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block/cfq-iosched.c
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/* |
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* CFQ, or complete fairness queueing, disk scheduler. * * Based on ideas from a previously unfinished io * scheduler (round robin per-process disk scheduling) and Andrea Arcangeli. * |
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/blkdev.h> #include <linux/elevator.h> |
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#include <linux/jiffies.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 "cfq.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 int cfq_fifo_expire[2] = { HZ / 4, HZ / 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 int cfq_slice_sync = HZ / 10; |
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static int cfq_slice_async = HZ / 25; |
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static const int cfq_slice_async_rq = 2; |
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static int cfq_slice_idle = HZ / 125; |
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static int cfq_group_idle = HZ / 125; |
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static const int cfq_target_latency = HZ * 3/10; /* 300 ms */ 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 (HZ / 5) |
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/* * below this threshold, we consider thinktime immediate */ #define CFQ_MIN_TT (2) |
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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) \ |
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((struct cfq_io_context *) (rq)->elevator_private[0]) #define RQ_CFQQ(rq) (struct cfq_queue *) ((rq)->elevator_private[1]) #define RQ_CFQG(rq) (struct cfq_group *) ((rq)->elevator_private[2]) |
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|
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static struct kmem_cache *cfq_pool; static struct kmem_cache *cfq_ioc_pool; |
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|
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static DEFINE_PER_CPU(unsigned long, cfq_ioc_count); |
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static struct completion *ioc_gone; |
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static DEFINE_SPINLOCK(ioc_gone_lock); |
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|
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static DEFINE_SPINLOCK(cic_index_lock); static DEFINE_IDA(cic_index_ida); |
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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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/* |
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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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unsigned total_weight; |
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u64 min_vdisktime; |
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}; |
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#define CFQ_RB_ROOT (struct cfq_rb_root) { .rb = RB_ROOT, .left = NULL, \ .count = 0, .min_vdisktime = 0, } |
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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 */ unsigned long rb_key; /* 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. */ unsigned long dispatch_start; |
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unsigned int allocated_slice; |
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unsigned int slice_dispatch; |
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/* time when first request from queue completed and slice started. */ unsigned long slice_start; |
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unsigned long slice_end; long slice_resid; |
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/* pending metadata requests */ int meta_pending; /* number of requests that are on the dispatch list or inside driver */ int dispatched; /* io prio of this group */ unsigned short ioprio, org_ioprio; unsigned short ioprio_class, org_ioprio_class; |
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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 */ enum wl_prio_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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/* This is per cgroup per device grouping structure */ struct cfq_group { |
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/* group service_tree member */ struct rb_node rb_node; /* group service_tree key */ u64 vdisktime; |
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unsigned int weight; |
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unsigned int new_weight; bool needs_update; |
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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 queus average. Useful for workload slice calc. We * 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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unsigned long saved_workload_slice; enum wl_type_t saved_workload; enum wl_prio_t saved_serving_prio; |
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struct blkio_group blkg; #ifdef CONFIG_CFQ_GROUP_IOSCHED struct hlist_node cfqd_node; |
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int ref; |
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#endif |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; |
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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_prio_t serving_prio; |
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enum wl_type_t serving_type; unsigned long 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 */ struct timer_list 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; struct cfq_io_context *active_cic; |
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|
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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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sector_t last_position; |
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/* * tunables, see top of file */ unsigned int cfq_quantum; |
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unsigned int cfq_fifo_expire[2]; |
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unsigned int cfq_back_penalty; unsigned int cfq_back_max; |
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unsigned int cfq_slice[2]; unsigned int cfq_slice_async_rq; unsigned int cfq_slice_idle; |
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unsigned int cfq_group_idle; |
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unsigned int cfq_latency; |
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|
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unsigned int cic_index; |
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struct list_head cic_list; |
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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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unsigned long last_delayed_sync; |
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/* List of cfq groups being managed on this device*/ struct hlist_head cfqg_list; |
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/* Number of groups which are on blkcg->blkg_list */ unsigned int nr_blkcg_linked_grps; |
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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 struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg, enum wl_prio_t prio, |
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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 (prio == IDLE_WORKLOAD) |
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return &cfqg->service_tree_idle; |
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|
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return &cfqg->service_trees[prio][type]; |
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} |
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enum cfqq_state_flags { |
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CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ |
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CFQ_CFQQ_FLAG_must_dispatch, /* must be allowed a dispatch */ |
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CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ |
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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 */ |
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CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
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CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
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CFQ_CFQQ_FLAG_coop, /* cfqq is shared */ |
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CFQ_CFQQ_FLAG_split_coop, /* shared cfqq will be splitted */ |
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CFQ_CFQQ_FLAG_deep, /* sync cfqq experienced large depth */ |
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CFQ_CFQQ_FLAG_wait_busy, /* Waiting for next request */ |
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}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
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(cfqq)->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ |
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} \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ |
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(cfqq)->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ |
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} \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ |
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return ((cfqq)->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ |
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} CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); |
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CFQ_CFQQ_FNS(must_dispatch); |
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CFQ_CFQQ_FNS(must_alloc_slice); |
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CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
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CFQ_CFQQ_FNS(slice_new); |
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CFQ_CFQQ_FNS(sync); |
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CFQ_CFQQ_FNS(coop); |
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CFQ_CFQQ_FNS(split_coop); |
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CFQ_CFQQ_FNS(deep); |
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CFQ_CFQQ_FNS(wait_busy); |
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#undef CFQ_CFQQ_FNS |
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#ifdef CONFIG_CFQ_GROUP_IOSCHED |
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#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \ blkg_path(&(cfqq)->cfqg->blkg), ##args); #define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "%s " fmt, \ blkg_path(&(cfqg)->blkg), ##args); \ #else |
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#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args) |
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#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0); #endif |
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#define cfq_log(cfqd, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) |
615f0259e blkio: Implement ... |
370 371 372 373 374 375 376 377 378 |
/* 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) \ |
02b35081f cfq-iosched: Do g... |
379 380 381 382 383 384 385 386 387 388 389 390 391 392 |
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; } |
c0324a020 cfq-iosched: reim... |
393 394 395 396 397 398 399 400 |
static inline enum wl_prio_t cfqq_prio(struct cfq_queue *cfqq) { if (cfq_class_idle(cfqq)) return IDLE_WORKLOAD; if (cfq_class_rt(cfqq)) return RT_WORKLOAD; return BE_WORKLOAD; } |
718eee057 cfq-iosched: fair... |
401 402 403 404 405 406 407 408 409 |
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; } |
58ff82f34 blkio: Implement ... |
410 411 412 |
static inline int cfq_group_busy_queues_wl(enum wl_prio_t wl, struct cfq_data *cfqd, struct cfq_group *cfqg) |
c0324a020 cfq-iosched: reim... |
413 414 |
{ if (wl == IDLE_WORKLOAD) |
cdb16e8f7 blkio: Introduce ... |
415 |
return cfqg->service_tree_idle.count; |
c0324a020 cfq-iosched: reim... |
416 |
|
cdb16e8f7 blkio: Introduce ... |
417 418 419 |
return cfqg->service_trees[wl][ASYNC_WORKLOAD].count + cfqg->service_trees[wl][SYNC_NOIDLE_WORKLOAD].count + cfqg->service_trees[wl][SYNC_WORKLOAD].count; |
c0324a020 cfq-iosched: reim... |
420 |
} |
f26bd1f0a blkio: Determine ... |
421 422 423 424 425 426 |
static inline int cfqg_busy_async_queues(struct cfq_data *cfqd, struct cfq_group *cfqg) { return cfqg->service_trees[RT_WORKLOAD][ASYNC_WORKLOAD].count + cfqg->service_trees[BE_WORKLOAD][ASYNC_WORKLOAD].count; } |
165125e1e [BLOCK] Get rid o... |
427 |
static void cfq_dispatch_insert(struct request_queue *, struct request *); |
a6151c3a5 cfq-iosched: appl... |
428 |
static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool, |
fd0928df9 ioprio: move io p... |
429 |
struct io_context *, gfp_t); |
4ac845a2e block: cfq: make ... |
430 |
static struct cfq_io_context *cfq_cic_lookup(struct cfq_data *, |
91fac317a cfq-iosched: get ... |
431 432 433 |
struct io_context *); static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_context *cic, |
a6151c3a5 cfq-iosched: appl... |
434 |
bool is_sync) |
91fac317a cfq-iosched: get ... |
435 |
{ |
a6151c3a5 cfq-iosched: appl... |
436 |
return cic->cfqq[is_sync]; |
91fac317a cfq-iosched: get ... |
437 438 439 |
} static inline void cic_set_cfqq(struct cfq_io_context *cic, |
a6151c3a5 cfq-iosched: appl... |
440 |
struct cfq_queue *cfqq, bool is_sync) |
91fac317a cfq-iosched: get ... |
441 |
{ |
a6151c3a5 cfq-iosched: appl... |
442 |
cic->cfqq[is_sync] = cfqq; |
91fac317a cfq-iosched: get ... |
443 |
} |
bca4b914b cfq-iosched: remo... |
444 |
#define CIC_DEAD_KEY 1ul |
80b15c738 cfq-iosched: comp... |
445 |
#define CIC_DEAD_INDEX_SHIFT 1 |
bca4b914b cfq-iosched: remo... |
446 447 448 |
static inline void *cfqd_dead_key(struct cfq_data *cfqd) { |
80b15c738 cfq-iosched: comp... |
449 |
return (void *)(cfqd->cic_index << CIC_DEAD_INDEX_SHIFT | CIC_DEAD_KEY); |
bca4b914b cfq-iosched: remo... |
450 451 452 453 454 455 456 457 458 459 460 |
} static inline struct cfq_data *cic_to_cfqd(struct cfq_io_context *cic) { struct cfq_data *cfqd = cic->key; if (unlikely((unsigned long) cfqd & CIC_DEAD_KEY)) return NULL; return cfqd; } |
91fac317a cfq-iosched: get ... |
461 462 463 464 |
/* * 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... |
465 |
static inline bool cfq_bio_sync(struct bio *bio) |
91fac317a cfq-iosched: get ... |
466 |
{ |
7b6d91dae block: unify flag... |
467 |
return bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC); |
91fac317a cfq-iosched: get ... |
468 |
} |
1da177e4c Linux-2.6.12-rc2 |
469 |
|
1da177e4c Linux-2.6.12-rc2 |
470 |
/* |
99f95e528 [PATCH] cfq build... |
471 472 473 |
* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ |
23e018a1b block: get rid of... |
474 |
static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) |
99f95e528 [PATCH] cfq build... |
475 |
{ |
7b679138b cfq-iosched: add ... |
476 477 |
if (cfqd->busy_queues) { cfq_log(cfqd, "schedule dispatch"); |
23e018a1b block: get rid of... |
478 |
kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work); |
7b679138b cfq-iosched: add ... |
479 |
} |
99f95e528 [PATCH] cfq build... |
480 |
} |
1da177e4c Linux-2.6.12-rc2 |
481 |
/* |
44f7c1606 cfq-iosched: defe... |
482 483 484 485 |
* 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. */ |
a6151c3a5 cfq-iosched: appl... |
486 |
static inline int cfq_prio_slice(struct cfq_data *cfqd, bool sync, |
d9e7620e6 cfq-iosched: rewo... |
487 |
unsigned short prio) |
44f7c1606 cfq-iosched: defe... |
488 |
{ |
d9e7620e6 cfq-iosched: rewo... |
489 |
const int base_slice = cfqd->cfq_slice[sync]; |
44f7c1606 cfq-iosched: defe... |
490 |
|
d9e7620e6 cfq-iosched: rewo... |
491 492 493 494 |
WARN_ON(prio >= IOPRIO_BE_NR); return base_slice + (base_slice/CFQ_SLICE_SCALE * (4 - prio)); } |
44f7c1606 cfq-iosched: defe... |
495 |
|
d9e7620e6 cfq-iosched: rewo... |
496 497 498 499 |
static inline int 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... |
500 |
} |
25bc6b077 blkio: Introduce ... |
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 |
static inline u64 cfq_scale_slice(unsigned long delta, struct cfq_group *cfqg) { u64 d = delta << CFQ_SERVICE_SHIFT; d = d * BLKIO_WEIGHT_DEFAULT; do_div(d, cfqg->weight); return d; } 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 ... |
530 |
struct cfq_group *cfqg; |
25bc6b077 blkio: Introduce ... |
531 532 |
if (st->left) { cfqg = rb_entry_cfqg(st->left); |
a60327107 cfq-iosched: Fix ... |
533 534 |
st->min_vdisktime = max_vdisktime(st->min_vdisktime, cfqg->vdisktime); |
25bc6b077 blkio: Introduce ... |
535 |
} |
25bc6b077 blkio: Introduce ... |
536 |
} |
5db5d6427 cfq-iosched: adap... |
537 538 539 540 541 |
/* * 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 ... |
542 543 |
static inline unsigned cfq_group_get_avg_queues(struct cfq_data *cfqd, struct cfq_group *cfqg, bool rt) |
5869619cb cfq-iosched: fix ... |
544 |
{ |
5db5d6427 cfq-iosched: adap... |
545 546 547 |
unsigned min_q, max_q; unsigned mult = cfq_hist_divisor - 1; unsigned round = cfq_hist_divisor / 2; |
58ff82f34 blkio: Implement ... |
548 |
unsigned busy = cfq_group_busy_queues_wl(rt, cfqd, cfqg); |
5db5d6427 cfq-iosched: adap... |
549 |
|
58ff82f34 blkio: Implement ... |
550 551 552 |
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... |
553 |
cfq_hist_divisor; |
58ff82f34 blkio: Implement ... |
554 555 556 557 558 559 560 561 562 |
return cfqg->busy_queues_avg[rt]; } static inline unsigned cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) { struct cfq_rb_root *st = &cfqd->grp_service_tree; return cfq_target_latency * cfqg->weight / st->total_weight; |
5db5d6427 cfq-iosched: adap... |
563 |
} |
c553f8e33 block cfq: compen... |
564 |
static inline unsigned |
ba5bd520f cfq: rename a fun... |
565 |
cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
566 |
{ |
5db5d6427 cfq-iosched: adap... |
567 568 |
unsigned slice = cfq_prio_to_slice(cfqd, cfqq); if (cfqd->cfq_latency) { |
58ff82f34 blkio: Implement ... |
569 570 571 572 573 574 |
/* * 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)); |
5db5d6427 cfq-iosched: adap... |
575 576 |
unsigned sync_slice = cfqd->cfq_slice[1]; unsigned expect_latency = sync_slice * iq; |
58ff82f34 blkio: Implement ... |
577 578 579 |
unsigned group_slice = cfq_group_slice(cfqd, cfqq->cfqg); if (expect_latency > group_slice) { |
5db5d6427 cfq-iosched: adap... |
580 581 582 583 584 585 586 |
unsigned base_low_slice = 2 * cfqd->cfq_slice_idle; /* scale low_slice according to IO priority * and sync vs async */ unsigned low_slice = min(slice, base_low_slice * slice / sync_slice); /* the adapted slice value is scaled to fit all iqs * into the target latency */ |
58ff82f34 blkio: Implement ... |
587 |
slice = max(slice * group_slice / expect_latency, |
5db5d6427 cfq-iosched: adap... |
588 589 590 |
low_slice); } } |
c553f8e33 block cfq: compen... |
591 592 593 594 595 596 |
return slice; } static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
ba5bd520f cfq: rename a fun... |
597 |
unsigned slice = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
598 |
|
dae739ebc blkio: Group time... |
599 |
cfqq->slice_start = jiffies; |
5db5d6427 cfq-iosched: adap... |
600 |
cfqq->slice_end = jiffies + slice; |
f75edf2dc blkio: Wait for c... |
601 |
cfqq->allocated_slice = slice; |
7b679138b cfq-iosched: add ... |
602 |
cfq_log_cfqq(cfqd, cfqq, "set_slice=%lu", cfqq->slice_end - jiffies); |
44f7c1606 cfq-iosched: defe... |
603 604 605 606 607 608 609 |
} /* * 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... |
610 |
static inline bool cfq_slice_used(struct cfq_queue *cfqq) |
44f7c1606 cfq-iosched: defe... |
611 612 |
{ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
613 |
return false; |
44f7c1606 cfq-iosched: defe... |
614 |
if (time_before(jiffies, cfqq->slice_end)) |
c1e44756f cfq-iosched: do c... |
615 |
return false; |
44f7c1606 cfq-iosched: defe... |
616 |
|
c1e44756f cfq-iosched: do c... |
617 |
return true; |
44f7c1606 cfq-iosched: defe... |
618 619 620 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
621 |
* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
1da177e4c Linux-2.6.12-rc2 |
622 |
* We choose the request that is closest to the head right now. Distance |
e8a99053e [PATCH] cfq-iosch... |
623 |
* behind the head is penalized and only allowed to a certain extent. |
1da177e4c Linux-2.6.12-rc2 |
624 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
625 |
static struct request * |
cf7c25cf9 cfq-iosched: fix ... |
626 |
cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, sector_t last) |
1da177e4c Linux-2.6.12-rc2 |
627 |
{ |
cf7c25cf9 cfq-iosched: fix ... |
628 |
sector_t s1, s2, d1 = 0, d2 = 0; |
1da177e4c Linux-2.6.12-rc2 |
629 |
unsigned long back_max; |
e8a99053e [PATCH] cfq-iosch... |
630 631 632 |
#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 |
633 |
|
5e7053747 [PATCH] cfq-iosch... |
634 635 636 637 |
if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
9c2c38a12 [PATCH] cfq-iosch... |
638 |
|
229836bd6 cfq-iosched: redu... |
639 640 641 642 643 |
if (rq_is_sync(rq1) != rq_is_sync(rq2)) return rq_is_sync(rq1) ? rq1 : rq2; if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_META) return rq1->cmd_flags & REQ_META ? rq1 : rq2; |
1da177e4c Linux-2.6.12-rc2 |
644 |
|
83096ebf1 block: convert to... |
645 646 |
s1 = blk_rq_pos(rq1); s2 = blk_rq_pos(rq2); |
1da177e4c Linux-2.6.12-rc2 |
647 |
|
1da177e4c Linux-2.6.12-rc2 |
648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 |
/* * 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... |
663 |
wrap |= CFQ_RQ1_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
664 665 666 667 668 669 |
if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
e8a99053e [PATCH] cfq-iosch... |
670 |
wrap |= CFQ_RQ2_WRAP; |
1da177e4c Linux-2.6.12-rc2 |
671 672 |
/* Found required data */ |
e8a99053e [PATCH] cfq-iosch... |
673 674 675 676 677 678 |
/* * 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... |
679 |
case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
680 |
if (d1 < d2) |
5e7053747 [PATCH] cfq-iosch... |
681 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
682 |
else if (d2 < d1) |
5e7053747 [PATCH] cfq-iosch... |
683 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
684 685 |
else { if (s1 >= s2) |
5e7053747 [PATCH] cfq-iosch... |
686 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
687 |
else |
5e7053747 [PATCH] cfq-iosch... |
688 |
return rq2; |
e8a99053e [PATCH] cfq-iosch... |
689 |
} |
1da177e4c Linux-2.6.12-rc2 |
690 |
|
e8a99053e [PATCH] cfq-iosch... |
691 |
case CFQ_RQ2_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
692 |
return rq1; |
e8a99053e [PATCH] cfq-iosch... |
693 |
case CFQ_RQ1_WRAP: |
5e7053747 [PATCH] cfq-iosch... |
694 695 |
return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
e8a99053e [PATCH] cfq-iosch... |
696 697 698 699 700 701 702 703 |
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... |
704 |
return rq1; |
1da177e4c Linux-2.6.12-rc2 |
705 |
else |
5e7053747 [PATCH] cfq-iosch... |
706 |
return rq2; |
1da177e4c Linux-2.6.12-rc2 |
707 708 |
} } |
498d3aa2b [PATCH] cfq-iosch... |
709 710 711 |
/* * The below is leftmost cache rbtree addon */ |
0871714e0 cfq-iosched: rela... |
712 |
static struct cfq_queue *cfq_rb_first(struct cfq_rb_root *root) |
cc09e2990 [PATCH] cfq-iosch... |
713 |
{ |
615f0259e blkio: Implement ... |
714 715 716 |
/* Service tree is empty */ if (!root->count) return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
717 718 |
if (!root->left) root->left = rb_first(&root->rb); |
0871714e0 cfq-iosched: rela... |
719 720 721 722 |
if (root->left) return rb_entry(root->left, struct cfq_queue, rb_node); return NULL; |
cc09e2990 [PATCH] cfq-iosch... |
723 |
} |
1fa8f6d68 blkio: Introduce ... |
724 725 726 727 728 729 730 731 732 733 |
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 ... |
734 735 736 737 738 |
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... |
739 740 741 742 |
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 ... |
743 |
rb_erase_init(n, &root->rb); |
aa6f6a3de cfq-iosched: prep... |
744 |
--root->count; |
cc09e2990 [PATCH] cfq-iosch... |
745 |
} |
1da177e4c Linux-2.6.12-rc2 |
746 747 748 |
/* * would be nice to take fifo expire time into account as well */ |
5e7053747 [PATCH] cfq-iosch... |
749 750 751 |
static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
1da177e4c Linux-2.6.12-rc2 |
752 |
{ |
21183b07e [PATCH] cfq-iosch... |
753 754 |
struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
5e7053747 [PATCH] cfq-iosch... |
755 |
struct request *next = NULL, *prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
756 |
|
21183b07e [PATCH] cfq-iosch... |
757 |
BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
1da177e4c Linux-2.6.12-rc2 |
758 759 |
if (rbprev) |
5e7053747 [PATCH] cfq-iosch... |
760 |
prev = rb_entry_rq(rbprev); |
1da177e4c Linux-2.6.12-rc2 |
761 |
|
21183b07e [PATCH] cfq-iosch... |
762 |
if (rbnext) |
5e7053747 [PATCH] cfq-iosch... |
763 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
764 765 766 |
else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
5e7053747 [PATCH] cfq-iosch... |
767 |
next = rb_entry_rq(rbnext); |
21183b07e [PATCH] cfq-iosch... |
768 |
} |
1da177e4c Linux-2.6.12-rc2 |
769 |
|
cf7c25cf9 cfq-iosched: fix ... |
770 |
return cfq_choose_req(cfqd, next, prev, blk_rq_pos(last)); |
1da177e4c Linux-2.6.12-rc2 |
771 |
} |
d9e7620e6 cfq-iosched: rewo... |
772 773 |
static unsigned long cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
774 |
{ |
d9e7620e6 cfq-iosched: rewo... |
775 776 777 |
/* * just an approximation, should be ok. */ |
cdb16e8f7 blkio: Introduce ... |
778 |
return (cfqq->cfqg->nr_cfqq - 1) * (cfq_prio_slice(cfqd, 1, 0) - |
464191c65 Revert "cfq: Make... |
779 |
cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
d9e7620e6 cfq-iosched: rewo... |
780 |
} |
1fa8f6d68 blkio: Introduce ... |
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 |
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); } static void |
8184f93ec cfq-iosched: Don'... |
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 |
cfq_update_group_weight(struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); if (cfqg->needs_update) { cfqg->weight = cfqg->new_weight; cfqg->needs_update = false; } } static void cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) { BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node)); cfq_update_group_weight(cfqg); __cfq_group_service_tree_add(st, cfqg); st->total_weight += cfqg->weight; } static void cfq_group_notify_queue_add(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
837 838 839 840 841 842 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; struct cfq_group *__cfqg; struct rb_node *n; cfqg->nr_cfqq++; |
760701bfe cfq-iosched: Get ... |
843 |
if (!RB_EMPTY_NODE(&cfqg->rb_node)) |
1fa8f6d68 blkio: Introduce ... |
844 845 846 847 848 |
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... |
849 |
* if group does not loose all if it was not continuously backlogged. |
1fa8f6d68 blkio: Introduce ... |
850 851 852 853 854 855 856 |
*/ 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'... |
857 858 |
cfq_group_service_tree_add(st, cfqg); } |
1fa8f6d68 blkio: Introduce ... |
859 |
|
8184f93ec cfq-iosched: Don'... |
860 861 862 863 864 865 |
static void cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) { st->total_weight -= cfqg->weight; if (!RB_EMPTY_NODE(&cfqg->rb_node)) cfq_rb_erase(&cfqg->rb_node, st); |
1fa8f6d68 blkio: Introduce ... |
866 867 868 |
} static void |
8184f93ec cfq-iosched: Don'... |
869 |
cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg) |
1fa8f6d68 blkio: Introduce ... |
870 871 872 873 874 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; BUG_ON(cfqg->nr_cfqq < 1); cfqg->nr_cfqq--; |
25bc6b077 blkio: Introduce ... |
875 |
|
1fa8f6d68 blkio: Introduce ... |
876 877 878 |
/* If there are other cfq queues under this group, don't delete it */ if (cfqg->nr_cfqq) return; |
2868ef7b3 blkio: Some debug... |
879 |
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group"); |
8184f93ec cfq-iosched: Don'... |
880 |
cfq_group_service_tree_del(st, cfqg); |
dae739ebc blkio: Group time... |
881 |
cfqg->saved_workload_slice = 0; |
e98ef89b3 cfq-iosched: Fixe... |
882 |
cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1); |
dae739ebc blkio: Group time... |
883 |
} |
167400d34 blk-cgroup: Add u... |
884 885 |
static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq, unsigned int *unaccounted_time) |
dae739ebc blkio: Group time... |
886 |
{ |
f75edf2dc blkio: Wait for c... |
887 |
unsigned int slice_used; |
dae739ebc blkio: Group time... |
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 |
/* * Queue got expired before even a single request completed or * got expired immediately after first request completion. */ if (!cfqq->slice_start || cfqq->slice_start == jiffies) { /* * 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. */ slice_used = max_t(unsigned, (jiffies - cfqq->dispatch_start), 1); } else { slice_used = jiffies - cfqq->slice_start; |
167400d34 blk-cgroup: Add u... |
904 905 |
if (slice_used > cfqq->allocated_slice) { *unaccounted_time = slice_used - cfqq->allocated_slice; |
f75edf2dc blkio: Wait for c... |
906 |
slice_used = cfqq->allocated_slice; |
167400d34 blk-cgroup: Add u... |
907 908 909 910 |
} if (time_after(cfqq->slice_start, cfqq->dispatch_start)) *unaccounted_time += cfqq->slice_start - cfqq->dispatch_start; |
dae739ebc blkio: Group time... |
911 |
} |
dae739ebc blkio: Group time... |
912 913 914 915 |
return slice_used; } static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, |
e5ff082e8 blkio: Fix anothe... |
916 |
struct cfq_queue *cfqq) |
dae739ebc blkio: Group time... |
917 918 |
{ struct cfq_rb_root *st = &cfqd->grp_service_tree; |
167400d34 blk-cgroup: Add u... |
919 |
unsigned int used_sl, charge, unaccounted_sl = 0; |
f26bd1f0a blkio: Determine ... |
920 921 922 923 |
int nr_sync = cfqg->nr_cfqq - cfqg_busy_async_queues(cfqd, cfqg) - cfqg->service_tree_idle.count; BUG_ON(nr_sync < 0); |
167400d34 blk-cgroup: Add u... |
924 |
used_sl = charge = cfq_cfqq_slice_usage(cfqq, &unaccounted_sl); |
dae739ebc blkio: Group time... |
925 |
|
02b35081f cfq-iosched: Do g... |
926 927 928 929 |
if (iops_mode(cfqd)) charge = cfqq->slice_dispatch; else if (!cfq_cfqq_sync(cfqq) && !nr_sync) charge = cfqq->allocated_slice; |
dae739ebc blkio: Group time... |
930 931 |
/* Can't update vdisktime while group is on service tree */ |
8184f93ec cfq-iosched: Don'... |
932 |
cfq_group_service_tree_del(st, cfqg); |
02b35081f cfq-iosched: Do g... |
933 |
cfqg->vdisktime += cfq_scale_slice(charge, cfqg); |
8184f93ec cfq-iosched: Don'... |
934 935 |
/* If a new weight was requested, update now, off tree */ cfq_group_service_tree_add(st, cfqg); |
dae739ebc blkio: Group time... |
936 937 938 939 940 941 942 943 944 |
/* This group is being expired. Save the context */ if (time_after(cfqd->workload_expires, jiffies)) { cfqg->saved_workload_slice = cfqd->workload_expires - jiffies; cfqg->saved_workload = cfqd->serving_type; cfqg->saved_serving_prio = cfqd->serving_prio; } else cfqg->saved_workload_slice = 0; |
2868ef7b3 blkio: Some debug... |
945 946 947 |
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, st->min_vdisktime); |
c4e7893eb cfq-iosched: blkt... |
948 949 950 |
cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u" " sect=%u", used_sl, cfqq->slice_dispatch, charge, iops_mode(cfqd), cfqq->nr_sectors); |
167400d34 blk-cgroup: Add u... |
951 952 |
cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl, unaccounted_sl); |
e98ef89b3 cfq-iosched: Fixe... |
953 |
cfq_blkiocg_set_start_empty_time(&cfqg->blkg); |
1fa8f6d68 blkio: Introduce ... |
954 |
} |
25fb5169d blkio: Dynamic cf... |
955 956 957 958 959 960 961 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg) { if (blkg) return container_of(blkg, struct cfq_group, blkg); return NULL; } |
fe0714377 blkio: Recalculat... |
962 963 |
void cfq_update_blkio_group_weight(void *key, struct blkio_group *blkg, unsigned int weight) |
f8d461d69 blkio: Propagate ... |
964 |
{ |
8184f93ec cfq-iosched: Don'... |
965 966 967 |
struct cfq_group *cfqg = cfqg_of_blkg(blkg); cfqg->new_weight = weight; cfqg->needs_update = true; |
f8d461d69 blkio: Propagate ... |
968 |
} |
f469a7b4d blk-cgroup: Allow... |
969 970 |
static void cfq_init_add_cfqg_lists(struct cfq_data *cfqd, struct cfq_group *cfqg, struct blkio_cgroup *blkcg) |
25fb5169d blkio: Dynamic cf... |
971 |
{ |
220841906 blkio: Export dis... |
972 973 |
struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; |
25fb5169d blkio: Dynamic cf... |
974 |
|
f469a7b4d blk-cgroup: Allow... |
975 976 977 978 979 980 981 |
/* * Add group onto cgroup list. It might happen that bdi->dev is * not initialized yet. Initialize this new group without major * and minor info and this info will be filled in once a new thread * comes for IO. */ if (bdi->dev) { |
a74b2adae block: expose the... |
982 |
sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); |
f469a7b4d blk-cgroup: Allow... |
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 |
cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, MKDEV(major, minor)); } else cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd, 0); cfqd->nr_blkcg_linked_grps++; cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev); /* Add group on cfqd list */ hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); } /* * Should be called from sleepable context. No request queue lock as per * cpu stats are allocated dynamically and alloc_percpu needs to be called * from sleepable context. */ static struct cfq_group * cfq_alloc_cfqg(struct cfq_data *cfqd) { struct cfq_group *cfqg = NULL; |
5624a4e44 blk-throttle: Mak... |
1004 |
int i, j, ret; |
f469a7b4d blk-cgroup: Allow... |
1005 |
struct cfq_rb_root *st; |
25fb5169d blkio: Dynamic cf... |
1006 1007 1008 |
cfqg = kzalloc_node(sizeof(*cfqg), GFP_ATOMIC, cfqd->queue->node); if (!cfqg) |
f469a7b4d blk-cgroup: Allow... |
1009 |
return NULL; |
25fb5169d blkio: Dynamic cf... |
1010 |
|
25fb5169d blkio: Dynamic cf... |
1011 1012 1013 |
for_each_cfqg_st(cfqg, i, j, st) *st = CFQ_RB_ROOT; RB_CLEAR_NODE(&cfqg->rb_node); |
b1c357696 blkio: Take care ... |
1014 1015 1016 1017 1018 1019 |
/* * Take the initial reference that will be released on destroy * This can be thought of a joint reference by cgroup and * elevator which will be dropped by either elevator exit * or cgroup deletion path depending on who is exiting first. */ |
329a67815 block cfq: don't ... |
1020 |
cfqg->ref = 1; |
5624a4e44 blk-throttle: Mak... |
1021 1022 1023 1024 1025 1026 |
ret = blkio_alloc_blkg_stats(&cfqg->blkg); if (ret) { kfree(cfqg); return NULL; } |
f469a7b4d blk-cgroup: Allow... |
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 |
return cfqg; } static struct cfq_group * cfq_find_cfqg(struct cfq_data *cfqd, struct blkio_cgroup *blkcg) { struct cfq_group *cfqg = NULL; void *key = cfqd; struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info; unsigned int major, minor; |
b1c357696 blkio: Take care ... |
1037 |
|
180be2a04 cfq-iosched: fix ... |
1038 |
/* |
f469a7b4d blk-cgroup: Allow... |
1039 1040 |
* This is the common case when there are no blkio cgroups. * Avoid lookup in this case |
180be2a04 cfq-iosched: fix ... |
1041 |
*/ |
f469a7b4d blk-cgroup: Allow... |
1042 1043 1044 1045 |
if (blkcg == &blkio_root_cgroup) cfqg = &cfqd->root_group; else cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); |
25fb5169d blkio: Dynamic cf... |
1046 |
|
f469a7b4d blk-cgroup: Allow... |
1047 1048 1049 1050 |
if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) { sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor); cfqg->blkg.dev = MKDEV(major, minor); } |
25fb5169d blkio: Dynamic cf... |
1051 |
|
25fb5169d blkio: Dynamic cf... |
1052 1053 1054 1055 |
return cfqg; } /* |
3e59cf9d6 cfq-iosched: Get ... |
1056 1057 |
* Search for the cfq group current task belongs to. request_queue lock must * be held. |
25fb5169d blkio: Dynamic cf... |
1058 |
*/ |
3e59cf9d6 cfq-iosched: Get ... |
1059 |
static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd) |
25fb5169d blkio: Dynamic cf... |
1060 |
{ |
70087dc38 blk-throttle: Use... |
1061 |
struct blkio_cgroup *blkcg; |
f469a7b4d blk-cgroup: Allow... |
1062 1063 |
struct cfq_group *cfqg = NULL, *__cfqg = NULL; struct request_queue *q = cfqd->queue; |
25fb5169d blkio: Dynamic cf... |
1064 1065 |
rcu_read_lock(); |
70087dc38 blk-throttle: Use... |
1066 |
blkcg = task_blkio_cgroup(current); |
f469a7b4d blk-cgroup: Allow... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 |
cfqg = cfq_find_cfqg(cfqd, blkcg); if (cfqg) { rcu_read_unlock(); return cfqg; } /* * Need to allocate a group. Allocation of group also needs allocation * of per cpu stats which in-turn takes a mutex() and can block. Hence * we need to drop rcu lock and queue_lock before we call alloc. * * Not taking any queue reference here and assuming that queue is * around by the time we return. CFQ queue allocation code does * the same. It might be racy though. */ rcu_read_unlock(); spin_unlock_irq(q->queue_lock); cfqg = cfq_alloc_cfqg(cfqd); spin_lock_irq(q->queue_lock); rcu_read_lock(); blkcg = task_blkio_cgroup(current); /* * If some other thread already allocated the group while we were * not holding queue lock, free up the group */ __cfqg = cfq_find_cfqg(cfqd, blkcg); if (__cfqg) { kfree(cfqg); rcu_read_unlock(); return __cfqg; } |
3e59cf9d6 cfq-iosched: Get ... |
1104 |
if (!cfqg) |
25fb5169d blkio: Dynamic cf... |
1105 |
cfqg = &cfqd->root_group; |
f469a7b4d blk-cgroup: Allow... |
1106 1107 |
cfq_init_add_cfqg_lists(cfqd, cfqg, blkcg); |
25fb5169d blkio: Dynamic cf... |
1108 1109 1110 |
rcu_read_unlock(); return cfqg; } |
7f1dc8a2d blkio: Fix blkio ... |
1111 1112 |
static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg) { |
329a67815 block cfq: don't ... |
1113 |
cfqg->ref++; |
7f1dc8a2d blkio: Fix blkio ... |
1114 1115 |
return cfqg; } |
25fb5169d blkio: Dynamic cf... |
1116 1117 1118 1119 1120 1121 1122 |
static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { /* Currently, all async queues are mapped to root group */ if (!cfq_cfqq_sync(cfqq)) cfqg = &cfqq->cfqd->root_group; cfqq->cfqg = cfqg; |
b1c357696 blkio: Take care ... |
1123 |
/* cfqq reference on cfqg */ |
329a67815 block cfq: don't ... |
1124 |
cfqq->cfqg->ref++; |
b1c357696 blkio: Take care ... |
1125 1126 1127 1128 1129 1130 |
} static void cfq_put_cfqg(struct cfq_group *cfqg) { struct cfq_rb_root *st; int i, j; |
329a67815 block cfq: don't ... |
1131 1132 1133 |
BUG_ON(cfqg->ref <= 0); cfqg->ref--; if (cfqg->ref) |
b1c357696 blkio: Take care ... |
1134 1135 |
return; for_each_cfqg_st(cfqg, i, j, st) |
b54ce60eb cfq-iosched: Get ... |
1136 |
BUG_ON(!RB_EMPTY_ROOT(&st->rb)); |
5624a4e44 blk-throttle: Mak... |
1137 |
free_percpu(cfqg->blkg.stats_cpu); |
b1c357696 blkio: Take care ... |
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 |
kfree(cfqg); } static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg) { /* Something wrong if we are trying to remove same group twice */ BUG_ON(hlist_unhashed(&cfqg->cfqd_node)); hlist_del_init(&cfqg->cfqd_node); /* * Put the reference taken at the time of creation so that when all * queues are gone, group can be destroyed. */ cfq_put_cfqg(cfqg); } static void cfq_release_cfq_groups(struct cfq_data *cfqd) { struct hlist_node *pos, *n; struct cfq_group *cfqg; hlist_for_each_entry_safe(cfqg, pos, n, &cfqd->cfqg_list, cfqd_node) { /* * If cgroup removal path got to blk_group first and removed * it from cgroup list, then it will take care of destroying * cfqg also. */ |
e98ef89b3 cfq-iosched: Fixe... |
1166 |
if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg)) |
b1c357696 blkio: Take care ... |
1167 1168 |
cfq_destroy_cfqg(cfqd, cfqg); } |
25fb5169d blkio: Dynamic cf... |
1169 |
} |
b1c357696 blkio: Take care ... |
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 |
/* * Blk cgroup controller notification saying that blkio_group object is being * delinked as associated cgroup object is going away. That also means that * no new IO will come in this group. So get rid of this group as soon as * any pending IO in the group is finished. * * This function is called under rcu_read_lock(). key is the rcu protected * pointer. That means "key" is a valid cfq_data pointer as long as we are rcu * read lock. * * "key" was fetched from blkio_group under blkio_cgroup->lock. That means * it should not be NULL as even if elevator was exiting, cgroup deltion * path got to it first. */ void cfq_unlink_blkio_group(void *key, struct blkio_group *blkg) { unsigned long flags; struct cfq_data *cfqd = key; spin_lock_irqsave(cfqd->queue->queue_lock, flags); cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg)); spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
25fb5169d blkio: Dynamic cf... |
1194 |
#else /* GROUP_IOSCHED */ |
3e59cf9d6 cfq-iosched: Get ... |
1195 |
static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd) |
25fb5169d blkio: Dynamic cf... |
1196 1197 1198 |
{ return &cfqd->root_group; } |
7f1dc8a2d blkio: Fix blkio ... |
1199 1200 1201 |
static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg) { |
50eaeb323 cfq-iosched: fix ... |
1202 |
return cfqg; |
7f1dc8a2d blkio: Fix blkio ... |
1203 |
} |
25fb5169d blkio: Dynamic cf... |
1204 1205 1206 1207 |
static inline void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { cfqq->cfqg = cfqg; } |
b1c357696 blkio: Take care ... |
1208 1209 |
static void cfq_release_cfq_groups(struct cfq_data *cfqd) {} static inline void cfq_put_cfqg(struct cfq_group *cfqg) {} |
25fb5169d blkio: Dynamic cf... |
1210 |
#endif /* GROUP_IOSCHED */ |
498d3aa2b [PATCH] cfq-iosch... |
1211 |
/* |
c0324a020 cfq-iosched: reim... |
1212 |
* The cfqd->service_trees holds all pending cfq_queue's that have |
498d3aa2b [PATCH] cfq-iosch... |
1213 1214 1215 |
* requests waiting to be processed. It is sorted in the order that * we will service the queues. */ |
a36e71f99 cfq-iosched: add ... |
1216 |
static void cfq_service_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
1217 |
bool add_front) |
d9e7620e6 cfq-iosched: rewo... |
1218 |
{ |
0871714e0 cfq-iosched: rela... |
1219 1220 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
d9e7620e6 cfq-iosched: rewo... |
1221 |
unsigned long rb_key; |
c0324a020 cfq-iosched: reim... |
1222 |
struct cfq_rb_root *service_tree; |
498d3aa2b [PATCH] cfq-iosch... |
1223 |
int left; |
dae739ebc blkio: Group time... |
1224 |
int new_cfqq = 1; |
ae30c2865 blkio: Implement ... |
1225 |
|
cdb16e8f7 blkio: Introduce ... |
1226 |
service_tree = service_tree_for(cfqq->cfqg, cfqq_prio(cfqq), |
65b32a573 cfq-iosched: Remo... |
1227 |
cfqq_type(cfqq)); |
0871714e0 cfq-iosched: rela... |
1228 1229 |
if (cfq_class_idle(cfqq)) { rb_key = CFQ_IDLE_DELAY; |
aa6f6a3de cfq-iosched: prep... |
1230 |
parent = rb_last(&service_tree->rb); |
0871714e0 cfq-iosched: rela... |
1231 1232 1233 1234 1235 1236 |
if (parent && parent != &cfqq->rb_node) { __cfqq = rb_entry(parent, struct cfq_queue, rb_node); rb_key += __cfqq->rb_key; } else rb_key += jiffies; } else if (!add_front) { |
b9c8946b1 cfq-iosched: fix ... |
1237 1238 1239 1240 1241 1242 |
/* * 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. */ |
edd75ffd9 cfq-iosched: get ... |
1243 |
rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies; |
b9c8946b1 cfq-iosched: fix ... |
1244 |
rb_key -= cfqq->slice_resid; |
edd75ffd9 cfq-iosched: get ... |
1245 |
cfqq->slice_resid = 0; |
48e025e63 cfq-iosched: fix ... |
1246 1247 |
} else { rb_key = -HZ; |
aa6f6a3de cfq-iosched: prep... |
1248 |
__cfqq = cfq_rb_first(service_tree); |
48e025e63 cfq-iosched: fix ... |
1249 1250 |
rb_key += __cfqq ? __cfqq->rb_key : jiffies; } |
1da177e4c Linux-2.6.12-rc2 |
1251 |
|
d9e7620e6 cfq-iosched: rewo... |
1252 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
dae739ebc blkio: Group time... |
1253 |
new_cfqq = 0; |
99f9628ab [PATCH] cfq-iosch... |
1254 |
/* |
d9e7620e6 cfq-iosched: rewo... |
1255 |
* same position, nothing more to do |
99f9628ab [PATCH] cfq-iosch... |
1256 |
*/ |
c0324a020 cfq-iosched: reim... |
1257 1258 |
if (rb_key == cfqq->rb_key && cfqq->service_tree == service_tree) |
d9e7620e6 cfq-iosched: rewo... |
1259 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1260 |
|
aa6f6a3de cfq-iosched: prep... |
1261 1262 |
cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1263 |
} |
d9e7620e6 cfq-iosched: rewo... |
1264 |
|
498d3aa2b [PATCH] cfq-iosch... |
1265 |
left = 1; |
0871714e0 cfq-iosched: rela... |
1266 |
parent = NULL; |
aa6f6a3de cfq-iosched: prep... |
1267 1268 |
cfqq->service_tree = service_tree; p = &service_tree->rb.rb_node; |
d9e7620e6 cfq-iosched: rewo... |
1269 |
while (*p) { |
67060e379 cfq-iosched: sort... |
1270 |
struct rb_node **n; |
cc09e2990 [PATCH] cfq-iosch... |
1271 |
|
d9e7620e6 cfq-iosched: rewo... |
1272 1273 |
parent = *p; __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
0c534e0a4 cfq-iosched: sort... |
1274 |
/* |
c0324a020 cfq-iosched: reim... |
1275 |
* sort by key, that represents service time. |
0c534e0a4 cfq-iosched: sort... |
1276 |
*/ |
c0324a020 cfq-iosched: reim... |
1277 |
if (time_before(rb_key, __cfqq->rb_key)) |
67060e379 cfq-iosched: sort... |
1278 |
n = &(*p)->rb_left; |
c0324a020 cfq-iosched: reim... |
1279 |
else { |
67060e379 cfq-iosched: sort... |
1280 |
n = &(*p)->rb_right; |
cc09e2990 [PATCH] cfq-iosch... |
1281 |
left = 0; |
c0324a020 cfq-iosched: reim... |
1282 |
} |
67060e379 cfq-iosched: sort... |
1283 1284 |
p = n; |
d9e7620e6 cfq-iosched: rewo... |
1285 |
} |
cc09e2990 [PATCH] cfq-iosch... |
1286 |
if (left) |
aa6f6a3de cfq-iosched: prep... |
1287 |
service_tree->left = &cfqq->rb_node; |
cc09e2990 [PATCH] cfq-iosch... |
1288 |
|
d9e7620e6 cfq-iosched: rewo... |
1289 1290 |
cfqq->rb_key = rb_key; rb_link_node(&cfqq->rb_node, parent, p); |
aa6f6a3de cfq-iosched: prep... |
1291 1292 |
rb_insert_color(&cfqq->rb_node, &service_tree->rb); service_tree->count++; |
20359f27e cfq-iosched: remo... |
1293 |
if (add_front || !new_cfqq) |
dae739ebc blkio: Group time... |
1294 |
return; |
8184f93ec cfq-iosched: Don'... |
1295 |
cfq_group_notify_queue_add(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
1296 |
} |
a36e71f99 cfq-iosched: add ... |
1297 |
static struct cfq_queue * |
f2d1f0ae7 cfq-iosched: cach... |
1298 1299 1300 |
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 ... |
1301 |
{ |
a36e71f99 cfq-iosched: add ... |
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 |
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... |
1317 |
if (sector > blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1318 |
n = &(*p)->rb_right; |
2e46e8b27 block: drop reque... |
1319 |
else if (sector < blk_rq_pos(cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1320 1321 1322 1323 |
n = &(*p)->rb_left; else break; p = n; |
3ac6c9f8a cfq-iosched: fix ... |
1324 |
cfqq = NULL; |
a36e71f99 cfq-iosched: add ... |
1325 1326 1327 1328 1329 |
} *ret_parent = parent; if (rb_link) *rb_link = p; |
3ac6c9f8a cfq-iosched: fix ... |
1330 |
return cfqq; |
a36e71f99 cfq-iosched: add ... |
1331 1332 1333 1334 |
} static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
a36e71f99 cfq-iosched: add ... |
1335 1336 |
struct rb_node **p, *parent; struct cfq_queue *__cfqq; |
f2d1f0ae7 cfq-iosched: cach... |
1337 1338 1339 1340 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
a36e71f99 cfq-iosched: add ... |
1341 1342 1343 1344 1345 |
if (cfq_class_idle(cfqq)) return; if (!cfqq->next_rq) return; |
f2d1f0ae7 cfq-iosched: cach... |
1346 |
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio]; |
2e46e8b27 block: drop reque... |
1347 1348 |
__cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, blk_rq_pos(cfqq->next_rq), &parent, &p); |
3ac6c9f8a cfq-iosched: fix ... |
1349 1350 |
if (!__cfqq) { rb_link_node(&cfqq->p_node, parent, p); |
f2d1f0ae7 cfq-iosched: cach... |
1351 1352 1353 |
rb_insert_color(&cfqq->p_node, cfqq->p_root); } else cfqq->p_root = NULL; |
a36e71f99 cfq-iosched: add ... |
1354 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1355 1356 1357 |
/* * Update cfqq's position in the service tree. */ |
edd75ffd9 cfq-iosched: get ... |
1358 |
static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
1359 |
{ |
6d048f531 cfq-iosched: deve... |
1360 1361 1362 |
/* * Resorting requires the cfqq to be on the RR list already. */ |
a36e71f99 cfq-iosched: add ... |
1363 |
if (cfq_cfqq_on_rr(cfqq)) { |
edd75ffd9 cfq-iosched: get ... |
1364 |
cfq_service_tree_add(cfqd, cfqq, 0); |
a36e71f99 cfq-iosched: add ... |
1365 1366 |
cfq_prio_tree_add(cfqd, cfqq); } |
6d048f531 cfq-iosched: deve... |
1367 |
} |
1da177e4c Linux-2.6.12-rc2 |
1368 1369 |
/* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
1370 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
1371 |
*/ |
febffd618 cfq-iosched: kill... |
1372 |
static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1373 |
{ |
7b679138b cfq-iosched: add ... |
1374 |
cfq_log_cfqq(cfqd, cfqq, "add_to_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
1375 1376 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1377 |
cfqd->busy_queues++; |
ef8a41df8 cfq-iosched: give... |
1378 1379 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues++; |
1da177e4c Linux-2.6.12-rc2 |
1380 |
|
edd75ffd9 cfq-iosched: get ... |
1381 |
cfq_resort_rr_list(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1382 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1383 1384 1385 1386 |
/* * Called when the cfqq no longer has requests pending, remove it from * the service tree. */ |
febffd618 cfq-iosched: kill... |
1387 |
static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1388 |
{ |
7b679138b cfq-iosched: add ... |
1389 |
cfq_log_cfqq(cfqd, cfqq, "del_from_rr"); |
3b18152c3 [PATCH] CFQ io sc... |
1390 1391 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1392 |
|
aa6f6a3de cfq-iosched: prep... |
1393 1394 1395 1396 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { cfq_rb_erase(&cfqq->rb_node, cfqq->service_tree); cfqq->service_tree = NULL; } |
f2d1f0ae7 cfq-iosched: cach... |
1397 1398 1399 1400 |
if (cfqq->p_root) { rb_erase(&cfqq->p_node, cfqq->p_root); cfqq->p_root = NULL; } |
d9e7620e6 cfq-iosched: rewo... |
1401 |
|
8184f93ec cfq-iosched: Don'... |
1402 |
cfq_group_notify_queue_del(cfqd, cfqq->cfqg); |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; |
ef8a41df8 cfq-iosched: give... |
1405 1406 |
if (cfq_cfqq_sync(cfqq)) cfqd->busy_sync_queues--; |
1da177e4c Linux-2.6.12-rc2 |
1407 1408 1409 1410 1411 |
} /* * rb tree support functions */ |
febffd618 cfq-iosched: kill... |
1412 |
static void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1413 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1414 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
5e7053747 [PATCH] cfq-iosch... |
1415 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
1416 |
|
b4878f245 [PATCH] 02/05: up... |
1417 1418 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
1419 |
|
5e7053747 [PATCH] cfq-iosch... |
1420 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
1421 |
|
f04a64246 blkio: Keep queue... |
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
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 |
1433 |
} |
5e7053747 [PATCH] cfq-iosch... |
1434 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1435 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1436 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
1437 |
struct cfq_data *cfqd = cfqq->cfqd; |
a36e71f99 cfq-iosched: add ... |
1438 |
struct request *__alias, *prev; |
1da177e4c Linux-2.6.12-rc2 |
1439 |
|
5380a101d [PATCH] cfq-iosch... |
1440 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
1441 1442 1443 1444 1445 |
/* * looks a little odd, but the first insert might return an alias. * if that happens, put the alias on the dispatch list */ |
21183b07e [PATCH] cfq-iosch... |
1446 |
while ((__alias = elv_rb_add(&cfqq->sort_list, rq)) != NULL) |
5e7053747 [PATCH] cfq-iosch... |
1447 |
cfq_dispatch_insert(cfqd->queue, __alias); |
5fccbf61b [PATCH] CFQ: requ... |
1448 1449 1450 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
1451 1452 1453 1454 |
/* * check if this request is a better next-serve candidate */ |
a36e71f99 cfq-iosched: add ... |
1455 |
prev = cfqq->next_rq; |
cf7c25cf9 cfq-iosched: fix ... |
1456 |
cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq, cfqd->last_position); |
a36e71f99 cfq-iosched: add ... |
1457 1458 1459 1460 1461 1462 |
/* * adjust priority tree position, if ->next_rq changes */ if (prev != cfqq->next_rq) cfq_prio_tree_add(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
1463 |
BUG_ON(!cfqq->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
1464 |
} |
febffd618 cfq-iosched: kill... |
1465 |
static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1466 |
{ |
5380a101d [PATCH] cfq-iosch... |
1467 1468 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
e98ef89b3 cfq-iosched: Fixe... |
1469 1470 |
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
5e7053747 [PATCH] cfq-iosch... |
1471 |
cfq_add_rq_rb(rq); |
e98ef89b3 cfq-iosched: Fixe... |
1472 |
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg, |
7f1dc8a2d blkio: Fix blkio ... |
1473 1474 |
&cfqq->cfqd->serving_group->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1475 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
1476 1477 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1478 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
1479 |
struct task_struct *tsk = current; |
91fac317a cfq-iosched: get ... |
1480 |
struct cfq_io_context *cic; |
206dc69b3 [BLOCK] cfq-iosch... |
1481 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1482 |
|
4ac845a2e block: cfq: make ... |
1483 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
1484 1485 1486 1487 |
if (!cic) return NULL; cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
89850f7ee [PATCH] cfq-iosch... |
1488 1489 |
if (cfqq) { sector_t sector = bio->bi_sector + bio_sectors(bio); |
21183b07e [PATCH] cfq-iosch... |
1490 |
return elv_rb_find(&cfqq->sort_list, sector); |
89850f7ee [PATCH] cfq-iosch... |
1491 |
} |
1da177e4c Linux-2.6.12-rc2 |
1492 |
|
1da177e4c Linux-2.6.12-rc2 |
1493 1494 |
return NULL; } |
165125e1e [BLOCK] Get rid o... |
1495 |
static void cfq_activate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1496 |
{ |
22e2c507c [PATCH] Update cf... |
1497 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
1498 |
|
53c583d22 cfq-iosched: requ... |
1499 |
cfqd->rq_in_driver++; |
7b679138b cfq-iosched: add ... |
1500 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
1501 |
cfqd->rq_in_driver); |
25776e359 [PATCH] cfq-iosch... |
1502 |
|
5b93629b4 block: implement ... |
1503 |
cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq); |
1da177e4c Linux-2.6.12-rc2 |
1504 |
} |
165125e1e [BLOCK] Get rid o... |
1505 |
static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1506 |
{ |
b4878f245 [PATCH] 02/05: up... |
1507 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
53c583d22 cfq-iosched: requ... |
1508 1509 |
WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
7b679138b cfq-iosched: add ... |
1510 |
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d", |
53c583d22 cfq-iosched: requ... |
1511 |
cfqd->rq_in_driver); |
1da177e4c Linux-2.6.12-rc2 |
1512 |
} |
b4878f245 [PATCH] 02/05: up... |
1513 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1514 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1515 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
1516 |
|
5e7053747 [PATCH] cfq-iosch... |
1517 1518 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
1519 |
|
b4878f245 [PATCH] 02/05: up... |
1520 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
1521 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
1522 |
|
45333d5a3 cfq-iosched: fix ... |
1523 |
cfqq->cfqd->rq_queued--; |
e98ef89b3 cfq-iosched: Fixe... |
1524 1525 |
cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
7b6d91dae block: unify flag... |
1526 |
if (rq->cmd_flags & REQ_META) { |
374f84ac3 [PATCH] cfq-iosch... |
1527 1528 1529 |
WARN_ON(!cfqq->meta_pending); cfqq->meta_pending--; } |
1da177e4c Linux-2.6.12-rc2 |
1530 |
} |
165125e1e [BLOCK] Get rid o... |
1531 1532 |
static int cfq_merge(struct request_queue *q, struct request **req, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1533 1534 1535 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
1536 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1537 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
22e2c507c [PATCH] Update cf... |
1538 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
1539 1540 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
1541 1542 1543 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
1544 |
} |
165125e1e [BLOCK] Get rid o... |
1545 |
static void cfq_merged_request(struct request_queue *q, struct request *req, |
21183b07e [PATCH] cfq-iosch... |
1546 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
1547 |
{ |
21183b07e [PATCH] cfq-iosch... |
1548 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
1549 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
1550 |
|
5e7053747 [PATCH] cfq-iosch... |
1551 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
1552 |
} |
1da177e4c Linux-2.6.12-rc2 |
1553 |
} |
812d40264 blkio: Add io_mer... |
1554 1555 1556 |
static void cfq_bio_merged(struct request_queue *q, struct request *req, struct bio *bio) { |
e98ef89b3 cfq-iosched: Fixe... |
1557 1558 |
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg, bio_data_dir(bio), cfq_bio_sync(bio)); |
812d40264 blkio: Add io_mer... |
1559 |
} |
1da177e4c Linux-2.6.12-rc2 |
1560 |
static void |
165125e1e [BLOCK] Get rid o... |
1561 |
cfq_merged_requests(struct request_queue *q, struct request *rq, |
1da177e4c Linux-2.6.12-rc2 |
1562 1563 |
struct request *next) { |
cf7c25cf9 cfq-iosched: fix ... |
1564 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
1565 1566 1567 1568 |
/* * reposition in fifo if next is older than rq */ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && |
30996f40b cfq-iosched: fix ... |
1569 |
time_before(rq_fifo_time(next), rq_fifo_time(rq))) { |
22e2c507c [PATCH] Update cf... |
1570 |
list_move(&rq->queuelist, &next->queuelist); |
30996f40b cfq-iosched: fix ... |
1571 1572 |
rq_set_fifo_time(rq, rq_fifo_time(next)); } |
22e2c507c [PATCH] Update cf... |
1573 |
|
cf7c25cf9 cfq-iosched: fix ... |
1574 1575 |
if (cfqq->next_rq == next) cfqq->next_rq = rq; |
b4878f245 [PATCH] 02/05: up... |
1576 |
cfq_remove_request(next); |
e98ef89b3 cfq-iosched: Fixe... |
1577 1578 |
cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(next), rq_is_sync(next)); |
22e2c507c [PATCH] Update cf... |
1579 |
} |
165125e1e [BLOCK] Get rid o... |
1580 |
static int cfq_allow_merge(struct request_queue *q, struct request *rq, |
da7752650 [PATCH] cfq-iosch... |
1581 1582 1583 |
struct bio *bio) { struct cfq_data *cfqd = q->elevator->elevator_data; |
91fac317a cfq-iosched: get ... |
1584 |
struct cfq_io_context *cic; |
da7752650 [PATCH] cfq-iosch... |
1585 |
struct cfq_queue *cfqq; |
da7752650 [PATCH] cfq-iosch... |
1586 1587 |
/* |
ec8acb690 [PATCH] cfq-iosch... |
1588 |
* Disallow merge of a sync bio into an async request. |
da7752650 [PATCH] cfq-iosch... |
1589 |
*/ |
91fac317a cfq-iosched: get ... |
1590 |
if (cfq_bio_sync(bio) && !rq_is_sync(rq)) |
a6151c3a5 cfq-iosched: appl... |
1591 |
return false; |
da7752650 [PATCH] cfq-iosch... |
1592 1593 |
/* |
719d34027 [PATCH] cfq-iosch... |
1594 1595 |
* Lookup the cfqq that this bio will be queued with. Allow * merge only if rq is queued there. |
da7752650 [PATCH] cfq-iosch... |
1596 |
*/ |
4ac845a2e block: cfq: make ... |
1597 |
cic = cfq_cic_lookup(cfqd, current->io_context); |
91fac317a cfq-iosched: get ... |
1598 |
if (!cic) |
a6151c3a5 cfq-iosched: appl... |
1599 |
return false; |
719d34027 [PATCH] cfq-iosch... |
1600 |
|
91fac317a cfq-iosched: get ... |
1601 |
cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
a6151c3a5 cfq-iosched: appl... |
1602 |
return cfqq == RQ_CFQQ(rq); |
da7752650 [PATCH] cfq-iosch... |
1603 |
} |
812df48d1 blkio: Add more d... |
1604 1605 1606 |
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { del_timer(&cfqd->idle_slice_timer); |
e98ef89b3 cfq-iosched: Fixe... |
1607 |
cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg); |
812df48d1 blkio: Add more d... |
1608 |
} |
febffd618 cfq-iosched: kill... |
1609 1610 |
static void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
1611 1612 |
{ if (cfqq) { |
b1ffe737f cfq-iosched: Add ... |
1613 1614 |
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d", cfqd->serving_prio, cfqd->serving_type); |
62a37f6ba cfq-iosched: Don'... |
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 |
cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg); cfqq->slice_start = 0; cfqq->dispatch_start = jiffies; 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... |
1630 1631 1632 1633 1634 1635 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
1636 1637 1638 1639 |
* 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... |
1640 |
bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
1641 |
{ |
7b679138b cfq-iosched: add ... |
1642 |
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
1643 |
if (cfq_cfqq_wait_request(cfqq)) |
812df48d1 blkio: Add more d... |
1644 |
cfq_del_timer(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1645 |
|
7b14e3b52 [PATCH] cfq-iosch... |
1646 |
cfq_clear_cfqq_wait_request(cfqq); |
f75edf2dc blkio: Wait for c... |
1647 |
cfq_clear_cfqq_wait_busy(cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1648 1649 |
/* |
ae54abed6 cfq-iosched: spli... |
1650 1651 1652 1653 1654 1655 1656 1657 1658 |
* 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'... |
1659 |
* store what was left of this slice, if the queue idled/timed out |
7b14e3b52 [PATCH] cfq-iosch... |
1660 |
*/ |
c553f8e33 block cfq: compen... |
1661 1662 |
if (timed_out) { if (cfq_cfqq_slice_new(cfqq)) |
ba5bd520f cfq: rename a fun... |
1663 |
cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); |
c553f8e33 block cfq: compen... |
1664 1665 |
else cfqq->slice_resid = cfqq->slice_end - jiffies; |
7b679138b cfq-iosched: add ... |
1666 1667 |
cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid); } |
7b14e3b52 [PATCH] cfq-iosch... |
1668 |
|
e5ff082e8 blkio: Fix anothe... |
1669 |
cfq_group_served(cfqd, cfqq->cfqg, cfqq); |
dae739ebc blkio: Group time... |
1670 |
|
f04a64246 blkio: Keep queue... |
1671 1672 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) cfq_del_cfqq_rr(cfqd, cfqq); |
edd75ffd9 cfq-iosched: get ... |
1673 |
cfq_resort_rr_list(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
1674 1675 1676 1677 1678 1679 1680 1681 |
if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { put_io_context(cfqd->active_cic->ioc); cfqd->active_cic = NULL; } |
7b14e3b52 [PATCH] cfq-iosch... |
1682 |
} |
e5ff082e8 blkio: Fix anothe... |
1683 |
static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
1684 1685 1686 1687 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) |
e5ff082e8 blkio: Fix anothe... |
1688 |
__cfq_slice_expired(cfqd, cfqq, timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
1689 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1690 1691 1692 1693 |
/* * 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... |
1694 |
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
1695 |
{ |
c0324a020 cfq-iosched: reim... |
1696 |
struct cfq_rb_root *service_tree = |
cdb16e8f7 blkio: Introduce ... |
1697 |
service_tree_for(cfqd->serving_group, cfqd->serving_prio, |
65b32a573 cfq-iosched: Remo... |
1698 |
cfqd->serving_type); |
d9e7620e6 cfq-iosched: rewo... |
1699 |
|
f04a64246 blkio: Keep queue... |
1700 1701 |
if (!cfqd->rq_queued) return NULL; |
1fa8f6d68 blkio: Introduce ... |
1702 1703 1704 |
/* There is nothing to dispatch */ if (!service_tree) return NULL; |
c0324a020 cfq-iosched: reim... |
1705 1706 1707 |
if (RB_EMPTY_ROOT(&service_tree->rb)) return NULL; return cfq_rb_first(service_tree); |
6d048f531 cfq-iosched: deve... |
1708 |
} |
f04a64246 blkio: Keep queue... |
1709 1710 |
static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) { |
25fb5169d blkio: Dynamic cf... |
1711 |
struct cfq_group *cfqg; |
f04a64246 blkio: Keep queue... |
1712 1713 1714 1715 1716 1717 |
struct cfq_queue *cfqq; int i, j; struct cfq_rb_root *st; if (!cfqd->rq_queued) return NULL; |
25fb5169d blkio: Dynamic cf... |
1718 1719 1720 |
cfqg = cfq_get_next_cfqg(cfqd); if (!cfqg) return NULL; |
f04a64246 blkio: Keep queue... |
1721 1722 1723 1724 1725 |
for_each_cfqg_st(cfqg, i, j, st) if ((cfqq = cfq_rb_first(st)) != NULL) return cfqq; return NULL; } |
498d3aa2b [PATCH] cfq-iosch... |
1726 1727 1728 |
/* * Get and set a new active queue for service. */ |
a36e71f99 cfq-iosched: add ... |
1729 1730 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
1731 |
{ |
e00ef7997 cfq-iosched: get ... |
1732 |
if (!cfqq) |
a36e71f99 cfq-iosched: add ... |
1733 |
cfqq = cfq_get_next_queue(cfqd); |
6d048f531 cfq-iosched: deve... |
1734 |
|
22e2c507c [PATCH] Update cf... |
1735 |
__cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1736 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
1737 |
} |
d9e7620e6 cfq-iosched: rewo... |
1738 1739 1740 |
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, struct request *rq) { |
83096ebf1 block: convert to... |
1741 1742 |
if (blk_rq_pos(rq) >= cfqd->last_position) return blk_rq_pos(rq) - cfqd->last_position; |
d9e7620e6 cfq-iosched: rewo... |
1743 |
else |
83096ebf1 block: convert to... |
1744 |
return cfqd->last_position - blk_rq_pos(rq); |
d9e7620e6 cfq-iosched: rewo... |
1745 |
} |
b2c18e1e0 cfq: calculate th... |
1746 |
static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
e9ce335df cfq-iosched: fix ... |
1747 |
struct request *rq) |
6d048f531 cfq-iosched: deve... |
1748 |
{ |
e9ce335df cfq-iosched: fix ... |
1749 |
return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR; |
6d048f531 cfq-iosched: deve... |
1750 |
} |
a36e71f99 cfq-iosched: add ... |
1751 1752 1753 |
static struct cfq_queue *cfqq_close(struct cfq_data *cfqd, struct cfq_queue *cur_cfqq) { |
f2d1f0ae7 cfq-iosched: cach... |
1754 |
struct rb_root *root = &cfqd->prio_trees[cur_cfqq->org_ioprio]; |
a36e71f99 cfq-iosched: add ... |
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 |
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... |
1766 |
__cfqq = cfq_prio_tree_lookup(cfqd, root, sector, &parent, NULL); |
a36e71f99 cfq-iosched: add ... |
1767 1768 1769 1770 1771 1772 1773 1774 |
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 ... |
1775 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1776 |
return __cfqq; |
2e46e8b27 block: drop reque... |
1777 |
if (blk_rq_pos(__cfqq->next_rq) < sector) |
a36e71f99 cfq-iosched: add ... |
1778 1779 1780 1781 1782 1783 1784 |
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 ... |
1785 |
if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq)) |
a36e71f99 cfq-iosched: add ... |
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 |
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... |
1802 |
struct cfq_queue *cur_cfqq) |
6d048f531 cfq-iosched: deve... |
1803 |
{ |
a36e71f99 cfq-iosched: add ... |
1804 |
struct cfq_queue *cfqq; |
39c01b219 cfq-iosched: Do n... |
1805 1806 |
if (cfq_class_idle(cur_cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
1807 1808 1809 1810 |
if (!cfq_cfqq_sync(cur_cfqq)) return NULL; if (CFQQ_SEEKY(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
1811 |
/* |
b9d8f4c73 cfq: Optimization... |
1812 1813 1814 1815 1816 1817 |
* 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... |
1818 1819 1820 |
* 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... |
1821 |
*/ |
a36e71f99 cfq-iosched: add ... |
1822 1823 1824 |
cfqq = cfqq_close(cfqd, cur_cfqq); if (!cfqq) return NULL; |
8682e1f15 blkio: Provide so... |
1825 1826 1827 |
/* If new queue belongs to different cfq_group, don't choose it */ if (cur_cfqq->cfqg != cfqq->cfqg) return NULL; |
df5fe3e8e cfq: merge cooper... |
1828 1829 1830 1831 1832 |
/* * It only makes sense to merge sync queues. */ if (!cfq_cfqq_sync(cfqq)) return NULL; |
e6c5bc737 cfq: break apart ... |
1833 1834 |
if (CFQQ_SEEKY(cfqq)) return NULL; |
df5fe3e8e cfq: merge cooper... |
1835 |
|
c0324a020 cfq-iosched: reim... |
1836 1837 1838 1839 1840 |
/* * Do not merge queues of different priority classes */ if (cfq_class_rt(cfqq) != cfq_class_rt(cur_cfqq)) return NULL; |
a36e71f99 cfq-iosched: add ... |
1841 |
return cfqq; |
6d048f531 cfq-iosched: deve... |
1842 |
} |
a6d44e982 cfq-iosched: enab... |
1843 1844 1845 1846 1847 1848 1849 |
/* * Determine whether we should enforce idle window for this queue. */ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq) { enum wl_prio_t prio = cfqq_prio(cfqq); |
718eee057 cfq-iosched: fair... |
1850 |
struct cfq_rb_root *service_tree = cfqq->service_tree; |
a6d44e982 cfq-iosched: enab... |
1851 |
|
f04a64246 blkio: Keep queue... |
1852 1853 |
BUG_ON(!service_tree); BUG_ON(!service_tree->count); |
b6508c161 cfq-iosched: Do n... |
1854 1855 |
if (!cfqd->cfq_slice_idle) return false; |
a6d44e982 cfq-iosched: enab... |
1856 1857 1858 1859 1860 |
/* We never do for idle class queues. */ if (prio == IDLE_WORKLOAD) return false; /* We do for queues that were marked with idle window flag. */ |
3c764b7a6 cfq-iosched: make... |
1861 1862 |
if (cfq_cfqq_idle_window(cfqq) && !(blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)) |
a6d44e982 cfq-iosched: enab... |
1863 1864 1865 1866 1867 1868 |
return true; /* * Otherwise, we do only if they are the last ones * in their service tree. */ |
b1ffe737f cfq-iosched: Add ... |
1869 |
if (service_tree->count == 1 && cfq_cfqq_sync(cfqq)) |
c1e44756f cfq-iosched: do c... |
1870 |
return true; |
b1ffe737f cfq-iosched: Add ... |
1871 1872 |
cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d", service_tree->count); |
c1e44756f cfq-iosched: do c... |
1873 |
return false; |
a6d44e982 cfq-iosched: enab... |
1874 |
} |
6d048f531 cfq-iosched: deve... |
1875 |
static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
1876 |
{ |
1792669cc cfq-iosched: don'... |
1877 |
struct cfq_queue *cfqq = cfqd->active_queue; |
206dc69b3 [BLOCK] cfq-iosch... |
1878 |
struct cfq_io_context *cic; |
80bdf0c78 cfq-iosched: Impl... |
1879 |
unsigned long sl, group_idle = 0; |
7b14e3b52 [PATCH] cfq-iosch... |
1880 |
|
a68bbddba block: add queue ... |
1881 |
/* |
f7d7b7a7a block: as/cfq ssd... |
1882 1883 1884 |
* 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 ... |
1885 |
*/ |
f7d7b7a7a block: as/cfq ssd... |
1886 |
if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag) |
a68bbddba block: add queue ... |
1887 |
return; |
dd67d0515 [PATCH] rbtree: s... |
1888 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
6d048f531 cfq-iosched: deve... |
1889 |
WARN_ON(cfq_cfqq_slice_new(cfqq)); |
22e2c507c [PATCH] Update cf... |
1890 1891 1892 1893 |
/* * idle is disabled, either manually or by past process history */ |
80bdf0c78 cfq-iosched: Impl... |
1894 1895 1896 1897 1898 1899 1900 |
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... |
1901 |
|
22e2c507c [PATCH] Update cf... |
1902 |
/* |
8e550632c cfq-iosched: fix ... |
1903 |
* still active requests from this queue, don't idle |
7b679138b cfq-iosched: add ... |
1904 |
*/ |
8e550632c cfq-iosched: fix ... |
1905 |
if (cfqq->dispatched) |
7b679138b cfq-iosched: add ... |
1906 1907 1908 |
return; /* |
22e2c507c [PATCH] Update cf... |
1909 1910 |
* task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
1911 |
cic = cfqd->active_cic; |
66dac98ed io_context sharin... |
1912 |
if (!cic || !atomic_read(&cic->ioc->nr_tasks)) |
6d048f531 cfq-iosched: deve... |
1913 |
return; |
355b659c8 cfq-iosched: avoi... |
1914 1915 1916 1917 1918 1919 |
/* * If our average think time is larger than the remaining time * slice, then don't idle. This avoids overrunning the allotted * time slice. */ if (sample_valid(cic->ttime_samples) && |
b1ffe737f cfq-iosched: Add ... |
1920 1921 1922 |
(cfqq->slice_end - jiffies < cic->ttime_mean)) { cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%d", cic->ttime_mean); |
355b659c8 cfq-iosched: avoi... |
1923 |
return; |
b1ffe737f cfq-iosched: Add ... |
1924 |
} |
355b659c8 cfq-iosched: avoi... |
1925 |
|
80bdf0c78 cfq-iosched: Impl... |
1926 1927 1928 |
/* There are other queues in the group, don't do group idle */ if (group_idle && cfqq->cfqg->nr_cfqq > 1) return; |
3b18152c3 [PATCH] CFQ io sc... |
1929 |
cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
1930 |
|
80bdf0c78 cfq-iosched: Impl... |
1931 1932 1933 1934 |
if (group_idle) sl = cfqd->cfq_group_idle; else sl = cfqd->cfq_slice_idle; |
206dc69b3 [BLOCK] cfq-iosch... |
1935 |
|
7b14e3b52 [PATCH] cfq-iosch... |
1936 |
mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
e98ef89b3 cfq-iosched: Fixe... |
1937 |
cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg); |
80bdf0c78 cfq-iosched: Impl... |
1938 1939 |
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu group_idle: %d", sl, group_idle ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1940 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1941 1942 1943 |
/* * Move request from internal lists to the request queue dispatch list. */ |
165125e1e [BLOCK] Get rid o... |
1944 |
static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1945 |
{ |
3ed9a2965 cfq-iosched: impr... |
1946 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
1947 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
1948 |
|
7b679138b cfq-iosched: add ... |
1949 |
cfq_log_cfqq(cfqd, cfqq, "dispatch_insert"); |
06d218864 cfq: choose a new... |
1950 |
cfqq->next_rq = cfq_find_next_rq(cfqd, cfqq, rq); |
5380a101d [PATCH] cfq-iosch... |
1951 |
cfq_remove_request(rq); |
6d048f531 cfq-iosched: deve... |
1952 |
cfqq->dispatched++; |
80bdf0c78 cfq-iosched: Impl... |
1953 |
(RQ_CFQG(rq))->dispatched++; |
5380a101d [PATCH] cfq-iosch... |
1954 |
elv_dispatch_sort(q, rq); |
3ed9a2965 cfq-iosched: impr... |
1955 |
|
53c583d22 cfq-iosched: requ... |
1956 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++; |
c4e7893eb cfq-iosched: blkt... |
1957 |
cfqq->nr_sectors += blk_rq_sectors(rq); |
e98ef89b3 cfq-iosched: Fixe... |
1958 |
cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq), |
84c124da9 blkio: Changes to... |
1959 |
rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
1960 1961 1962 1963 1964 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
febffd618 cfq-iosched: kill... |
1965 |
static struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1966 |
{ |
30996f40b cfq-iosched: fix ... |
1967 |
struct request *rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1968 |
|
3b18152c3 [PATCH] CFQ io sc... |
1969 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
1970 |
return NULL; |
cb8874119 cfq-iosched: twea... |
1971 1972 |
cfq_mark_cfqq_fifo_expire(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
1973 1974 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1975 |
|
89850f7ee [PATCH] cfq-iosch... |
1976 |
rq = rq_entry_fifo(cfqq->fifo.next); |
30996f40b cfq-iosched: fix ... |
1977 |
if (time_before(jiffies, rq_fifo_time(rq))) |
7b679138b cfq-iosched: add ... |
1978 |
rq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1979 |
|
30996f40b cfq-iosched: fix ... |
1980 |
cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq); |
6d048f531 cfq-iosched: deve... |
1981 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
1982 |
} |
22e2c507c [PATCH] Update cf... |
1983 1984 1985 1986 |
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 |
1987 |
|
22e2c507c [PATCH] Update cf... |
1988 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
1989 |
|
b9f8ce059 cfq-iosched: alge... |
1990 |
return 2 * base_rq * (IOPRIO_BE_NR - cfqq->ioprio); |
1da177e4c Linux-2.6.12-rc2 |
1991 |
} |
22e2c507c [PATCH] Update cf... |
1992 |
/* |
df5fe3e8e cfq: merge cooper... |
1993 1994 1995 1996 1997 1998 1999 |
* 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 ... |
2000 |
process_refs = cfqq->ref - io_refs; |
df5fe3e8e cfq: merge cooper... |
2001 2002 2003 2004 2005 2006 |
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 ... |
2007 |
int process_refs, new_process_refs; |
df5fe3e8e cfq: merge cooper... |
2008 |
struct cfq_queue *__cfqq; |
c10b61f09 cfq: Don't allow ... |
2009 2010 2011 2012 2013 2014 2015 2016 |
/* * 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... |
2017 2018 2019 2020 2021 2022 2023 2024 |
/* 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 ... |
2025 |
new_process_refs = cfqq_process_refs(new_cfqq); |
df5fe3e8e cfq: merge cooper... |
2026 2027 2028 2029 |
/* * If the process for the cfqq has gone away, there is no * sense in merging the queues. */ |
c10b61f09 cfq: Don't allow ... |
2030 |
if (process_refs == 0 || new_process_refs == 0) |
df5fe3e8e cfq: merge cooper... |
2031 |
return; |
e6c5bc737 cfq: break apart ... |
2032 2033 2034 |
/* * Merge in the direction of the lesser amount of work. */ |
e6c5bc737 cfq: break apart ... |
2035 2036 |
if (new_process_refs >= process_refs) { cfqq->new_cfqq = new_cfqq; |
30d7b9448 block cfq: don't ... |
2037 |
new_cfqq->ref += process_refs; |
e6c5bc737 cfq: break apart ... |
2038 2039 |
} else { new_cfqq->new_cfqq = cfqq; |
30d7b9448 block cfq: don't ... |
2040 |
cfqq->ref += new_process_refs; |
e6c5bc737 cfq: break apart ... |
2041 |
} |
df5fe3e8e cfq: merge cooper... |
2042 |
} |
cdb16e8f7 blkio: Introduce ... |
2043 |
static enum wl_type_t cfq_choose_wl(struct cfq_data *cfqd, |
65b32a573 cfq-iosched: Remo... |
2044 |
struct cfq_group *cfqg, enum wl_prio_t prio) |
718eee057 cfq-iosched: fair... |
2045 2046 2047 2048 2049 2050 |
{ struct cfq_queue *queue; int i; bool key_valid = false; unsigned long lowest_key = 0; enum wl_type_t cur_best = SYNC_NOIDLE_WORKLOAD; |
65b32a573 cfq-iosched: Remo... |
2051 2052 2053 |
for (i = 0; i <= SYNC_WORKLOAD; ++i) { /* select the one with lowest rb_key */ queue = cfq_rb_first(service_tree_for(cfqg, prio, i)); |
718eee057 cfq-iosched: fair... |
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 |
if (queue && (!key_valid || time_before(queue->rb_key, lowest_key))) { lowest_key = queue->rb_key; cur_best = i; key_valid = true; } } return cur_best; } |
cdb16e8f7 blkio: Introduce ... |
2064 |
static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg) |
718eee057 cfq-iosched: fair... |
2065 |
{ |
718eee057 cfq-iosched: fair... |
2066 2067 |
unsigned slice; unsigned count; |
cdb16e8f7 blkio: Introduce ... |
2068 |
struct cfq_rb_root *st; |
58ff82f34 blkio: Implement ... |
2069 |
unsigned group_slice; |
e4ea0c16a block cfq: select... |
2070 |
enum wl_prio_t original_prio = cfqd->serving_prio; |
1fa8f6d68 blkio: Introduce ... |
2071 |
|
718eee057 cfq-iosched: fair... |
2072 |
/* Choose next priority. RT > BE > IDLE */ |
58ff82f34 blkio: Implement ... |
2073 |
if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg)) |
718eee057 cfq-iosched: fair... |
2074 |
cfqd->serving_prio = RT_WORKLOAD; |
58ff82f34 blkio: Implement ... |
2075 |
else if (cfq_group_busy_queues_wl(BE_WORKLOAD, cfqd, cfqg)) |
718eee057 cfq-iosched: fair... |
2076 2077 2078 2079 2080 2081 |
cfqd->serving_prio = BE_WORKLOAD; else { cfqd->serving_prio = IDLE_WORKLOAD; cfqd->workload_expires = jiffies + 1; return; } |
e4ea0c16a block cfq: select... |
2082 2083 |
if (original_prio != cfqd->serving_prio) goto new_workload; |
718eee057 cfq-iosched: fair... |
2084 2085 2086 2087 2088 |
/* * For RT and BE, we have to choose also the type * (SYNC, SYNC_NOIDLE, ASYNC), and to compute a workload * expiration time */ |
65b32a573 cfq-iosched: Remo... |
2089 |
st = service_tree_for(cfqg, cfqd->serving_prio, cfqd->serving_type); |
cdb16e8f7 blkio: Introduce ... |
2090 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2091 2092 |
/* |
65b32a573 cfq-iosched: Remo... |
2093 |
* check workload expiration, and that we still have other queues ready |
718eee057 cfq-iosched: fair... |
2094 |
*/ |
65b32a573 cfq-iosched: Remo... |
2095 |
if (count && !time_after(jiffies, cfqd->workload_expires)) |
718eee057 cfq-iosched: fair... |
2096 |
return; |
e4ea0c16a block cfq: select... |
2097 |
new_workload: |
718eee057 cfq-iosched: fair... |
2098 2099 |
/* otherwise select new workload type */ cfqd->serving_type = |
65b32a573 cfq-iosched: Remo... |
2100 2101 |
cfq_choose_wl(cfqd, cfqg, cfqd->serving_prio); st = service_tree_for(cfqg, cfqd->serving_prio, cfqd->serving_type); |
cdb16e8f7 blkio: Introduce ... |
2102 |
count = st->count; |
718eee057 cfq-iosched: fair... |
2103 2104 2105 2106 2107 2108 |
/* * 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 ... |
2109 2110 2111 2112 2113 |
group_slice = cfq_group_slice(cfqd, cfqg); slice = group_slice * count / max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_prio], cfq_group_busy_queues_wl(cfqd->serving_prio, cfqd, cfqg)); |
718eee057 cfq-iosched: fair... |
2114 |
|
f26bd1f0a blkio: Determine ... |
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 |
if (cfqd->serving_type == ASYNC_WORKLOAD) { unsigned int tmp; /* * 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. */ tmp = cfq_target_latency * cfqg_busy_async_queues(cfqd, cfqg); tmp = tmp/cfqd->busy_queues; slice = min_t(unsigned, slice, tmp); |
718eee057 cfq-iosched: fair... |
2128 2129 2130 |
/* async workload slice is scaled down according to * the sync/async slice ratio. */ slice = slice * cfqd->cfq_slice[0] / cfqd->cfq_slice[1]; |
f26bd1f0a blkio: Determine ... |
2131 |
} else |
718eee057 cfq-iosched: fair... |
2132 2133 2134 2135 |
/* sync workload slice is at least 2 * cfq_slice_idle */ slice = max(slice, 2 * cfqd->cfq_slice_idle); slice = max_t(unsigned, slice, CFQ_MIN_TT); |
b1ffe737f cfq-iosched: Add ... |
2136 |
cfq_log(cfqd, "workload slice:%d", slice); |
718eee057 cfq-iosched: fair... |
2137 2138 |
cfqd->workload_expires = jiffies + slice; } |
1fa8f6d68 blkio: Introduce ... |
2139 2140 2141 |
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd) { struct cfq_rb_root *st = &cfqd->grp_service_tree; |
25bc6b077 blkio: Introduce ... |
2142 |
struct cfq_group *cfqg; |
1fa8f6d68 blkio: Introduce ... |
2143 2144 2145 |
if (RB_EMPTY_ROOT(&st->rb)) return NULL; |
25bc6b077 blkio: Introduce ... |
2146 |
cfqg = cfq_rb_first_group(st); |
25bc6b077 blkio: Introduce ... |
2147 2148 |
update_min_vdisktime(st); return cfqg; |
1fa8f6d68 blkio: Introduce ... |
2149 |
} |
cdb16e8f7 blkio: Introduce ... |
2150 2151 |
static void cfq_choose_cfqg(struct cfq_data *cfqd) { |
1fa8f6d68 blkio: Introduce ... |
2152 2153 2154 |
struct cfq_group *cfqg = cfq_get_next_cfqg(cfqd); cfqd->serving_group = cfqg; |
dae739ebc blkio: Group time... |
2155 2156 2157 2158 2159 2160 |
/* Restore the workload type data */ if (cfqg->saved_workload_slice) { cfqd->workload_expires = jiffies + cfqg->saved_workload_slice; cfqd->serving_type = cfqg->saved_workload; cfqd->serving_prio = cfqg->saved_serving_prio; |
66ae29197 cfq: set workload... |
2161 2162 |
} else cfqd->workload_expires = jiffies - 1; |
1fa8f6d68 blkio: Introduce ... |
2163 |
choose_service_tree(cfqd, cfqg); |
cdb16e8f7 blkio: Introduce ... |
2164 |
} |
df5fe3e8e cfq: merge cooper... |
2165 |
/* |
498d3aa2b [PATCH] cfq-iosch... |
2166 2167 |
* 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... |
2168 |
*/ |
1b5ed5e1f [BLOCK] cfq-iosch... |
2169 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
2170 |
{ |
a36e71f99 cfq-iosched: add ... |
2171 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2172 |
|
22e2c507c [PATCH] Update cf... |
2173 2174 2175 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
2176 |
|
f04a64246 blkio: Keep queue... |
2177 2178 |
if (!cfqd->rq_queued) return NULL; |
c244bb50a cfq-iosched: Get ... |
2179 2180 2181 2182 2183 2184 |
/* * 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... |
2185 |
/* |
6d048f531 cfq-iosched: deve... |
2186 |
* The active queue has run out of time, expire it and select new. |
22e2c507c [PATCH] Update cf... |
2187 |
*/ |
7667aa063 cfq-iosched: Take... |
2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 |
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... |
2198 2199 2200 |
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... |
2201 |
goto keep_queue; |
82bbbf28d Fix a CFQ crash i... |
2202 |
} else |
80bdf0c78 cfq-iosched: Impl... |
2203 |
goto check_group_idle; |
7667aa063 cfq-iosched: Take... |
2204 |
} |
1da177e4c Linux-2.6.12-rc2 |
2205 |
|
22e2c507c [PATCH] Update cf... |
2206 |
/* |
6d048f531 cfq-iosched: deve... |
2207 2208 |
* The active queue has requests and isn't expired, allow it to * dispatch. |
22e2c507c [PATCH] Update cf... |
2209 |
*/ |
dd67d0515 [PATCH] rbtree: s... |
2210 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
2211 |
goto keep_queue; |
6d048f531 cfq-iosched: deve... |
2212 2213 |
/* |
a36e71f99 cfq-iosched: add ... |
2214 2215 2216 |
* 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... |
2217 |
* tree. If possible, merge the expiring queue with the new cfqq. |
a36e71f99 cfq-iosched: add ... |
2218 |
*/ |
b3b6d0408 cfq: change the m... |
2219 |
new_cfqq = cfq_close_cooperator(cfqd, cfqq); |
df5fe3e8e cfq: merge cooper... |
2220 2221 2222 |
if (new_cfqq) { if (!cfqq->new_cfqq) cfq_setup_merge(cfqq, new_cfqq); |
a36e71f99 cfq-iosched: add ... |
2223 |
goto expire; |
df5fe3e8e cfq: merge cooper... |
2224 |
} |
a36e71f99 cfq-iosched: add ... |
2225 2226 |
/* |
6d048f531 cfq-iosched: deve... |
2227 2228 2229 2230 |
* 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. */ |
80bdf0c78 cfq-iosched: Impl... |
2231 2232 2233 2234 |
if (timer_pending(&cfqd->idle_slice_timer)) { cfqq = NULL; goto keep_queue; } |
8e1ac6655 cfq-iosched: don'... |
2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 |
/* * 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) || (cfqq->slice_end - jiffies > jiffies - cfqq->slice_start))) { cfq_clear_cfqq_deep(cfqq); cfq_clear_cfqq_idle_window(cfqq); } |
80bdf0c78 cfq-iosched: Impl... |
2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 |
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: if (cfqd->cfq_group_idle && cfqq->cfqg->nr_cfqq == 1 && cfqq->cfqg->dispatched) { |
caaa5f9f0 [PATCH] cfq-iosch... |
2257 2258 |
cfqq = NULL; goto keep_queue; |
22e2c507c [PATCH] Update cf... |
2259 |
} |
3b18152c3 [PATCH] CFQ io sc... |
2260 |
expire: |
e5ff082e8 blkio: Fix anothe... |
2261 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
2262 |
new_queue: |
718eee057 cfq-iosched: fair... |
2263 2264 2265 2266 2267 |
/* * Current queue expired. Check if we have to switch to a new * service tree */ if (!new_cfqq) |
cdb16e8f7 blkio: Introduce ... |
2268 |
cfq_choose_cfqg(cfqd); |
718eee057 cfq-iosched: fair... |
2269 |
|
a36e71f99 cfq-iosched: add ... |
2270 |
cfqq = cfq_set_active_queue(cfqd, new_cfqq); |
22e2c507c [PATCH] Update cf... |
2271 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
2272 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
2273 |
} |
febffd618 cfq-iosched: kill... |
2274 |
static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) |
d9e7620e6 cfq-iosched: rewo... |
2275 2276 2277 2278 2279 2280 2281 2282 2283 |
{ 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... |
2284 2285 |
/* By default cfqq is not expired if it is empty. Do it explicitly */ |
e5ff082e8 blkio: Fix anothe... |
2286 |
__cfq_slice_expired(cfqq->cfqd, cfqq, 0); |
d9e7620e6 cfq-iosched: rewo... |
2287 2288 |
return dispatched; } |
498d3aa2b [PATCH] cfq-iosch... |
2289 2290 2291 2292 |
/* * Drain our current requests. Used for barriers and when switching * io schedulers on-the-fly. */ |
d9e7620e6 cfq-iosched: rewo... |
2293 |
static int cfq_forced_dispatch(struct cfq_data *cfqd) |
1b5ed5e1f [BLOCK] cfq-iosch... |
2294 |
{ |
0871714e0 cfq-iosched: rela... |
2295 |
struct cfq_queue *cfqq; |
d9e7620e6 cfq-iosched: rewo... |
2296 |
int dispatched = 0; |
cdb16e8f7 blkio: Introduce ... |
2297 |
|
3440c49f5 cfq-iosched: Fix ... |
2298 |
/* Expire the timeslice of the current active queue first */ |
e5ff082e8 blkio: Fix anothe... |
2299 |
cfq_slice_expired(cfqd, 0); |
3440c49f5 cfq-iosched: Fix ... |
2300 2301 |
while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) { __cfq_set_active_queue(cfqd, cfqq); |
f04a64246 blkio: Keep queue... |
2302 |
dispatched += __cfq_forced_dispatch_cfqq(cfqq); |
3440c49f5 cfq-iosched: Fix ... |
2303 |
} |
1b5ed5e1f [BLOCK] cfq-iosch... |
2304 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
2305 |
BUG_ON(cfqd->busy_queues); |
6923715ae cfq: remove extra... |
2306 |
cfq_log(cfqd, "forced_dispatch=%d", dispatched); |
1b5ed5e1f [BLOCK] cfq-iosch... |
2307 2308 |
return dispatched; } |
abc3c744d cfq-iosched: quan... |
2309 2310 2311 2312 2313 |
static inline bool cfq_slice_used_soon(struct cfq_data *cfqd, struct cfq_queue *cfqq) { /* the queue hasn't finished any request, can't estimate */ if (cfq_cfqq_slice_new(cfqq)) |
c1e44756f cfq-iosched: do c... |
2314 |
return true; |
abc3c744d cfq-iosched: quan... |
2315 2316 |
if (time_after(jiffies + cfqd->cfq_slice_idle * cfqq->dispatched, cfqq->slice_end)) |
c1e44756f cfq-iosched: do c... |
2317 |
return true; |
abc3c744d cfq-iosched: quan... |
2318 |
|
c1e44756f cfq-iosched: do c... |
2319 |
return false; |
abc3c744d cfq-iosched: quan... |
2320 |
} |
0b182d617 cfq-iosched: abst... |
2321 |
static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
2f5cb7381 cfq-iosched: chan... |
2322 |
{ |
2f5cb7381 cfq-iosched: chan... |
2323 |
unsigned int max_dispatch; |
22e2c507c [PATCH] Update cf... |
2324 |
|
2f5cb7381 cfq-iosched: chan... |
2325 |
/* |
5ad531db6 cfq-iosched: drai... |
2326 2327 |
* Drain async requests before we start sync IO */ |
53c583d22 cfq-iosched: requ... |
2328 |
if (cfq_should_idle(cfqd, cfqq) && cfqd->rq_in_flight[BLK_RW_ASYNC]) |
0b182d617 cfq-iosched: abst... |
2329 |
return false; |
5ad531db6 cfq-iosched: drai... |
2330 2331 |
/* |
2f5cb7381 cfq-iosched: chan... |
2332 2333 |
* If this is an async queue and we have sync IO in flight, let it wait */ |
53c583d22 cfq-iosched: requ... |
2334 |
if (cfqd->rq_in_flight[BLK_RW_SYNC] && !cfq_cfqq_sync(cfqq)) |
0b182d617 cfq-iosched: abst... |
2335 |
return false; |
2f5cb7381 cfq-iosched: chan... |
2336 |
|
abc3c744d cfq-iosched: quan... |
2337 |
max_dispatch = max_t(unsigned int, cfqd->cfq_quantum / 2, 1); |
2f5cb7381 cfq-iosched: chan... |
2338 2339 |
if (cfq_class_idle(cfqq)) max_dispatch = 1; |
b4878f245 [PATCH] 02/05: up... |
2340 |
|
2f5cb7381 cfq-iosched: chan... |
2341 2342 2343 2344 |
/* * Does this cfqq already have too much IO in flight? */ if (cfqq->dispatched >= max_dispatch) { |
ef8a41df8 cfq-iosched: give... |
2345 |
bool promote_sync = false; |
2f5cb7381 cfq-iosched: chan... |
2346 2347 2348 |
/* * idle queue must always only have a single IO in flight */ |
3ed9a2965 cfq-iosched: impr... |
2349 |
if (cfq_class_idle(cfqq)) |
0b182d617 cfq-iosched: abst... |
2350 |
return false; |
3ed9a2965 cfq-iosched: impr... |
2351 |
|
2f5cb7381 cfq-iosched: chan... |
2352 |
/* |
c4ade94fc cfq-iosched: remo... |
2353 2354 |
* If there is only one sync queue * we can ignore async queue here and give the sync |
ef8a41df8 cfq-iosched: give... |
2355 2356 2357 2358 |
* 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... |
2359 2360 |
if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) promote_sync = true; |
ef8a41df8 cfq-iosched: give... |
2361 2362 |
/* |
2f5cb7381 cfq-iosched: chan... |
2363 2364 |
* We have other queues, don't allow more IO from this one */ |
ef8a41df8 cfq-iosched: give... |
2365 2366 |
if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && !promote_sync) |
0b182d617 cfq-iosched: abst... |
2367 |
return false; |
9ede209e8 cfq-iosched: impr... |
2368 |
|
2f5cb7381 cfq-iosched: chan... |
2369 |
/* |
474b18ccc cfq-iosched: no d... |
2370 |
* Sole queue user, no limit |
365722bb9 cfq-iosched: dela... |
2371 |
*/ |
ef8a41df8 cfq-iosched: give... |
2372 |
if (cfqd->busy_queues == 1 || promote_sync) |
abc3c744d cfq-iosched: quan... |
2373 2374 2375 2376 2377 2378 2379 2380 2381 |
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... |
2382 2383 2384 2385 2386 2387 2388 |
} /* * 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... |
2389 |
if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) { |
573412b29 cfq-iosched: redu... |
2390 |
unsigned long last_sync = jiffies - cfqd->last_delayed_sync; |
8e2967555 cfq-iosched: impl... |
2391 |
unsigned int depth; |
365722bb9 cfq-iosched: dela... |
2392 |
|
61f0c1dca cfq-iosched: use ... |
2393 |
depth = last_sync / cfqd->cfq_slice[1]; |
e00c54c36 cfq-iosched: don'... |
2394 2395 |
if (!depth && !cfqq->dispatched) depth = 1; |
8e2967555 cfq-iosched: impl... |
2396 2397 |
if (depth < max_dispatch) max_dispatch = depth; |
2f5cb7381 cfq-iosched: chan... |
2398 |
} |
3ed9a2965 cfq-iosched: impr... |
2399 |
|
0b182d617 cfq-iosched: abst... |
2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 |
/* * 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) { struct cfq_io_context *cic = RQ_CIC(rq); atomic_long_inc(&cic->ioc->refcount); 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... |
2458 |
return 0; |
2f5cb7381 cfq-iosched: chan... |
2459 |
/* |
0b182d617 cfq-iosched: abst... |
2460 |
* Dispatch a request from this cfqq, if it is allowed |
2f5cb7381 cfq-iosched: chan... |
2461 |
*/ |
0b182d617 cfq-iosched: abst... |
2462 2463 |
if (!cfq_dispatch_request(cfqd, cfqq)) return 0; |
2f5cb7381 cfq-iosched: chan... |
2464 |
cfqq->slice_dispatch++; |
b029195dd cfq-iosched: don'... |
2465 |
cfq_clear_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
2466 |
|
2f5cb7381 cfq-iosched: chan... |
2467 2468 2469 2470 2471 2472 2473 2474 |
/* * 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))) { cfqq->slice_end = jiffies + 1; |
e5ff082e8 blkio: Fix anothe... |
2475 |
cfq_slice_expired(cfqd, 0); |
1da177e4c Linux-2.6.12-rc2 |
2476 |
} |
b217a903a cfq: fix the log ... |
2477 |
cfq_log_cfqq(cfqd, cfqq, "dispatched a request"); |
2f5cb7381 cfq-iosched: chan... |
2478 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
2479 |
} |
1da177e4c Linux-2.6.12-rc2 |
2480 |
/* |
5e7053747 [PATCH] cfq-iosch... |
2481 2482 |
* 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 |
2483 |
* |
b1c357696 blkio: Take care ... |
2484 |
* Each cfq queue took a reference on the parent group. Drop it now. |
1da177e4c Linux-2.6.12-rc2 |
2485 2486 2487 2488 |
* queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
2489 |
struct cfq_data *cfqd = cfqq->cfqd; |
0bbfeb832 cfq-iosched: Alwa... |
2490 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
2491 |
|
30d7b9448 block cfq: don't ... |
2492 |
BUG_ON(cfqq->ref <= 0); |
1da177e4c Linux-2.6.12-rc2 |
2493 |
|
30d7b9448 block cfq: don't ... |
2494 2495 |
cfqq->ref--; if (cfqq->ref) |
1da177e4c Linux-2.6.12-rc2 |
2496 |
return; |
7b679138b cfq-iosched: add ... |
2497 |
cfq_log_cfqq(cfqd, cfqq, "put_queue"); |
1da177e4c Linux-2.6.12-rc2 |
2498 |
BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
2499 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
b1c357696 blkio: Take care ... |
2500 |
cfqg = cfqq->cfqg; |
1da177e4c Linux-2.6.12-rc2 |
2501 |
|
28f95cbc3 cfq-iosched: remo... |
2502 |
if (unlikely(cfqd->active_queue == cfqq)) { |
e5ff082e8 blkio: Fix anothe... |
2503 |
__cfq_slice_expired(cfqd, cfqq, 0); |
23e018a1b block: get rid of... |
2504 |
cfq_schedule_dispatch(cfqd); |
28f95cbc3 cfq-iosched: remo... |
2505 |
} |
22e2c507c [PATCH] Update cf... |
2506 |
|
f04a64246 blkio: Keep queue... |
2507 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
2508 |
kmem_cache_free(cfq_pool, cfqq); |
b1c357696 blkio: Take care ... |
2509 |
cfq_put_cfqg(cfqg); |
1da177e4c Linux-2.6.12-rc2 |
2510 |
} |
d6de8be71 cfq-iosched: fix ... |
2511 |
/* |
5f45c6958 cfq-iosched: read... |
2512 |
* Call func for each cic attached to this ioc. |
d6de8be71 cfq-iosched: fix ... |
2513 |
*/ |
07416d29b cfq-iosched: fix ... |
2514 |
static void |
5f45c6958 cfq-iosched: read... |
2515 2516 |
call_for_each_cic(struct io_context *ioc, void (*func)(struct io_context *, struct cfq_io_context *)) |
07416d29b cfq-iosched: fix ... |
2517 2518 2519 |
{ struct cfq_io_context *cic; struct hlist_node *n; |
5f45c6958 cfq-iosched: read... |
2520 |
rcu_read_lock(); |
07416d29b cfq-iosched: fix ... |
2521 2522 |
hlist_for_each_entry_rcu(cic, n, &ioc->cic_list, cic_list) func(ioc, cic); |
07416d29b cfq-iosched: fix ... |
2523 |
|
4ac845a2e block: cfq: make ... |
2524 |
rcu_read_unlock(); |
34e6bbf23 cfq-iosched: fix ... |
2525 2526 2527 2528 2529 2530 2531 2532 2533 |
} static void cfq_cic_free_rcu(struct rcu_head *head) { struct cfq_io_context *cic; cic = container_of(head, struct cfq_io_context, rcu_head); kmem_cache_free(cfq_ioc_pool, cic); |
245b2e70e percpu: clean up ... |
2534 |
elv_ioc_count_dec(cfq_ioc_count); |
34e6bbf23 cfq-iosched: fix ... |
2535 |
|
9a11b4ed0 cfq-iosched: prop... |
2536 2537 2538 2539 2540 2541 2542 |
if (ioc_gone) { /* * CFQ scheduler is exiting, grab exit lock and check * the pending io context count. If it hits zero, * complete ioc_gone and set it back to NULL */ spin_lock(&ioc_gone_lock); |
245b2e70e percpu: clean up ... |
2543 |
if (ioc_gone && !elv_ioc_count_read(cfq_ioc_count)) { |
9a11b4ed0 cfq-iosched: prop... |
2544 2545 2546 2547 2548 |
complete(ioc_gone); ioc_gone = NULL; } spin_unlock(&ioc_gone_lock); } |
34e6bbf23 cfq-iosched: fix ... |
2549 |
} |
4ac845a2e block: cfq: make ... |
2550 |
|
34e6bbf23 cfq-iosched: fix ... |
2551 2552 2553 |
static void cfq_cic_free(struct cfq_io_context *cic) { call_rcu(&cic->rcu_head, cfq_cic_free_rcu); |
4ac845a2e block: cfq: make ... |
2554 2555 2556 2557 2558 |
} static void cic_free_func(struct io_context *ioc, struct cfq_io_context *cic) { unsigned long flags; |
bca4b914b cfq-iosched: remo... |
2559 |
unsigned long dead_key = (unsigned long) cic->key; |
4ac845a2e block: cfq: make ... |
2560 |
|
bca4b914b cfq-iosched: remo... |
2561 |
BUG_ON(!(dead_key & CIC_DEAD_KEY)); |
4ac845a2e block: cfq: make ... |
2562 2563 |
spin_lock_irqsave(&ioc->lock, flags); |
80b15c738 cfq-iosched: comp... |
2564 |
radix_tree_delete(&ioc->radix_root, dead_key >> CIC_DEAD_INDEX_SHIFT); |
ffc4e7595 cfq-iosched: add ... |
2565 |
hlist_del_rcu(&cic->cic_list); |
4ac845a2e block: cfq: make ... |
2566 |
spin_unlock_irqrestore(&ioc->lock, flags); |
34e6bbf23 cfq-iosched: fix ... |
2567 |
cfq_cic_free(cic); |
4ac845a2e block: cfq: make ... |
2568 |
} |
d6de8be71 cfq-iosched: fix ... |
2569 2570 2571 2572 2573 |
/* * Must be called with rcu_read_lock() held or preemption otherwise disabled. * Only two callers of this - ->dtor() which is called with the rcu_read_lock(), * and ->trim() which is called with the task lock held */ |
4ac845a2e block: cfq: make ... |
2574 2575 |
static void cfq_free_io_context(struct io_context *ioc) { |
4ac845a2e block: cfq: make ... |
2576 |
/* |
34e6bbf23 cfq-iosched: fix ... |
2577 2578 2579 2580 |
* ioc->refcount is zero here, or we are called from elv_unregister(), * so no more cic's are allowed to be linked into this ioc. So it * should be ok to iterate over the known list, we will see all cic's * since no new ones are added. |
4ac845a2e block: cfq: make ... |
2581 |
*/ |
5f45c6958 cfq-iosched: read... |
2582 |
call_for_each_cic(ioc, cic_free_func); |
1da177e4c Linux-2.6.12-rc2 |
2583 |
} |
d02a2c077 cfq-iosched: fix ... |
2584 |
static void cfq_put_cooperator(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
2585 |
{ |
df5fe3e8e cfq: merge cooper... |
2586 |
struct cfq_queue *__cfqq, *next; |
df5fe3e8e cfq: merge cooper... |
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 |
/* * 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 ... |
2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 |
} 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... |
2613 |
|
89850f7ee [PATCH] cfq-iosch... |
2614 2615 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
2616 |
|
89850f7ee [PATCH] cfq-iosch... |
2617 2618 2619 |
static void __cfq_exit_single_io_context(struct cfq_data *cfqd, struct cfq_io_context *cic) { |
4faa3c815 cfq-iosched: do n... |
2620 |
struct io_context *ioc = cic->ioc; |
fc46379da [PATCH] cfq-iosch... |
2621 |
list_del_init(&cic->queue_list); |
4ac845a2e block: cfq: make ... |
2622 2623 |
/* |
bca4b914b cfq-iosched: remo... |
2624 |
* Make sure dead mark is seen for dead queues |
4ac845a2e block: cfq: make ... |
2625 |
*/ |
fc46379da [PATCH] cfq-iosch... |
2626 |
smp_wmb(); |
bca4b914b cfq-iosched: remo... |
2627 |
cic->key = cfqd_dead_key(cfqd); |
fc46379da [PATCH] cfq-iosch... |
2628 |
|
4faa3c815 cfq-iosched: do n... |
2629 2630 |
if (ioc->ioc_data == cic) rcu_assign_pointer(ioc->ioc_data, NULL); |
ff6657c6c cfq-iosched: get ... |
2631 2632 2633 |
if (cic->cfqq[BLK_RW_ASYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]); cic->cfqq[BLK_RW_ASYNC] = NULL; |
12a057321 [PATCH] keep sync... |
2634 |
} |
ff6657c6c cfq-iosched: get ... |
2635 2636 2637 |
if (cic->cfqq[BLK_RW_SYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_SYNC]); cic->cfqq[BLK_RW_SYNC] = NULL; |
12a057321 [PATCH] keep sync... |
2638 |
} |
89850f7ee [PATCH] cfq-iosch... |
2639 |
} |
4ac845a2e block: cfq: make ... |
2640 2641 |
static void cfq_exit_single_io_context(struct io_context *ioc, struct cfq_io_context *cic) |
89850f7ee [PATCH] cfq-iosch... |
2642 |
{ |
bca4b914b cfq-iosched: remo... |
2643 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
89850f7ee [PATCH] cfq-iosch... |
2644 |
|
89850f7ee [PATCH] cfq-iosch... |
2645 |
if (cfqd) { |
165125e1e [BLOCK] Get rid o... |
2646 |
struct request_queue *q = cfqd->queue; |
4ac845a2e block: cfq: make ... |
2647 |
unsigned long flags; |
89850f7ee [PATCH] cfq-iosch... |
2648 |
|
4ac845a2e block: cfq: make ... |
2649 |
spin_lock_irqsave(q->queue_lock, flags); |
62c1fe9d9 cfq-iosched: fix ... |
2650 2651 2652 2653 2654 2655 |
/* * Ensure we get a fresh copy of the ->key to prevent * race between exiting task and queue */ smp_read_barrier_depends(); |
bca4b914b cfq-iosched: remo... |
2656 |
if (cic->key == cfqd) |
62c1fe9d9 cfq-iosched: fix ... |
2657 |
__cfq_exit_single_io_context(cfqd, cic); |
4ac845a2e block: cfq: make ... |
2658 |
spin_unlock_irqrestore(q->queue_lock, flags); |
89850f7ee [PATCH] cfq-iosch... |
2659 |
} |
1da177e4c Linux-2.6.12-rc2 |
2660 |
} |
498d3aa2b [PATCH] cfq-iosch... |
2661 2662 2663 2664 |
/* * The process that ioc belongs to has exited, we need to clean up * and put the internal structures we have that belongs to that process. */ |
e2d74ac06 [PATCH] [BLOCK] c... |
2665 |
static void cfq_exit_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
2666 |
{ |
4ac845a2e block: cfq: make ... |
2667 |
call_for_each_cic(ioc, cfq_exit_single_io_context); |
1da177e4c Linux-2.6.12-rc2 |
2668 |
} |
22e2c507c [PATCH] Update cf... |
2669 |
static struct cfq_io_context * |
8267e268e [PATCH] gfp_t: bl... |
2670 |
cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
2671 |
{ |
b5deef901 [PATCH] Make sure... |
2672 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
2673 |
|
94f6030ca Slab allocators: ... |
2674 2675 |
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
2676 |
if (cic) { |
22e2c507c [PATCH] Update cf... |
2677 |
cic->last_end_request = jiffies; |
553698f94 [PATCH] cfq-iosch... |
2678 |
INIT_LIST_HEAD(&cic->queue_list); |
ffc4e7595 cfq-iosched: add ... |
2679 |
INIT_HLIST_NODE(&cic->cic_list); |
22e2c507c [PATCH] Update cf... |
2680 2681 |
cic->dtor = cfq_free_io_context; cic->exit = cfq_exit_io_context; |
245b2e70e percpu: clean up ... |
2682 |
elv_ioc_count_inc(cfq_ioc_count); |
1da177e4c Linux-2.6.12-rc2 |
2683 2684 2685 2686 |
} return cic; } |
fd0928df9 ioprio: move io p... |
2687 |
static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc) |
22e2c507c [PATCH] Update cf... |
2688 2689 2690 |
{ struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
2691 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
2692 |
return; |
fd0928df9 ioprio: move io p... |
2693 |
ioprio_class = IOPRIO_PRIO_CLASS(ioc->ioprio); |
22e2c507c [PATCH] Update cf... |
2694 |
switch (ioprio_class) { |
fe094d98e cfq-iosched: make... |
2695 2696 2697 2698 2699 |
default: printk(KERN_ERR "cfq: bad prio %x ", ioprio_class); case IOPRIO_CLASS_NONE: /* |
6d63c2755 cfq-iosched: make... |
2700 |
* no prio set, inherit CPU scheduling settings |
fe094d98e cfq-iosched: make... |
2701 2702 |
*/ cfqq->ioprio = task_nice_ioprio(tsk); |
6d63c2755 cfq-iosched: make... |
2703 |
cfqq->ioprio_class = task_nice_ioclass(tsk); |
fe094d98e cfq-iosched: make... |
2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 |
break; case IOPRIO_CLASS_RT: cfqq->ioprio = task_ioprio(ioc); cfqq->ioprio_class = IOPRIO_CLASS_RT; break; case IOPRIO_CLASS_BE: cfqq->ioprio = task_ioprio(ioc); 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... |
2718 2719 2720 2721 2722 2723 2724 2725 |
} /* * keep track of original prio settings in case we have to temporarily * elevate the priority of this queue */ cfqq->org_ioprio = cfqq->ioprio; cfqq->org_ioprio_class = cfqq->ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
2726 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
2727 |
} |
febffd618 cfq-iosched: kill... |
2728 |
static void changed_ioprio(struct io_context *ioc, struct cfq_io_context *cic) |
22e2c507c [PATCH] Update cf... |
2729 |
{ |
bca4b914b cfq-iosched: remo... |
2730 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
478a82b0e [PATCH] switch to... |
2731 |
struct cfq_queue *cfqq; |
c1b707d25 [PATCH] CFQ: bad ... |
2732 |
unsigned long flags; |
35e6077cb [PATCH] cfq-iosch... |
2733 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
2734 2735 |
if (unlikely(!cfqd)) return; |
c1b707d25 [PATCH] CFQ: bad ... |
2736 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
caaa5f9f0 [PATCH] cfq-iosch... |
2737 |
|
ff6657c6c cfq-iosched: get ... |
2738 |
cfqq = cic->cfqq[BLK_RW_ASYNC]; |
caaa5f9f0 [PATCH] cfq-iosch... |
2739 2740 |
if (cfqq) { struct cfq_queue *new_cfqq; |
ff6657c6c cfq-iosched: get ... |
2741 2742 |
new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic->ioc, GFP_ATOMIC); |
caaa5f9f0 [PATCH] cfq-iosch... |
2743 |
if (new_cfqq) { |
ff6657c6c cfq-iosched: get ... |
2744 |
cic->cfqq[BLK_RW_ASYNC] = new_cfqq; |
caaa5f9f0 [PATCH] cfq-iosch... |
2745 2746 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
2747 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
2748 |
|
ff6657c6c cfq-iosched: get ... |
2749 |
cfqq = cic->cfqq[BLK_RW_SYNC]; |
caaa5f9f0 [PATCH] cfq-iosch... |
2750 2751 |
if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
c1b707d25 [PATCH] CFQ: bad ... |
2752 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
2753 |
} |
fc46379da [PATCH] cfq-iosch... |
2754 |
static void cfq_ioc_set_ioprio(struct io_context *ioc) |
22e2c507c [PATCH] Update cf... |
2755 |
{ |
4ac845a2e block: cfq: make ... |
2756 |
call_for_each_cic(ioc, changed_ioprio); |
fc46379da [PATCH] cfq-iosch... |
2757 |
ioc->ioprio_changed = 0; |
22e2c507c [PATCH] Update cf... |
2758 |
} |
d5036d770 cfq-iosched: move... |
2759 |
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
a6151c3a5 cfq-iosched: appl... |
2760 |
pid_t pid, bool is_sync) |
d5036d770 cfq-iosched: move... |
2761 2762 2763 2764 |
{ RB_CLEAR_NODE(&cfqq->rb_node); RB_CLEAR_NODE(&cfqq->p_node); INIT_LIST_HEAD(&cfqq->fifo); |
30d7b9448 block cfq: don't ... |
2765 |
cfqq->ref = 0; |
d5036d770 cfq-iosched: move... |
2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 |
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... |
2777 2778 2779 2780 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED static void changed_cgroup(struct io_context *ioc, struct cfq_io_context *cic) { struct cfq_queue *sync_cfqq = cic_to_cfqq(cic, 1); |
bca4b914b cfq-iosched: remo... |
2781 |
struct cfq_data *cfqd = cic_to_cfqd(cic); |
24610333d blkio: Drop the r... |
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 |
unsigned long flags; struct request_queue *q; if (unlikely(!cfqd)) return; q = cfqd->queue; spin_lock_irqsave(q->queue_lock, flags); if (sync_cfqq) { /* * Drop reference to sync queue. A new sync queue will be * assigned in new group upon arrival of a fresh request. */ cfq_log_cfqq(cfqd, sync_cfqq, "changed cgroup"); cic_set_cfqq(cic, NULL, 1); cfq_put_queue(sync_cfqq); } spin_unlock_irqrestore(q->queue_lock, flags); } static void cfq_ioc_set_cgroup(struct io_context *ioc) { call_for_each_cic(ioc, changed_cgroup); ioc->cgroup_changed = 0; } #endif /* CONFIG_CFQ_GROUP_IOSCHED */ |
22e2c507c [PATCH] Update cf... |
2811 |
static struct cfq_queue * |
a6151c3a5 cfq-iosched: appl... |
2812 |
cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, |
fd0928df9 ioprio: move io p... |
2813 |
struct io_context *ioc, gfp_t gfp_mask) |
22e2c507c [PATCH] Update cf... |
2814 |
{ |
22e2c507c [PATCH] Update cf... |
2815 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
91fac317a cfq-iosched: get ... |
2816 |
struct cfq_io_context *cic; |
cdb16e8f7 blkio: Introduce ... |
2817 |
struct cfq_group *cfqg; |
22e2c507c [PATCH] Update cf... |
2818 2819 |
retry: |
3e59cf9d6 cfq-iosched: Get ... |
2820 |
cfqg = cfq_get_cfqg(cfqd); |
4ac845a2e block: cfq: make ... |
2821 |
cic = cfq_cic_lookup(cfqd, ioc); |
91fac317a cfq-iosched: get ... |
2822 2823 |
/* cic always exists here */ cfqq = cic_to_cfqq(cic, is_sync); |
22e2c507c [PATCH] Update cf... |
2824 |
|
6118b70b3 cfq-iosched: get ... |
2825 2826 2827 2828 2829 2830 |
/* * Always try a new alloc if we fell back to the OOM cfqq * originally, since it should just be a temporary situation. */ if (!cfqq || cfqq == &cfqd->oom_cfqq) { cfqq = NULL; |
22e2c507c [PATCH] Update cf... |
2831 2832 2833 2834 2835 |
if (new_cfqq) { cfqq = new_cfqq; new_cfqq = NULL; } else if (gfp_mask & __GFP_WAIT) { spin_unlock_irq(cfqd->queue->queue_lock); |
94f6030ca Slab allocators: ... |
2836 |
new_cfqq = kmem_cache_alloc_node(cfq_pool, |
6118b70b3 cfq-iosched: get ... |
2837 |
gfp_mask | __GFP_ZERO, |
94f6030ca Slab allocators: ... |
2838 |
cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
2839 |
spin_lock_irq(cfqd->queue->queue_lock); |
6118b70b3 cfq-iosched: get ... |
2840 2841 |
if (new_cfqq) goto retry; |
22e2c507c [PATCH] Update cf... |
2842 |
} else { |
94f6030ca Slab allocators: ... |
2843 2844 2845 |
cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask | __GFP_ZERO, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
2846 |
} |
6118b70b3 cfq-iosched: get ... |
2847 2848 2849 |
if (cfqq) { cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync); cfq_init_prio_data(cfqq, ioc); |
cdb16e8f7 blkio: Introduce ... |
2850 |
cfq_link_cfqq_cfqg(cfqq, cfqg); |
6118b70b3 cfq-iosched: get ... |
2851 2852 2853 |
cfq_log_cfqq(cfqd, cfqq, "alloced"); } else cfqq = &cfqd->oom_cfqq; |
22e2c507c [PATCH] Update cf... |
2854 2855 2856 2857 |
} if (new_cfqq) kmem_cache_free(cfq_pool, new_cfqq); |
22e2c507c [PATCH] Update cf... |
2858 2859 |
return cfqq; } |
c2dea2d1f cfq: async queue ... |
2860 2861 2862 |
static struct cfq_queue ** cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) { |
fe094d98e cfq-iosched: make... |
2863 |
switch (ioprio_class) { |
c2dea2d1f cfq: async queue ... |
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 |
case IOPRIO_CLASS_RT: return &cfqd->async_cfqq[0][ioprio]; case IOPRIO_CLASS_BE: return &cfqd->async_cfqq[1][ioprio]; case IOPRIO_CLASS_IDLE: return &cfqd->async_idle_cfqq; default: BUG(); } } |
15c31be4d cfq-iosched: fix ... |
2874 |
static struct cfq_queue * |
a6151c3a5 cfq-iosched: appl... |
2875 |
cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc, |
15c31be4d cfq-iosched: fix ... |
2876 2877 |
gfp_t gfp_mask) { |
fd0928df9 ioprio: move io p... |
2878 2879 |
const int ioprio = task_ioprio(ioc); const int ioprio_class = task_ioprio_class(ioc); |
c2dea2d1f cfq: async queue ... |
2880 |
struct cfq_queue **async_cfqq = NULL; |
15c31be4d cfq-iosched: fix ... |
2881 |
struct cfq_queue *cfqq = NULL; |
c2dea2d1f cfq: async queue ... |
2882 2883 2884 2885 |
if (!is_sync) { async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio); cfqq = *async_cfqq; } |
6118b70b3 cfq-iosched: get ... |
2886 |
if (!cfqq) |
fd0928df9 ioprio: move io p... |
2887 |
cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, gfp_mask); |
15c31be4d cfq-iosched: fix ... |
2888 2889 2890 2891 |
/* * pin the queue now that it's allocated, scheduler exit will prune it */ |
c2dea2d1f cfq: async queue ... |
2892 |
if (!is_sync && !(*async_cfqq)) { |
30d7b9448 block cfq: don't ... |
2893 |
cfqq->ref++; |
c2dea2d1f cfq: async queue ... |
2894 |
*async_cfqq = cfqq; |
15c31be4d cfq-iosched: fix ... |
2895 |
} |
30d7b9448 block cfq: don't ... |
2896 |
cfqq->ref++; |
15c31be4d cfq-iosched: fix ... |
2897 2898 |
return cfqq; } |
498d3aa2b [PATCH] cfq-iosch... |
2899 2900 2901 |
/* * We drop cfq io contexts lazily, so we may find a dead one. */ |
dbecf3ab4 [PATCH 2/2] cfq: ... |
2902 |
static void |
4ac845a2e block: cfq: make ... |
2903 2904 |
cfq_drop_dead_cic(struct cfq_data *cfqd, struct io_context *ioc, struct cfq_io_context *cic) |
dbecf3ab4 [PATCH 2/2] cfq: ... |
2905 |
{ |
4ac845a2e block: cfq: make ... |
2906 |
unsigned long flags; |
fc46379da [PATCH] cfq-iosch... |
2907 |
WARN_ON(!list_empty(&cic->queue_list)); |
bca4b914b cfq-iosched: remo... |
2908 |
BUG_ON(cic->key != cfqd_dead_key(cfqd)); |
597bc485d cfq-iosched: spee... |
2909 |
|
4ac845a2e block: cfq: make ... |
2910 |
spin_lock_irqsave(&ioc->lock, flags); |
4faa3c815 cfq-iosched: do n... |
2911 |
BUG_ON(ioc->ioc_data == cic); |
597bc485d cfq-iosched: spee... |
2912 |
|
80b15c738 cfq-iosched: comp... |
2913 |
radix_tree_delete(&ioc->radix_root, cfqd->cic_index); |
ffc4e7595 cfq-iosched: add ... |
2914 |
hlist_del_rcu(&cic->cic_list); |
4ac845a2e block: cfq: make ... |
2915 2916 2917 |
spin_unlock_irqrestore(&ioc->lock, flags); cfq_cic_free(cic); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
2918 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
2919 |
static struct cfq_io_context * |
4ac845a2e block: cfq: make ... |
2920 |
cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc) |
e2d74ac06 [PATCH] [BLOCK] c... |
2921 |
{ |
e2d74ac06 [PATCH] [BLOCK] c... |
2922 |
struct cfq_io_context *cic; |
d6de8be71 cfq-iosched: fix ... |
2923 |
unsigned long flags; |
e2d74ac06 [PATCH] [BLOCK] c... |
2924 |
|
91fac317a cfq-iosched: get ... |
2925 2926 |
if (unlikely(!ioc)) return NULL; |
d6de8be71 cfq-iosched: fix ... |
2927 |
rcu_read_lock(); |
597bc485d cfq-iosched: spee... |
2928 2929 2930 |
/* * we maintain a last-hit cache, to avoid browsing over the tree */ |
4ac845a2e block: cfq: make ... |
2931 |
cic = rcu_dereference(ioc->ioc_data); |
d6de8be71 cfq-iosched: fix ... |
2932 2933 |
if (cic && cic->key == cfqd) { rcu_read_unlock(); |
597bc485d cfq-iosched: spee... |
2934 |
return cic; |
d6de8be71 cfq-iosched: fix ... |
2935 |
} |
597bc485d cfq-iosched: spee... |
2936 |
|
4ac845a2e block: cfq: make ... |
2937 |
do { |
80b15c738 cfq-iosched: comp... |
2938 |
cic = radix_tree_lookup(&ioc->radix_root, cfqd->cic_index); |
4ac845a2e block: cfq: make ... |
2939 2940 2941 |
rcu_read_unlock(); if (!cic) break; |
bca4b914b cfq-iosched: remo... |
2942 |
if (unlikely(cic->key != cfqd)) { |
4ac845a2e block: cfq: make ... |
2943 |
cfq_drop_dead_cic(cfqd, ioc, cic); |
d6de8be71 cfq-iosched: fix ... |
2944 |
rcu_read_lock(); |
4ac845a2e block: cfq: make ... |
2945 |
continue; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
2946 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
2947 |
|
d6de8be71 cfq-iosched: fix ... |
2948 |
spin_lock_irqsave(&ioc->lock, flags); |
4ac845a2e block: cfq: make ... |
2949 |
rcu_assign_pointer(ioc->ioc_data, cic); |
d6de8be71 cfq-iosched: fix ... |
2950 |
spin_unlock_irqrestore(&ioc->lock, flags); |
4ac845a2e block: cfq: make ... |
2951 2952 |
break; } while (1); |
e2d74ac06 [PATCH] [BLOCK] c... |
2953 |
|
4ac845a2e block: cfq: make ... |
2954 |
return cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
2955 |
} |
4ac845a2e block: cfq: make ... |
2956 2957 2958 2959 2960 |
/* * Add cic into ioc, using cfqd as the search key. This enables us to lookup * the process specific cfq io context when entered from the block layer. * Also adds the cic to a per-cfqd list, used when this queue is removed. */ |
febffd618 cfq-iosched: kill... |
2961 2962 |
static int cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc, struct cfq_io_context *cic, gfp_t gfp_mask) |
e2d74ac06 [PATCH] [BLOCK] c... |
2963 |
{ |
0261d6886 [PATCH] CFQ: use ... |
2964 |
unsigned long flags; |
4ac845a2e block: cfq: make ... |
2965 |
int ret; |
e2d74ac06 [PATCH] [BLOCK] c... |
2966 |
|
4ac845a2e block: cfq: make ... |
2967 2968 2969 2970 |
ret = radix_tree_preload(gfp_mask); if (!ret) { cic->ioc = ioc; cic->key = cfqd; |
e2d74ac06 [PATCH] [BLOCK] c... |
2971 |
|
4ac845a2e block: cfq: make ... |
2972 2973 |
spin_lock_irqsave(&ioc->lock, flags); ret = radix_tree_insert(&ioc->radix_root, |
80b15c738 cfq-iosched: comp... |
2974 |
cfqd->cic_index, cic); |
ffc4e7595 cfq-iosched: add ... |
2975 2976 |
if (!ret) hlist_add_head_rcu(&cic->cic_list, &ioc->cic_list); |
4ac845a2e block: cfq: make ... |
2977 |
spin_unlock_irqrestore(&ioc->lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
2978 |
|
4ac845a2e block: cfq: make ... |
2979 2980 2981 2982 2983 2984 2985 |
radix_tree_preload_end(); if (!ret) { spin_lock_irqsave(cfqd->queue->queue_lock, flags); list_add(&cic->queue_list, &cfqd->cic_list); spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
e2d74ac06 [PATCH] [BLOCK] c... |
2986 |
} |
4ac845a2e block: cfq: make ... |
2987 2988 2989 |
if (ret) printk(KERN_ERR "cfq: cic link failed! "); |
fc46379da [PATCH] cfq-iosch... |
2990 |
|
4ac845a2e block: cfq: make ... |
2991 |
return ret; |
e2d74ac06 [PATCH] [BLOCK] c... |
2992 |
} |
1da177e4c Linux-2.6.12-rc2 |
2993 2994 2995 |
/* * Setup general io context and cfq io context. There can be several cfq * io contexts per general io context, if this process is doing io to more |
e2d74ac06 [PATCH] [BLOCK] c... |
2996 |
* than one device managed by cfq. |
1da177e4c Linux-2.6.12-rc2 |
2997 2998 |
*/ static struct cfq_io_context * |
e2d74ac06 [PATCH] [BLOCK] c... |
2999 |
cfq_get_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
3000 |
{ |
22e2c507c [PATCH] Update cf... |
3001 |
struct io_context *ioc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3002 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
3003 |
|
22e2c507c [PATCH] Update cf... |
3004 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
1da177e4c Linux-2.6.12-rc2 |
3005 |
|
b5deef901 [PATCH] Make sure... |
3006 |
ioc = get_io_context(gfp_mask, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
3007 3008 |
if (!ioc) return NULL; |
4ac845a2e block: cfq: make ... |
3009 |
cic = cfq_cic_lookup(cfqd, ioc); |
e2d74ac06 [PATCH] [BLOCK] c... |
3010 3011 |
if (cic) goto out; |
1da177e4c Linux-2.6.12-rc2 |
3012 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
3013 3014 3015 |
cic = cfq_alloc_io_context(cfqd, gfp_mask); if (cic == NULL) goto err; |
1da177e4c Linux-2.6.12-rc2 |
3016 |
|
4ac845a2e block: cfq: make ... |
3017 3018 |
if (cfq_cic_link(cfqd, ioc, cic, gfp_mask)) goto err_free; |
1da177e4c Linux-2.6.12-rc2 |
3019 |
out: |
fc46379da [PATCH] cfq-iosch... |
3020 3021 3022 |
smp_read_barrier_depends(); if (unlikely(ioc->ioprio_changed)) cfq_ioc_set_ioprio(ioc); |
24610333d blkio: Drop the r... |
3023 3024 3025 3026 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED if (unlikely(ioc->cgroup_changed)) cfq_ioc_set_cgroup(ioc); #endif |
1da177e4c Linux-2.6.12-rc2 |
3027 |
return cic; |
4ac845a2e block: cfq: make ... |
3028 3029 |
err_free: cfq_cic_free(cic); |
1da177e4c Linux-2.6.12-rc2 |
3030 3031 3032 3033 |
err: put_io_context(ioc); return NULL; } |
22e2c507c [PATCH] Update cf... |
3034 3035 |
static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic) |
1da177e4c Linux-2.6.12-rc2 |
3036 |
{ |
aaf1228dd cfq-iosched: remo... |
3037 3038 |
unsigned long elapsed = jiffies - cic->last_end_request; unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle); |
db3b5848e When cfq I/O sche... |
3039 |
|
22e2c507c [PATCH] Update cf... |
3040 3041 3042 3043 |
cic->ttime_samples = (7*cic->ttime_samples + 256) / 8; cic->ttime_total = (7*cic->ttime_total + 256*ttime) / 8; cic->ttime_mean = (cic->ttime_total + 128) / cic->ttime_samples; } |
1da177e4c Linux-2.6.12-rc2 |
3044 |
|
206dc69b3 [BLOCK] cfq-iosch... |
3045 |
static void |
b2c18e1e0 cfq: calculate th... |
3046 |
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_queue *cfqq, |
6d048f531 cfq-iosched: deve... |
3047 |
struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
3048 |
{ |
3dde36dde cfq-iosched: rewo... |
3049 |
sector_t sdist = 0; |
41647e7a9 cfq-iosched: reth... |
3050 |
sector_t n_sec = blk_rq_sectors(rq); |
3dde36dde cfq-iosched: rewo... |
3051 3052 3053 3054 3055 3056 |
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... |
3057 |
|
3dde36dde cfq-iosched: rewo... |
3058 |
cfqq->seek_history <<= 1; |
41647e7a9 cfq-iosched: reth... |
3059 3060 3061 3062 |
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... |
3063 |
} |
1da177e4c Linux-2.6.12-rc2 |
3064 |
|
22e2c507c [PATCH] Update cf... |
3065 3066 3067 3068 3069 3070 3071 3072 |
/* * 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, struct cfq_io_context *cic) { |
7b679138b cfq-iosched: add ... |
3073 |
int old_idle, enable_idle; |
1be92f2fc cfq-iosched: neve... |
3074 |
|
0871714e0 cfq-iosched: rela... |
3075 3076 3077 3078 |
/* * Don't idle for async or idle io prio class */ if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq)) |
1be92f2fc cfq-iosched: neve... |
3079 |
return; |
c265a7f41 cfq-iosched: get ... |
3080 |
enable_idle = old_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
3081 |
|
76280aff1 cfq-iosched: idli... |
3082 3083 |
if (cfqq->queued[0] + cfqq->queued[1] >= 4) cfq_mark_cfqq_deep(cfqq); |
749ef9f84 cfq: improve fsyn... |
3084 3085 3086 |
if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE)) enable_idle = 0; else if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle || |
3dde36dde cfq-iosched: rewo... |
3087 |
(!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) |
22e2c507c [PATCH] Update cf... |
3088 3089 |
enable_idle = 0; else if (sample_valid(cic->ttime_samples)) { |
718eee057 cfq-iosched: fair... |
3090 |
if (cic->ttime_mean > cfqd->cfq_slice_idle) |
22e2c507c [PATCH] Update cf... |
3091 3092 3093 |
enable_idle = 0; else enable_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
3094 |
} |
7b679138b cfq-iosched: add ... |
3095 3096 3097 3098 3099 3100 3101 |
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... |
3102 |
} |
1da177e4c Linux-2.6.12-rc2 |
3103 |
|
22e2c507c [PATCH] Update cf... |
3104 3105 3106 3107 |
/* * 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... |
3108 |
static bool |
22e2c507c [PATCH] Update cf... |
3109 |
cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
3110 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
3111 |
{ |
6d048f531 cfq-iosched: deve... |
3112 |
struct cfq_queue *cfqq; |
22e2c507c [PATCH] Update cf... |
3113 |
|
6d048f531 cfq-iosched: deve... |
3114 3115 |
cfqq = cfqd->active_queue; if (!cfqq) |
a6151c3a5 cfq-iosched: appl... |
3116 |
return false; |
22e2c507c [PATCH] Update cf... |
3117 |
|
6d048f531 cfq-iosched: deve... |
3118 |
if (cfq_class_idle(new_cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3119 |
return false; |
22e2c507c [PATCH] Update cf... |
3120 3121 |
if (cfq_class_idle(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3122 |
return true; |
1e3335de0 cfq-iosched: impr... |
3123 |
|
22e2c507c [PATCH] Update cf... |
3124 |
/* |
875feb63b cfq-iosched: Resp... |
3125 3126 3127 3128 3129 3130 |
* 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... |
3131 3132 3133 |
* if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
5e7053747 [PATCH] cfq-iosch... |
3134 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3135 |
return true; |
1e3335de0 cfq-iosched: impr... |
3136 |
|
8682e1f15 blkio: Provide so... |
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 |
if (new_cfqq->cfqg != cfqq->cfqg) return false; if (cfq_slice_used(cfqq)) return true; /* Allow preemption only if we are idling on sync-noidle tree */ if (cfqd->serving_type == SYNC_NOIDLE_WORKLOAD && cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD && new_cfqq->service_tree->count == 2 && RB_EMPTY_ROOT(&cfqq->sort_list)) return true; |
374f84ac3 [PATCH] cfq-iosch... |
3149 3150 3151 3152 |
/* * 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. */ |
7b6d91dae block: unify flag... |
3153 |
if ((rq->cmd_flags & REQ_META) && !cfqq->meta_pending) |
e6ec4fe24 cfq-iosched: fix ... |
3154 |
return true; |
22e2c507c [PATCH] Update cf... |
3155 |
|
3a9a3f6cc cfq-iosched: Allo... |
3156 3157 3158 3159 |
/* * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice. */ if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3160 |
return true; |
3a9a3f6cc cfq-iosched: Allo... |
3161 |
|
d2d59e18a cfq-iosched: sche... |
3162 3163 3164 |
/* 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... |
3165 |
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) |
a6151c3a5 cfq-iosched: appl... |
3166 |
return false; |
1e3335de0 cfq-iosched: impr... |
3167 3168 3169 3170 3171 |
/* * if this request is as-good as one we would expect from the * current cfqq, let it preempt */ |
e9ce335df cfq-iosched: fix ... |
3172 |
if (cfq_rq_close(cfqd, cfqq, rq)) |
a6151c3a5 cfq-iosched: appl... |
3173 |
return true; |
1e3335de0 cfq-iosched: impr... |
3174 |
|
a6151c3a5 cfq-iosched: appl... |
3175 |
return false; |
22e2c507c [PATCH] Update cf... |
3176 3177 3178 3179 3180 3181 3182 3183 |
} /* * 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) { |
f8ae6e3eb block cfq: make q... |
3184 |
struct cfq_queue *old_cfqq = cfqd->active_queue; |
7b679138b cfq-iosched: add ... |
3185 |
cfq_log_cfqq(cfqd, cfqq, "preempt"); |
e5ff082e8 blkio: Fix anothe... |
3186 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
3187 |
|
bf5722567 [PATCH] cfq-iosch... |
3188 |
/* |
f8ae6e3eb block cfq: make q... |
3189 3190 3191 3192 3193 3194 3195 |
* workload type is changed, don't save slice, otherwise preempt * doesn't happen */ if (cfqq_type(old_cfqq) != cfqq_type(cfqq)) cfqq->cfqg->saved_workload_slice = 0; /* |
bf5722567 [PATCH] cfq-iosch... |
3196 3197 3198 3199 |
* 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 ... |
3200 3201 |
cfq_service_tree_add(cfqd, cfqq, 1); |
eda5e0c91 cfq-iosched: Don'... |
3202 |
|
62a37f6ba cfq-iosched: Don'... |
3203 3204 |
cfqq->slice_end = 0; cfq_mark_cfqq_slice_new(cfqq); |
22e2c507c [PATCH] Update cf... |
3205 3206 3207 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
3208 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
3209 3210 3211 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
3212 3213 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
3214 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3215 |
struct cfq_io_context *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
3216 |
|
45333d5a3 cfq-iosched: fix ... |
3217 |
cfqd->rq_queued++; |
7b6d91dae block: unify flag... |
3218 |
if (rq->cmd_flags & REQ_META) |
374f84ac3 [PATCH] cfq-iosch... |
3219 |
cfqq->meta_pending++; |
9c2c38a12 [PATCH] cfq-iosch... |
3220 |
cfq_update_io_thinktime(cfqd, cic); |
b2c18e1e0 cfq: calculate th... |
3221 |
cfq_update_io_seektime(cfqd, cfqq, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
3222 |
cfq_update_idle_window(cfqd, cfqq, cic); |
b2c18e1e0 cfq: calculate th... |
3223 |
cfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq); |
22e2c507c [PATCH] Update cf... |
3224 3225 3226 |
if (cfqq == cfqd->active_queue) { /* |
b029195dd cfq-iosched: don'... |
3227 3228 3229 |
* 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'... |
3230 3231 |
* 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... |
3232 3233 3234 |
* 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... |
3235 |
*/ |
d6ceb25e8 cfq-iosched: don'... |
3236 |
if (cfq_cfqq_wait_request(cfqq)) { |
2d8707229 cfq-iosched: twea... |
3237 3238 |
if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE || cfqd->busy_queues > 1) { |
812df48d1 blkio: Add more d... |
3239 |
cfq_del_timer(cfqd, cfqq); |
554554f60 cfq: Remove wait_... |
3240 |
cfq_clear_cfqq_wait_request(cfqq); |
24ecfbe27 block: add blk_ru... |
3241 |
__blk_run_queue(cfqd->queue); |
a11cdaa7a block: Update to ... |
3242 |
} else { |
e98ef89b3 cfq-iosched: Fixe... |
3243 |
cfq_blkiocg_update_idle_time_stats( |
a11cdaa7a block: Update to ... |
3244 |
&cfqq->cfqg->blkg); |
bf7919371 blkio: Set must_d... |
3245 |
cfq_mark_cfqq_must_dispatch(cfqq); |
a11cdaa7a block: Update to ... |
3246 |
} |
d6ceb25e8 cfq-iosched: don'... |
3247 |
} |
5e7053747 [PATCH] cfq-iosch... |
3248 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
3249 3250 3251 |
/* * 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... |
3252 3253 |
* 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... |
3254 3255 |
*/ cfq_preempt_queue(cfqd, cfqq); |
24ecfbe27 block: add blk_ru... |
3256 |
__blk_run_queue(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
3257 |
} |
1da177e4c Linux-2.6.12-rc2 |
3258 |
} |
165125e1e [BLOCK] Get rid o... |
3259 |
static void cfq_insert_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3260 |
{ |
b4878f245 [PATCH] 02/05: up... |
3261 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
3262 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
3263 |
|
7b679138b cfq-iosched: add ... |
3264 |
cfq_log_cfqq(cfqd, cfqq, "insert_request"); |
fd0928df9 ioprio: move io p... |
3265 |
cfq_init_prio_data(cfqq, RQ_CIC(rq)->ioc); |
1da177e4c Linux-2.6.12-rc2 |
3266 |
|
30996f40b cfq-iosched: fix ... |
3267 |
rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]); |
22e2c507c [PATCH] Update cf... |
3268 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
aa6f6a3de cfq-iosched: prep... |
3269 |
cfq_add_rq_rb(rq); |
e98ef89b3 cfq-iosched: Fixe... |
3270 |
cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg, |
cdc1184cf blkio: Add io_que... |
3271 3272 |
&cfqd->serving_group->blkg, rq_data_dir(rq), rq_is_sync(rq)); |
5e7053747 [PATCH] cfq-iosch... |
3273 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
3274 |
} |
45333d5a3 cfq-iosched: fix ... |
3275 3276 3277 3278 3279 3280 |
/* * 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... |
3281 |
struct cfq_queue *cfqq = cfqd->active_queue; |
53c583d22 cfq-iosched: requ... |
3282 3283 |
if (cfqd->rq_in_driver > cfqd->hw_tag_est_depth) cfqd->hw_tag_est_depth = cfqd->rq_in_driver; |
e459dd08f cfq-iosched: fix ... |
3284 3285 3286 |
if (cfqd->hw_tag == 1) return; |
45333d5a3 cfq-iosched: fix ... |
3287 3288 |
if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN && |
53c583d22 cfq-iosched: requ... |
3289 |
cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3290 |
return; |
1a1238a7d cfq-iosched: impr... |
3291 3292 3293 3294 3295 3296 3297 |
/* * 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... |
3298 |
CFQ_HW_QUEUE_MIN && cfqd->rq_in_driver < CFQ_HW_QUEUE_MIN) |
1a1238a7d cfq-iosched: impr... |
3299 |
return; |
45333d5a3 cfq-iosched: fix ... |
3300 3301 |
if (cfqd->hw_tag_samples++ < 50) return; |
e459dd08f cfq-iosched: fix ... |
3302 |
if (cfqd->hw_tag_est_depth >= CFQ_HW_QUEUE_MIN) |
45333d5a3 cfq-iosched: fix ... |
3303 3304 3305 |
cfqd->hw_tag = 1; else cfqd->hw_tag = 0; |
45333d5a3 cfq-iosched: fix ... |
3306 |
} |
7667aa063 cfq-iosched: Take... |
3307 3308 3309 |
static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) { struct cfq_io_context *cic = cfqd->active_cic; |
02a8f01b5 cfq-iosched: Don'... |
3310 3311 3312 |
/* If the queue already has requests, don't wait */ if (!RB_EMPTY_ROOT(&cfqq->sort_list)) return false; |
7667aa063 cfq-iosched: Take... |
3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 |
/* If there are other queues in the group, don't wait */ if (cfqq->cfqg->nr_cfqq > 1) return false; if (cfq_slice_used(cfqq)) return true; /* if slice left is less than think time, wait busy */ if (cic && sample_valid(cic->ttime_samples) && (cfqq->slice_end - jiffies < cic->ttime_mean)) 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. */ if (cfqq->slice_end - jiffies == 1) return true; return false; } |
165125e1e [BLOCK] Get rid o... |
3337 |
static void cfq_completed_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3338 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3339 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
3340 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
3341 |
const int sync = rq_is_sync(rq); |
b4878f245 [PATCH] 02/05: up... |
3342 |
unsigned long now; |
1da177e4c Linux-2.6.12-rc2 |
3343 |
|
b4878f245 [PATCH] 02/05: up... |
3344 |
now = jiffies; |
33659ebba block: remove wra... |
3345 3346 |
cfq_log_cfqq(cfqd, cfqq, "complete rqnoidle %d", !!(rq->cmd_flags & REQ_NOIDLE)); |
1da177e4c Linux-2.6.12-rc2 |
3347 |
|
45333d5a3 cfq-iosched: fix ... |
3348 |
cfq_update_hw_tag(cfqd); |
53c583d22 cfq-iosched: requ... |
3349 |
WARN_ON(!cfqd->rq_in_driver); |
6d048f531 cfq-iosched: deve... |
3350 |
WARN_ON(!cfqq->dispatched); |
53c583d22 cfq-iosched: requ... |
3351 |
cfqd->rq_in_driver--; |
6d048f531 cfq-iosched: deve... |
3352 |
cfqq->dispatched--; |
80bdf0c78 cfq-iosched: Impl... |
3353 |
(RQ_CFQG(rq))->dispatched--; |
e98ef89b3 cfq-iosched: Fixe... |
3354 3355 3356 |
cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg, rq_start_time_ns(rq), rq_io_start_time_ns(rq), rq_data_dir(rq), rq_is_sync(rq)); |
1da177e4c Linux-2.6.12-rc2 |
3357 |
|
53c583d22 cfq-iosched: requ... |
3358 |
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--; |
3ed9a2965 cfq-iosched: impr... |
3359 |
|
365722bb9 cfq-iosched: dela... |
3360 |
if (sync) { |
5e7053747 [PATCH] cfq-iosch... |
3361 |
RQ_CIC(rq)->last_end_request = now; |
573412b29 cfq-iosched: redu... |
3362 3363 |
if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now)) cfqd->last_delayed_sync = now; |
365722bb9 cfq-iosched: dela... |
3364 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3365 3366 3367 3368 3369 3370 |
/* * 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 ... |
3371 |
const bool cfqq_empty = RB_EMPTY_ROOT(&cfqq->sort_list); |
44f7c1606 cfq-iosched: defe... |
3372 3373 3374 3375 |
if (cfq_cfqq_slice_new(cfqq)) { cfq_set_prio_slice(cfqd, cfqq); cfq_clear_cfqq_slice_new(cfqq); } |
f75edf2dc blkio: Wait for c... |
3376 3377 |
/* |
7667aa063 cfq-iosched: Take... |
3378 3379 |
* Should we wait for next request to come in before we expire * the queue. |
f75edf2dc blkio: Wait for c... |
3380 |
*/ |
7667aa063 cfq-iosched: Take... |
3381 |
if (cfq_should_wait_busy(cfqd, cfqq)) { |
80bdf0c78 cfq-iosched: Impl... |
3382 3383 3384 3385 |
unsigned long extend_sl = cfqd->cfq_slice_idle; if (!cfqd->cfq_slice_idle) extend_sl = cfqd->cfq_group_idle; cfqq->slice_end = jiffies + extend_sl; |
f75edf2dc blkio: Wait for c... |
3386 |
cfq_mark_cfqq_wait_busy(cfqq); |
b1ffe737f cfq-iosched: Add ... |
3387 |
cfq_log_cfqq(cfqd, cfqq, "will busy wait"); |
f75edf2dc blkio: Wait for c... |
3388 |
} |
a36e71f99 cfq-iosched: add ... |
3389 |
/* |
8e550632c cfq-iosched: fix ... |
3390 3391 3392 3393 3394 3395 |
* 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 ... |
3396 |
*/ |
0871714e0 cfq-iosched: rela... |
3397 |
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) |
e5ff082e8 blkio: Fix anothe... |
3398 |
cfq_slice_expired(cfqd, 1); |
8e550632c cfq-iosched: fix ... |
3399 3400 |
else if (sync && cfqq_empty && !cfq_close_cooperator(cfqd, cfqq)) { |
749ef9f84 cfq: improve fsyn... |
3401 |
cfq_arm_slice_timer(cfqd); |
8e550632c cfq-iosched: fix ... |
3402 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
3403 |
} |
6d048f531 cfq-iosched: deve... |
3404 |
|
53c583d22 cfq-iosched: requ... |
3405 |
if (!cfqd->rq_in_driver) |
23e018a1b block: get rid of... |
3406 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
3407 |
} |
22e2c507c [PATCH] Update cf... |
3408 3409 3410 3411 3412 |
/* * we temporarily boost lower priority queues if they are holding fs exclusive * resources. they are boosted to normal prio (CLASS_BE/4) */ static void cfq_prio_boost(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
3413 |
{ |
22e2c507c [PATCH] Update cf... |
3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 |
if (has_fs_excl()) { /* * boost idle prio on transactions that would lock out other * users of the filesystem */ if (cfq_class_idle(cfqq)) cfqq->ioprio_class = IOPRIO_CLASS_BE; if (cfqq->ioprio > IOPRIO_NORM) cfqq->ioprio = IOPRIO_NORM; } else { /* |
dddb74519 cfq-iosched: simp... |
3425 |
* unboost the queue (if needed) |
22e2c507c [PATCH] Update cf... |
3426 |
*/ |
dddb74519 cfq-iosched: simp... |
3427 3428 |
cfqq->ioprio_class = cfqq->org_ioprio_class; cfqq->ioprio = cfqq->org_ioprio; |
22e2c507c [PATCH] Update cf... |
3429 |
} |
22e2c507c [PATCH] Update cf... |
3430 |
} |
1da177e4c Linux-2.6.12-rc2 |
3431 |
|
89850f7ee [PATCH] cfq-iosch... |
3432 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
3433 |
{ |
1b379d8da cfq-iosched: get ... |
3434 |
if (cfq_cfqq_wait_request(cfqq) && !cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
3435 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
3436 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
3437 |
} |
1da177e4c Linux-2.6.12-rc2 |
3438 |
|
22e2c507c [PATCH] Update cf... |
3439 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
3440 |
} |
165125e1e [BLOCK] Get rid o... |
3441 |
static int cfq_may_queue(struct request_queue *q, int rw) |
22e2c507c [PATCH] Update cf... |
3442 3443 3444 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; |
91fac317a cfq-iosched: get ... |
3445 |
struct cfq_io_context *cic; |
22e2c507c [PATCH] Update cf... |
3446 3447 3448 3449 3450 3451 3452 3453 |
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 ... |
3454 |
cic = cfq_cic_lookup(cfqd, tsk->io_context); |
91fac317a cfq-iosched: get ... |
3455 3456 |
if (!cic) return ELV_MQUEUE_MAY; |
b0b78f81a cfq-iosched: use ... |
3457 |
cfqq = cic_to_cfqq(cic, rw_is_sync(rw)); |
22e2c507c [PATCH] Update cf... |
3458 |
if (cfqq) { |
fd0928df9 ioprio: move io p... |
3459 |
cfq_init_prio_data(cfqq, cic->ioc); |
22e2c507c [PATCH] Update cf... |
3460 |
cfq_prio_boost(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
3461 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
3462 3463 3464 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
3465 |
} |
1da177e4c Linux-2.6.12-rc2 |
3466 3467 3468 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
3469 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
3470 |
{ |
5e7053747 [PATCH] cfq-iosch... |
3471 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
3472 |
|
5e7053747 [PATCH] cfq-iosch... |
3473 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
3474 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
3475 |
|
22e2c507c [PATCH] Update cf... |
3476 3477 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
3478 |
|
5e7053747 [PATCH] cfq-iosch... |
3479 |
put_io_context(RQ_CIC(rq)->ioc); |
1da177e4c Linux-2.6.12-rc2 |
3480 |
|
c186794db block: share requ... |
3481 3482 |
rq->elevator_private[0] = NULL; rq->elevator_private[1] = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3483 |
|
7f1dc8a2d blkio: Fix blkio ... |
3484 3485 |
/* Put down rq reference on cfqg */ cfq_put_cfqg(RQ_CFQG(rq)); |
c186794db block: share requ... |
3486 |
rq->elevator_private[2] = NULL; |
7f1dc8a2d blkio: Fix blkio ... |
3487 |
|
1da177e4c Linux-2.6.12-rc2 |
3488 3489 3490 |
cfq_put_queue(cfqq); } } |
df5fe3e8e cfq: merge cooper... |
3491 3492 3493 3494 3495 3496 |
static struct cfq_queue * cfq_merge_cfqqs(struct cfq_data *cfqd, struct cfq_io_context *cic, 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... |
3497 |
cfq_mark_cfqq_coop(cfqq->new_cfqq); |
df5fe3e8e cfq: merge cooper... |
3498 3499 3500 |
cfq_put_queue(cfqq); return cic_to_cfqq(cic, 1); } |
e6c5bc737 cfq: break apart ... |
3501 3502 3503 3504 3505 3506 3507 3508 |
/* * 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 * split_cfqq(struct cfq_io_context *cic, struct cfq_queue *cfqq) { if (cfqq_process_refs(cfqq) == 1) { |
e6c5bc737 cfq: break apart ... |
3509 3510 |
cfqq->pid = current->pid; cfq_clear_cfqq_coop(cfqq); |
ae54abed6 cfq-iosched: spli... |
3511 |
cfq_clear_cfqq_split_coop(cfqq); |
e6c5bc737 cfq: break apart ... |
3512 3513 3514 3515 |
return cfqq; } cic_set_cfqq(cic, NULL, 1); |
d02a2c077 cfq-iosched: fix ... |
3516 3517 |
cfq_put_cooperator(cfqq); |
e6c5bc737 cfq: break apart ... |
3518 3519 3520 |
cfq_put_queue(cfqq); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
3521 |
/* |
22e2c507c [PATCH] Update cf... |
3522 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
3523 |
*/ |
22e2c507c [PATCH] Update cf... |
3524 |
static int |
165125e1e [BLOCK] Get rid o... |
3525 |
cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
3526 3527 3528 3529 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_io_context *cic; const int rw = rq_data_dir(rq); |
a6151c3a5 cfq-iosched: appl... |
3530 |
const bool is_sync = rq_is_sync(rq); |
22e2c507c [PATCH] Update cf... |
3531 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
3532 3533 3534 |
unsigned long flags; might_sleep_if(gfp_mask & __GFP_WAIT); |
e2d74ac06 [PATCH] [BLOCK] c... |
3535 |
cic = cfq_get_io_context(cfqd, gfp_mask); |
22e2c507c [PATCH] Update cf... |
3536 |
|
1da177e4c Linux-2.6.12-rc2 |
3537 |
spin_lock_irqsave(q->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
3538 3539 |
if (!cic) goto queue_fail; |
e6c5bc737 cfq: break apart ... |
3540 |
new_queue: |
91fac317a cfq-iosched: get ... |
3541 |
cfqq = cic_to_cfqq(cic, is_sync); |
32f2e807a cfq-iosched: rese... |
3542 |
if (!cfqq || cfqq == &cfqd->oom_cfqq) { |
fd0928df9 ioprio: move io p... |
3543 |
cfqq = cfq_get_queue(cfqd, is_sync, cic->ioc, gfp_mask); |
91fac317a cfq-iosched: get ... |
3544 |
cic_set_cfqq(cic, cfqq, is_sync); |
df5fe3e8e cfq: merge cooper... |
3545 3546 |
} else { /* |
e6c5bc737 cfq: break apart ... |
3547 3548 |
* If the queue was seeky for too long, break it apart. */ |
ae54abed6 cfq-iosched: spli... |
3549 |
if (cfq_cfqq_coop(cfqq) && cfq_cfqq_split_coop(cfqq)) { |
e6c5bc737 cfq: break apart ... |
3550 3551 3552 3553 3554 3555 3556 |
cfq_log_cfqq(cfqd, cfqq, "breaking apart cfqq"); cfqq = split_cfqq(cic, cfqq); if (!cfqq) goto new_queue; } /* |
df5fe3e8e cfq: merge cooper... |
3557 3558 3559 3560 3561 3562 3563 |
* 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 ... |
3564 |
} |
1da177e4c Linux-2.6.12-rc2 |
3565 3566 |
cfqq->allocated[rw]++; |
1da177e4c Linux-2.6.12-rc2 |
3567 |
|
6fae9c251 Merge commit 'v2.... |
3568 |
cfqq->ref++; |
c186794db block: share requ... |
3569 3570 3571 |
rq->elevator_private[0] = cic; rq->elevator_private[1] = cfqq; rq->elevator_private[2] = cfq_ref_get_cfqg(cfqq->cfqg); |
93803e014 cfq-iosched: fix ... |
3572 |
spin_unlock_irqrestore(q->queue_lock, flags); |
5e7053747 [PATCH] cfq-iosch... |
3573 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3574 |
|
22e2c507c [PATCH] Update cf... |
3575 3576 3577 |
queue_fail: if (cic) put_io_context(cic->ioc); |
89850f7ee [PATCH] cfq-iosch... |
3578 |
|
23e018a1b block: get rid of... |
3579 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
3580 |
spin_unlock_irqrestore(q->queue_lock, flags); |
7b679138b cfq-iosched: add ... |
3581 |
cfq_log(cfqd, "set_request fail"); |
1da177e4c Linux-2.6.12-rc2 |
3582 3583 |
return 1; } |
65f27f384 WorkStruct: Pass ... |
3584 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
3585 |
{ |
65f27f384 WorkStruct: Pass ... |
3586 |
struct cfq_data *cfqd = |
23e018a1b block: get rid of... |
3587 |
container_of(work, struct cfq_data, unplug_work); |
165125e1e [BLOCK] Get rid o... |
3588 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
3589 |
|
40bb54d19 cfq-iosched: no n... |
3590 |
spin_lock_irq(q->queue_lock); |
24ecfbe27 block: add blk_ru... |
3591 |
__blk_run_queue(cfqd->queue); |
40bb54d19 cfq-iosched: no n... |
3592 |
spin_unlock_irq(q->queue_lock); |
22e2c507c [PATCH] Update cf... |
3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 |
} /* * Timer running if the active_queue is currently idling inside its time slice */ static void cfq_idle_slice_timer(unsigned long data) { struct cfq_data *cfqd = (struct cfq_data *) data; struct cfq_queue *cfqq; unsigned long flags; |
3c6bd2f87 cfq-iosched: chec... |
3603 |
int timed_out = 1; |
22e2c507c [PATCH] Update cf... |
3604 |
|
7b679138b cfq-iosched: add ... |
3605 |
cfq_log(cfqd, "idle timer fired"); |
22e2c507c [PATCH] Update cf... |
3606 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
fe094d98e cfq-iosched: make... |
3607 3608 |
cfqq = cfqd->active_queue; if (cfqq) { |
3c6bd2f87 cfq-iosched: chec... |
3609 |
timed_out = 0; |
22e2c507c [PATCH] Update cf... |
3610 |
/* |
b029195dd cfq-iosched: don'... |
3611 3612 3613 3614 3615 3616 |
* We saw a request before the queue expired, let it through */ if (cfq_cfqq_must_dispatch(cfqq)) goto out_kick; /* |
22e2c507c [PATCH] Update cf... |
3617 3618 |
* expired */ |
44f7c1606 cfq-iosched: defe... |
3619 |
if (cfq_slice_used(cfqq)) |
22e2c507c [PATCH] Update cf... |
3620 3621 3622 3623 3624 3625 |
goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
3626 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
3627 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
3628 3629 3630 3631 |
/* * not expired and it has a request pending, let it dispatch */ |
75e50984f cfq-iosched: kill... |
3632 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
3633 |
goto out_kick; |
76280aff1 cfq-iosched: idli... |
3634 3635 3636 3637 3638 |
/* * Queue depth flag is reset only when the idle didn't succeed */ cfq_clear_cfqq_deep(cfqq); |
22e2c507c [PATCH] Update cf... |
3639 3640 |
} expire: |
e5ff082e8 blkio: Fix anothe... |
3641 |
cfq_slice_expired(cfqd, timed_out); |
22e2c507c [PATCH] Update cf... |
3642 |
out_kick: |
23e018a1b block: get rid of... |
3643 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
3644 3645 3646 |
out_cont: spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
3b18152c3 [PATCH] CFQ io sc... |
3647 3648 3649 |
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) { del_timer_sync(&cfqd->idle_slice_timer); |
23e018a1b block: get rid of... |
3650 |
cancel_work_sync(&cfqd->unplug_work); |
3b18152c3 [PATCH] CFQ io sc... |
3651 |
} |
22e2c507c [PATCH] Update cf... |
3652 |
|
c2dea2d1f cfq: async queue ... |
3653 3654 3655 3656 3657 3658 3659 3660 3661 |
static void cfq_put_async_queues(struct cfq_data *cfqd) { int i; for (i = 0; i < IOPRIO_BE_NR; i++) { if (cfqd->async_cfqq[0][i]) cfq_put_queue(cfqd->async_cfqq[0][i]); if (cfqd->async_cfqq[1][i]) cfq_put_queue(cfqd->async_cfqq[1][i]); |
c2dea2d1f cfq: async queue ... |
3662 |
} |
2389d1ef1 cfq: fix IOPRIO_C... |
3663 3664 3665 |
if (cfqd->async_idle_cfqq) cfq_put_queue(cfqd->async_idle_cfqq); |
c2dea2d1f cfq: async queue ... |
3666 |
} |
b374d18a4 block: get rid of... |
3667 |
static void cfq_exit_queue(struct elevator_queue *e) |
1da177e4c Linux-2.6.12-rc2 |
3668 |
{ |
22e2c507c [PATCH] Update cf... |
3669 |
struct cfq_data *cfqd = e->elevator_data; |
165125e1e [BLOCK] Get rid o... |
3670 |
struct request_queue *q = cfqd->queue; |
56edf7d75 cfq-iosched: Fix ... |
3671 |
bool wait = false; |
22e2c507c [PATCH] Update cf... |
3672 |
|
3b18152c3 [PATCH] CFQ io sc... |
3673 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
3674 |
|
d9ff41879 [PATCH] make cfq_... |
3675 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
3676 |
|
d9ff41879 [PATCH] make cfq_... |
3677 |
if (cfqd->active_queue) |
e5ff082e8 blkio: Fix anothe... |
3678 |
__cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
3679 3680 |
while (!list_empty(&cfqd->cic_list)) { |
d9ff41879 [PATCH] make cfq_... |
3681 3682 3683 |
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next, struct cfq_io_context, queue_list); |
89850f7ee [PATCH] cfq-iosch... |
3684 3685 |
__cfq_exit_single_io_context(cfqd, cic); |
d9ff41879 [PATCH] make cfq_... |
3686 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
3687 |
|
c2dea2d1f cfq: async queue ... |
3688 |
cfq_put_async_queues(cfqd); |
b1c357696 blkio: Take care ... |
3689 |
cfq_release_cfq_groups(cfqd); |
56edf7d75 cfq-iosched: Fix ... |
3690 3691 3692 3693 3694 3695 3696 |
/* * If there are groups which we could not unlink from blkcg list, * wait for a rcu period for them to be freed. */ if (cfqd->nr_blkcg_linked_grps) wait = true; |
15c31be4d cfq-iosched: fix ... |
3697 |
|
d9ff41879 [PATCH] make cfq_... |
3698 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
3699 3700 |
cfq_shutdown_timer_wq(cfqd); |
80b15c738 cfq-iosched: comp... |
3701 3702 3703 |
spin_lock(&cic_index_lock); ida_remove(&cic_index_ida, cfqd->cic_index); spin_unlock(&cic_index_lock); |
56edf7d75 cfq-iosched: Fix ... |
3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 |
/* * Wait for cfqg->blkg->key accessors to exit their grace periods. * Do this wait only if there are other unlinked groups out * there. This can happen if cgroup deletion path claimed the * responsibility of cleaning up a group before queue cleanup code * get to the group. * * Do not call synchronize_rcu() unconditionally as there are drivers * which create/delete request queue hundreds of times during scan/boot * and synchronize_rcu() can take significant time and slow down boot. */ if (wait) synchronize_rcu(); |
2abae55f5 cfq-iosched: Fix ... |
3717 3718 3719 3720 3721 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED /* Free up per cpu stats for root group */ free_percpu(cfqd->root_group.blkg.stats_cpu); #endif |
56edf7d75 cfq-iosched: Fix ... |
3722 |
kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
3723 |
} |
80b15c738 cfq-iosched: comp... |
3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 |
static int cfq_alloc_cic_index(void) { int index, error; do { if (!ida_pre_get(&cic_index_ida, GFP_KERNEL)) return -ENOMEM; spin_lock(&cic_index_lock); error = ida_get_new(&cic_index_ida, &index); spin_unlock(&cic_index_lock); if (error && error != -EAGAIN) return error; } while (error); return index; } |
165125e1e [BLOCK] Get rid o... |
3741 |
static void *cfq_init_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
3742 3743 |
{ struct cfq_data *cfqd; |
718eee057 cfq-iosched: fair... |
3744 |
int i, j; |
cdb16e8f7 blkio: Introduce ... |
3745 |
struct cfq_group *cfqg; |
615f0259e blkio: Implement ... |
3746 |
struct cfq_rb_root *st; |
1da177e4c Linux-2.6.12-rc2 |
3747 |
|
80b15c738 cfq-iosched: comp... |
3748 3749 3750 |
i = cfq_alloc_cic_index(); if (i < 0) return NULL; |
94f6030ca Slab allocators: ... |
3751 |
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node); |
1547010e6 cfq-iosched: free... |
3752 3753 3754 3755 |
if (!cfqd) { spin_lock(&cic_index_lock); ida_remove(&cic_index_ida, i); spin_unlock(&cic_index_lock); |
bc1c11697 [PATCH] elevator ... |
3756 |
return NULL; |
1547010e6 cfq-iosched: free... |
3757 |
} |
1da177e4c Linux-2.6.12-rc2 |
3758 |
|
30d7b9448 block cfq: don't ... |
3759 3760 3761 3762 |
/* * Don't need take queue_lock in the routine, since we are * initializing the ioscheduler, and nobody is using cfqd */ |
80b15c738 cfq-iosched: comp... |
3763 |
cfqd->cic_index = i; |
1fa8f6d68 blkio: Introduce ... |
3764 3765 |
/* Init root service tree */ cfqd->grp_service_tree = CFQ_RB_ROOT; |
cdb16e8f7 blkio: Introduce ... |
3766 3767 |
/* Init root group */ cfqg = &cfqd->root_group; |
615f0259e blkio: Implement ... |
3768 3769 |
for_each_cfqg_st(cfqg, i, j, st) *st = CFQ_RB_ROOT; |
1fa8f6d68 blkio: Introduce ... |
3770 |
RB_CLEAR_NODE(&cfqg->rb_node); |
26a2ac009 cfq-iosched: clea... |
3771 |
|
25bc6b077 blkio: Introduce ... |
3772 3773 |
/* Give preference to root group over other groups */ cfqg->weight = 2*BLKIO_WEIGHT_DEFAULT; |
25fb5169d blkio: Dynamic cf... |
3774 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED |
b1c357696 blkio: Take care ... |
3775 |
/* |
56edf7d75 cfq-iosched: Fix ... |
3776 3777 3778 3779 3780 |
* Set root group reference to 2. One reference will be dropped when * all groups on cfqd->cfqg_list are being deleted during queue exit. * Other reference will remain there as we don't want to delete this * group as it is statically allocated and gets destroyed when * throtl_data goes away. |
b1c357696 blkio: Take care ... |
3781 |
*/ |
56edf7d75 cfq-iosched: Fix ... |
3782 |
cfqg->ref = 2; |
5624a4e44 blk-throttle: Mak... |
3783 3784 3785 3786 3787 3788 |
if (blkio_alloc_blkg_stats(&cfqg->blkg)) { kfree(cfqg); kfree(cfqd); return NULL; } |
dcf097b24 blk-cgroup: Fix R... |
3789 |
rcu_read_lock(); |
5624a4e44 blk-throttle: Mak... |
3790 |
|
e98ef89b3 cfq-iosched: Fixe... |
3791 3792 |
cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd, 0); |
dcf097b24 blk-cgroup: Fix R... |
3793 |
rcu_read_unlock(); |
56edf7d75 cfq-iosched: Fix ... |
3794 3795 3796 3797 |
cfqd->nr_blkcg_linked_grps++; /* Add group on cfqd->cfqg_list */ hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); |
25fb5169d blkio: Dynamic cf... |
3798 |
#endif |
26a2ac009 cfq-iosched: clea... |
3799 3800 3801 3802 3803 3804 3805 |
/* * 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 ... |
3806 3807 3808 3809 3810 3811 |
/* * Our fallback cfqq if cfq_find_alloc_queue() runs into OOM issues. * Grab a permanent reference to it, so that the normal code flow * will not attempt to free it. */ cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0); |
30d7b9448 block cfq: don't ... |
3812 |
cfqd->oom_cfqq.ref++; |
cdb16e8f7 blkio: Introduce ... |
3813 |
cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, &cfqd->root_group); |
6118b70b3 cfq-iosched: get ... |
3814 |
|
d9ff41879 [PATCH] make cfq_... |
3815 |
INIT_LIST_HEAD(&cfqd->cic_list); |
1da177e4c Linux-2.6.12-rc2 |
3816 |
|
1da177e4c Linux-2.6.12-rc2 |
3817 |
cfqd->queue = q; |
1da177e4c Linux-2.6.12-rc2 |
3818 |
|
22e2c507c [PATCH] Update cf... |
3819 3820 3821 |
init_timer(&cfqd->idle_slice_timer); cfqd->idle_slice_timer.function = cfq_idle_slice_timer; cfqd->idle_slice_timer.data = (unsigned long) cfqd; |
23e018a1b block: get rid of... |
3822 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
3823 |
|
1da177e4c Linux-2.6.12-rc2 |
3824 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
3825 3826 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
3827 3828 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
3829 3830 3831 3832 |
cfqd->cfq_slice[0] = cfq_slice_async; cfqd->cfq_slice[1] = cfq_slice_sync; cfqd->cfq_slice_async_rq = cfq_slice_async_rq; cfqd->cfq_slice_idle = cfq_slice_idle; |
80bdf0c78 cfq-iosched: Impl... |
3833 |
cfqd->cfq_group_idle = cfq_group_idle; |
963b72fc6 cfq-iosched: rena... |
3834 |
cfqd->cfq_latency = 1; |
e459dd08f cfq-iosched: fix ... |
3835 |
cfqd->hw_tag = -1; |
edc71131c cfq-iosched: comm... |
3836 3837 3838 3839 |
/* * we optimistically start assuming sync ops weren't delayed in last * second, in order to have larger depth for async operations. */ |
573412b29 cfq-iosched: redu... |
3840 |
cfqd->last_delayed_sync = jiffies - HZ; |
bc1c11697 [PATCH] elevator ... |
3841 |
return cfqd; |
1da177e4c Linux-2.6.12-rc2 |
3842 3843 3844 3845 |
} static void cfq_slab_kill(void) { |
d6de8be71 cfq-iosched: fix ... |
3846 3847 3848 3849 |
/* * Caller already ensured that pending RCU callbacks are completed, * so we should have no busy allocations at this point. */ |
1da177e4c Linux-2.6.12-rc2 |
3850 3851 3852 3853 3854 3855 3856 3857 |
if (cfq_pool) kmem_cache_destroy(cfq_pool); if (cfq_ioc_pool) kmem_cache_destroy(cfq_ioc_pool); } static int __init cfq_slab_setup(void) { |
0a31bd5f2 KMEM_CACHE(): sim... |
3858 |
cfq_pool = KMEM_CACHE(cfq_queue, 0); |
1da177e4c Linux-2.6.12-rc2 |
3859 3860 |
if (!cfq_pool) goto fail; |
34e6bbf23 cfq-iosched: fix ... |
3861 |
cfq_ioc_pool = KMEM_CACHE(cfq_io_context, 0); |
1da177e4c Linux-2.6.12-rc2 |
3862 3863 3864 3865 3866 3867 3868 3869 |
if (!cfq_ioc_pool) goto fail; return 0; fail: cfq_slab_kill(); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
3870 3871 3872 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 |
static ssize_t cfq_var_show(unsigned int var, char *page) { return sprintf(page, "%d ", var); } 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 |
3888 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
b374d18a4 block: get rid of... |
3889 |
static ssize_t __FUNC(struct elevator_queue *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
3890 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
3891 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
3892 3893 3894 3895 3896 3897 |
unsigned int __data = __VAR; \ if (__CONV) \ __data = jiffies_to_msecs(__data); \ return cfq_var_show(__data, (page)); \ } SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
22e2c507c [PATCH] Update cf... |
3898 3899 |
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... |
3900 3901 |
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... |
3902 |
SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); |
80bdf0c78 cfq-iosched: Impl... |
3903 |
SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1); |
22e2c507c [PATCH] Update cf... |
3904 3905 3906 |
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... |
3907 |
SHOW_FUNCTION(cfq_low_latency_show, cfqd->cfq_latency, 0); |
1da177e4c Linux-2.6.12-rc2 |
3908 3909 3910 |
#undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
b374d18a4 block: get rid of... |
3911 |
static ssize_t __FUNC(struct elevator_queue *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
3912 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
3913 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 |
unsigned int __data; \ int ret = cfq_var_store(&__data, (page), count); \ if (__data < (MIN)) \ __data = (MIN); \ else if (__data > (MAX)) \ __data = (MAX); \ if (__CONV) \ *(__PTR) = msecs_to_jiffies(__data); \ else \ *(__PTR) = __data; \ return ret; \ } STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
3927 3928 3929 3930 |
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... |
3931 |
STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); |
fe094d98e cfq-iosched: make... |
3932 3933 |
STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
3934 |
STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); |
80bdf0c78 cfq-iosched: Impl... |
3935 |
STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1); |
22e2c507c [PATCH] Update cf... |
3936 3937 |
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... |
3938 3939 |
STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, UINT_MAX, 0); |
963b72fc6 cfq-iosched: rena... |
3940 |
STORE_FUNCTION(cfq_low_latency_store, &cfqd->cfq_latency, 0, 1, 0); |
1da177e4c Linux-2.6.12-rc2 |
3941 |
#undef STORE_FUNCTION |
e572ec7e4 [PATCH] fix rmmod... |
3942 3943 3944 3945 3946 |
#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... |
3947 3948 3949 3950 3951 3952 3953 3954 |
CFQ_ATTR(fifo_expire_sync), CFQ_ATTR(fifo_expire_async), CFQ_ATTR(back_seek_max), CFQ_ATTR(back_seek_penalty), CFQ_ATTR(slice_sync), CFQ_ATTR(slice_async), CFQ_ATTR(slice_async_rq), CFQ_ATTR(slice_idle), |
80bdf0c78 cfq-iosched: Impl... |
3955 |
CFQ_ATTR(group_idle), |
963b72fc6 cfq-iosched: rena... |
3956 |
CFQ_ATTR(low_latency), |
e572ec7e4 [PATCH] fix rmmod... |
3957 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
3958 |
}; |
1da177e4c Linux-2.6.12-rc2 |
3959 3960 3961 3962 3963 |
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, |
da7752650 [PATCH] cfq-iosch... |
3964 |
.elevator_allow_merge_fn = cfq_allow_merge, |
812d40264 blkio: Add io_mer... |
3965 |
.elevator_bio_merged_fn = cfq_bio_merged, |
b4878f245 [PATCH] 02/05: up... |
3966 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
3967 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
3968 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
3969 |
.elevator_deactivate_req_fn = cfq_deactivate_request, |
1da177e4c Linux-2.6.12-rc2 |
3970 |
.elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
3971 3972 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
1da177e4c Linux-2.6.12-rc2 |
3973 3974 3975 3976 3977 |
.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, |
fc46379da [PATCH] cfq-iosch... |
3978 |
.trim = cfq_free_io_context, |
1da177e4c Linux-2.6.12-rc2 |
3979 |
}, |
3d1ab40f4 [PATCH] elevator_... |
3980 |
.elevator_attrs = cfq_attrs, |
1da177e4c Linux-2.6.12-rc2 |
3981 3982 3983 |
.elevator_name = "cfq", .elevator_owner = THIS_MODULE, }; |
3e2520668 blkio: Implement ... |
3984 3985 3986 3987 3988 3989 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED static struct blkio_policy_type blkio_policy_cfq = { .ops = { .blkio_unlink_group_fn = cfq_unlink_blkio_group, .blkio_update_group_weight_fn = cfq_update_blkio_group_weight, }, |
062a644d6 blk-cgroup: Prepa... |
3990 |
.plid = BLKIO_POLICY_PROP, |
3e2520668 blkio: Implement ... |
3991 3992 3993 3994 |
}; #else static struct blkio_policy_type blkio_policy_cfq; #endif |
1da177e4c Linux-2.6.12-rc2 |
3995 3996 |
static int __init cfq_init(void) { |
22e2c507c [PATCH] Update cf... |
3997 3998 3999 4000 4001 4002 4003 |
/* * could be 0 on HZ < 1000 setups */ if (!cfq_slice_async) cfq_slice_async = 1; if (!cfq_slice_idle) cfq_slice_idle = 1; |
80bdf0c78 cfq-iosched: Impl... |
4004 4005 4006 4007 4008 4009 |
#ifdef CONFIG_CFQ_GROUP_IOSCHED if (!cfq_group_idle) cfq_group_idle = 1; #else cfq_group_idle = 0; #endif |
1da177e4c Linux-2.6.12-rc2 |
4010 4011 |
if (cfq_slab_setup()) return -ENOMEM; |
2fdd82bd8 block: let elv_re... |
4012 |
elv_register(&iosched_cfq); |
3e2520668 blkio: Implement ... |
4013 |
blkio_policy_register(&blkio_policy_cfq); |
1da177e4c Linux-2.6.12-rc2 |
4014 |
|
2fdd82bd8 block: let elv_re... |
4015 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
4016 4017 4018 4019 |
} static void __exit cfq_exit(void) { |
6e9a4738c [PATCH] completio... |
4020 |
DECLARE_COMPLETION_ONSTACK(all_gone); |
3e2520668 blkio: Implement ... |
4021 |
blkio_policy_unregister(&blkio_policy_cfq); |
1da177e4c Linux-2.6.12-rc2 |
4022 |
elv_unregister(&iosched_cfq); |
334e94de9 [PATCH] deal with... |
4023 |
ioc_gone = &all_gone; |
fba822722 [PATCH 1/2] iosch... |
4024 4025 |
/* ioc_gone's update must be visible before reading ioc_count */ smp_wmb(); |
d6de8be71 cfq-iosched: fix ... |
4026 4027 4028 4029 4030 |
/* * this also protects us from entering cfq_slab_kill() with * pending RCU callbacks */ |
245b2e70e percpu: clean up ... |
4031 |
if (elv_ioc_count_read(cfq_ioc_count)) |
9a11b4ed0 cfq-iosched: prop... |
4032 |
wait_for_completion(&all_gone); |
80b15c738 cfq-iosched: comp... |
4033 |
ida_destroy(&cic_index_ida); |
83521d3eb [PATCH] cfq-iosch... |
4034 |
cfq_slab_kill(); |
1da177e4c Linux-2.6.12-rc2 |
4035 4036 4037 4038 4039 4040 4041 4042 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |