cfqg; cfqg = kzalloc_node(sizeof(*cfqg), gfp, node); if (!cfqg) return NULL; cfq_init_cfqg_base(cfqg); |
24bdb8ef0 blkcg: make blkcg... |
1555 1556 1557 1558 |
if (cfqg_stats_init(&cfqg->stats, gfp)) { kfree(cfqg); return NULL; } |
b2ce2643c blk-throttle: cle... |
1559 1560 |
return &cfqg->pd; |
001bea73e blkcg: replace bl... |
1561 |
} |
a9520cd6f blkcg: make blkcg... |
1562 |
static void cfq_pd_init(struct blkg_policy_data *pd) |
f469a7b4d blk-cgroup: Allow... |
1563 |
{ |
a9520cd6f blkcg: make blkcg... |
1564 1565 |
struct cfq_group *cfqg = pd_to_cfqg(pd); struct cfq_group_data *cgd = blkcg_to_cfqgd(pd->blkg->blkcg); |
25fb5169d blkio: Dynamic cf... |
1566 |
|
e48453c38 block, cgroup: im... |
1567 1568 |
cfqg->weight = cgd->weight; cfqg->leaf_weight = cgd->leaf_weight; |
25fb5169d blkio: Dynamic cf... |
1569 |
} |
a9520cd6f blkcg: make blkcg... |
1570 |
static void cfq_pd_offline(struct blkg_policy_data *pd) |
0b39920b5 cfq-iosched: coll... |
1571 |
{ |
a9520cd6f blkcg: make blkcg... |
1572 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
60a837077 cfq-iosched: char... |
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 |
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... |
1584 1585 1586 1587 1588 1589 |
/* * @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... |
1590 |
cfqg_stats_xfer_dead(cfqg); |
0b39920b5 cfq-iosched: coll... |
1591 |
} |
001bea73e blkcg: replace bl... |
1592 1593 |
static void cfq_pd_free(struct blkg_policy_data *pd) { |
24bdb8ef0 blkcg: make blkcg... |
1594 1595 1596 1597 |
struct cfq_group *cfqg = pd_to_cfqg(pd); cfqg_stats_exit(&cfqg->stats); return kfree(cfqg); |
001bea73e blkcg: replace bl... |
1598 |
} |
a9520cd6f blkcg: make blkcg... |
1599 |
static void cfq_pd_reset_stats(struct blkg_policy_data *pd) |
689665af4 cfq-iosched: sepa... |
1600 |
{ |
a9520cd6f blkcg: make blkcg... |
1601 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
689665af4 cfq-iosched: sepa... |
1602 1603 |
cfqg_stats_reset(&cfqg->stats); |
25fb5169d blkio: Dynamic cf... |
1604 |
} |
ae1188963 blkcg: consolidat... |
1605 1606 |
static struct cfq_group *cfq_lookup_cfqg(struct cfq_data *cfqd, struct blkcg *blkcg) |
25fb5169d blkio: Dynamic cf... |
1607 |
{ |
ae1188963 blkcg: consolidat... |
1608 |
struct blkcg_gq *blkg; |
f469a7b4d blk-cgroup: Allow... |
1609 |
|
ae1188963 blkcg: consolidat... |
1610 1611 1612 1613 |
blkg = blkg_lookup(blkcg, cfqd->queue); if (likely(blkg)) return blkg_to_cfqg(blkg); return NULL; |
25fb5169d blkio: Dynamic cf... |
1614 1615 1616 1617 |
} static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { |
25fb5169d blkio: Dynamic cf... |
1618 |
cfqq->cfqg = cfqg; |
b1c357696 blkio: Take care ... |
1619 |
/* cfqq reference on cfqg */ |
eb7d8c07f cfq: fix cfqg ref... |
1620 |
cfqg_get(cfqg); |
b1c357696 blkio: Take care ... |
1621 |
} |
f95a04afa blkcg: embed stru... |
1622 1623 |
static u64 cfqg_prfill_weight_device(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
60c2bc2d5 blkcg: move conf/... |
1624 |
{ |
f95a04afa blkcg: embed stru... |
1625 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
3381cb8d2 blkcg: move blkio... |
1626 1627 |
if (!cfqg->dev_weight) |
60c2bc2d5 blkcg: move conf/... |
1628 |
return 0; |
f95a04afa blkcg: embed stru... |
1629 |
return __blkg_prfill_u64(sf, pd, cfqg->dev_weight); |
60c2bc2d5 blkcg: move conf/... |
1630 |
} |
2da8ca822 cgroup: replace c... |
1631 |
static int cfqg_print_weight_device(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1632 |
{ |
2da8ca822 cgroup: replace c... |
1633 1634 1635 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_weight_device, &blkcg_policy_cfq, 0, false); |
60c2bc2d5 blkcg: move conf/... |
1636 1637 |
return 0; } |
e71357e11 cfq-iosched: add ... |
1638 1639 1640 1641 1642 1643 1644 1645 1646 |
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... |
1647 |
static int cfqg_print_leaf_weight_device(struct seq_file *sf, void *v) |
e71357e11 cfq-iosched: add ... |
1648 |
{ |
2da8ca822 cgroup: replace c... |
1649 1650 1651 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_leaf_weight_device, &blkcg_policy_cfq, 0, false); |
e71357e11 cfq-iosched: add ... |
1652 1653 |
return 0; } |
2da8ca822 cgroup: replace c... |
1654 |
static int cfq_print_weight(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1655 |
{ |
e48453c38 block, cgroup: im... |
1656 |
struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); |
9470e4a69 cfq-iosched: fix ... |
1657 1658 |
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg); unsigned int val = 0; |
e48453c38 block, cgroup: im... |
1659 |
|
9470e4a69 cfq-iosched: fix ... |
1660 1661 1662 1663 1664 |
if (cgd) val = cgd->weight; seq_printf(sf, "%u ", val); |
60c2bc2d5 blkcg: move conf/... |
1665 1666 |
return 0; } |
2da8ca822 cgroup: replace c... |
1667 |
static int cfq_print_leaf_weight(struct seq_file *sf, void *v) |
e71357e11 cfq-iosched: add ... |
1668 |
{ |
e48453c38 block, cgroup: im... |
1669 |
struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); |
9470e4a69 cfq-iosched: fix ... |
1670 1671 1672 1673 1674 |
struct cfq_group_data *cgd = blkcg_to_cfqgd(blkcg); unsigned int val = 0; if (cgd) val = cgd->leaf_weight; |
e48453c38 block, cgroup: im... |
1675 |
|
9470e4a69 cfq-iosched: fix ... |
1676 1677 |
seq_printf(sf, "%u ", val); |
e71357e11 cfq-iosched: add ... |
1678 1679 |
return 0; } |
451af504d cgroup: replace c... |
1680 1681 |
static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off, |
2ee867dcf blkcg: implement ... |
1682 |
bool on_dfl, bool is_leaf_weight) |
60c2bc2d5 blkcg: move conf/... |
1683 |
{ |
69d7fde59 blkcg: use CGROUP... |
1684 1685 |
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... |
1686 |
struct blkcg *blkcg = css_to_blkcg(of_css(of)); |
60c2bc2d5 blkcg: move conf/... |
1687 |
struct blkg_conf_ctx ctx; |
3381cb8d2 blkcg: move blkio... |
1688 |
struct cfq_group *cfqg; |
e48453c38 block, cgroup: im... |
1689 |
struct cfq_group_data *cfqgd; |
60c2bc2d5 blkcg: move conf/... |
1690 |
int ret; |
36aa9e5f5 blkcg: move body ... |
1691 |
u64 v; |
60c2bc2d5 blkcg: move conf/... |
1692 |
|
3c798398e blkcg: mass renam... |
1693 |
ret = blkg_conf_prep(blkcg, &blkcg_policy_cfq, buf, &ctx); |
60c2bc2d5 blkcg: move conf/... |
1694 1695 |
if (ret) return ret; |
2ee867dcf blkcg: implement ... |
1696 1697 1698 1699 1700 1701 1702 1703 1704 |
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 ... |
1705 |
goto out_finish; |
2ee867dcf blkcg: implement ... |
1706 |
} |
36aa9e5f5 blkcg: move body ... |
1707 |
|
3381cb8d2 blkcg: move blkio... |
1708 |
cfqg = blkg_to_cfqg(ctx.blkg); |
e48453c38 block, cgroup: im... |
1709 |
cfqgd = blkcg_to_cfqgd(blkcg); |
ae994ea97 cfq-iosched: fix ... |
1710 |
|
20386ce01 blkcg: refine err... |
1711 |
ret = -ERANGE; |
69d7fde59 blkcg: use CGROUP... |
1712 |
if (!v || (v >= min && v <= max)) { |
e71357e11 cfq-iosched: add ... |
1713 |
if (!is_leaf_weight) { |
36aa9e5f5 blkcg: move body ... |
1714 1715 |
cfqg->dev_weight = v; cfqg->new_weight = v ?: cfqgd->weight; |
e71357e11 cfq-iosched: add ... |
1716 |
} else { |
36aa9e5f5 blkcg: move body ... |
1717 1718 |
cfqg->dev_leaf_weight = v; cfqg->new_leaf_weight = v ?: cfqgd->leaf_weight; |
e71357e11 cfq-iosched: add ... |
1719 |
} |
60c2bc2d5 blkcg: move conf/... |
1720 1721 |
ret = 0; } |
36aa9e5f5 blkcg: move body ... |
1722 |
out_finish: |
60c2bc2d5 blkcg: move conf/... |
1723 |
blkg_conf_finish(&ctx); |
451af504d cgroup: replace c... |
1724 |
return ret ?: nbytes; |
60c2bc2d5 blkcg: move conf/... |
1725 |
} |
451af504d cgroup: replace c... |
1726 1727 |
static ssize_t cfqg_set_weight_device(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) |
e71357e11 cfq-iosched: add ... |
1728 |
{ |
2ee867dcf blkcg: implement ... |
1729 |
return __cfqg_set_weight_device(of, buf, nbytes, off, false, false); |
e71357e11 cfq-iosched: add ... |
1730 |
} |
451af504d cgroup: replace c... |
1731 1732 |
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 ... |
1733 |
{ |
2ee867dcf blkcg: implement ... |
1734 |
return __cfqg_set_weight_device(of, buf, nbytes, off, false, true); |
e71357e11 cfq-iosched: add ... |
1735 |
} |
dd165eb3b blkcg: misc prepa... |
1736 |
static int __cfq_set_weight(struct cgroup_subsys_state *css, u64 val, |
69d7fde59 blkcg: use CGROUP... |
1737 |
bool on_dfl, bool reset_dev, bool is_leaf_weight) |
60c2bc2d5 blkcg: move conf/... |
1738 |
{ |
69d7fde59 blkcg: use CGROUP... |
1739 1740 |
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... |
1741 |
struct blkcg *blkcg = css_to_blkcg(css); |
3c798398e blkcg: mass renam... |
1742 |
struct blkcg_gq *blkg; |
e48453c38 block, cgroup: im... |
1743 |
struct cfq_group_data *cfqgd; |
ae994ea97 cfq-iosched: fix ... |
1744 |
int ret = 0; |
60c2bc2d5 blkcg: move conf/... |
1745 |
|
69d7fde59 blkcg: use CGROUP... |
1746 1747 |
if (val < min || val > max) return -ERANGE; |
60c2bc2d5 blkcg: move conf/... |
1748 1749 |
spin_lock_irq(&blkcg->lock); |
e48453c38 block, cgroup: im... |
1750 |
cfqgd = blkcg_to_cfqgd(blkcg); |
ae994ea97 cfq-iosched: fix ... |
1751 1752 1753 1754 |
if (!cfqgd) { ret = -EINVAL; goto out; } |
e71357e11 cfq-iosched: add ... |
1755 1756 |
if (!is_leaf_weight) |
e48453c38 block, cgroup: im... |
1757 |
cfqgd->weight = val; |
e71357e11 cfq-iosched: add ... |
1758 |
else |
e48453c38 block, cgroup: im... |
1759 |
cfqgd->leaf_weight = val; |
60c2bc2d5 blkcg: move conf/... |
1760 |
|
b67bfe0d4 hlist: drop the n... |
1761 |
hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { |
3381cb8d2 blkcg: move blkio... |
1762 |
struct cfq_group *cfqg = blkg_to_cfqg(blkg); |
60c2bc2d5 blkcg: move conf/... |
1763 |
|
e71357e11 cfq-iosched: add ... |
1764 1765 1766 1767 |
if (!cfqg) continue; if (!is_leaf_weight) { |
69d7fde59 blkcg: use CGROUP... |
1768 1769 |
if (reset_dev) cfqg->dev_weight = 0; |
e71357e11 cfq-iosched: add ... |
1770 |
if (!cfqg->dev_weight) |
e48453c38 block, cgroup: im... |
1771 |
cfqg->new_weight = cfqgd->weight; |
e71357e11 cfq-iosched: add ... |
1772 |
} else { |
69d7fde59 blkcg: use CGROUP... |
1773 1774 |
if (reset_dev) cfqg->dev_leaf_weight = 0; |
e71357e11 cfq-iosched: add ... |
1775 |
if (!cfqg->dev_leaf_weight) |
e48453c38 block, cgroup: im... |
1776 |
cfqg->new_leaf_weight = cfqgd->leaf_weight; |
e71357e11 cfq-iosched: add ... |
1777 |
} |
60c2bc2d5 blkcg: move conf/... |
1778 |
} |
ae994ea97 cfq-iosched: fix ... |
1779 |
out: |
60c2bc2d5 blkcg: move conf/... |
1780 |
spin_unlock_irq(&blkcg->lock); |
ae994ea97 cfq-iosched: fix ... |
1781 |
return ret; |
60c2bc2d5 blkcg: move conf/... |
1782 |
} |
182446d08 cgroup: pass arou... |
1783 1784 |
static int cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft, u64 val) |
e71357e11 cfq-iosched: add ... |
1785 |
{ |
69d7fde59 blkcg: use CGROUP... |
1786 |
return __cfq_set_weight(css, val, false, false, false); |
e71357e11 cfq-iosched: add ... |
1787 |
} |
182446d08 cgroup: pass arou... |
1788 1789 |
static int cfq_set_leaf_weight(struct cgroup_subsys_state *css, struct cftype *cft, u64 val) |
e71357e11 cfq-iosched: add ... |
1790 |
{ |
69d7fde59 blkcg: use CGROUP... |
1791 |
return __cfq_set_weight(css, val, false, false, true); |
e71357e11 cfq-iosched: add ... |
1792 |
} |
2da8ca822 cgroup: replace c... |
1793 |
static int cfqg_print_stat(struct seq_file *sf, void *v) |
5bc4afb1e blkcg: drop BLKCG... |
1794 |
{ |
2da8ca822 cgroup: replace c... |
1795 1796 |
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... |
1797 1798 |
return 0; } |
2da8ca822 cgroup: replace c... |
1799 |
static int cfqg_print_rwstat(struct seq_file *sf, void *v) |
5bc4afb1e blkcg: drop BLKCG... |
1800 |
{ |
2da8ca822 cgroup: replace c... |
1801 1802 |
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... |
1803 1804 |
return 0; } |
43114018c cfq-iosched: add ... |
1805 1806 1807 |
static u64 cfqg_prfill_stat_recursive(struct seq_file *sf, struct blkg_policy_data *pd, int off) { |
f12c74cab blkcg: make blkg_... |
1808 1809 |
u64 sum = blkg_stat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_cfq, off); |
43114018c cfq-iosched: add ... |
1810 1811 1812 1813 1814 1815 |
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_... |
1816 1817 |
struct blkg_rwstat sum = blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_cfq, off); |
43114018c cfq-iosched: add ... |
1818 1819 |
return __blkg_prfill_rwstat(sf, pd, &sum); } |
2da8ca822 cgroup: replace c... |
1820 |
static int cfqg_print_stat_recursive(struct seq_file *sf, void *v) |
43114018c cfq-iosched: add ... |
1821 |
{ |
2da8ca822 cgroup: replace c... |
1822 1823 1824 |
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 ... |
1825 1826 |
return 0; } |
2da8ca822 cgroup: replace c... |
1827 |
static int cfqg_print_rwstat_recursive(struct seq_file *sf, void *v) |
43114018c cfq-iosched: add ... |
1828 |
{ |
2da8ca822 cgroup: replace c... |
1829 1830 1831 |
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 ... |
1832 1833 |
return 0; } |
702747cab blkcg: remove cfq... |
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 |
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/... |
1867 |
#ifdef CONFIG_DEBUG_BLK_CGROUP |
f95a04afa blkcg: embed stru... |
1868 1869 |
static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf, struct blkg_policy_data *pd, int off) |
60c2bc2d5 blkcg: move conf/... |
1870 |
{ |
f95a04afa blkcg: embed stru... |
1871 |
struct cfq_group *cfqg = pd_to_cfqg(pd); |
155fead9b blkcg: move blkio... |
1872 |
u64 samples = blkg_stat_read(&cfqg->stats.avg_queue_size_samples); |
60c2bc2d5 blkcg: move conf/... |
1873 1874 1875 |
u64 v = 0; if (samples) { |
155fead9b blkcg: move blkio... |
1876 |
v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum); |
f3cff25f0 cfq: explicitly u... |
1877 |
v = div64_u64(v, samples); |
60c2bc2d5 blkcg: move conf/... |
1878 |
} |
f95a04afa blkcg: embed stru... |
1879 |
__blkg_prfill_u64(sf, pd, v); |
60c2bc2d5 blkcg: move conf/... |
1880 1881 1882 1883 |
return 0; } /* print avg_queue_size */ |
2da8ca822 cgroup: replace c... |
1884 |
static int cfqg_print_avg_queue_size(struct seq_file *sf, void *v) |
60c2bc2d5 blkcg: move conf/... |
1885 |
{ |
2da8ca822 cgroup: replace c... |
1886 1887 1888 |
blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), cfqg_prfill_avg_queue_size, &blkcg_policy_cfq, 0, false); |
60c2bc2d5 blkcg: move conf/... |
1889 1890 1891 |
return 0; } #endif /* CONFIG_DEBUG_BLK_CGROUP */ |
880f50e22 blkcg: mark exist... |
1892 |
static struct cftype cfq_blkcg_legacy_files[] = { |
1d3650f71 cfq-iosched: impl... |
1893 |
/* on root, weight is mapped to leaf_weight */ |
60c2bc2d5 blkcg: move conf/... |
1894 1895 |
{ .name = "weight_device", |
1d3650f71 cfq-iosched: impl... |
1896 |
.flags = CFTYPE_ONLY_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1897 |
.seq_show = cfqg_print_leaf_weight_device, |
451af504d cgroup: replace c... |
1898 |
.write = cfqg_set_leaf_weight_device, |
60c2bc2d5 blkcg: move conf/... |
1899 1900 1901 |
}, { .name = "weight", |
1d3650f71 cfq-iosched: impl... |
1902 |
.flags = CFTYPE_ONLY_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1903 |
.seq_show = cfq_print_leaf_weight, |
1d3650f71 cfq-iosched: impl... |
1904 |
.write_u64 = cfq_set_leaf_weight, |
60c2bc2d5 blkcg: move conf/... |
1905 |
}, |
e71357e11 cfq-iosched: add ... |
1906 |
|
1d3650f71 cfq-iosched: impl... |
1907 |
/* no such mapping necessary for !roots */ |
60c2bc2d5 blkcg: move conf/... |
1908 1909 |
{ .name = "weight_device", |
1d3650f71 cfq-iosched: impl... |
1910 |
.flags = CFTYPE_NOT_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1911 |
.seq_show = cfqg_print_weight_device, |
451af504d cgroup: replace c... |
1912 |
.write = cfqg_set_weight_device, |
60c2bc2d5 blkcg: move conf/... |
1913 1914 1915 |
}, { .name = "weight", |
1d3650f71 cfq-iosched: impl... |
1916 |
.flags = CFTYPE_NOT_ON_ROOT, |
2da8ca822 cgroup: replace c... |
1917 |
.seq_show = cfq_print_weight, |
3381cb8d2 blkcg: move blkio... |
1918 |
.write_u64 = cfq_set_weight, |
60c2bc2d5 blkcg: move conf/... |
1919 |
}, |
e71357e11 cfq-iosched: add ... |
1920 |
|
e71357e11 cfq-iosched: add ... |
1921 1922 |
{ .name = "leaf_weight_device", |
2da8ca822 cgroup: replace c... |
1923 |
.seq_show = cfqg_print_leaf_weight_device, |
451af504d cgroup: replace c... |
1924 |
.write = cfqg_set_leaf_weight_device, |
e71357e11 cfq-iosched: add ... |
1925 1926 1927 |
}, { .name = "leaf_weight", |
2da8ca822 cgroup: replace c... |
1928 |
.seq_show = cfq_print_leaf_weight, |
e71357e11 cfq-iosched: add ... |
1929 1930 |
.write_u64 = cfq_set_leaf_weight, }, |
43114018c cfq-iosched: add ... |
1931 |
/* statistics, covers only the tasks in the cfqg */ |
60c2bc2d5 blkcg: move conf/... |
1932 1933 |
{ .name = "time", |
5bc4afb1e blkcg: drop BLKCG... |
1934 |
.private = offsetof(struct cfq_group, stats.time), |
2da8ca822 cgroup: replace c... |
1935 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
1936 1937 1938 |
}, { .name = "sectors", |
702747cab blkcg: remove cfq... |
1939 |
.seq_show = cfqg_print_stat_sectors, |
60c2bc2d5 blkcg: move conf/... |
1940 1941 1942 |
}, { .name = "io_service_bytes", |
77ea73388 blkcg: move io_se... |
1943 1944 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_bytes, |
60c2bc2d5 blkcg: move conf/... |
1945 1946 1947 |
}, { .name = "io_serviced", |
77ea73388 blkcg: move io_se... |
1948 1949 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_ios, |
60c2bc2d5 blkcg: move conf/... |
1950 1951 1952 |
}, { .name = "io_service_time", |
5bc4afb1e blkcg: drop BLKCG... |
1953 |
.private = offsetof(struct cfq_group, stats.service_time), |
2da8ca822 cgroup: replace c... |
1954 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1955 1956 1957 |
}, { .name = "io_wait_time", |
5bc4afb1e blkcg: drop BLKCG... |
1958 |
.private = offsetof(struct cfq_group, stats.wait_time), |
2da8ca822 cgroup: replace c... |
1959 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1960 1961 1962 |
}, { .name = "io_merged", |
5bc4afb1e blkcg: drop BLKCG... |
1963 |
.private = offsetof(struct cfq_group, stats.merged), |
2da8ca822 cgroup: replace c... |
1964 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1965 1966 1967 |
}, { .name = "io_queued", |
5bc4afb1e blkcg: drop BLKCG... |
1968 |
.private = offsetof(struct cfq_group, stats.queued), |
2da8ca822 cgroup: replace c... |
1969 |
.seq_show = cfqg_print_rwstat, |
60c2bc2d5 blkcg: move conf/... |
1970 |
}, |
43114018c cfq-iosched: add ... |
1971 1972 1973 1974 1975 |
/* the same statictics which cover the cfqg and its descendants */ { .name = "time_recursive", .private = offsetof(struct cfq_group, stats.time), |
2da8ca822 cgroup: replace c... |
1976 |
.seq_show = cfqg_print_stat_recursive, |
43114018c cfq-iosched: add ... |
1977 1978 1979 |
}, { .name = "sectors_recursive", |
702747cab blkcg: remove cfq... |
1980 |
.seq_show = cfqg_print_stat_sectors_recursive, |
43114018c cfq-iosched: add ... |
1981 1982 1983 |
}, { .name = "io_service_bytes_recursive", |
77ea73388 blkcg: move io_se... |
1984 1985 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_bytes_recursive, |
43114018c cfq-iosched: add ... |
1986 1987 1988 |
}, { .name = "io_serviced_recursive", |
77ea73388 blkcg: move io_se... |
1989 1990 |
.private = (unsigned long)&blkcg_policy_cfq, .seq_show = blkg_print_stat_ios_recursive, |
43114018c cfq-iosched: add ... |
1991 1992 1993 1994 |
}, { .name = "io_service_time_recursive", .private = offsetof(struct cfq_group, stats.service_time), |
2da8ca822 cgroup: replace c... |
1995 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
1996 1997 1998 1999 |
}, { .name = "io_wait_time_recursive", .private = offsetof(struct cfq_group, stats.wait_time), |
2da8ca822 cgroup: replace c... |
2000 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
2001 2002 2003 2004 |
}, { .name = "io_merged_recursive", .private = offsetof(struct cfq_group, stats.merged), |
2da8ca822 cgroup: replace c... |
2005 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
2006 2007 2008 2009 |
}, { .name = "io_queued_recursive", .private = offsetof(struct cfq_group, stats.queued), |
2da8ca822 cgroup: replace c... |
2010 |
.seq_show = cfqg_print_rwstat_recursive, |
43114018c cfq-iosched: add ... |
2011 |
}, |
60c2bc2d5 blkcg: move conf/... |
2012 2013 2014 |
#ifdef CONFIG_DEBUG_BLK_CGROUP { .name = "avg_queue_size", |
2da8ca822 cgroup: replace c... |
2015 |
.seq_show = cfqg_print_avg_queue_size, |
60c2bc2d5 blkcg: move conf/... |
2016 2017 2018 |
}, { .name = "group_wait_time", |
5bc4afb1e blkcg: drop BLKCG... |
2019 |
.private = offsetof(struct cfq_group, stats.group_wait_time), |
2da8ca822 cgroup: replace c... |
2020 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2021 2022 2023 |
}, { .name = "idle_time", |
5bc4afb1e blkcg: drop BLKCG... |
2024 |
.private = offsetof(struct cfq_group, stats.idle_time), |
2da8ca822 cgroup: replace c... |
2025 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2026 2027 2028 |
}, { .name = "empty_time", |
5bc4afb1e blkcg: drop BLKCG... |
2029 |
.private = offsetof(struct cfq_group, stats.empty_time), |
2da8ca822 cgroup: replace c... |
2030 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2031 2032 2033 |
}, { .name = "dequeue", |
5bc4afb1e blkcg: drop BLKCG... |
2034 |
.private = offsetof(struct cfq_group, stats.dequeue), |
2da8ca822 cgroup: replace c... |
2035 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2036 2037 2038 |
}, { .name = "unaccounted_time", |
5bc4afb1e blkcg: drop BLKCG... |
2039 |
.private = offsetof(struct cfq_group, stats.unaccounted_time), |
2da8ca822 cgroup: replace c... |
2040 |
.seq_show = cfqg_print_stat, |
60c2bc2d5 blkcg: move conf/... |
2041 2042 2043 2044 |
}, #endif /* CONFIG_DEBUG_BLK_CGROUP */ { } /* terminate */ }; |
2ee867dcf blkcg: implement ... |
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 |
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... |
2070 |
ret = __cfq_set_weight(of_css(of), v, true, false, false); |
2ee867dcf blkcg: implement ... |
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 |
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... |
2087 |
#else /* GROUP_IOSCHED */ |
ae1188963 blkcg: consolidat... |
2088 2089 |
static struct cfq_group *cfq_lookup_cfqg(struct cfq_data *cfqd, struct blkcg *blkcg) |
25fb5169d blkio: Dynamic cf... |
2090 |
{ |
f51b802c1 blkcg: use the us... |
2091 |
return cfqd->root_group; |
25fb5169d blkio: Dynamic cf... |
2092 |
} |
7f1dc8a2d blkio: Fix blkio ... |
2093 |
|
25fb5169d blkio: Dynamic cf... |
2094 2095 2096 2097 2098 2099 |
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... |
2100 |
/* |
c0324a020 cfq-iosched: reim... |
2101 |
* The cfqd->service_trees holds all pending cfq_queue's that have |
498d3aa2b [PATCH] cfq-iosch... |
2102 2103 2104 |
* requests waiting to be processed. It is sorted in the order that * we will service the queues. */ |
a36e71f99 cfq-iosched: add ... |
2105 |
static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
2106 |
bool add_front) |
d9e7620e6 cfq-iosched: rewo... |
2107 |
{ |
0871714e0 cfq-iosched: rela... |
2108 2109 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
9a7f38c42 cfq-iosched: Conv... |
2110 |
u64 rb_key; |
34b98d03b cfq-iosched: Rena... |
2111 |
struct cfq_rb_root *st; |
498d3aa2b [PATCH] cfq-iosch... |
2112 |
int left; |
dae739ebc blkio: Group time... |
2113 |
int new_cfqq = 1; |
9a7f38c42 cfq-iosched: Conv... |
2114 |
u64 now = ktime_get_ns(); |
ae30c2865 blkio: Implement ... |
2115 |
|
34b98d03b cfq-iosched: Rena... |
2116 |
st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq)); |
0871714e0 cfq-iosched: rela... |
2117 2118 |
if (cfq_class_idle(cfqq)) { rb_key = CFQ_IDLE_DELAY; |
34b98d03b cfq-iosched: Rena... |
2119 |
parent = rb_last(&st->rb); |
0871714e0 cfq-iosched: rela... |
2120 2121 2122 2123 |
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... |
2124 |
rb_key += now; |
0871714e0 cfq-iosched: rela... |
2125 |
} else if (!add_front) { |
b9c8946b1 cfq-iosched: fix ... |
2126 2127 2128 2129 2130 2131 |
/* * 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... |
2132 |
rb_key = cfq_slice_offset(cfqd, cfqq) + now; |
b9c8946b1 cfq-iosched: fix ... |
2133 |
rb_key -= cfqq->slice_resid; |
edd75ffd9 cfq-iosched: get ... |
2134 |
cfqq->slice_resid = 0; |
48e025e63 cfq-iosched: fix ... |
2135 |
} else { |
9a7f38c42 cfq-iosched: Conv... |
2136 |
rb_key = -NSEC_PER_SEC; |
34b98d03b cfq-iosched: Rena... |
2137 |
__cfqq = cfq_rb_first(st); |
9a7f38c42 cfq-iosched: Conv... |
2138 |
rb_key += __cfqq ? __cfqq->rb_key : now; |
48e025e63 cfq-iosched: fix ... |
2139 |
} |
1da177e4c Linux-2.6.12-rc2 |
2140 |
|
d9e7620e6 cfq-iosched: rewo... |
2141 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
dae739ebc blkio: Group time... |
2142 |
new_cfqq = 0; |
99f9628ab [PATCH] cfq-iosch... |
2143 |
/* |
d9e7620e6 cfq-iosched: rewo... |
2144 |
* same position, nothing more to do |
99f9628ab [PATCH] cfq-iosch... |
2145 |
*/ |
34b98d03b cfq-iosched: Rena... |
2146 |
if (rb_key == cfqq->rb_key && cfqq->service_tree == st) |
d9e7620e6 cfq-iosched: rewo... |
2147 |
return; |
1da177e4c Linux-2.6.12-rc2 |
2148 |
|
aa6f6a3de cfq-iosched: prep... |
2149 2150 |
cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2151 |
} |
d9e7620e6 cfq-iosched: rewo... |
2152 |
|
498d3aa2b [PATCH] cfq-iosch... |
2153 |
left = 1; |
0871714e0 cfq-iosched: rela... |
2154 |
parent = NULL; |
34b98d03b cfq-iosched: Rena... |
2155 2156 |
cfqq->service_tree = st; p = &st->rb.rb_node; |
d9e7620e6 cfq-iosched: rewo... |
2157 2158 2159 |
while (*p) { parent = *p; __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
0c534e0a4 cfq-iosched: sort... |
2160 |
/* |
c0324a020 cfq-iosched: reim... |
2161 |
* sort by key, that represents service time. |
0c534e0a4 cfq-iosched: sort... |
2162 |
*/ |
9a7f38c42 cfq-iosched: Conv... |
2163 |
if (rb_key < __cfqq->rb_key) |
1f23f1215 cfq-iosched: Get ... |
2164 |
p = &parent->rb_left; |
c0324a020 cfq-iosched: reim... |
2165 |
else { |
1f23f1215 cfq-iosched: Get ... |
2166 |
p = &parent->rb_right; |
cc09e2990 [PATCH] cfq-iosch... |
2167 |
left = 0; |
c0324a020 cfq-iosched: reim... |
2168 |
} |
d9e7620e6 cfq-iosched: rewo... |
2169 |
} |
cc09e2990 [PATCH] cfq-iosch... |
2170 |
if (left) |
34b98d03b cfq-iosched: Rena... |
2171 |
st->left = &cfqq->rb_node; |
cc09e2990 [PATCH] cfq-iosch... |
2172 |
|
d9e7620e6 cfq-iosched: rewo... |
2173 2174 |
cfqq->rb_key = rb_key; rb_link_node(&cfqq->rb_node, parent, p); |
34b98d03b cfq-iosched: Rena... |
2175 2176 |
rb_insert_color(&cfqq->rb_node, &st->rb); st->count++; |
20359f27e cfq-iosched: remo... |
2177 |
if (add_front || !new_cfqq) |
dae739ebc blkio: Group time... |
2178 |
return; |
8184f93ec cfq-iosched: Don'... |
2179 |
cfq_group_notify_queue_add(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2180 |
} |
a36e71f99 cfq-iosched: add ... |
2181 |
static struct cfq_queue * |
f2d1f0ae7 cfq-iosched: cach... |
2182 2183 2184 |
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 ... |
2185 |
{ |
a36e71f99 cfq-iosched: add ... |
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 |
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... |
2201 |
if (sector > blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2202 |
n = &(*p)->rb_right; |
2e46e8b27 block: drop reque... |
2203 |
else if (sector < blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2204 2205 2206 2207 |
n = &(*p)->rb_left; else break; p = n; |
3ac6c9f8a cfq-iosched: fix ... |
2208 |
cfqq = NULL; |
a36e71f99 cfq-iosched: add ... |
2209 2210 2211 2212 2213 |
} *ret_parent = parent; if (rb_link) *rb_link = p; |
3ac6c9f8a cfq-iosched: fix ... |
2214 |
return cfqq; |
a36e71f99 cfq-iosched: add ... |
2215 2216 2217 2218 |
} static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
a36e71f99 cfq-iosched: add ... |
2219 2220 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
f2d1f0ae7 cfq-iosched: cach... |
2221 2222 2223 2224 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
a36e71f99 cfq-iosched: add ... |
2225 2226 2227 2228 2229 |
if (cfq_class_idle(cfqq)) return; if (!cfqq->next_rq) return; |
f2d1f0ae7 cfq-iosched: cach... |
2230 |
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; |
2e46e8b27 block: drop reque... |
2231 2232 |
__cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, blk_rq_pos(cfqq->next_rq), &parent, &p); |
3ac6c9f8a cfq-iosched: fix ... |
2233 2234 |
if (!__cfqq) { rb_link_node(&cfqq->p_node, parent, p); |
f2d1f0ae7 cfq-iosched: cach... |
2235 2236 2237 |
rb_insert_color(&cfqq->p_node, cfqq->p_root); } else cfqq->p_root = NULL; |
a36e71f99 cfq-iosched: add ... |
2238 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2239 2240 2241 |
/* * Update cfqq's position in the service tree. */ |
edd75ffd9 cfq-iosched: get ... |
2242 |
static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
2243 |
{ |
6d048f531 cfq-iosched: deve... |
2244 2245 2246 |
/* * Resorting requires the cfqq to be on the RR list already. */ |
a36e71f99 cfq-iosched: add ... |
2247 |
if (cfq_cfqq_on_rr(cfqq)) { |
edd75ffd9 cfq-iosched: get ... |
2248 |
cfq_service_tree_add(cfqd, cfqq, 0); |
a36e71f99 cfq-iosched: add ... |
2249 2250 |
cfq_prio_tree_add(cfqd, cfqq); } |
6d048f531 cfq-iosched: deve... |
2251 |
} |
1da177e4c Linux-2.6.12-rc2 |
2252 2253 |
/* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
2254 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
2255 |
*/ |
febffd618 cfq-iosched: kill... |
2256 |
static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2257 |
{ |
7b679138b cfq-iosched: add ... |
2258 |
cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
2259 2260 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2261 |
cfqd->busy_queues++; |
ef8a41df8 cfq-iosched: give... |
2262 2263 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues++; |
1da177e4c Linux-2.6.12-rc2 |
2264 |
|
edd75ffd9 cfq-iosched: get ... |
2265 |
cfq_resort_rr_list(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2266 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2267 2268 2269 2270 |
/* * Called when the cfqq no longer has requests pending, remove it from * the service tree. */ |
febffd618 cfq-iosched: kill... |
2271 |
static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2272 |
{ |
7b679138b cfq-iosched: add ... |
2273 |
cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
2274 2275 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
2276 |
|
aa6f6a3de cfq-iosched: prep... |
2277 2278 2279 2280 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; } |
f2d1f0ae7 cfq-iosched: cach... |
2281 2282 2283 2284 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
d9e7620e6 cfq-iosched: rewo... |
2285 |
|
8184f93ec cfq-iosched: Don'... |
2286 |
cfq_group_notify_queue_del(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2287 2288 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; |
ef8a41df8 cfq-iosched: give... |
2289 2290 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues--; |
1da177e4c Linux-2.6.12-rc2 |
2291 2292 2293 2294 2295 |
} /* * rb tree support functions */ |
febffd618 cfq-iosched: kill... |
2296 |
static void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2297 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2298 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
5e7053747 [PATCH] cfq-iosch... |
2299 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
2300 |
|
b4878f245 [PATCH] 02/05: up... |
2301 2302 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
2303 |
|
5e7053747 [PATCH] cfq-iosch... |
2304 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
2305 |
|
f04a64246 blkio: Keep queue... |
2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 |
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 |
2317 |
} |
5e7053747 [PATCH] cfq-iosch... |
2318 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2319 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2320 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
2321 |
struct cfq_data *cfqd = cfqq->cfqd; |
796d5116c iosched: prevent ... |
2322 |
struct request *prev; |
1da177e4c Linux-2.6.12-rc2 |
2323 |
|
5380a101d [PATCH] cfq-iosch... |
2324 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
2325 |
|
796d5116c iosched: prevent ... |
2326 |
elv_rb_add(&cfqq->sort_list, rq); |
5fccbf61b [PATCH] CFQ: requ... |
2327 2328 2329 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
2330 2331 2332 2333 |
/* * check if this request is a better next-serve candidate */ |
a36e71f99 cfq-iosched: add ... |
2334 |
prev = cfqq->next_rq; |
cf7c25cf9 cfq-iosched: fix ... |
2335 |
cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq, cfqd->last_position); |
a36e71f99 cfq-iosched: add ... |
2336 2337 2338 2339 2340 2341 |
/* * adjust priority tree position, if ->next_rq changes */ if (prev != cfqq->next_rq) cfq_prio_tree_add(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
2342 |
BUG_ON(!cfqq->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
2343 |
} |
febffd618 cfq-iosched: kill... |
2344 |
static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2345 |
{ |
5380a101d [PATCH] cfq-iosch... |
2346 2347 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
63a4cc248 blkg_rwstat: sepa... |
2348 |
cfqg_stats_update_io_remove(RQ_CFQG(rq), req_op(rq), rq->cmd_flags); |
5e7053747 [PATCH] cfq-iosch... |
2349 |
cfq_add_rq_rb(rq); |
155fead9b blkcg: move blkio... |
2350 |
cfqg_stats_update_io_add(RQ_CFQG(rq), cfqq->cfqd->serving_group, |
63a4cc248 blkg_rwstat: sepa... |
2351 |
req_op(rq), rq->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
2352 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
2353 2354 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2355 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
2356 |
struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
2357 |
struct cfq_io_cq *cic; |
206dc69b3 [BLOCK] cfq-iosch... |
2358 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
2359 |
|
4ac845a2e block: cfq: make ... |
2360 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
2361 2362 2363 2364 |
if (!cic) return NULL; cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
f73a1c7d1 block: Add bio_en... |
2365 2366 |
if (cfqq) return elv_rb_find(&cfqq->sort_list, bio_end_sector(bio)); |
1da177e4c Linux-2.6.12-rc2 |
2367 |
|
1da177e4c Linux-2.6.12-rc2 |
2368 2369 |
return NULL; } |
165125e1e [BLOCK] Get rid o... |
2370 |
static void cfq_activate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2371 |
{ |
22e2c507c [PATCH] Update cf... |
2372 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
2373 |
|
53c583d22 cfq-iosched: requ... |
2374 |
cfqd->rq_in_driver++; |
7b679138b cfq-iosched: add ... |
2375 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
2376 |
cfqd->rq_in_driver); |
25776e359 [PATCH] cfq-iosch... |
2377 |
|
5b93629b4 block: implement ... |
2378 |
cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
2379 |
} |
165125e1e [BLOCK] Get rid o... |
2380 |
static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2381 |
{ |
b4878f245 [PATCH] 02/05: up... |
2382 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
53c583d22 cfq-iosched: requ... |
2383 2384 |
WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
7b679138b cfq-iosched: add ... |
2385 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
2386 |
cfqd->rq_in_driver); |
1da177e4c Linux-2.6.12-rc2 |
2387 |
} |
b4878f245 [PATCH] 02/05: up... |
2388 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2389 |
{ |
5e7053747 [PATCH] cfq-iosch... |
2390 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
2391 |
|
5e7053747 [PATCH] cfq-iosch... |
2392 2393 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
2394 |
|
b4878f245 [PATCH] 02/05: up... |
2395 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
2396 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
2397 |
|
45333d5a3 cfq-iosched: fix ... |
2398 |
cfqq->cfqd->rq_queued--; |
63a4cc248 blkg_rwstat: sepa... |
2399 |
cfqg_stats_update_io_remove(RQ_CFQG(rq), req_op(rq), rq->cmd_flags); |
65299a3b7 block: separate p... |
2400 2401 2402 |
if (rq->cmd_flags & REQ_PRIO) { WARN_ON(!cfqq->prio_pending); cfqq->prio_pending--; |
b53d1ed73 Revert "cfq: Remo... |
2403 |
} |
1da177e4c Linux-2.6.12-rc2 |
2404 |
} |
165125e1e [BLOCK] Get rid o... |
2405 2406 |
static int cfq_merge(struct request_queue *q, struct request **req, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2407 2408 2409 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
2410 |
|
206dc69b3 [BLOCK] cfq-iosch... |
2411 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
72ef799b3 block: do not mer... |
2412 |
if (__rq && elv_bio_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
2413 2414 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
2415 2416 2417 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
2418 |
} |
165125e1e [BLOCK] Get rid o... |
2419 |
static void cfq_merged_request(struct request_queue *q, struct request *req, |
21183b07e [PATCH] cfq-iosch... |
2420 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
2421 |
{ |
21183b07e [PATCH] cfq-iosch... |
2422 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
2423 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
2424 |
|
5e7053747 [PATCH] cfq-iosch... |
2425 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
2426 |
} |
1da177e4c Linux-2.6.12-rc2 |
2427 |
} |
812d40264 blkio: Add io_mer... |
2428 2429 2430 |
static void cfq_bio_merged(struct request_queue *q, struct request *req, struct bio *bio) { |
63a4cc248 blkg_rwstat: sepa... |
2431 |
cfqg_stats_update_io_merged(RQ_CFQG(req), bio_op(bio), bio->bi_rw); |
812d40264 blkio: Add io_mer... |
2432 |
} |
1da177e4c Linux-2.6.12-rc2 |
2433 |
static void |
165125e1e [BLOCK] Get rid o... |
2434 |
cfq_merged_requests(struct request_queue *q, struct request *rq, |
1da177e4c Linux-2.6.12-rc2 |
2435 2436 |
struct request *next) { |
cf7c25cf9 cfq-iosched: fix ... |
2437 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
4a0b75c7d block, cfq: fix e... |
2438 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
22e2c507c [PATCH] Update cf... |
2439 2440 2441 2442 |
/* * reposition in fifo if next is older than rq */ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && |
9a7f38c42 cfq-iosched: Conv... |
2443 |
next->fifo_time < rq->fifo_time && |
3d106fba2 block CFQ: avoid ... |
2444 |
cfqq == RQ_CFQQ(next)) { |
22e2c507c [PATCH] Update cf... |
2445 |
list_move(&rq->queuelist, &next->queuelist); |
8b4922d31 block: Stop abusi... |
2446 |
rq->fifo_time = next->fifo_time; |
30996f40b cfq-iosched: fix ... |
2447 |
} |
22e2c507c [PATCH] Update cf... |
2448 |
|
cf7c25cf9 cfq-iosched: fix ... |
2449 2450 |
if (cfqq->next_rq == next) cfqq->next_rq = rq; |
b4878f245 [PATCH] 02/05: up... |
2451 |
cfq_remove_request(next); |
63a4cc248 blkg_rwstat: sepa... |
2452 |
cfqg_stats_update_io_merged(RQ_CFQG(rq), req_op(next), next->cmd_flags); |
4a0b75c7d block, cfq: fix e... |
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 |
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... |
2463 |
} |
72ef799b3 block: do not mer... |
2464 2465 |
static int cfq_allow_bio_merge(struct request_queue *q, struct request *rq, struct bio *bio) |
da7752650 [PATCH] cfq-iosch... |
2466 2467 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
c58698073 block, cfq: reorg... |
2468 |
struct cfq_io_cq *cic; |
da7752650 [PATCH] cfq-iosch... |
2469 |
struct cfq_queue *cfqq; |
da7752650 [PATCH] cfq-iosch... |
2470 2471 |
/* |
ec8acb690 [PATCH] cfq-iosch... |
2472 |
* Disallow merge of a sync bio into an async request. |
da7752650 [PATCH] cfq-iosch... |
2473 |
*/ |
91fac317a cfq-iosched: get ... |
2474 |
if (cfq_bio_sync(bio) && !rq_is_sync(rq)) |
a6151c3a5 cfq-iosched: appl... |
2475 |
return false; |
da7752650 [PATCH] cfq-iosch... |
2476 2477 |
/* |
f1a4f4d35 block, cfq: fix c... |
2478 |
* Lookup the cfqq that this bio will be queued with and allow |
07c2bd373 block: don't call... |
2479 |
* merge only if rq is queued there. |
f1a4f4d35 block, cfq: fix c... |
2480 |
*/ |
07c2bd373 block: don't call... |
2481 2482 2483 |
cic = cfq_cic_lookup(cfqd, current->io_context); if (!cic) return false; |
719d34027 [PATCH] cfq-iosch... |
2484 |
|
91fac317a cfq-iosched: get ... |
2485 |
cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
a6151c3a5 cfq-iosched: appl... |
2486 |
return cfqq == RQ_CFQQ(rq); |
da7752650 [PATCH] cfq-iosch... |
2487 |
} |
72ef799b3 block: do not mer... |
2488 2489 2490 2491 2492 |
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... |
2493 2494 |
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
911483258 cfq-iosched: Conv... |
2495 |
hrtimer_try_to_cancel(&cfqd->idle_slice_timer); |
155fead9b blkcg: move blkio... |
2496 |
cfqg_stats_update_idle_time(cfqq->cfqg); |
812df48d1 blkio: Add more d... |
2497 |
} |
febffd618 cfq-iosched: kill... |
2498 2499 |
static void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
2500 2501 |
{ if (cfqq) { |
3bf10fea3 cfq-iosched: Prop... |
2502 |
cfq_log_cfqq(cfqd, cfqq, "set_active wl_class:%d wl_type:%d", |
4d2ceea4c cfq-iosched: More... |
2503 |
cfqd->serving_wl_class, cfqd->serving_wl_type); |
155fead9b blkcg: move blkio... |
2504 |
cfqg_stats_update_avg_queue_size(cfqq->cfqg); |
62a37f6ba cfq-iosched: Don'... |
2505 |
cfqq->slice_start = 0; |
9a7f38c42 cfq-iosched: Conv... |
2506 |
cfqq->dispatch_start = ktime_get_ns(); |
62a37f6ba cfq-iosched: Don'... |
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 |
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... |
2519 2520 2521 2522 2523 2524 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
2525 2526 2527 2528 |
* 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... |
2529 |
bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
2530 |
{ |
7b679138b cfq-iosched: add ... |
2531 |
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
2532 |
if (cfq_cfqq_wait_request(cfqq)) |
812df48d1 blkio: Add more d... |
2533 |
cfq_del_timer(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2534 |
|
7b14e3b52 [PATCH] cfq-iosch... |
2535 |
cfq_clear_cfqq_wait_request(cfqq); |
f75edf2dc blkio: Wait for c... |
2536 |
cfq_clear_cfqq_wait_busy(cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2537 2538 |
/* |
ae54abed6 cfq-iosched: spli... |
2539 2540 2541 2542 2543 2544 2545 2546 2547 |
* 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'... |
2548 |
* store what was left of this slice, if the queue idled/timed out |
7b14e3b52 [PATCH] cfq-iosch... |
2549 |
*/ |
c553f8e33 block cfq: compen... |
2550 2551 |
if (timed_out) { if (cfq_cfqq_slice_new(cfqq)) |
ba5bd520f cfq: rename a fun... |
2552 |
cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
2553 |
else |
9a7f38c42 cfq-iosched: Conv... |
2554 |
cfqq->slice_resid = cfqq->slice_end - ktime_get_ns(); |
93fdf1478 cfq-iosched: Conv... |
2555 |
cfq_log_cfqq(cfqd, cfqq, "resid=%lld", cfqq->slice_resid); |
7b679138b cfq-iosched: add ... |
2556 |
} |
7b14e3b52 [PATCH] cfq-iosch... |
2557 |
|
e5ff082e8 blkio: Fix anothe... |
2558 |
cfq_group_served(cfqd, cfqq->cfqg, cfqq); |
dae739ebc blkio: Group time... |
2559 |
|
f04a64246 blkio: Keep queue... |
2560 2561 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) cfq_del_cfqq_rr(cfqd, cfqq); |
edd75ffd9 cfq-iosched: get ... |
2562 |
cfq_resort_rr_list(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
2563 2564 2565 2566 2567 |
if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { |
11a3122f6 block: strip out ... |
2568 |
put_io_context(cfqd->active_cic->icq.ioc); |
7b14e3b52 [PATCH] cfq-iosch... |
2569 2570 |
cfqd->active_cic = NULL; } |
7b14e3b52 [PATCH] cfq-iosch... |
2571 |
} |
e5ff082e8 blkio: Fix anothe... |
2572 |
static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
2573 2574 2575 2576 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) |
e5ff082e8 blkio: Fix anothe... |
2577 |
__cfq_slice_expired(cfqd, cfqq, timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
2578 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2579 2580 2581 2582 |
/* * 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... |
2583 |
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
2584 |
{ |
34b98d03b cfq-iosched: Rena... |
2585 2586 |
struct cfq_rb_root *st = st_for(cfqd->serving_group, cfqd->serving_wl_class, cfqd->serving_wl_type); |
d9e7620e6 cfq-iosched: rewo... |
2587 |
|
f04a64246 blkio: Keep queue... |
2588 2589 |
if (!cfqd->rq_queued) return NULL; |
1fa8f6d68 blkio: Introduce ... |
2590 |
/* There is nothing to dispatch */ |
34b98d03b cfq-iosched: Rena... |
2591 |
if (!st) |
1fa8f6d68 blkio: Introduce ... |
2592 |
return NULL; |
34b98d03b cfq-iosched: Rena... |
2593 |
if (RB_EMPTY_ROOT(&st->rb)) |
c0324a020 cfq-iosched: reim... |
2594 |
return NULL; |
34b98d03b cfq-iosched: Rena... |
2595 |
return cfq_rb_first(st); |
6d048f531 cfq-iosched: deve... |
2596 |
} |
f04a64246 blkio: Keep queue... |
2597 2598 |
static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) { |
25fb5169d blkio: Dynamic cf... |
2599 |
struct cfq_group *cfqg; |
f04a64246 blkio: Keep queue... |
2600 2601 2602 2603 2604 2605 |
struct cfq_queue *cfqq; int i, j; struct cfq_rb_root *st; if (!cfqd->rq_queued) return NULL; |
25fb5169d blkio: Dynamic cf... |
2606 2607 2608 |
cfqg = cfq_get_next_cfqg(cfqd); if (!cfqg) return NULL; |
f04a64246 blkio: Keep queue... |
2609 2610 2611 2612 2613 |
for_each_cfqg_st(cfqg, i, j, st) if ((cfqq = cfq_rb_first(st)) != NULL) return cfqq; return NULL; } |
498d3aa2b [PATCH] cfq-iosch... |
2614 2615 2616 |
/* * Get and set a new active queue for service. */ |
a36e71f99 cfq-iosched: add ... |
2617 2618 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
2619 |
{ |
e00ef7997 cfq-iosched: get ... |
2620 |
if (!cfqq) |
a36e71f99 cfq-iosched: add ... |
2621 |
cfqq = cfq_get_next_queue(cfqd); |
6d048f531 cfq-iosched: deve... |
2622 |
|
22e2c507c [PATCH] Update cf... |
2623 |
__cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
2624 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
2625 |
} |
d9e7620e6 cfq-iosched: rewo... |
2626 2627 2628 |
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, struct request *rq) { |
83096ebf1 block: convert to... |
2629 2630 |
if (blk_rq_pos(rq) >= cfqd->last_position) return blk_rq_pos(rq) - cfqd->last_position; |
d9e7620e6 cfq-iosched: rewo... |
2631 |
else |
83096ebf1 block: convert to... |
2632 |
return cfqd->last_position - blk_rq_pos(rq); |
d9e7620e6 cfq-iosched: rewo... |
2633 |
} |
b2c18e1e0 cfq: calculate th... |
2634 |
static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e9ce335df cfq-iosched: fix ... |
2635 |
struct request *rq) |
6d048f531 cfq-iosched: deve... |
2636 |
{ |
e9ce335df cfq-iosched: fix ... |
2637 |
return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR; |
6d048f531 cfq-iosched: deve... |
2638 |
} |
a36e71f99 cfq-iosched: add ... |
2639 2640 2641 |
static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, struct cfq_queue *cur_cfqq) { |
f2d1f0ae7 cfq-iosched: cach... |
2642 |
struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; |
a36e71f99 cfq-iosched: add ... |
2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 |
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... |
2654 |
__cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); |
a36e71f99 cfq-iosched: add ... |
2655 2656 2657 2658 2659 2660 2661 2662 |
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 ... |
2663 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2664 |
return __cfqq; |
2e46e8b27 block: drop reque... |
2665 |
if (blk_rq_pos(__cfqq->next_rq) < sector) |
a36e71f99 cfq-iosched: add ... |
2666 2667 2668 2669 2670 2671 2672 |
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 ... |
2673 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 |
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... |
2690 |
struct cfq_queue *cur_cfqq) |
6d048f531 cfq-iosched: deve... |
2691 |
{ |
a36e71f99 cfq-iosched: add ... |
2692 |
struct cfq_queue *cfqq; |
39c01b219 cfq-iosched: Do n... |
2693 2694 |
if (cfq_class_idle(cur_cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
2695 2696 2697 2698 |
if (!cfq_cfqq_sync(cur_cfqq)) return NULL; if (CFQQ_SEEKY(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
2699 |
/* |
b9d8f4c73 cfq: Optimization... |
2700 2701 2702 2703 2704 2705 |
* 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... |
2706 2707 2708 |
* 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... |
2709 |
*/ |
a36e71f99 cfq-iosched: add ... |
2710 2711 2712 |
cfqq = cfqq_close(cfqd, cur_cfqq); if (!cfqq) return NULL; |
8682e1f15 blkio: Provide so... |
2713 2714 2715 |
/* If new queue belongs to different cfq_group, don't choose it */ if (cur_cfqq->cfqg != cfqq->cfqg) return NULL; |
df5fe3e8e cfq: merge cooper... |
2716 2717 2718 2719 2720 |
/* * It only makes sense to merge sync queues. */ if (!cfq_cfqq_sync(cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
2721 2722 |
if (CFQQ_SEEKY(cfqq)) return NULL; |
df5fe3e8e cfq: merge cooper... |
2723 |
|
c0324a020 cfq-iosched: reim... |
2724 2725 2726 2727 2728 |
/* * Do not merge queues of different priority classes */ if (cfq_class_rt(cfqq) != cfq_class_rt(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
2729 |
return cfqq; |
6d048f531 cfq-iosched: deve... |
2730 |
} |
a6d44e982 cfq-iosched: enab... |
2731 2732 2733 2734 2735 2736 |
/* * 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... |
2737 |
enum wl_class_t wl_class = cfqq_class(cfqq); |
34b98d03b cfq-iosched: Rena... |
2738 |
struct cfq_rb_root *st = cfqq->service_tree; |
a6d44e982 cfq-iosched: enab... |
2739 |
|
34b98d03b cfq-iosched: Rena... |
2740 2741 |
BUG_ON(!st); BUG_ON(!st->count); |
f04a64246 blkio: Keep queue... |
2742 |
|
b6508c161 cfq-iosched: Do n... |
2743 2744 |
if (!cfqd->cfq_slice_idle) return false; |
a6d44e982 cfq-iosched: enab... |
2745 |
/* We never do for idle class queues. */ |
3bf10fea3 cfq-iosched: Prop... |
2746 |
if (wl_class == IDLE_WORKLOAD) |
a6d44e982 cfq-iosched: enab... |
2747 2748 2749 |
return false; /* We do for queues that were marked with idle window flag. */ |
3c764b7a6 cfq-iosched: make... |
2750 2751 |
if (cfq_cfqq_idle_window(cfqq) && !(blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)) |
a6d44e982 cfq-iosched: enab... |
2752 2753 2754 2755 2756 2757 |
return true; /* * Otherwise, we do only if they are the last ones * in their service tree. */ |
34b98d03b cfq-iosched: Rena... |
2758 2759 |
if (st->count == 1 && cfq_cfqq_sync(cfqq) && !cfq_io_thinktime_big(cfqd, &st->ttime, false)) |
c1e44756f cfq-iosched: do c... |
2760 |
return true; |
34b98d03b cfq-iosched: Rena... |
2761 |
cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", st->count); |
c1e44756f cfq-iosched: do c... |
2762 |
return false; |
a6d44e982 cfq-iosched: enab... |
2763 |
} |
6d048f531 cfq-iosched: deve... |
2764 |
static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
2765 |
{ |
1792669cc cfq-iosched: don'... |
2766 |
struct cfq_queue *cfqq = cfqd->active_queue; |
e795421e4 cfq-iosched: Don'... |
2767 |
struct cfq_rb_root *st = cfqq->service_tree; |
c58698073 block, cfq: reorg... |
2768 |
struct cfq_io_cq *cic; |
9a7f38c42 cfq-iosched: Conv... |
2769 2770 |
u64 sl, group_idle = 0; u64 now = ktime_get_ns(); |
7b14e3b52 [PATCH] cfq-iosch... |
2771 |
|
a68bbddba block: add queue ... |
2772 |
/* |
f7d7b7a7a block: as/cfq ssd... |
2773 2774 2775 |
* 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 ... |
2776 |
*/ |
f7d7b7a7a block: as/cfq ssd... |
2777 |
if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag) |
a68bbddba block: add queue ... |
2778 |
return; |
dd67d0515 [PATCH] rbtree: s... |
2779 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
6d048f531 cfq-iosched: deve... |
2780 |
WARN_ON(cfq_cfqq_slice_new(cfqq)); |
22e2c507c [PATCH] Update cf... |
2781 2782 2783 2784 |
/* * idle is disabled, either manually or by past process history */ |
80bdf0c78 cfq-iosched: Impl... |
2785 2786 2787 2788 2789 2790 2791 |
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... |
2792 |
|
22e2c507c [PATCH] Update cf... |
2793 |
/* |
8e550632c cfq-iosched: fix ... |
2794 |
* still active requests from this queue, don't idle |
7b679138b cfq-iosched: add ... |
2795 |
*/ |
8e550632c cfq-iosched: fix ... |
2796 |
if (cfqq->dispatched) |
7b679138b cfq-iosched: add ... |
2797 2798 2799 |
return; /* |
22e2c507c [PATCH] Update cf... |
2800 2801 |
* task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
2802 |
cic = cfqd->active_cic; |
f6e8d01be block: add io_con... |
2803 |
if (!cic || !atomic_read(&cic->icq.ioc->active_ref)) |
6d048f531 cfq-iosched: deve... |
2804 |
return; |
355b659c8 cfq-iosched: avoi... |
2805 2806 2807 2808 2809 |
/* * 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... |
2810 |
if (sample_valid(cic->ttime.ttime_samples) && |
9a7f38c42 cfq-iosched: Conv... |
2811 2812 |
(cfqq->slice_end - now < cic->ttime.ttime_mean)) { cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%llu", |
383cd7213 CFQ: move think t... |
2813 |
cic->ttime.ttime_mean); |
355b659c8 cfq-iosched: avoi... |
2814 |
return; |
b1ffe737f cfq-iosched: Add ... |
2815 |
} |
355b659c8 cfq-iosched: avoi... |
2816 |
|
e795421e4 cfq-iosched: Don'... |
2817 2818 2819 2820 2821 2822 2823 |
/* * 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... |
2824 |
return; |
3b18152c3 [PATCH] CFQ io sc... |
2825 |
cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
2826 |
|
80bdf0c78 cfq-iosched: Impl... |
2827 2828 2829 2830 |
if (group_idle) sl = cfqd->cfq_group_idle; else sl = cfqd->cfq_slice_idle; |
206dc69b3 [BLOCK] cfq-iosch... |
2831 |
|
911483258 cfq-iosched: Conv... |
2832 2833 |
hrtimer_start(&cfqd->idle_slice_timer, ns_to_ktime(sl), HRTIMER_MODE_REL); |
155fead9b blkcg: move blkio... |
2834 |
cfqg_stats_set_start_idle_time(cfqq->cfqg); |
9a7f38c42 cfq-iosched: Conv... |
2835 |
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %llu group_idle: %d", sl, |
80bdf0c78 cfq-iosched: Impl... |
2836 |
group_idle ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
2837 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2838 2839 2840 |
/* * Move request from internal lists to the request queue dispatch list. */ |
165125e1e [BLOCK] Get rid o... |
2841 |
static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
2842 |
{ |
3ed9a2965 cfq-iosched: impr... |
2843 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
2844 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
2845 |
|
7b679138b cfq-iosched: add ... |
2846 |
cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); |
06d218864 cfq: choose a new... |
2847 |
cfqq->next_rq = cfq_find_next_rq(cfqd, cfqq, rq); |
5380a101d [PATCH] cfq-iosch... |
2848 |
cfq_remove_request(rq); |
6d048f531 cfq-iosched: deve... |
2849 |
cfqq->dispatched++; |
80bdf0c78 cfq-iosched: Impl... |
2850 |
(RQ_CFQG(rq))->dispatched++; |
5380a101d [PATCH] cfq-iosch... |
2851 |
elv_dispatch_sort(q, rq); |
3ed9a2965 cfq-iosched: impr... |
2852 |
|
53c583d22 cfq-iosched: requ... |
2853 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++; |
c4e7893eb cfq-iosched: blkt... |
2854 |
cfqq->nr_sectors += blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
2855 2856 2857 2858 2859 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
febffd618 cfq-iosched: kill... |
2860 |
static struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2861 |
{ |
30996f40b cfq-iosched: fix ... |
2862 |
struct request *rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2863 |
|
3b18152c3 [PATCH] CFQ io sc... |
2864 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
2865 |
return NULL; |
cb8874119 cfq-iosched: twea... |
2866 2867 |
cfq_mark_cfqq_fifo_expire(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
2868 2869 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2870 |
|
89850f7ee [PATCH] cfq-iosch... |
2871 |
rq = rq_entry_fifo(cfqq->fifo.next); |
9a7f38c42 cfq-iosched: Conv... |
2872 |
if (ktime_get_ns() < rq->fifo_time) |
7b679138b cfq-iosched: add ... |
2873 |
rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2874 |
|
30996f40b cfq-iosched: fix ... |
2875 |
cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq); |
6d048f531 cfq-iosched: deve... |
2876 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
2877 |
} |
22e2c507c [PATCH] Update cf... |
2878 2879 2880 2881 |
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 |
2882 |
|
22e2c507c [PATCH] Update cf... |
2883 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
2884 |
|
b9f8ce059 cfq-iosched: alge... |
2885 |
return 2 * base_rq * (IOPRIO_BE_NR - cfqq->ioprio); |
1da177e4c Linux-2.6.12-rc2 |
2886 |
} |
22e2c507c [PATCH] Update cf... |
2887 |
/* |
df5fe3e8e cfq: merge cooper... |
2888 2889 2890 2891 2892 2893 2894 |
* 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 ... |
2895 |
process_refs = cfqq->ref - io_refs; |
df5fe3e8e cfq: merge cooper... |
2896 2897 2898 2899 2900 2901 |
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 ... |
2902 |
int process_refs, new_process_refs; |
df5fe3e8e cfq: merge cooper... |
2903 |
struct cfq_queue *__cfqq; |
c10b61f09 cfq: Don't allow ... |
2904 2905 2906 2907 2908 2909 2910 2911 |
/* * 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... |
2912 2913 2914 2915 2916 2917 2918 2919 |
/* 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 ... |
2920 |
new_process_refs = cfqq_process_refs(new_cfqq); |
df5fe3e8e cfq: merge cooper... |
2921 2922 2923 2924 |
/* * If the process for the cfqq has gone away, there is no * sense in merging the queues. */ |
c10b61f09 cfq: Don't allow ... |
2925 |
if (process_refs == 0 || new_process_refs == 0) |
df5fe3e8e cfq: merge cooper... |
2926 |
return; |
e6c5bc737 cfq: break apart ... |
2927 2928 2929 |
/* * Merge in the direction of the lesser amount of work. */ |
e6c5bc737 cfq: break apart ... |
2930 2931 |
if (new_process_refs >= process_refs) { cfqq->new_cfqq = new_cfqq; |
30d7b9448 block cfq: don't ... |
2932 |
new_cfqq->ref += process_refs; |
e6c5bc737 cfq: break apart ... |
2933 2934 |
} else { new_cfqq->new_cfqq = cfqq; |
30d7b9448 block cfq: don't ... |
2935 |
cfqq->ref += new_process_refs; |
e6c5bc737 cfq: break apart ... |
2936 |
} |
df5fe3e8e cfq: merge cooper... |
2937 |
} |
6d816ec7c cfq-iosched: Rena... |
2938 |
static enum wl_type_t cfq_choose_wl_type(struct cfq_data *cfqd, |
3bf10fea3 cfq-iosched: Prop... |
2939 |
struct cfq_group *cfqg, enum wl_class_t wl_class) |
718eee057 cfq-iosched: fair... |
2940 2941 2942 2943 |
{ struct cfq_queue *queue; int i; bool key_valid = false; |
9a7f38c42 cfq-iosched: Conv... |
2944 |
u64 lowest_key = 0; |
718eee057 cfq-iosched: fair... |
2945 |
enum wl_type_t cur_best = SYNC_NOIDLE_WORKLOAD; |
65b32a573 cfq-iosched: Remo... |
2946 2947 |
for (i = 0; i <= SYNC_WORKLOAD; ++i) { /* select the one with lowest rb_key */ |
34b98d03b cfq-iosched: Rena... |
2948 |
queue = cfq_rb_first(st_for(cfqg, wl_class, i)); |
718eee057 cfq-iosched: fair... |
2949 |
if (queue && |
9a7f38c42 cfq-iosched: Conv... |
2950 |
(!key_valid || queue->rb_key < lowest_key)) { |
718eee057 cfq-iosched: fair... |
2951 2952 2953 2954 2955 2956 2957 2958 |
lowest_key = queue->rb_key; cur_best = i; key_valid = true; } } return cur_best; } |
6d816ec7c cfq-iosched: Rena... |
2959 2960 |
static void choose_wl_class_and_type(struct cfq_data *cfqd, struct cfq_group *cfqg) |
718eee057 cfq-iosched: fair... |
2961 |
{ |
9a7f38c42 cfq-iosched: Conv... |
2962 |
u64 slice; |
718eee057 cfq-iosched: fair... |
2963 |
unsigned count; |
cdb16e8f7 blkio: Introduce ... |
2964 |
struct cfq_rb_root *st; |
9a7f38c42 cfq-iosched: Conv... |
2965 |
u64 group_slice; |
4d2ceea4c cfq-iosched: More... |
2966 |
enum wl_class_t original_class = cfqd->serving_wl_class; |
9a7f38c42 cfq-iosched: Conv... |
2967 |
u64 now = ktime_get_ns(); |
1fa8f6d68 blkio: Introduce ... |
2968 |
|
718eee057 cfq-iosched: fair... |
2969 |
/* Choose next priority. RT > BE > IDLE */ |
58ff82f34 blkio: Implement ... |
2970 |
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg)) |
4d2ceea4c cfq-iosched: More... |
2971 |
cfqd->serving_wl_class = RT_WORKLOAD; |
58ff82f34 blkio: Implement ... |
2972 |
else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg)) |
4d2ceea4c cfq-iosched: More... |
2973 |
cfqd->serving_wl_class = BE_WORKLOAD; |
718eee057 cfq-iosched: fair... |
2974 |
else { |
4d2ceea4c cfq-iosched: More... |
2975 |
cfqd->serving_wl_class = IDLE_WORKLOAD; |
9a7f38c42 cfq-iosched: Conv... |
2976 |
cfqd->workload_expires = now + jiffies_to_nsecs(1); |
718eee057 cfq-iosched: fair... |
2977 2978 |
return; } |
4d2ceea4c cfq-iosched: More... |
2979 |
if (original_class != cfqd->serving_wl_class) |
e4ea0c16a block cfq: select... |
2980 |
goto new_workload; |
718eee057 cfq-iosched: fair... |
2981 2982 2983 2984 2985 |
/* * 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... |
2986 |
st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
cdb16e8f7 blkio: Introduce ... |
2987 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2988 2989 |
/* |
65b32a573 cfq-iosched: Remo... |
2990 |
* check workload expiration, and that we still have other queues ready |
718eee057 cfq-iosched: fair... |
2991 |
*/ |
9a7f38c42 cfq-iosched: Conv... |
2992 |
if (count && !(now > cfqd->workload_expires)) |
718eee057 cfq-iosched: fair... |
2993 |
return; |
e4ea0c16a block cfq: select... |
2994 |
new_workload: |
718eee057 cfq-iosched: fair... |
2995 |
/* otherwise select new workload type */ |
6d816ec7c cfq-iosched: Rena... |
2996 |
cfqd->serving_wl_type = cfq_choose_wl_type(cfqd, cfqg, |
4d2ceea4c cfq-iosched: More... |
2997 |
cfqd->serving_wl_class); |
34b98d03b cfq-iosched: Rena... |
2998 |
st = st_for(cfqg, cfqd->serving_wl_class, cfqd->serving_wl_type); |
cdb16e8f7 blkio: Introduce ... |
2999 |
count = st->count; |
718eee057 cfq-iosched: fair... |
3000 3001 3002 3003 3004 3005 |
/* * 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 ... |
3006 |
group_slice = cfq_group_slice(cfqd, cfqg); |
9a7f38c42 cfq-iosched: Conv... |
3007 |
slice = div_u64(group_slice * count, |
4d2ceea4c cfq-iosched: More... |
3008 3009 |
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... |
3010 |
cfqg))); |
718eee057 cfq-iosched: fair... |
3011 |
|
4d2ceea4c cfq-iosched: More... |
3012 |
if (cfqd->serving_wl_type == ASYNC_WORKLOAD) { |
9a7f38c42 cfq-iosched: Conv... |
3013 |
u64 tmp; |
f26bd1f0a blkio: Determine ... |
3014 3015 3016 3017 3018 3019 3020 3021 |
/* * 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... |
3022 3023 |
tmp = cfqd->cfq_target_latency * cfqg_busy_async_queues(cfqd, cfqg); |
9a7f38c42 cfq-iosched: Conv... |
3024 3025 |
tmp = div_u64(tmp, cfqd->busy_queues); slice = min_t(u64, slice, tmp); |
f26bd1f0a blkio: Determine ... |
3026 |
|
718eee057 cfq-iosched: fair... |
3027 3028 |
/* async workload slice is scaled down according to * the sync/async slice ratio. */ |
9a7f38c42 cfq-iosched: Conv... |
3029 |
slice = div64_u64(slice*cfqd->cfq_slice[0], cfqd->cfq_slice[1]); |
f26bd1f0a blkio: Determine ... |
3030 |
} else |
718eee057 cfq-iosched: fair... |
3031 3032 |
/* sync workload slice is at least 2 * cfq_slice_idle */ slice = max(slice, 2 * cfqd->cfq_slice_idle); |
9a7f38c42 cfq-iosched: Conv... |
3033 3034 3035 |
slice = max_t(u64, slice, CFQ_MIN_TT); cfq_log(cfqd, "workload slice:%llu", slice); cfqd->workload_expires = now + slice; |
718eee057 cfq-iosched: fair... |
3036 |
} |
1fa8f6d68 blkio: Introduce ... |
3037 3038 3039 |
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd) { struct cfq_rb_root *st = &cfqd->grp_service_tree; |
25bc6b077 blkio: Introduce ... |
3040 |
struct cfq_group *cfqg; |
1fa8f6d68 blkio: Introduce ... |
3041 3042 3043 |
if (RB_EMPTY_ROOT(&st->rb)) return NULL; |
25bc6b077 blkio: Introduce ... |
3044 |
cfqg = cfq_rb_first_group(st); |
25bc6b077 blkio: Introduce ... |
3045 3046 |
update_min_vdisktime(st); return cfqg; |
1fa8f6d68 blkio: Introduce ... |
3047 |
} |
cdb16e8f7 blkio: Introduce ... |
3048 3049 |
static void cfq_choose_cfqg(struct cfq_data *cfqd) { |
1fa8f6d68 blkio: Introduce ... |
3050 |
struct cfq_group *cfqg = cfq_get_next_cfqg(cfqd); |
9a7f38c42 cfq-iosched: Conv... |
3051 |
u64 now = ktime_get_ns(); |
1fa8f6d68 blkio: Introduce ... |
3052 3053 |
cfqd->serving_group = cfqg; |
dae739ebc blkio: Group time... |
3054 3055 |
/* Restore the workload type data */ |
4d2ceea4c cfq-iosched: More... |
3056 |
if (cfqg->saved_wl_slice) { |
9a7f38c42 cfq-iosched: Conv... |
3057 |
cfqd->workload_expires = now + cfqg->saved_wl_slice; |
4d2ceea4c cfq-iosched: More... |
3058 3059 |
cfqd->serving_wl_type = cfqg->saved_wl_type; cfqd->serving_wl_class = cfqg->saved_wl_class; |
66ae29197 cfq: set workload... |
3060 |
} else |
9a7f38c42 cfq-iosched: Conv... |
3061 |
cfqd->workload_expires = now - 1; |
66ae29197 cfq: set workload... |
3062 |
|
6d816ec7c cfq-iosched: Rena... |
3063 |
choose_wl_class_and_type(cfqd, cfqg); |
cdb16e8f7 blkio: Introduce ... |
3064 |
} |
df5fe3e8e cfq: merge cooper... |
3065 |
/* |
498d3aa2b [PATCH] cfq-iosch... |
3066 3067 |
* 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... |
3068 |
*/ |
1b5ed5e1f [BLOCK] cfq-iosch... |
3069 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
3070 |
{ |
a36e71f99 cfq-iosched: add ... |
3071 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
9a7f38c42 cfq-iosched: Conv... |
3072 |
u64 now = ktime_get_ns(); |
1da177e4c Linux-2.6.12-rc2 |
3073 |
|
22e2c507c [PATCH] Update cf... |
3074 3075 3076 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
3077 |
|
f04a64246 blkio: Keep queue... |
3078 3079 |
if (!cfqd->rq_queued) return NULL; |
c244bb50a cfq-iosched: Get ... |
3080 3081 3082 3083 3084 3085 |
/* * 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... |
3086 |
/* |
6d048f531 cfq-iosched: deve... |
3087 |
* The active queue has run out of time, expire it and select new. |
22e2c507c [PATCH] Update cf... |
3088 |
*/ |
7667aa063 cfq-iosched: Take... |
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 |
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... |
3099 3100 3101 |
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... |
3102 |
goto keep_queue; |
82bbbf28d Fix a CFQ crash i... |
3103 |
} else |
80bdf0c78 cfq-iosched: Impl... |
3104 |
goto check_group_idle; |
7667aa063 cfq-iosched: Take... |
3105 |
} |
1da177e4c Linux-2.6.12-rc2 |
3106 |
|
22e2c507c [PATCH] Update cf... |
3107 |
/* |
6d048f531 cfq-iosched: deve... |
3108 3109 |
* The active queue has requests and isn't expired, allow it to * dispatch. |
22e2c507c [PATCH] Update cf... |
3110 |
*/ |
dd67d0515 [PATCH] rbtree: s... |
3111 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
3112 |
goto keep_queue; |
6d048f531 cfq-iosched: deve... |
3113 3114 |
/* |
a36e71f99 cfq-iosched: add ... |
3115 3116 3117 |
* 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... |
3118 |
* tree. If possible, merge the expiring queue with the new cfqq. |
a36e71f99 cfq-iosched: add ... |
3119 |
*/ |
b3b6d0408 cfq: change the m... |
3120 |
new_cfqq = cfq_close_cooperator(cfqd, cfqq); |
df5fe3e8e cfq: merge cooper... |
3121 3122 3123 |
if (new_cfqq) { if (!cfqq->new_cfqq) cfq_setup_merge(cfqq, new_cfqq); |
a36e71f99 cfq-iosched: add ... |
3124 |
goto expire; |
df5fe3e8e cfq: merge cooper... |
3125 |
} |
a36e71f99 cfq-iosched: add ... |
3126 3127 |
/* |
6d048f531 cfq-iosched: deve... |
3128 3129 3130 3131 |
* 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... |
3132 |
if (hrtimer_active(&cfqd->idle_slice_timer)) { |
80bdf0c78 cfq-iosched: Impl... |
3133 3134 3135 |
cfqq = NULL; goto keep_queue; } |
8e1ac6655 cfq-iosched: don'... |
3136 3137 3138 3139 3140 3141 |
/* * 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... |
3142 |
(cfqq->slice_end - now > now - cfqq->slice_start))) { |
8e1ac6655 cfq-iosched: don'... |
3143 3144 3145 |
cfq_clear_cfqq_deep(cfqq); cfq_clear_cfqq_idle_window(cfqq); } |
80bdf0c78 cfq-iosched: Impl... |
3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 |
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... |
3156 3157 3158 |
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... |
3159 3160 |
cfqq = NULL; goto keep_queue; |
22e2c507c [PATCH] Update cf... |
3161 |
} |
3b18152c3 [PATCH] CFQ io sc... |
3162 |
expire: |
e5ff082e8 blkio: Fix anothe... |
3163 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
3164 |
new_queue: |
718eee057 cfq-iosched: fair... |
3165 3166 3167 3168 3169 |
/* * Current queue expired. Check if we have to switch to a new * service tree */ if (!new_cfqq) |
cdb16e8f7 blkio: Introduce ... |
3170 |
cfq_choose_cfqg(cfqd); |
718eee057 cfq-iosched: fair... |
3171 |
|
a36e71f99 cfq-iosched: add ... |
3172 |
cfqq = cfq_set_active_queue(cfqd, new_cfqq); |
22e2c507c [PATCH] Update cf... |
3173 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
3174 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
3175 |
} |
febffd618 cfq-iosched: kill... |
3176 |
static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) |
d9e7620e6 cfq-iosched: rewo... |
3177 3178 3179 3180 3181 3182 3183 3184 3185 |
{ 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... |
3186 3187 |
/* By default cfqq is not expired if it is empty. Do it explicitly */ |
e5ff082e8 blkio: Fix anothe... |
3188 |
__cfq_slice_expired(cfqq->cfqd, cfqq, 0); |
d9e7620e6 cfq-iosched: rewo... |
3189 3190 |
return dispatched; } |
498d3aa2b [PATCH] cfq-iosch... |
3191 3192 3193 3194 |
/* * Drain our current requests. Used for barriers and when switching * io schedulers on-the-fly. */ |
d9e7620e6 cfq-iosched: rewo... |
3195 |
static int cfq_forced_dispatch(struct cfq_data *cfqd) |
1b5ed5e1f [BLOCK] cfq-iosch... |
3196 |
{ |
0871714e0 cfq-iosched: rela... |
3197 |
struct cfq_queue *cfqq; |
d9e7620e6 cfq-iosched: rewo... |
3198 |
int dispatched = 0; |
cdb16e8f7 blkio: Introduce ... |
3199 |
|
3440c49f5 cfq-iosched: Fix ... |
3200 |
/* Expire the timeslice of the current active queue first */ |
e5ff082e8 blkio: Fix anothe... |
3201 |
cfq_slice_expired(cfqd, 0); |
3440c49f5 cfq-iosched: Fix ... |
3202 3203 |
while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) { __cfq_set_active_queue(cfqd, cfqq); |
f04a64246 blkio: Keep queue... |
3204 |
dispatched += __cfq_forced_dispatch_cfqq(cfqq); |
3440c49f5 cfq-iosched: Fix ... |
3205 |
} |
1b5ed5e1f [BLOCK] cfq-iosch... |
3206 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
3207 |
BUG_ON(cfqd->busy_queues); |
6923715ae cfq: remove extra... |
3208 |
cfq_log(cfqd, "forced_dispatch=%d", dispatched); |
1b5ed5e1f [BLOCK] cfq-iosch... |
3209 3210 |
return dispatched; } |
abc3c744d cfq-iosched: quan... |
3211 3212 3213 |
static inline bool cfq_slice_used_soon(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
9a7f38c42 cfq-iosched: Conv... |
3214 |
u64 now = ktime_get_ns(); |
abc3c744d cfq-iosched: quan... |
3215 3216 |
/* the queue hasn't finished any request, can't estimate */ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
3217 |
return true; |
9a7f38c42 cfq-iosched: Conv... |
3218 |
if (now + cfqd->cfq_slice_idle * cfqq->dispatched > cfqq->slice_end) |
c1e44756f cfq-iosched: do c... |
3219 |
return true; |
abc3c744d cfq-iosched: quan... |
3220 |
|
c1e44756f cfq-iosched: do c... |
3221 |
return false; |
abc3c744d cfq-iosched: quan... |
3222 |
} |
0b182d617 cfq-iosched: abst... |
3223 |
static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
2f5cb7381 cfq-iosched: chan... |
3224 |
{ |
2f5cb7381 cfq-iosched: chan... |
3225 |
unsigned int max_dispatch; |
22e2c507c [PATCH] Update cf... |
3226 |
|
2f5cb7381 cfq-iosched: chan... |
3227 |
/* |
5ad531db6 cfq-iosched: drai... |
3228 3229 |
* Drain async requests before we start sync IO */ |
53c583d22 cfq-iosched: requ... |
3230 |
if (cfq_should_idle(cfqd, cfqq) && cfqd->rq_in_flight[BLK_RW_ASYNC]) |
0b182d617 cfq-iosched: abst... |
3231 |
return false; |
5ad531db6 cfq-iosched: drai... |
3232 3233 |
/* |
2f5cb7381 cfq-iosched: chan... |
3234 3235 |
* If this is an async queue and we have sync IO in flight, let it wait */ |
53c583d22 cfq-iosched: requ... |
3236 |
if (cfqd->rq_in_flight[BLK_RW_SYNC] && !cfq_cfqq_sync(cfqq)) |
0b182d617 cfq-iosched: abst... |
3237 |
return false; |
2f5cb7381 cfq-iosched: chan... |
3238 |
|
abc3c744d cfq-iosched: quan... |
3239 |
max_dispatch = max_t(unsigned int, cfqd->cfq_quantum / 2, 1); |
2f5cb7381 cfq-iosched: chan... |
3240 3241 |
if (cfq_class_idle(cfqq)) max_dispatch = 1; |
b4878f245 [PATCH] 02/05: up... |
3242 |
|
2f5cb7381 cfq-iosched: chan... |
3243 3244 3245 3246 |
/* * Does this cfqq already have too much IO in flight? */ if (cfqq->dispatched >= max_dispatch) { |
ef8a41df8 cfq-iosched: give... |
3247 |
bool promote_sync = false; |
2f5cb7381 cfq-iosched: chan... |
3248 3249 3250 |
/* * idle queue must always only have a single IO in flight */ |
3ed9a2965 cfq-iosched: impr... |
3251 |
if (cfq_class_idle(cfqq)) |
0b182d617 cfq-iosched: abst... |
3252 |
return false; |
3ed9a2965 cfq-iosched: impr... |
3253 |
|
2f5cb7381 cfq-iosched: chan... |
3254 |
/* |
c4ade94fc cfq-iosched: remo... |
3255 3256 |
* If there is only one sync queue * we can ignore async queue here and give the sync |
ef8a41df8 cfq-iosched: give... |
3257 3258 3259 3260 |
* 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... |
3261 3262 |
if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) promote_sync = true; |
ef8a41df8 cfq-iosched: give... |
3263 3264 |
/* |
2f5cb7381 cfq-iosched: chan... |
3265 3266 |
* We have other queues, don't allow more IO from this one */ |
ef8a41df8 cfq-iosched: give... |
3267 3268 |
if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && !promote_sync) |
0b182d617 cfq-iosched: abst... |
3269 |
return false; |
9ede209e8 cfq-iosched: impr... |
3270 |
|
2f5cb7381 cfq-iosched: chan... |
3271 |
/* |
474b18ccc cfq-iosched: no d... |
3272 |
* Sole queue user, no limit |
365722bb9 cfq-iosched: dela... |
3273 |
*/ |
ef8a41df8 cfq-iosched: give... |
3274 |
if (cfqd->busy_queues == 1 || promote_sync) |
abc3c744d cfq-iosched: quan... |
3275 3276 3277 3278 3279 3280 3281 3282 3283 |
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... |
3284 3285 3286 3287 3288 3289 3290 |
} /* * 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... |
3291 |
if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) { |
9a7f38c42 cfq-iosched: Conv... |
3292 |
u64 last_sync = ktime_get_ns() - cfqd->last_delayed_sync; |
8e2967555 cfq-iosched: impl... |
3293 |
unsigned int depth; |
365722bb9 cfq-iosched: dela... |
3294 |
|
9a7f38c42 cfq-iosched: Conv... |
3295 |
depth = div64_u64(last_sync, cfqd->cfq_slice[1]); |
e00c54c36 cfq-iosched: don'... |
3296 3297 |
if (!depth && !cfqq->dispatched) depth = 1; |
8e2967555 cfq-iosched: impl... |
3298 3299 |
if (depth < max_dispatch) max_dispatch = depth; |
2f5cb7381 cfq-iosched: chan... |
3300 |
} |
3ed9a2965 cfq-iosched: impr... |
3301 |
|
0b182d617 cfq-iosched: abst... |
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 |
/* * 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)); if (!cfq_may_dispatch(cfqd, cfqq)) return false; /* * follow expired path, else get first next available */ rq = cfq_check_fifo(cfqq); if (!rq) rq = cfqq->next_rq; /* * insert request into driver dispatch list */ cfq_dispatch_insert(cfqd->queue, rq); if (!cfqd->active_cic) { |
c58698073 block, cfq: reorg... |
3334 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
0b182d617 cfq-iosched: abst... |
3335 |
|
c58698073 block, cfq: reorg... |
3336 |
atomic_long_inc(&cic->icq.ioc->refcount); |
0b182d617 cfq-iosched: abst... |
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 |
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... |
3360 |
return 0; |
2f5cb7381 cfq-iosched: chan... |
3361 |
/* |
0b182d617 cfq-iosched: abst... |
3362 |
* Dispatch a request from this cfqq, if it is allowed |
2f5cb7381 cfq-iosched: chan... |
3363 |
*/ |
0b182d617 cfq-iosched: abst... |
3364 3365 |
if (!cfq_dispatch_request(cfqd, cfqq)) return 0; |
2f5cb7381 cfq-iosched: chan... |
3366 |
cfqq->slice_dispatch++; |
b029195dd cfq-iosched: don'... |
3367 |
cfq_clear_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
3368 |
|
2f5cb7381 cfq-iosched: chan... |
3369 3370 3371 3372 3373 3374 3375 |
/* * 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... |
3376 |
cfqq->slice_end = ktime_get_ns() + 1; |
e5ff082e8 blkio: Fix anothe... |
3377 |
cfq_slice_expired(cfqd, 0); |
1da177e4c Linux-2.6.12-rc2 |
3378 |
} |
b217a903a cfq: fix the log ... |
3379 |
cfq_log_cfqq(cfqd, cfqq, "dispatched a request"); |
2f5cb7381 cfq-iosched: chan... |
3380 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
3381 |
} |
1da177e4c Linux-2.6.12-rc2 |
3382 |
/* |
5e7053747 [PATCH] cfq-iosch... |
3383 3384 |
* 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 |
3385 |
* |
b1c357696 blkio: Take care ... |
3386 |
* Each cfq queue took a reference on the parent group. Drop it now. |
1da177e4c Linux-2.6.12-rc2 |
3387 3388 3389 3390 |
* queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
3391 |
struct cfq_data *cfqd = cfqq->cfqd; |
0bbfeb832 cfq-iosched: Alwa... |
3392 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
3393 |
|
30d7b9448 block cfq: don't ... |
3394 |
BUG_ON(cfqq->ref <= 0); |
1da177e4c Linux-2.6.12-rc2 |
3395 |
|
30d7b9448 block cfq: don't ... |
3396 3397 |
cfqq->ref--; if (cfqq->ref) |
1da177e4c Linux-2.6.12-rc2 |
3398 |
return; |
7b679138b cfq-iosched: add ... |
3399 |
cfq_log_cfqq(cfqd, cfqq, "put_queue"); |
1da177e4c Linux-2.6.12-rc2 |
3400 |
BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
3401 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
b1c357696 blkio: Take care ... |
3402 |
cfqg = cfqq->cfqg; |
1da177e4c Linux-2.6.12-rc2 |
3403 |
|
28f95cbc3 cfq-iosched: remo... |
3404 |
if (unlikely(cfqd->active_queue == cfqq)) { |
e5ff082e8 blkio: Fix anothe... |
3405 |
__cfq_slice_expired(cfqd, cfqq, 0); |
23e018a1b block: get rid of... |
3406 |
cfq_schedule_dispatch(cfqd); |
28f95cbc3 cfq-iosched: remo... |
3407 |
} |
22e2c507c [PATCH] Update cf... |
3408 |
|
f04a64246 blkio: Keep queue... |
3409 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
3410 |
kmem_cache_free(cfq_pool, cfqq); |
eb7d8c07f cfq: fix cfqg ref... |
3411 |
cfqg_put(cfqg); |
1da177e4c Linux-2.6.12-rc2 |
3412 |
} |
d02a2c077 cfq-iosched: fix ... |
3413 |
static void cfq_put_cooperator(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
3414 |
{ |
df5fe3e8e cfq: merge cooper... |
3415 |
struct cfq_queue *__cfqq, *next; |
df5fe3e8e cfq: merge cooper... |
3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 |
/* * 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 ... |
3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 |
} 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... |
3442 |
|
89850f7ee [PATCH] cfq-iosch... |
3443 3444 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
3445 |
|
9b84cacd0 block, cfq: restr... |
3446 3447 3448 |
static void cfq_init_icq(struct io_cq *icq) { struct cfq_io_cq *cic = icq_to_cic(icq); |
9a7f38c42 cfq-iosched: Conv... |
3449 |
cic->ttime.last_end_request = ktime_get_ns(); |
9b84cacd0 block, cfq: restr... |
3450 |
} |
c58698073 block, cfq: reorg... |
3451 |
static void cfq_exit_icq(struct io_cq *icq) |
89850f7ee [PATCH] cfq-iosch... |
3452 |
{ |
c58698073 block, cfq: reorg... |
3453 |
struct cfq_io_cq *cic = icq_to_cic(icq); |
283287a52 block, cfq: misc ... |
3454 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
4faa3c815 cfq-iosched: do n... |
3455 |
|
563180a44 cfq-iosched: mino... |
3456 3457 3458 |
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... |
3459 |
} |
563180a44 cfq-iosched: mino... |
3460 3461 3462 |
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... |
3463 |
} |
89850f7ee [PATCH] cfq-iosch... |
3464 |
} |
abede6da2 cfq: pass around ... |
3465 |
static void cfq_init_prio_data(struct cfq_queue *cfqq, struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
3466 3467 3468 |
{ struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
3469 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
3470 |
return; |
598971bfb cfq: don't use ic... |
3471 |
ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); |
22e2c507c [PATCH] Update cf... |
3472 |
switch (ioprio_class) { |
fe094d98e cfq-iosched: make... |
3473 3474 3475 3476 3477 |
default: printk(KERN_ERR "cfq: bad prio %x ", ioprio_class); case IOPRIO_CLASS_NONE: /* |
6d63c2755 cfq-iosched: make... |
3478 |
* no prio set, inherit CPU scheduling settings |
fe094d98e cfq-iosched: make... |
3479 3480 |
*/ cfqq->ioprio = task_nice_ioprio(tsk); |
6d63c2755 cfq-iosched: make... |
3481 |
cfqq->ioprio_class = task_nice_ioclass(tsk); |
fe094d98e cfq-iosched: make... |
3482 3483 |
break; case IOPRIO_CLASS_RT: |
598971bfb cfq: don't use ic... |
3484 |
cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
fe094d98e cfq-iosched: make... |
3485 3486 3487 |
cfqq->ioprio_class = IOPRIO_CLASS_RT; break; case IOPRIO_CLASS_BE: |
598971bfb cfq: don't use ic... |
3488 |
cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
fe094d98e cfq-iosched: make... |
3489 3490 3491 3492 3493 3494 3495 |
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... |
3496 3497 3498 3499 3500 3501 3502 |
} /* * 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... |
3503 |
cfqq->org_ioprio_class = cfqq->ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
3504 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
3505 |
} |
598971bfb cfq: don't use ic... |
3506 |
static void check_ioprio_changed(struct cfq_io_cq *cic, struct bio *bio) |
22e2c507c [PATCH] Update cf... |
3507 |
{ |
598971bfb cfq: don't use ic... |
3508 |
int ioprio = cic->icq.ioc->ioprio; |
bca4b914b cfq-iosched: remo... |
3509 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
478a82b0e [PATCH] switch to... |
3510 |
struct cfq_queue *cfqq; |
35e6077cb [PATCH] cfq-iosch... |
3511 |
|
598971bfb cfq: don't use ic... |
3512 3513 3514 3515 3516 |
/* * 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... |
3517 |
return; |
563180a44 cfq-iosched: mino... |
3518 |
cfqq = cic_to_cfqq(cic, false); |
caaa5f9f0 [PATCH] cfq-iosch... |
3519 |
if (cfqq) { |
563180a44 cfq-iosched: mino... |
3520 |
cfq_put_queue(cfqq); |
2da8de0bb cfq-iosched: remo... |
3521 |
cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic, bio); |
563180a44 cfq-iosched: mino... |
3522 |
cic_set_cfqq(cic, cfqq, false); |
22e2c507c [PATCH] Update cf... |
3523 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3524 |
|
563180a44 cfq-iosched: mino... |
3525 |
cfqq = cic_to_cfqq(cic, true); |
caaa5f9f0 [PATCH] cfq-iosch... |
3526 3527 |
if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
598971bfb cfq: don't use ic... |
3528 3529 |
cic->ioprio = ioprio; |
22e2c507c [PATCH] Update cf... |
3530 |
} |
d5036d770 cfq-iosched: move... |
3531 |
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
3532 |
pid_t pid, bool is_sync) |
d5036d770 cfq-iosched: move... |
3533 3534 3535 3536 |
{ RB_CLEAR_NODE(&cfqq->rb_node); RB_CLEAR_NODE(&cfqq->p_node); INIT_LIST_HEAD(&cfqq->fifo); |
30d7b9448 block cfq: don't ... |
3537 |
cfqq->ref = 0; |
d5036d770 cfq-iosched: move... |
3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 |
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... |
3549 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
598971bfb cfq: don't use ic... |
3550 |
static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) |
24610333d blkio: Drop the r... |
3551 |
{ |
bca4b914b cfq-iosched: remo... |
3552 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
60a837077 cfq-iosched: char... |
3553 |
struct cfq_queue *cfqq; |
f4da80727 blkcg: remove blk... |
3554 |
uint64_t serial_nr; |
24610333d blkio: Drop the r... |
3555 |
|
598971bfb cfq: don't use ic... |
3556 |
rcu_read_lock(); |
f4da80727 blkcg: remove blk... |
3557 |
serial_nr = bio_blkcg(bio)->css.serial_nr; |
598971bfb cfq: don't use ic... |
3558 |
rcu_read_unlock(); |
24610333d blkio: Drop the r... |
3559 |
|
598971bfb cfq: don't use ic... |
3560 3561 3562 3563 |
/* * Check whether blkcg has changed. The condition may trigger * spuriously on a newly created cic but there's no harm. */ |
f4da80727 blkcg: remove blk... |
3564 |
if (unlikely(!cfqd) || likely(cic->blkcg_serial_nr == serial_nr)) |
598971bfb cfq: don't use ic... |
3565 |
return; |
24610333d blkio: Drop the r... |
3566 |
|
60a837077 cfq-iosched: char... |
3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 |
/* * 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... |
3583 |
} |
598971bfb cfq: don't use ic... |
3584 |
|
f4da80727 blkcg: remove blk... |
3585 |
cic->blkcg_serial_nr = serial_nr; |
24610333d blkio: Drop the r... |
3586 |
} |
598971bfb cfq: don't use ic... |
3587 3588 |
#else static inline void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) { } |
24610333d blkio: Drop the r... |
3589 |
#endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
c2dea2d1f cfq: async queue ... |
3590 |
static struct cfq_queue ** |
60a837077 cfq-iosched: char... |
3591 |
cfq_async_queue_prio(struct cfq_group *cfqg, int ioprio_class, int ioprio) |
c2dea2d1f cfq: async queue ... |
3592 |
{ |
fe094d98e cfq-iosched: make... |
3593 |
switch (ioprio_class) { |
c2dea2d1f cfq: async queue ... |
3594 |
case IOPRIO_CLASS_RT: |
60a837077 cfq-iosched: char... |
3595 |
return &cfqg->async_cfqq[0][ioprio]; |
598971bfb cfq: don't use ic... |
3596 3597 3598 |
case IOPRIO_CLASS_NONE: ioprio = IOPRIO_NORM; /* fall through */ |
c2dea2d1f cfq: async queue ... |
3599 |
case IOPRIO_CLASS_BE: |
60a837077 cfq-iosched: char... |
3600 |
return &cfqg->async_cfqq[1][ioprio]; |
c2dea2d1f cfq: async queue ... |
3601 |
case IOPRIO_CLASS_IDLE: |
60a837077 cfq-iosched: char... |
3602 |
return &cfqg->async_idle_cfqq; |
c2dea2d1f cfq: async queue ... |
3603 3604 3605 3606 |
default: BUG(); } } |
15c31be4d cfq-iosched: fix ... |
3607 |
static struct cfq_queue * |
abede6da2 cfq: pass around ... |
3608 |
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic, |
2da8de0bb cfq-iosched: remo... |
3609 |
struct bio *bio) |
15c31be4d cfq-iosched: fix ... |
3610 |
{ |
c6ce19432 cfq-iosched: fix ... |
3611 3612 |
int ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio); int ioprio = IOPRIO_PRIO_DATA(cic->ioprio); |
d4aad7ff0 cfq-iosched: fold... |
3613 |
struct cfq_queue **async_cfqq = NULL; |
4ebc1c61d cfq-iosched: simp... |
3614 |
struct cfq_queue *cfqq; |
322731ed0 cfq-iosched: move... |
3615 3616 3617 |
struct cfq_group *cfqg; rcu_read_lock(); |
ae1188963 blkcg: consolidat... |
3618 |
cfqg = cfq_lookup_cfqg(cfqd, bio_blkcg(bio)); |
322731ed0 cfq-iosched: move... |
3619 3620 3621 3622 |
if (!cfqg) { cfqq = &cfqd->oom_cfqq; goto out; } |
15c31be4d cfq-iosched: fix ... |
3623 |
|
c2dea2d1f cfq: async queue ... |
3624 |
if (!is_sync) { |
c6ce19432 cfq-iosched: fix ... |
3625 3626 3627 3628 3629 |
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... |
3630 |
async_cfqq = cfq_async_queue_prio(cfqg, ioprio_class, ioprio); |
c2dea2d1f cfq: async queue ... |
3631 |
cfqq = *async_cfqq; |
4ebc1c61d cfq-iosched: simp... |
3632 3633 |
if (cfqq) goto out; |
c2dea2d1f cfq: async queue ... |
3634 |
} |
d4aad7ff0 cfq-iosched: fold... |
3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 |
cfqq = kmem_cache_alloc_node(cfq_pool, GFP_NOWAIT | __GFP_ZERO, cfqd->queue->node); if (!cfqq) { cfqq = &cfqd->oom_cfqq; goto out; } 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 ... |
3646 |
|
d4aad7ff0 cfq-iosched: fold... |
3647 3648 |
if (async_cfqq) { /* a new async queue is created, pin and remember */ |
30d7b9448 block cfq: don't ... |
3649 |
cfqq->ref++; |
c2dea2d1f cfq: async queue ... |
3650 |
*async_cfqq = cfqq; |
15c31be4d cfq-iosched: fix ... |
3651 |
} |
4ebc1c61d cfq-iosched: simp... |
3652 |
out: |
30d7b9448 block cfq: don't ... |
3653 |
cfqq->ref++; |
322731ed0 cfq-iosched: move... |
3654 |
rcu_read_unlock(); |
15c31be4d cfq-iosched: fix ... |
3655 3656 |
return cfqq; } |
22e2c507c [PATCH] Update cf... |
3657 |
static void |
9a7f38c42 cfq-iosched: Conv... |
3658 |
__cfq_update_io_thinktime(struct cfq_ttime *ttime, u64 slice_idle) |
1da177e4c Linux-2.6.12-rc2 |
3659 |
{ |
9a7f38c42 cfq-iosched: Conv... |
3660 |
u64 elapsed = ktime_get_ns() - ttime->last_end_request; |
383cd7213 CFQ: move think t... |
3661 |
elapsed = min(elapsed, 2UL * slice_idle); |
db3b5848e When cfq I/O sche... |
3662 |
|
383cd7213 CFQ: move think t... |
3663 |
ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8; |
9a7f38c42 cfq-iosched: Conv... |
3664 3665 3666 |
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... |
3667 3668 3669 3670 |
} static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
c58698073 block, cfq: reorg... |
3671 |
struct cfq_io_cq *cic) |
383cd7213 CFQ: move think t... |
3672 |
{ |
f5f2b6ceb CFQ: add think ti... |
3673 |
if (cfq_cfqq_sync(cfqq)) { |
383cd7213 CFQ: move think t... |
3674 |
__cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle); |
f5f2b6ceb CFQ: add think ti... |
3675 3676 3677 |
__cfq_update_io_thinktime(&cfqq->service_tree->ttime, cfqd->cfq_slice_idle); } |
7700fc4f6 CFQ: add think ti... |
3678 3679 3680 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED __cfq_update_io_thinktime(&cfqq->cfqg->ttime, cfqd->cfq_group_idle); #endif |
22e2c507c [PATCH] Update cf... |
3681 |
} |
1da177e4c Linux-2.6.12-rc2 |
3682 |
|
206dc69b3 [BLOCK] cfq-iosch... |
3683 |
static void |
b2c18e1e0 cfq: calculate th... |
3684 |
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
6d048f531 cfq-iosched: deve... |
3685 |
struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
3686 |
{ |
3dde36dde cfq-iosched: rewo... |
3687 |
sector_t sdist = 0; |
41647e7a9 cfq-iosched: reth... |
3688 |
sector_t n_sec = blk_rq_sectors(rq); |
3dde36dde cfq-iosched: rewo... |
3689 3690 3691 3692 3693 3694 |
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... |
3695 |
|
3dde36dde cfq-iosched: rewo... |
3696 |
cfqq->seek_history <<= 1; |
41647e7a9 cfq-iosched: reth... |
3697 3698 3699 3700 |
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... |
3701 |
} |
1da177e4c Linux-2.6.12-rc2 |
3702 |
|
22e2c507c [PATCH] Update cf... |
3703 3704 3705 3706 3707 3708 |
/* * 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... |
3709 |
struct cfq_io_cq *cic) |
22e2c507c [PATCH] Update cf... |
3710 |
{ |
7b679138b cfq-iosched: add ... |
3711 |
int old_idle, enable_idle; |
1be92f2fc cfq-iosched: neve... |
3712 |
|
0871714e0 cfq-iosched: rela... |
3713 3714 3715 3716 |
/* * Don't idle for async or idle io prio class */ if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) |
1be92f2fc cfq-iosched: neve... |
3717 |
return; |
c265a7f41 cfq-iosched: get ... |
3718 |
enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
3719 |
|
76280aff1 cfq-iosched: idli... |
3720 3721 |
if (cfqq->queued[0] + cfqq->queued[1] >= 4) cfq_mark_cfqq_deep(cfqq); |
749ef9f84 cfq: improve fsyn... |
3722 3723 |
if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE)) enable_idle = 0; |
f6e8d01be block: add io_con... |
3724 |
else if (!atomic_read(&cic->icq.ioc->active_ref) || |
c58698073 block, cfq: reorg... |
3725 3726 |
!cfqd->cfq_slice_idle || (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) |
22e2c507c [PATCH] Update cf... |
3727 |
enable_idle = 0; |
383cd7213 CFQ: move think t... |
3728 3729 |
else if (sample_valid(cic->ttime.ttime_samples)) { if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle) |
22e2c507c [PATCH] Update cf... |
3730 3731 3732 |
enable_idle = 0; else enable_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
3733 |
} |
7b679138b cfq-iosched: add ... |
3734 3735 3736 3737 3738 3739 3740 |
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... |
3741 |
} |
1da177e4c Linux-2.6.12-rc2 |
3742 |
|
22e2c507c [PATCH] Update cf... |
3743 3744 3745 3746 |
/* * 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... |
3747 |
static bool |
22e2c507c [PATCH] Update cf... |
3748 |
cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
3749 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
3750 |
{ |
6d048f531 cfq-iosched: deve... |
3751 |
struct cfq_queue *cfqq; |
22e2c507c [PATCH] Update cf... |
3752 |
|
6d048f531 cfq-iosched: deve... |
3753 3754 |
cfqq = cfqd->active_queue; if (!cfqq) |
a6151c3a5 cfq-iosched: appl... |
3755 |
return false; |
22e2c507c [PATCH] Update cf... |
3756 |
|
6d048f531 cfq-iosched: deve... |
3757 |
if (cfq_class_idle(new_cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3758 |
return false; |
22e2c507c [PATCH] Update cf... |
3759 3760 |
if (cfq_class_idle(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3761 |
return true; |
1e3335de0 cfq-iosched: impr... |
3762 |
|
22e2c507c [PATCH] Update cf... |
3763 |
/* |
875feb63b cfq-iosched: Resp... |
3764 3765 3766 3767 3768 3769 |
* 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... |
3770 3771 3772 |
* if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
5e7053747 [PATCH] cfq-iosch... |
3773 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3774 |
return true; |
1e3335de0 cfq-iosched: impr... |
3775 |
|
3984aa552 cfq-iosched: Allo... |
3776 3777 3778 3779 3780 3781 |
/* * 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... |
3782 3783 3784 3785 |
return false; if (cfq_slice_used(cfqq)) return true; |
6c80731c7 cfq-iosched: Reor... |
3786 3787 3788 3789 3790 3791 3792 |
/* * 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... |
3793 |
/* Allow preemption only if we are idling on sync-noidle tree */ |
4d2ceea4c cfq-iosched: More... |
3794 |
if (cfqd->serving_wl_type == SYNC_NOIDLE_WORKLOAD && |
8682e1f15 blkio: Provide so... |
3795 |
cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD && |
8682e1f15 blkio: Provide so... |
3796 3797 |
RB_EMPTY_ROOT(&cfqq->sort_list)) return true; |
374f84ac3 [PATCH] cfq-iosch... |
3798 |
/* |
b53d1ed73 Revert "cfq: Remo... |
3799 3800 3801 |
* 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... |
3802 |
if ((rq->cmd_flags & REQ_PRIO) && !cfqq->prio_pending) |
b53d1ed73 Revert "cfq: Remo... |
3803 |
return true; |
d2d59e18a cfq-iosched: sche... |
3804 3805 3806 |
/* 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... |
3807 |
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3808 |
return false; |
1e3335de0 cfq-iosched: impr... |
3809 3810 3811 3812 3813 |
/* * if this request is as-good as one we would expect from the * current cfqq, let it preempt */ |
e9ce335df cfq-iosched: fix ... |
3814 |
if (cfq_rq_close(cfqd, cfqq, rq)) |
a6151c3a5 cfq-iosched: appl... |
3815 |
return true; |
1e3335de0 cfq-iosched: impr... |
3816 |
|
a6151c3a5 cfq-iosched: appl... |
3817 |
return false; |
22e2c507c [PATCH] Update cf... |
3818 3819 3820 3821 3822 3823 3824 3825 |
} /* * 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... |
3826 |
enum wl_type_t old_type = cfqq_type(cfqd->active_queue); |
7b679138b cfq-iosched: add ... |
3827 |
cfq_log_cfqq(cfqd, cfqq, "preempt"); |
df0793abb block,cfq: change... |
3828 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
3829 |
|
bf5722567 [PATCH] cfq-iosch... |
3830 |
/* |
f8ae6e3eb block cfq: make q... |
3831 3832 3833 |
* workload type is changed, don't save slice, otherwise preempt * doesn't happen */ |
df0793abb block,cfq: change... |
3834 |
if (old_type != cfqq_type(cfqq)) |
4d2ceea4c cfq-iosched: More... |
3835 |
cfqq->cfqg->saved_wl_slice = 0; |
f8ae6e3eb block cfq: make q... |
3836 3837 |
/* |
bf5722567 [PATCH] cfq-iosch... |
3838 3839 3840 3841 |
* 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 ... |
3842 3843 |
cfq_service_tree_add(cfqd, cfqq, 1); |
eda5e0c91 cfq-iosched: Don'... |
3844 |
|
62a37f6ba cfq-iosched: Don'... |
3845 3846 |
cfqq->slice_end = 0; cfq_mark_cfqq_slice_new(cfqq); |
22e2c507c [PATCH] Update cf... |
3847 3848 3849 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
3850 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
3851 3852 3853 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
3854 3855 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
3856 |
{ |
c58698073 block, cfq: reorg... |
3857 |
struct cfq_io_cq *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
3858 |
|
45333d5a3 cfq-iosched: fix ... |
3859 |
cfqd->rq_queued++; |
65299a3b7 block: separate p... |
3860 3861 |
if (rq->cmd_flags & REQ_PRIO) cfqq->prio_pending++; |
374f84ac3 [PATCH] cfq-iosch... |
3862 |
|
383cd7213 CFQ: move think t... |
3863 |
cfq_update_io_thinktime(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
3864 |
cfq_update_io_seektime(cfqd, cfqq, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
3865 |
cfq_update_idle_window(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
3866 |
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); |
22e2c507c [PATCH] Update cf... |
3867 3868 3869 |
if (cfqq == cfqd->active_queue) { /* |
b029195dd cfq-iosched: don'... |
3870 3871 3872 |
* 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'... |
3873 3874 |
* 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... |
3875 3876 3877 |
* 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... |
3878 |
*/ |
d6ceb25e8 cfq-iosched: don'... |
3879 |
if (cfq_cfqq_wait_request(cfqq)) { |
09cbfeaf1 mm, fs: get rid o... |
3880 |
if (blk_rq_bytes(rq) > PAGE_SIZE || |
2d8707229 cfq-iosched: twea... |
3881 |
cfqd->busy_queues > 1) { |
812df48d1 blkio: Add more d... |
3882 |
cfq_del_timer(cfqd, cfqq); |
554554f60 cfq: Remove wait_... |
3883 |
cfq_clear_cfqq_wait_request(cfqq); |
24ecfbe27 block: add blk_ru... |
3884 |
__blk_run_queue(cfqd->queue); |
a11cdaa7a block: Update to ... |
3885 |
} else { |
155fead9b blkcg: move blkio... |
3886 |
cfqg_stats_update_idle_time(cfqq->cfqg); |
bf7919371 blkio: Set must_d... |
3887 |
cfq_mark_cfqq_must_dispatch(cfqq); |
a11cdaa7a block: Update to ... |
3888 |
} |
d6ceb25e8 cfq-iosched: don'... |
3889 |
} |
5e7053747 [PATCH] cfq-iosch... |
3890 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
3891 3892 3893 |
/* * 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... |
3894 3895 |
* 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... |
3896 3897 |
*/ cfq_preempt_queue(cfqd, cfqq); |
24ecfbe27 block: add blk_ru... |
3898 |
__blk_run_queue(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
3899 |
} |
1da177e4c Linux-2.6.12-rc2 |
3900 |
} |
165125e1e [BLOCK] Get rid o... |
3901 |
static void cfq_insert_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3902 |
{ |
b4878f245 [PATCH] 02/05: up... |
3903 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
3904 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
3905 |
|
7b679138b cfq-iosched: add ... |
3906 |
cfq_log_cfqq(cfqd, cfqq, "insert_request"); |
abede6da2 cfq: pass around ... |
3907 |
cfq_init_prio_data(cfqq, RQ_CIC(rq)); |
1da177e4c Linux-2.6.12-rc2 |
3908 |
|
9a7f38c42 cfq-iosched: Conv... |
3909 |
rq->fifo_time = ktime_get_ns() + cfqd->cfq_fifo_expire[rq_is_sync(rq)]; |
22e2c507c [PATCH] Update cf... |
3910 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
aa6f6a3de cfq-iosched: prep... |
3911 |
cfq_add_rq_rb(rq); |
63a4cc248 blkg_rwstat: sepa... |
3912 |
cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group, req_op(rq), |
155fead9b blkcg: move blkio... |
3913 |
rq->cmd_flags); |
5e7053747 [PATCH] cfq-iosch... |
3914 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
3915 |
} |
45333d5a3 cfq-iosched: fix ... |
3916 3917 3918 3919 3920 3921 |
/* * 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... |
3922 |
struct cfq_queue *cfqq = cfqd->active_queue; |
53c583d22 cfq-iosched: requ... |
3923 3924 |
if (cfqd->rq_in_driver > cfqd->hw_tag_est_depth) cfqd->hw_tag_est_depth = cfqd->rq_in_driver; |
e459dd08f cfq-iosched: fix ... |
3925 3926 3927 |
if (cfqd->hw_tag == 1) return; |
45333d5a3 cfq-iosched: fix ... |
3928 3929 |
if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && |
53c583d22 cfq-iosched: requ... |
3930 |
cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3931 |
return; |
1a1238a7d cfq-iosched: impr... |
3932 3933 3934 3935 3936 3937 3938 |
/* * 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... |
3939 |
CFQ_HW_QUEUE_MIN && cfqd->rq_in_driver < CFQ_HW_QUEUE_MIN) |
1a1238a7d cfq-iosched: impr... |
3940 |
return; |
45333d5a3 cfq-iosched: fix ... |
3941 3942 |
if (cfqd->hw_tag_samples++ < 50) return; |
e459dd08f cfq-iosched: fix ... |
3943 |
if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3944 3945 3946 |
cfqd->hw_tag = 1; else cfqd->hw_tag = 0; |
45333d5a3 cfq-iosched: fix ... |
3947 |
} |
7667aa063 cfq-iosched: Take... |
3948 3949 |
static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
c58698073 block, cfq: reorg... |
3950 |
struct cfq_io_cq *cic = cfqd->active_cic; |
9a7f38c42 cfq-iosched: Conv... |
3951 |
u64 now = ktime_get_ns(); |
7667aa063 cfq-iosched: Take... |
3952 |
|
02a8f01b5 cfq-iosched: Don'... |
3953 3954 3955 |
/* If the queue already has requests, don't wait */ if (!RB_EMPTY_ROOT(&cfqq->sort_list)) return false; |
7667aa063 cfq-iosched: Take... |
3956 3957 3958 |
/* If there are other queues in the group, don't wait */ if (cfqq->cfqg->nr_cfqq > 1) return false; |
7700fc4f6 CFQ: add think ti... |
3959 3960 3961 |
/* 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... |
3962 3963 3964 3965 |
if (cfq_slice_used(cfqq)) return true; /* if slice left is less than think time, wait busy */ |
383cd7213 CFQ: move think t... |
3966 |
if (cic && sample_valid(cic->ttime.ttime_samples) |
9a7f38c42 cfq-iosched: Conv... |
3967 |
&& (cfqq->slice_end - now < cic->ttime.ttime_mean)) |
7667aa063 cfq-iosched: Take... |
3968 3969 3970 3971 3972 3973 3974 3975 3976 |
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... |
3977 |
if (cfqq->slice_end - now <= jiffies_to_nsecs(1)) |
7667aa063 cfq-iosched: Take... |
3978 3979 3980 3981 |
return true; return false; } |
165125e1e [BLOCK] Get rid o... |
3982 |
static void cfq_completed_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3983 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3984 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
3985 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
3986 |
const int sync = rq_is_sync(rq); |
9a7f38c42 cfq-iosched: Conv... |
3987 |
u64 now = ktime_get_ns(); |
1da177e4c Linux-2.6.12-rc2 |
3988 |
|
33659ebba block: remove wra... |
3989 3990 |
cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", !!(rq->cmd_flags & REQ_NOIDLE)); |
1da177e4c Linux-2.6.12-rc2 |
3991 |
|
45333d5a3 cfq-iosched: fix ... |
3992 |
cfq_update_hw_tag(cfqd); |
53c583d22 cfq-iosched: requ... |
3993 |
WARN_ON(!cfqd->rq_in_driver); |
6d048f531 cfq-iosched: deve... |
3994 |
WARN_ON(!cfqq->dispatched); |
53c583d22 cfq-iosched: requ... |
3995 |
cfqd->rq_in_driver--; |
6d048f531 cfq-iosched: deve... |
3996 |
cfqq->dispatched--; |
80bdf0c78 cfq-iosched: Impl... |
3997 |
(RQ_CFQG(rq))->dispatched--; |
155fead9b blkcg: move blkio... |
3998 |
cfqg_stats_update_completion(cfqq->cfqg, rq_start_time_ns(rq), |
63a4cc248 blkg_rwstat: sepa... |
3999 4000 |
rq_io_start_time_ns(rq), req_op(rq), rq->cmd_flags); |
1da177e4c Linux-2.6.12-rc2 |
4001 |
|
53c583d22 cfq-iosched: requ... |
4002 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--; |
3ed9a2965 cfq-iosched: impr... |
4003 |
|
365722bb9 cfq-iosched: dela... |
4004 |
if (sync) { |
34b98d03b cfq-iosched: Rena... |
4005 |
struct cfq_rb_root *st; |
f5f2b6ceb CFQ: add think ti... |
4006 |
|
383cd7213 CFQ: move think t... |
4007 |
RQ_CIC(rq)->ttime.last_end_request = now; |
f5f2b6ceb CFQ: add think ti... |
4008 4009 |
if (cfq_cfqq_on_rr(cfqq)) |
34b98d03b cfq-iosched: Rena... |
4010 |
st = cfqq->service_tree; |
f5f2b6ceb CFQ: add think ti... |
4011 |
else |
34b98d03b cfq-iosched: Rena... |
4012 4013 4014 4015 |
st = st_for(cfqq->cfqg, cfqq_class(cfqq), cfqq_type(cfqq)); st->ttime.last_end_request = now; |
149321a61 cfq-iosched: Fix ... |
4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 |
/* * 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... |
4026 |
cfqd->last_delayed_sync = now; |
365722bb9 cfq-iosched: dela... |
4027 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
4028 |
|
7700fc4f6 CFQ: add think ti... |
4029 4030 4031 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED cfqq->cfqg->ttime.last_end_request = now; #endif |
caaa5f9f0 [PATCH] cfq-iosch... |
4032 4033 4034 4035 4036 |
/* * 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 ... |
4037 |
const bool cfqq_empty = RB_EMPTY_ROOT(&cfqq->sort_list); |
44f7c1606 cfq-iosched: defe... |
4038 4039 4040 4041 |
if (cfq_cfqq_slice_new(cfqq)) { cfq_set_prio_slice(cfqd, cfqq); cfq_clear_cfqq_slice_new(cfqq); } |
f75edf2dc blkio: Wait for c... |
4042 4043 |
/* |
7667aa063 cfq-iosched: Take... |
4044 4045 |
* Should we wait for next request to come in before we expire * the queue. |
f75edf2dc blkio: Wait for c... |
4046 |
*/ |
7667aa063 cfq-iosched: Take... |
4047 |
if (cfq_should_wait_busy(cfqd, cfqq)) { |
9a7f38c42 cfq-iosched: Conv... |
4048 |
u64 extend_sl = cfqd->cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
4049 4050 |
if (!cfqd->cfq_slice_idle) extend_sl = cfqd->cfq_group_idle; |
9a7f38c42 cfq-iosched: Conv... |
4051 |
cfqq->slice_end = now + extend_sl; |
f75edf2dc blkio: Wait for c... |
4052 |
cfq_mark_cfqq_wait_busy(cfqq); |
b1ffe737f cfq-iosched: Add ... |
4053 |
cfq_log_cfqq(cfqd, cfqq, "will busy wait"); |
f75edf2dc blkio: Wait for c... |
4054 |
} |
a36e71f99 cfq-iosched: add ... |
4055 |
/* |
8e550632c cfq-iosched: fix ... |
4056 4057 4058 4059 4060 4061 |
* 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 ... |
4062 |
*/ |
0871714e0 cfq-iosched: rela... |
4063 |
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) |
e5ff082e8 blkio: Fix anothe... |
4064 |
cfq_slice_expired(cfqd, 1); |
8e550632c cfq-iosched: fix ... |
4065 4066 |
else if (sync && cfqq_empty && !cfq_close_cooperator(cfqd, cfqq)) { |
749ef9f84 cfq: improve fsyn... |
4067 |
cfq_arm_slice_timer(cfqd); |
8e550632c cfq-iosched: fix ... |
4068 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
4069 |
} |
6d048f531 cfq-iosched: deve... |
4070 |
|
53c583d22 cfq-iosched: requ... |
4071 |
if (!cfqd->rq_in_driver) |
23e018a1b block: get rid of... |
4072 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
4073 |
} |
b8269db45 cfq-iosched: temp... |
4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 |
static void cfqq_boost_on_prio(struct cfq_queue *cfqq, int op_flags) { /* * 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. */ if (!(op_flags & REQ_PRIO)) { 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... |
4091 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
4092 |
{ |
1b379d8da cfq-iosched: get ... |
4093 |
if (cfq_cfqq_wait_request(cfqq) && !cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
4094 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
4095 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
4096 |
} |
1da177e4c Linux-2.6.12-rc2 |
4097 |
|
22e2c507c [PATCH] Update cf... |
4098 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
4099 |
} |
ba568ea0a block: prepare el... |
4100 |
static int cfq_may_queue(struct request_queue *q, int op, int op_flags) |
22e2c507c [PATCH] Update cf... |
4101 4102 4103 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; |
c58698073 block, cfq: reorg... |
4104 |
struct cfq_io_cq *cic; |
22e2c507c [PATCH] Update cf... |
4105 4106 4107 4108 4109 4110 4111 4112 |
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 ... |
4113 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
4114 4115 |
if (!cic) return ELV_MQUEUE_MAY; |
d9d8c5c48 block: convert is... |
4116 |
cfqq = cic_to_cfqq(cic, rw_is_sync(op, op_flags)); |
22e2c507c [PATCH] Update cf... |
4117 |
if (cfqq) { |
abede6da2 cfq: pass around ... |
4118 |
cfq_init_prio_data(cfqq, cic); |
b8269db45 cfq-iosched: temp... |
4119 |
cfqq_boost_on_prio(cfqq, op_flags); |
22e2c507c [PATCH] Update cf... |
4120 |
|
89850f7ee [PATCH] cfq-iosch... |
4121 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
4122 4123 4124 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
4125 |
} |
1da177e4c Linux-2.6.12-rc2 |
4126 4127 4128 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
4129 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
4130 |
{ |
5e7053747 [PATCH] cfq-iosch... |
4131 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
4132 |
|
5e7053747 [PATCH] cfq-iosch... |
4133 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
4134 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
4135 |
|
22e2c507c [PATCH] Update cf... |
4136 4137 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
4138 |
|
7f1dc8a2d blkio: Fix blkio ... |
4139 |
/* Put down rq reference on cfqg */ |
eb7d8c07f cfq: fix cfqg ref... |
4140 |
cfqg_put(RQ_CFQG(rq)); |
a612fddf0 block, cfq: move ... |
4141 4142 |
rq->elv.priv[0] = NULL; rq->elv.priv[1] = NULL; |
7f1dc8a2d blkio: Fix blkio ... |
4143 |
|
1da177e4c Linux-2.6.12-rc2 |
4144 4145 4146 |
cfq_put_queue(cfqq); } } |
df5fe3e8e cfq: merge cooper... |
4147 |
static struct cfq_queue * |
c58698073 block, cfq: reorg... |
4148 |
cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_cq *cic, |
df5fe3e8e cfq: merge cooper... |
4149 4150 4151 4152 |
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... |
4153 |
cfq_mark_cfqq_coop(cfqq->new_cfqq); |
df5fe3e8e cfq: merge cooper... |
4154 4155 4156 |
cfq_put_queue(cfqq); return cic_to_cfqq(cic, 1); } |
e6c5bc737 cfq: break apart ... |
4157 4158 4159 4160 4161 |
/* * 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... |
4162 |
split_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq) |
e6c5bc737 cfq: break apart ... |
4163 4164 |
{ if (cfqq_process_refs(cfqq) == 1) { |
e6c5bc737 cfq: break apart ... |
4165 4166 |
cfqq->pid = current->pid; cfq_clear_cfqq_coop(cfqq); |
ae54abed6 cfq-iosched: spli... |
4167 |
cfq_clear_cfqq_split_coop(cfqq); |
e6c5bc737 cfq: break apart ... |
4168 4169 4170 4171 |
return cfqq; } cic_set_cfqq(cic, NULL, 1); |
d02a2c077 cfq-iosched: fix ... |
4172 4173 |
cfq_put_cooperator(cfqq); |
e6c5bc737 cfq: break apart ... |
4174 4175 4176 |
cfq_put_queue(cfqq); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
4177 |
/* |
22e2c507c [PATCH] Update cf... |
4178 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
4179 |
*/ |
22e2c507c [PATCH] Update cf... |
4180 |
static int |
852c788f8 block: implement ... |
4181 4182 |
cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
4183 4184 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
f1f8cc946 block, cfq: move ... |
4185 |
struct cfq_io_cq *cic = icq_to_cic(rq->elv.icq); |
1da177e4c Linux-2.6.12-rc2 |
4186 |
const int rw = rq_data_dir(rq); |
a6151c3a5 cfq-iosched: appl... |
4187 |
const bool is_sync = rq_is_sync(rq); |
22e2c507c [PATCH] Update cf... |
4188 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
4189 |
|
216284c35 block, cfq: fix r... |
4190 |
spin_lock_irq(q->queue_lock); |
f1f8cc946 block, cfq: move ... |
4191 |
|
598971bfb cfq: don't use ic... |
4192 4193 |
check_ioprio_changed(cic, bio); check_blkcg_changed(cic, bio); |
e6c5bc737 cfq: break apart ... |
4194 |
new_queue: |
91fac317a cfq-iosched: get ... |
4195 |
cfqq = cic_to_cfqq(cic, is_sync); |
32f2e807a cfq-iosched: rese... |
4196 |
if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
bce6133b0 cfq-iosched: fix ... |
4197 4198 |
if (cfqq) cfq_put_queue(cfqq); |
2da8de0bb cfq-iosched: remo... |
4199 |
cfqq = cfq_get_queue(cfqd, is_sync, cic, bio); |
91fac317a cfq-iosched: get ... |
4200 |
cic_set_cfqq(cic, cfqq, is_sync); |
df5fe3e8e cfq: merge cooper... |
4201 4202 |
} else { /* |
e6c5bc737 cfq: break apart ... |
4203 4204 |
* If the queue was seeky for too long, break it apart. */ |
ae54abed6 cfq-iosched: spli... |
4205 |
if (cfq_cfqq_coop(cfqq) && cfq_cfqq_split_coop(cfqq)) { |
e6c5bc737 cfq: break apart ... |
4206 4207 4208 4209 4210 4211 4212 |
cfq_log_cfqq(cfqd, cfqq, "breaking apart cfqq"); cfqq = split_cfqq(cic, cfqq); if (!cfqq) goto new_queue; } /* |
df5fe3e8e cfq: merge cooper... |
4213 4214 4215 4216 4217 4218 4219 |
* 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 ... |
4220 |
} |
1da177e4c Linux-2.6.12-rc2 |
4221 4222 |
cfqq->allocated[rw]++; |
1da177e4c Linux-2.6.12-rc2 |
4223 |
|
6fae9c251 Merge commit 'v2.... |
4224 |
cfqq->ref++; |
eb7d8c07f cfq: fix cfqg ref... |
4225 |
cfqg_get(cfqq->cfqg); |
a612fddf0 block, cfq: move ... |
4226 |
rq->elv.priv[0] = cfqq; |
1adaf3dde blkcg: move refcn... |
4227 |
rq->elv.priv[1] = cfqq->cfqg; |
216284c35 block, cfq: fix r... |
4228 |
spin_unlock_irq(q->queue_lock); |
5e7053747 [PATCH] cfq-iosch... |
4229 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
4230 |
} |
65f27f384 WorkStruct: Pass ... |
4231 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
4232 |
{ |
65f27f384 WorkStruct: Pass ... |
4233 |
struct cfq_data *cfqd = |
23e018a1b block: get rid of... |
4234 |
container_of(work, struct cfq_data, unplug_work); |
165125e1e [BLOCK] Get rid o... |
4235 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
4236 |
|
40bb54d19 cfq-iosched: no n... |
4237 |
spin_lock_irq(q->queue_lock); |
24ecfbe27 block: add blk_ru... |
4238 |
__blk_run_queue(cfqd->queue); |
40bb54d19 cfq-iosched: no n... |
4239 |
spin_unlock_irq(q->queue_lock); |
22e2c507c [PATCH] Update cf... |
4240 4241 4242 4243 4244 |
} /* * Timer running if the active_queue is currently idling inside its time slice */ |
911483258 cfq-iosched: Conv... |
4245 |
static enum hrtimer_restart cfq_idle_slice_timer(struct hrtimer *timer) |
22e2c507c [PATCH] Update cf... |
4246 |
{ |
911483258 cfq-iosched: Conv... |
4247 4248 |
struct cfq_data *cfqd = container_of(timer, struct cfq_data, idle_slice_timer); |
22e2c507c [PATCH] Update cf... |
4249 4250 |
struct cfq_queue *cfqq; unsigned long flags; |
3c6bd2f87 cfq-iosched: chec... |
4251 |
int timed_out = 1; |
22e2c507c [PATCH] Update cf... |
4252 |
|
7b679138b cfq-iosched: add ... |
4253 |
cfq_log(cfqd, "idle timer fired"); |
22e2c507c [PATCH] Update cf... |
4254 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
fe094d98e cfq-iosched: make... |
4255 4256 |
cfqq = cfqd->active_queue; if (cfqq) { |
3c6bd2f87 cfq-iosched: chec... |
4257 |
timed_out = 0; |
22e2c507c [PATCH] Update cf... |
4258 |
/* |
b029195dd cfq-iosched: don'... |
4259 4260 4261 4262 4263 4264 |
* We saw a request before the queue expired, let it through */ if (cfq_cfqq_must_dispatch(cfqq)) goto out_kick; /* |
22e2c507c [PATCH] Update cf... |
4265 4266 |
* expired */ |
44f7c1606 cfq-iosched: defe... |
4267 |
if (cfq_slice_used(cfqq)) |
22e2c507c [PATCH] Update cf... |
4268 4269 4270 4271 4272 4273 |
goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
4274 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
4275 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
4276 4277 4278 4279 |
/* * not expired and it has a request pending, let it dispatch */ |
75e50984f cfq-iosched: kill... |
4280 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
4281 |
goto out_kick; |
76280aff1 cfq-iosched: idli... |
4282 4283 4284 4285 4286 |
/* * Queue depth flag is reset only when the idle didn't succeed */ cfq_clear_cfqq_deep(cfqq); |
22e2c507c [PATCH] Update cf... |
4287 4288 |
} expire: |
e5ff082e8 blkio: Fix anothe... |
4289 |
cfq_slice_expired(cfqd, timed_out); |
22e2c507c [PATCH] Update cf... |
4290 |
out_kick: |
23e018a1b block: get rid of... |
4291 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
4292 4293 |
out_cont: spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
911483258 cfq-iosched: Conv... |
4294 |
return HRTIMER_NORESTART; |
22e2c507c [PATCH] Update cf... |
4295 |
} |
3b18152c3 [PATCH] CFQ io sc... |
4296 4297 |
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) { |
911483258 cfq-iosched: Conv... |
4298 |
hrtimer_cancel(&cfqd->idle_slice_timer); |
23e018a1b block: get rid of... |
4299 |
cancel_work_sync(&cfqd->unplug_work); |
3b18152c3 [PATCH] CFQ io sc... |
4300 |
} |
22e2c507c [PATCH] Update cf... |
4301 |
|
b374d18a4 block: get rid of... |
4302 |
static void cfq_exit_queue(struct elevator_queue *e) |
1da177e4c Linux-2.6.12-rc2 |
4303 |
{ |
22e2c507c [PATCH] Update cf... |
4304 |
struct cfq_data *cfqd = e->elevator_data; |
165125e1e [BLOCK] Get rid o... |
4305 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
4306 |
|
3b18152c3 [PATCH] CFQ io sc... |
4307 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
4308 |
|
d9ff41879 [PATCH] make cfq_... |
4309 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
4310 |
|
d9ff41879 [PATCH] make cfq_... |
4311 |
if (cfqd->active_queue) |
e5ff082e8 blkio: Fix anothe... |
4312 |
__cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
4313 |
|
03aa264ac blkcg: let blkcg ... |
4314 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
4315 |
cfq_shutdown_timer_wq(cfqd); |
ffea73fc7 block: blkcg_poli... |
4316 4317 4318 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED blkcg_deactivate_policy(q, &blkcg_policy_cfq); #else |
f51b802c1 blkcg: use the us... |
4319 |
kfree(cfqd->root_group); |
2abae55f5 cfq-iosched: Fix ... |
4320 |
#endif |
56edf7d75 cfq-iosched: Fix ... |
4321 |
kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
4322 |
} |
d50235b7b elevator: Fix a r... |
4323 |
static int cfq_init_queue(struct request_queue *q, struct elevator_type *e) |
1da177e4c Linux-2.6.12-rc2 |
4324 4325 |
{ struct cfq_data *cfqd; |
3c798398e blkcg: mass renam... |
4326 |
struct blkcg_gq *blkg __maybe_unused; |
a2b1693ba blkcg: implement ... |
4327 |
int i, ret; |
d50235b7b elevator: Fix a r... |
4328 4329 4330 4331 4332 |
struct elevator_queue *eq; eq = elevator_alloc(q, e); if (!eq) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
4333 |
|
c1b511eb2 block: Convert km... |
4334 |
cfqd = kzalloc_node(sizeof(*cfqd), GFP_KERNEL, q->node); |
d50235b7b elevator: Fix a r... |
4335 4336 |
if (!cfqd) { kobject_put(&eq->kobj); |
b2fab5acd elevator: make el... |
4337 |
return -ENOMEM; |
d50235b7b elevator: Fix a r... |
4338 4339 |
} eq->elevator_data = cfqd; |
80b15c738 cfq-iosched: comp... |
4340 |
|
f51b802c1 blkcg: use the us... |
4341 |
cfqd->queue = q; |
d50235b7b elevator: Fix a r... |
4342 4343 4344 |
spin_lock_irq(q->queue_lock); q->elevator = eq; spin_unlock_irq(q->queue_lock); |
f51b802c1 blkcg: use the us... |
4345 |
|
1fa8f6d68 blkio: Introduce ... |
4346 4347 |
/* Init root service tree */ cfqd->grp_service_tree = CFQ_RB_ROOT; |
f51b802c1 blkcg: use the us... |
4348 |
/* Init root group and prefer root group over other groups by default */ |
25fb5169d blkio: Dynamic cf... |
4349 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4350 |
ret = blkcg_activate_policy(q, &blkcg_policy_cfq); |
a2b1693ba blkcg: implement ... |
4351 4352 |
if (ret) goto out_free; |
f51b802c1 blkcg: use the us... |
4353 |
|
a2b1693ba blkcg: implement ... |
4354 |
cfqd->root_group = blkg_to_cfqg(q->root_blkg); |
f51b802c1 blkcg: use the us... |
4355 |
#else |
a2b1693ba blkcg: implement ... |
4356 |
ret = -ENOMEM; |
f51b802c1 blkcg: use the us... |
4357 4358 |
cfqd->root_group = kzalloc_node(sizeof(*cfqd->root_group), GFP_KERNEL, cfqd->queue->node); |
a2b1693ba blkcg: implement ... |
4359 4360 |
if (!cfqd->root_group) goto out_free; |
5624a4e44 blk-throttle: Mak... |
4361 |
|
a2b1693ba blkcg: implement ... |
4362 |
cfq_init_cfqg_base(cfqd->root_group); |
3ecca6293 blkcg: s/CFQ_WEIG... |
4363 4364 |
cfqd->root_group->weight = 2 * CFQ_WEIGHT_LEGACY_DFL; cfqd->root_group->leaf_weight = 2 * CFQ_WEIGHT_LEGACY_DFL; |
69d7fde59 blkcg: use CGROUP... |
4365 |
#endif |
5624a4e44 blk-throttle: Mak... |
4366 |
|
26a2ac009 cfq-iosched: clea... |
4367 4368 4369 4370 4371 4372 4373 |
/* * 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 ... |
4374 |
/* |
d4aad7ff0 cfq-iosched: fold... |
4375 |
* Our fallback cfqq if cfq_get_queue() runs into OOM issues. |
6118b70b3 cfq-iosched: get ... |
4376 |
* Grab a permanent reference to it, so that the normal code flow |
f51b802c1 blkcg: use the us... |
4377 4378 4379 |
* 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 ... |
4380 4381 |
*/ cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0); |
30d7b9448 block cfq: don't ... |
4382 |
cfqd->oom_cfqq.ref++; |
1adaf3dde blkcg: move refcn... |
4383 4384 |
spin_lock_irq(q->queue_lock); |
f51b802c1 blkcg: use the us... |
4385 |
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group); |
eb7d8c07f cfq: fix cfqg ref... |
4386 |
cfqg_put(cfqd->root_group); |
1adaf3dde blkcg: move refcn... |
4387 |
spin_unlock_irq(q->queue_lock); |
1da177e4c Linux-2.6.12-rc2 |
4388 |
|
911483258 cfq-iosched: Conv... |
4389 4390 |
hrtimer_init(&cfqd->idle_slice_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
22e2c507c [PATCH] Update cf... |
4391 |
cfqd->idle_slice_timer.function = cfq_idle_slice_timer; |
22e2c507c [PATCH] Update cf... |
4392 |
|
23e018a1b block: get rid of... |
4393 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
4394 |
|
1da177e4c Linux-2.6.12-rc2 |
4395 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
4396 4397 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
4398 4399 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
4400 4401 |
cfqd->cfq_slice[0] = cfq_slice_async; cfqd->cfq_slice[1] = cfq_slice_sync; |
5bf14c072 block: Make cfq_t... |
4402 |
cfqd->cfq_target_latency = cfq_target_latency; |
22e2c507c [PATCH] Update cf... |
4403 |
cfqd->cfq_slice_async_rq = cfq_slice_async_rq; |
0bb979472 cfq-iosched: fix ... |
4404 |
cfqd->cfq_slice_idle = cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
4405 |
cfqd->cfq_group_idle = cfq_group_idle; |
963b72fc6 cfq-iosched: rena... |
4406 |
cfqd->cfq_latency = 1; |
e459dd08f cfq-iosched: fix ... |
4407 |
cfqd->hw_tag = -1; |
edc71131c cfq-iosched: comm... |
4408 4409 4410 4411 |
/* * 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... |
4412 |
cfqd->last_delayed_sync = ktime_get_ns() - NSEC_PER_SEC; |
b2fab5acd elevator: make el... |
4413 |
return 0; |
a2b1693ba blkcg: implement ... |
4414 4415 4416 |
out_free: kfree(cfqd); |
d50235b7b elevator: Fix a r... |
4417 |
kobject_put(&eq->kobj); |
a2b1693ba blkcg: implement ... |
4418 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
4419 |
} |
0bb979472 cfq-iosched: fix ... |
4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
4431 4432 4433 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
4434 4435 4436 |
static ssize_t cfq_var_show(unsigned int var, char *page) { |
176167ad9 block: Fix format... |
4437 4438 |
return sprintf(page, "%u ", var); |
1da177e4c Linux-2.6.12-rc2 |
4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 |
} static ssize_t cfq_var_store(unsigned int *var, const char *page, size_t count) { char *p = (char *) page; *var = simple_strtoul(p, &p, 10); return count; } |
1da177e4c Linux-2.6.12-rc2 |
4449 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
b374d18a4 block: get rid of... |
4450 |
static ssize_t __FUNC(struct elevator_queue *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
4451 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
4452 |
struct cfq_data *cfqd = e->elevator_data; \ |
9a7f38c42 cfq-iosched: Conv... |
4453 |
u64 __data = __VAR; \ |
1da177e4c Linux-2.6.12-rc2 |
4454 |
if (__CONV) \ |
9a7f38c42 cfq-iosched: Conv... |
4455 |
__data = div_u64(__data, NSEC_PER_MSEC); \ |
1da177e4c Linux-2.6.12-rc2 |
4456 4457 4458 |
return cfq_var_show(__data, (page)); \ } SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
22e2c507c [PATCH] Update cf... |
4459 4460 |
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... |
4461 4462 |
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... |
4463 |
SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); |
80bdf0c78 cfq-iosched: Impl... |
4464 |
SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1); |
22e2c507c [PATCH] Update cf... |
4465 4466 4467 |
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... |
4468 |
SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); |
5bf14c072 block: Make cfq_t... |
4469 |
SHOW_FUNCTION(cfq_target_latency_show, cfqd->cfq_target_latency, 1); |
1da177e4c Linux-2.6.12-rc2 |
4470 |
#undef SHOW_FUNCTION |
d2d481d04 cfq-iosched: Expo... |
4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 |
#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 |
4485 |
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
b374d18a4 block: get rid of... |
4486 |
static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
4487 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
4488 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
4489 4490 4491 4492 4493 4494 4495 |
unsigned int __data; \ int ret = cfq_var_store(&__data, (page), count); \ if (__data < (MIN)) \ __data = (MIN); \ else if (__data > (MAX)) \ __data = (MAX); \ if (__CONV) \ |
9a7f38c42 cfq-iosched: Conv... |
4496 |
*(__PTR) = (u64)__data * NSEC_PER_MSEC; \ |
1da177e4c Linux-2.6.12-rc2 |
4497 4498 4499 4500 4501 |
else \ *(__PTR) = __data; \ return ret; \ } STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
4502 4503 4504 4505 |
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... |
4506 |
STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
4507 4508 |
STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
4509 |
STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); |
80bdf0c78 cfq-iosched: Impl... |
4510 |
STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1); |
22e2c507c [PATCH] Update cf... |
4511 4512 |
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... |
4513 4514 |
STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, UINT_MAX, 0); |
963b72fc6 cfq-iosched: rena... |
4515 |
STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); |
5bf14c072 block: Make cfq_t... |
4516 |
STORE_FUNCTION(cfq_target_latency_store, &cfqd->cfq_target_latency, 1, UINT_MAX, 1); |
1da177e4c Linux-2.6.12-rc2 |
4517 |
#undef STORE_FUNCTION |
d2d481d04 cfq-iosched: Expo... |
4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 |
#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; \ unsigned int __data; \ int ret = cfq_var_store(&__data, (page), count); \ if (__data < (MIN)) \ __data = (MIN); \ else if (__data > (MAX)) \ __data = (MAX); \ *(__PTR) = (u64)__data * NSEC_PER_USEC; \ return ret; \ } 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... |
4537 4538 4539 4540 4541 |
#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... |
4542 4543 4544 4545 4546 |
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... |
4547 |
CFQ_ATTR(slice_sync_us), |
e572ec7e4 [PATCH] fix rmmod... |
4548 |
CFQ_ATTR(slice_async), |
d2d481d04 cfq-iosched: Expo... |
4549 |
CFQ_ATTR(slice_async_us), |
e572ec7e4 [PATCH] fix rmmod... |
4550 4551 |
CFQ_ATTR(slice_async_rq), CFQ_ATTR(slice_idle), |
d2d481d04 cfq-iosched: Expo... |
4552 |
CFQ_ATTR(slice_idle_us), |
80bdf0c78 cfq-iosched: Impl... |
4553 |
CFQ_ATTR(group_idle), |
d2d481d04 cfq-iosched: Expo... |
4554 |
CFQ_ATTR(group_idle_us), |
963b72fc6 cfq-iosched: rena... |
4555 |
CFQ_ATTR(low_latency), |
5bf14c072 block: Make cfq_t... |
4556 |
CFQ_ATTR(target_latency), |
d2d481d04 cfq-iosched: Expo... |
4557 |
CFQ_ATTR(target_latency_us), |
e572ec7e4 [PATCH] fix rmmod... |
4558 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
4559 |
}; |
1da177e4c Linux-2.6.12-rc2 |
4560 4561 4562 4563 4564 |
static struct elevator_type iosched_cfq = { .ops = { .elevator_merge_fn = cfq_merge, .elevator_merged_fn = cfq_merged_request, .elevator_merge_req_fn = cfq_merged_requests, |
72ef799b3 block: do not mer... |
4565 4566 |
.elevator_allow_bio_merge_fn = cfq_allow_bio_merge, .elevator_allow_rq_merge_fn = cfq_allow_rq_merge, |
812d40264 blkio: Add io_mer... |
4567 |
.elevator_bio_merged_fn = cfq_bio_merged, |
b4878f245 [PATCH] 02/05: up... |
4568 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
4569 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
4570 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
4571 |
.elevator_deactivate_req_fn = cfq_deactivate_request, |
1da177e4c Linux-2.6.12-rc2 |
4572 |
.elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
4573 4574 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
9b84cacd0 block, cfq: restr... |
4575 |
.elevator_init_icq_fn = cfq_init_icq, |
7e5a87944 block, cfq: move ... |
4576 |
.elevator_exit_icq_fn = cfq_exit_icq, |
1da177e4c Linux-2.6.12-rc2 |
4577 4578 4579 4580 4581 |
.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 ... |
4582 |
.elevator_registered_fn = cfq_registered_queue, |
1da177e4c Linux-2.6.12-rc2 |
4583 |
}, |
3d3c2379f block, cfq: move ... |
4584 4585 |
.icq_size = sizeof(struct cfq_io_cq), .icq_align = __alignof__(struct cfq_io_cq), |
3d1ab40f4 [PATCH] elevator_... |
4586 |
.elevator_attrs = cfq_attrs, |
3d3c2379f block, cfq: move ... |
4587 |
.elevator_name = "cfq", |
1da177e4c Linux-2.6.12-rc2 |
4588 4589 |
.elevator_owner = THIS_MODULE, }; |
3e2520668 blkio: Implement ... |
4590 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4591 |
static struct blkcg_policy blkcg_policy_cfq = { |
2ee867dcf blkcg: implement ... |
4592 |
.dfl_cftypes = cfq_blkcg_files, |
880f50e22 blkcg: mark exist... |
4593 |
.legacy_cftypes = cfq_blkcg_legacy_files, |
f9fcc2d39 blkcg: collapse b... |
4594 |
|
e4a9bde95 blkcg: replace bl... |
4595 |
.cpd_alloc_fn = cfq_cpd_alloc, |
e48453c38 block, cgroup: im... |
4596 |
.cpd_init_fn = cfq_cpd_init, |
e4a9bde95 blkcg: replace bl... |
4597 |
.cpd_free_fn = cfq_cpd_free, |
69d7fde59 blkcg: use CGROUP... |
4598 |
.cpd_bind_fn = cfq_cpd_bind, |
e4a9bde95 blkcg: replace bl... |
4599 |
|
001bea73e blkcg: replace bl... |
4600 |
.pd_alloc_fn = cfq_pd_alloc, |
f9fcc2d39 blkcg: collapse b... |
4601 |
.pd_init_fn = cfq_pd_init, |
0b39920b5 cfq-iosched: coll... |
4602 |
.pd_offline_fn = cfq_pd_offline, |
001bea73e blkcg: replace bl... |
4603 |
.pd_free_fn = cfq_pd_free, |
f9fcc2d39 blkcg: collapse b... |
4604 |
.pd_reset_stats_fn = cfq_pd_reset_stats, |
3e2520668 blkio: Implement ... |
4605 |
}; |
3e2520668 blkio: Implement ... |
4606 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
4607 4608 |
static int __init cfq_init(void) { |
3d3c2379f block, cfq: move ... |
4609 |
int ret; |
80bdf0c78 cfq-iosched: Impl... |
4610 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4611 |
ret = blkcg_policy_register(&blkcg_policy_cfq); |
8bd435b30 blkcg: remove sta... |
4612 4613 |
if (ret) return ret; |
ffea73fc7 block: blkcg_poli... |
4614 4615 4616 |
#else cfq_group_idle = 0; #endif |
8bd435b30 blkcg: remove sta... |
4617 |
|
fd7949564 block: fix return... |
4618 |
ret = -ENOMEM; |
3d3c2379f block, cfq: move ... |
4619 4620 |
cfq_pool = KMEM_CACHE(cfq_queue, 0); if (!cfq_pool) |
8bd435b30 blkcg: remove sta... |
4621 |
goto err_pol_unreg; |
1da177e4c Linux-2.6.12-rc2 |
4622 |
|
3d3c2379f block, cfq: move ... |
4623 |
ret = elv_register(&iosched_cfq); |
8bd435b30 blkcg: remove sta... |
4624 4625 |
if (ret) goto err_free_pool; |
3d3c2379f block, cfq: move ... |
4626 |
|
2fdd82bd8 block: let elv_re... |
4627 |
return 0; |
8bd435b30 blkcg: remove sta... |
4628 4629 4630 4631 |
err_free_pool: kmem_cache_destroy(cfq_pool); err_pol_unreg: |
ffea73fc7 block: blkcg_poli... |
4632 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4633 |
blkcg_policy_unregister(&blkcg_policy_cfq); |
ffea73fc7 block: blkcg_poli... |
4634 |
#endif |
8bd435b30 blkcg: remove sta... |
4635 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
4636 4637 4638 4639 |
} static void __exit cfq_exit(void) { |
ffea73fc7 block: blkcg_poli... |
4640 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
3c798398e blkcg: mass renam... |
4641 |
blkcg_policy_unregister(&blkcg_policy_cfq); |
ffea73fc7 block: blkcg_poli... |
4642 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
4643 |
elv_unregister(&iosched_cfq); |
3d3c2379f block, cfq: move ... |
4644 |
kmem_cache_destroy(cfq_pool); |
1da177e4c Linux-2.6.12-rc2 |
4645 4646 4647 4648 4649 4650 4651 4652 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |