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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/blkdev.h> #include <linux/elevator.h> |
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#include <linux/hash.h> #include <linux/rbtree.h> |
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#include <linux/ioprio.h> |
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/* * tunables */ |
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static const int cfq_quantum = 4; /* max queue in one round of service */ |
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static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; static const int cfq_back_max = 16 * 1024; /* maximum backwards seek, in KiB */ static const int cfq_back_penalty = 2; /* penalty of a backwards seek */ |
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|
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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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#define CFQ_IDLE_GRACE (HZ / 10) #define CFQ_SLICE_SCALE (5) #define CFQ_KEY_ASYNC (0) |
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|
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/* * for the hash of cfqq inside the cfqd */ #define CFQ_QHASH_SHIFT 6 #define CFQ_QHASH_ENTRIES (1 << CFQ_QHASH_SHIFT) #define list_entry_qhash(entry) hlist_entry((entry), struct cfq_queue, cfq_hash) |
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#define list_entry_cfqq(ptr) list_entry((ptr), struct cfq_queue, cfq_list) |
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#define RQ_CIC(rq) ((struct cfq_io_context*)(rq)->elevator_private) #define RQ_CFQQ(rq) ((rq)->elevator_private2) |
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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, ioc_count); |
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static struct completion *ioc_gone; |
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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 ASYNC (0) #define SYNC (1) #define cfq_cfqq_dispatched(cfqq) \ ((cfqq)->on_dispatch[ASYNC] + (cfqq)->on_dispatch[SYNC]) #define cfq_cfqq_class_sync(cfqq) ((cfqq)->key != CFQ_KEY_ASYNC) #define cfq_cfqq_sync(cfqq) \ (cfq_cfqq_class_sync(cfqq) || (cfqq)->on_dispatch[SYNC]) |
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|
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#define sample_valid(samples) ((samples) > 80) |
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/* * Per block device queue structure */ |
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struct cfq_data { |
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request_queue_t *queue; /* * rr list of queues with requests and the count of them */ struct list_head rr_list[CFQ_PRIO_LISTS]; struct list_head busy_rr; struct list_head cur_rr; struct list_head idle_rr; unsigned int busy_queues; /* |
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* cfqq lookup hash */ |
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struct hlist_head *cfq_hash; |
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|
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int rq_in_driver; |
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int hw_tag; |
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|
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/* |
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* idle window management */ struct timer_list idle_slice_timer; struct work_struct unplug_work; |
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|
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struct cfq_queue *active_queue; struct cfq_io_context *active_cic; int cur_prio, cur_end_prio; unsigned int dispatch_slice; struct timer_list idle_class_timer; |
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sector_t last_sector; |
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unsigned long last_end_request; |
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|
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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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struct list_head cic_list; |
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}; |
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/* * Per process-grouping structure */ |
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struct cfq_queue { /* reference count */ atomic_t ref; /* parent cfq_data */ struct cfq_data *cfqd; |
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/* cfqq lookup hash */ |
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struct hlist_node cfq_hash; /* hash key */ |
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unsigned int key; |
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/* member of the rr/busy/cur/idle cfqd list */ |
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struct list_head cfq_list; /* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ |
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struct request *next_rq; |
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/* requests queued in sort_list */ int queued[2]; /* currently allocated requests */ int allocated[2]; |
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/* pending metadata requests */ int meta_pending; |
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/* fifo list of requests in sort_list */ |
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struct list_head fifo; |
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|
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unsigned long slice_start; unsigned long slice_end; unsigned long slice_left; |
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|
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/* number of requests that are on the dispatch list */ int on_dispatch[2]; |
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/* io prio of this group */ unsigned short ioprio, org_ioprio; unsigned short ioprio_class, org_ioprio_class; |
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/* various state flags, see below */ unsigned int flags; |
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}; |
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enum cfqq_state_flags { CFQ_CFQQ_FLAG_on_rr = 0, CFQ_CFQQ_FLAG_wait_request, CFQ_CFQQ_FLAG_must_alloc, CFQ_CFQQ_FLAG_must_alloc_slice, CFQ_CFQQ_FLAG_must_dispatch, CFQ_CFQQ_FLAG_fifo_expire, CFQ_CFQQ_FLAG_idle_window, CFQ_CFQQ_FLAG_prio_changed, |
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CFQ_CFQQ_FLAG_queue_new, |
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}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ cfqq->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ } \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ cfqq->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ } \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ return (cfqq->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ } CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); CFQ_CFQQ_FNS(must_alloc); CFQ_CFQQ_FNS(must_alloc_slice); CFQ_CFQQ_FNS(must_dispatch); CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
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CFQ_CFQQ_FNS(queue_new); |
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#undef CFQ_CFQQ_FNS |
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static struct cfq_queue *cfq_find_cfq_hash(struct cfq_data *, unsigned int, unsigned short); |
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static void cfq_dispatch_insert(request_queue_t *, struct request *); |
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static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, unsigned int key, struct task_struct *tsk, gfp_t gfp_mask); |
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/* |
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* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) { |
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if (cfqd->busy_queues) |
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kblockd_schedule_work(&cfqd->unplug_work); } static int cfq_queue_empty(request_queue_t *q) { struct cfq_data *cfqd = q->elevator->elevator_data; |
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return !cfqd->busy_queues; |
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} |
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static inline pid_t cfq_queue_pid(struct task_struct *task, int rw, int is_sync) |
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{ |
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/* * Use the per-process queue, for read requests and syncronous writes */ if (!(rw & REQ_RW) || is_sync) |
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return task->pid; return CFQ_KEY_ASYNC; } |
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/* |
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* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
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* We choose the request that is closest to the head right now. Distance |
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* behind the head is penalized and only allowed to a certain extent. |
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*/ |
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static struct request * cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2) |
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{ sector_t last, s1, s2, d1 = 0, d2 = 0; |
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unsigned long back_max; |
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#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? */ |
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if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
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if (rq_is_sync(rq1) && !rq_is_sync(rq2)) return rq1; else if (rq_is_sync(rq2) && !rq_is_sync(rq1)) return rq2; |
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if (rq_is_meta(rq1) && !rq_is_meta(rq2)) return rq1; else if (rq_is_meta(rq2) && !rq_is_meta(rq1)) return rq2; |
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s1 = rq1->sector; s2 = rq2->sector; |
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last = cfqd->last_sector; |
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/* * 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 |
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wrap |= CFQ_RQ1_WRAP; |
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if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
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wrap |= CFQ_RQ2_WRAP; |
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/* Found required data */ |
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/* * By doing switch() on the bit mask "wrap" we avoid having to * check two variables for all permutations: --> faster! */ switch (wrap) { |
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case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
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if (d1 < d2) |
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return rq1; |
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else if (d2 < d1) |
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return rq2; |
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else { if (s1 >= s2) |
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return rq1; |
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else |
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return rq2; |
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} |
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|
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case CFQ_RQ2_WRAP: |
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return rq1; |
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case CFQ_RQ1_WRAP: |
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return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
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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) |
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return rq1; |
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else |
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return rq2; |
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} } /* * would be nice to take fifo expire time into account as well */ |
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static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
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{ |
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struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
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struct request *next = NULL, *prev = NULL; |
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|
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BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
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if (rbprev) |
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prev = rb_entry_rq(rbprev); |
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|
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if (rbnext) |
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next = rb_entry_rq(rbnext); |
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else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
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next = rb_entry_rq(rbnext); |
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} |
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return cfq_choose_req(cfqd, next, prev); |
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} |
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static void cfq_resort_rr_list(struct cfq_queue *cfqq, int preempted) |
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{ |
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struct cfq_data *cfqd = cfqq->cfqd; |
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struct list_head *list; |
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|
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BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
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|
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list_del(&cfqq->cfq_list); |
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if (cfq_class_rt(cfqq)) list = &cfqd->cur_rr; else if (cfq_class_idle(cfqq)) list = &cfqd->idle_rr; else { /* * if cfqq has requests in flight, don't allow it to be * found in cfq_set_active_queue before it has finished them. * this is done to increase fairness between a process that * has lots of io pending vs one that only generates one * sporadically or synchronously */ |
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if (cfq_cfqq_dispatched(cfqq)) |
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list = &cfqd->busy_rr; else list = &cfqd->rr_list[cfqq->ioprio]; |
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} |
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/* |
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* If this queue was preempted or is new (never been serviced), let * it be added first for fairness but beind other new queues. * Otherwise, just add to the back of the list. |
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*/ |
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if (preempted || cfq_cfqq_queue_new(cfqq)) { struct list_head *n = list; struct cfq_queue *__cfqq; |
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while (n->next != list) { __cfqq = list_entry_cfqq(n->next); if (!cfq_cfqq_queue_new(__cfqq)) break; |
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n = n->next; } |
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list = n; |
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} |
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list_add_tail(&cfqq->cfq_list, list); |
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} /* * add to busy list of queues for service, trying to be fair in ordering |
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* the pending list according to last request service |
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*/ static inline void |
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cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
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{ |
3b18152c3 [PATCH] CFQ io sc... |
396 397 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
398 |
cfqd->busy_queues++; |
b4878f245 [PATCH] 02/05: up... |
399 |
cfq_resort_rr_list(cfqq, 0); |
1da177e4c Linux-2.6.12-rc2 |
400 401 402 403 404 |
} static inline void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
3b18152c3 [PATCH] CFQ io sc... |
405 406 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
981a79730 [PATCH] cfq-iosch... |
407 |
list_del_init(&cfqq->cfq_list); |
1da177e4c Linux-2.6.12-rc2 |
408 409 410 411 412 413 414 415 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; } /* * rb tree support functions */ |
5e7053747 [PATCH] cfq-iosch... |
416 |
static inline void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
417 |
{ |
5e7053747 [PATCH] cfq-iosch... |
418 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
419 |
struct cfq_data *cfqd = cfqq->cfqd; |
5e7053747 [PATCH] cfq-iosch... |
420 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
421 |
|
b4878f245 [PATCH] 02/05: up... |
422 423 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
424 |
|
5e7053747 [PATCH] cfq-iosch... |
425 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
426 |
|
dd67d0515 [PATCH] rbtree: s... |
427 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) |
b4878f245 [PATCH] 02/05: up... |
428 |
cfq_del_cfqq_rr(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
429 |
} |
5e7053747 [PATCH] cfq-iosch... |
430 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
431 |
{ |
5e7053747 [PATCH] cfq-iosch... |
432 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
433 |
struct cfq_data *cfqd = cfqq->cfqd; |
21183b07e [PATCH] cfq-iosch... |
434 |
struct request *__alias; |
1da177e4c Linux-2.6.12-rc2 |
435 |
|
5380a101d [PATCH] cfq-iosch... |
436 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
437 438 439 440 441 |
/* * 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... |
442 |
while ((__alias = elv_rb_add(&cfqq->sort_list, rq)) != NULL) |
5e7053747 [PATCH] cfq-iosch... |
443 |
cfq_dispatch_insert(cfqd->queue, __alias); |
5fccbf61b [PATCH] CFQ: requ... |
444 445 446 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
447 448 449 |
} static inline void |
5e7053747 [PATCH] cfq-iosch... |
450 |
cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
451 |
{ |
5380a101d [PATCH] cfq-iosch... |
452 453 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
5e7053747 [PATCH] cfq-iosch... |
454 |
cfq_add_rq_rb(rq); |
1da177e4c Linux-2.6.12-rc2 |
455 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
456 457 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
458 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
459 |
struct task_struct *tsk = current; |
7749a8d42 [PATCH] Propagate... |
460 |
pid_t key = cfq_queue_pid(tsk, bio_data_dir(bio), bio_sync(bio)); |
206dc69b3 [BLOCK] cfq-iosch... |
461 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
462 |
|
206dc69b3 [BLOCK] cfq-iosch... |
463 |
cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio); |
89850f7ee [PATCH] cfq-iosch... |
464 465 |
if (cfqq) { sector_t sector = bio->bi_sector + bio_sectors(bio); |
21183b07e [PATCH] cfq-iosch... |
466 |
return elv_rb_find(&cfqq->sort_list, sector); |
89850f7ee [PATCH] cfq-iosch... |
467 |
} |
1da177e4c Linux-2.6.12-rc2 |
468 |
|
1da177e4c Linux-2.6.12-rc2 |
469 470 |
return NULL; } |
b4878f245 [PATCH] 02/05: up... |
471 |
static void cfq_activate_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
472 |
{ |
22e2c507c [PATCH] Update cf... |
473 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
474 |
|
b4878f245 [PATCH] 02/05: up... |
475 |
cfqd->rq_in_driver++; |
25776e359 [PATCH] cfq-iosch... |
476 477 478 479 480 481 482 483 484 |
/* * If the depth is larger 1, it really could be queueing. But lets * make the mark a little higher - idling could still be good for * low queueing, and a low queueing number could also just indicate * a SCSI mid layer like behaviour where limit+1 is often seen. */ if (!cfqd->hw_tag && cfqd->rq_in_driver > 4) cfqd->hw_tag = 1; |
1da177e4c Linux-2.6.12-rc2 |
485 |
} |
b4878f245 [PATCH] 02/05: up... |
486 |
static void cfq_deactivate_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
487 |
{ |
b4878f245 [PATCH] 02/05: up... |
488 489 490 491 |
struct cfq_data *cfqd = q->elevator->elevator_data; WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
1da177e4c Linux-2.6.12-rc2 |
492 |
} |
b4878f245 [PATCH] 02/05: up... |
493 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
494 |
{ |
5e7053747 [PATCH] cfq-iosch... |
495 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
496 |
|
5e7053747 [PATCH] cfq-iosch... |
497 498 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
499 |
|
b4878f245 [PATCH] 02/05: up... |
500 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
501 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
502 503 504 505 506 |
if (rq_is_meta(rq)) { WARN_ON(!cfqq->meta_pending); cfqq->meta_pending--; } |
1da177e4c Linux-2.6.12-rc2 |
507 508 509 510 511 512 513 |
} static int cfq_merge(request_queue_t *q, struct request **req, struct bio *bio) { struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
514 |
|
206dc69b3 [BLOCK] cfq-iosch... |
515 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
22e2c507c [PATCH] Update cf... |
516 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
517 518 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
519 520 521 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
522 |
} |
21183b07e [PATCH] cfq-iosch... |
523 524 |
static void cfq_merged_request(request_queue_t *q, struct request *req, int type) |
1da177e4c Linux-2.6.12-rc2 |
525 |
{ |
21183b07e [PATCH] cfq-iosch... |
526 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
527 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
528 |
|
5e7053747 [PATCH] cfq-iosch... |
529 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
530 |
} |
1da177e4c Linux-2.6.12-rc2 |
531 532 533 534 535 536 |
} static void cfq_merged_requests(request_queue_t *q, struct request *rq, struct request *next) { |
22e2c507c [PATCH] Update cf... |
537 538 539 540 541 542 |
/* * reposition in fifo if next is older than rq */ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) && time_before(next->start_time, rq->start_time)) list_move(&rq->queuelist, &next->queuelist); |
b4878f245 [PATCH] 02/05: up... |
543 |
cfq_remove_request(next); |
22e2c507c [PATCH] Update cf... |
544 545 546 547 548 549 550 551 552 553 554 555 556 557 |
} static inline void __cfq_set_active_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { if (cfqq) { /* * stop potential idle class queues waiting service */ del_timer(&cfqd->idle_class_timer); cfqq->slice_start = jiffies; cfqq->slice_end = 0; cfqq->slice_left = 0; |
3b18152c3 [PATCH] CFQ io sc... |
558 559 |
cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); |
22e2c507c [PATCH] Update cf... |
560 561 562 563 564 565 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
566 567 568 569 570 571 572 573 574 575 |
* 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, int preempted) { unsigned long now = jiffies; if (cfq_cfqq_wait_request(cfqq)) del_timer(&cfqd->idle_slice_timer); |
53b03744e [PATCH] cfq-iosch... |
576 |
if (!preempted && !cfq_cfqq_dispatched(cfqq)) |
7b14e3b52 [PATCH] cfq-iosch... |
577 |
cfq_schedule_dispatch(cfqd); |
7b14e3b52 [PATCH] cfq-iosch... |
578 579 580 |
cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); |
53b03744e [PATCH] cfq-iosch... |
581 |
cfq_clear_cfqq_queue_new(cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
/* * store what was left of this slice, if the queue idled out * or was preempted */ if (time_after(cfqq->slice_end, now)) cfqq->slice_left = cfqq->slice_end - now; else cfqq->slice_left = 0; if (cfq_cfqq_on_rr(cfqq)) cfq_resort_rr_list(cfqq, preempted); if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { put_io_context(cfqd->active_cic->ioc); cfqd->active_cic = NULL; } cfqd->dispatch_slice = 0; } static inline void cfq_slice_expired(struct cfq_data *cfqd, int preempted) { struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) __cfq_slice_expired(cfqd, cfqq, preempted); } /* |
22e2c507c [PATCH] Update cf... |
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 |
* 0 * 0,1 * 0,1,2 * 0,1,2,3 * 0,1,2,3,4 * 0,1,2,3,4,5 * 0,1,2,3,4,5,6 * 0,1,2,3,4,5,6,7 */ static int cfq_get_next_prio_level(struct cfq_data *cfqd) { int prio, wrap; prio = -1; wrap = 0; do { int p; for (p = cfqd->cur_prio; p <= cfqd->cur_end_prio; p++) { if (!list_empty(&cfqd->rr_list[p])) { prio = p; break; } } if (prio != -1) break; cfqd->cur_prio = 0; if (++cfqd->cur_end_prio == CFQ_PRIO_LISTS) { cfqd->cur_end_prio = 0; if (wrap) break; wrap = 1; |
1da177e4c Linux-2.6.12-rc2 |
648 |
} |
22e2c507c [PATCH] Update cf... |
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 |
} while (1); if (unlikely(prio == -1)) return -1; BUG_ON(prio >= CFQ_PRIO_LISTS); list_splice_init(&cfqd->rr_list[prio], &cfqd->cur_rr); cfqd->cur_prio = prio + 1; if (cfqd->cur_prio > cfqd->cur_end_prio) { cfqd->cur_end_prio = cfqd->cur_prio; cfqd->cur_prio = 0; } if (cfqd->cur_end_prio == CFQ_PRIO_LISTS) { cfqd->cur_prio = 0; cfqd->cur_end_prio = 0; |
1da177e4c Linux-2.6.12-rc2 |
666 |
} |
22e2c507c [PATCH] Update cf... |
667 668 |
return prio; } |
3b18152c3 [PATCH] CFQ io sc... |
669 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
670 |
{ |
7b14e3b52 [PATCH] cfq-iosch... |
671 |
struct cfq_queue *cfqq = NULL; |
22e2c507c [PATCH] Update cf... |
672 |
|
89850f7ee [PATCH] cfq-iosch... |
673 674 675 676 677 678 |
if (!list_empty(&cfqd->cur_rr) || cfq_get_next_prio_level(cfqd) != -1) { /* * if current list is non-empty, grab first entry. if it is * empty, get next prio level and grab first entry then if any * are spliced */ |
22e2c507c [PATCH] Update cf... |
679 |
cfqq = list_entry_cfqq(cfqd->cur_rr.next); |
89850f7ee [PATCH] cfq-iosch... |
680 681 682 683 684 |
} else if (!list_empty(&cfqd->busy_rr)) { /* * If no new queues are available, check if the busy list has * some before falling back to idle io. */ |
e0de0206a [PATCH] cfq-iosch... |
685 |
cfqq = list_entry_cfqq(cfqd->busy_rr.next); |
89850f7ee [PATCH] cfq-iosch... |
686 687 688 689 690 691 |
} else if (!list_empty(&cfqd->idle_rr)) { /* * if we have idle queues and no rt or be queues had pending * requests, either allow immediate service if the grace period * has passed or arm the idle grace timer */ |
22e2c507c [PATCH] Update cf... |
692 693 694 695 696 697 698 699 700 |
unsigned long end = cfqd->last_end_request + CFQ_IDLE_GRACE; if (time_after_eq(jiffies, end)) cfqq = list_entry_cfqq(cfqd->idle_rr.next); else mod_timer(&cfqd->idle_class_timer, end); } __cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
701 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
702 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
703 |
#define CIC_SEEKY(cic) ((cic)->seek_mean > (128 * 1024)) |
22e2c507c [PATCH] Update cf... |
704 705 706 |
static int cfq_arm_slice_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
206dc69b3 [BLOCK] cfq-iosch... |
707 |
struct cfq_io_context *cic; |
7b14e3b52 [PATCH] cfq-iosch... |
708 |
unsigned long sl; |
dd67d0515 [PATCH] rbtree: s... |
709 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
710 711 712 713 714 715 716 |
WARN_ON(cfqq != cfqd->active_queue); /* * idle is disabled, either manually or by past process history */ if (!cfqd->cfq_slice_idle) return 0; |
3b18152c3 [PATCH] CFQ io sc... |
717 |
if (!cfq_cfqq_idle_window(cfqq)) |
22e2c507c [PATCH] Update cf... |
718 719 720 721 |
return 0; /* * task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
722 723 |
cic = cfqd->active_cic; if (!cic || !cic->ioc->task) |
22e2c507c [PATCH] Update cf... |
724 |
return 0; |
3b18152c3 [PATCH] CFQ io sc... |
725 726 |
cfq_mark_cfqq_must_dispatch(cfqq); cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
727 |
|
7b14e3b52 [PATCH] cfq-iosch... |
728 |
sl = min(cfqq->slice_end - 1, (unsigned long) cfqd->cfq_slice_idle); |
206dc69b3 [BLOCK] cfq-iosch... |
729 730 731 732 733 734 |
/* * we don't want to idle for seeks, but we do want to allow * fair distribution of slice time for a process doing back-to-back * seeks. so allow a little bit of time for him to submit a new rq */ |
caaa5f9f0 [PATCH] cfq-iosch... |
735 |
if (sample_valid(cic->seek_samples) && CIC_SEEKY(cic)) |
44eb12312 [PATCH] cfq-iosch... |
736 |
sl = min(sl, msecs_to_jiffies(2)); |
206dc69b3 [BLOCK] cfq-iosch... |
737 |
|
7b14e3b52 [PATCH] cfq-iosch... |
738 |
mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
22e2c507c [PATCH] Update cf... |
739 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
740 |
} |
5e7053747 [PATCH] cfq-iosch... |
741 |
static void cfq_dispatch_insert(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
742 743 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
744 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
745 |
|
5380a101d [PATCH] cfq-iosch... |
746 747 748 |
cfq_remove_request(rq); cfqq->on_dispatch[rq_is_sync(rq)]++; elv_dispatch_sort(q, rq); |
fd61af038 [PATCH] cfq-iosch... |
749 750 751 |
rq = list_entry(q->queue_head.prev, struct request, queuelist); cfqd->last_sector = rq->sector + rq->nr_sectors; |
1da177e4c Linux-2.6.12-rc2 |
752 753 754 755 756 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
5e7053747 [PATCH] cfq-iosch... |
757 |
static inline struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
758 759 |
{ struct cfq_data *cfqd = cfqq->cfqd; |
22e2c507c [PATCH] Update cf... |
760 |
struct request *rq; |
89850f7ee [PATCH] cfq-iosch... |
761 |
int fifo; |
1da177e4c Linux-2.6.12-rc2 |
762 |
|
3b18152c3 [PATCH] CFQ io sc... |
763 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
764 |
return NULL; |
89850f7ee [PATCH] cfq-iosch... |
765 766 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
767 |
|
89850f7ee [PATCH] cfq-iosch... |
768 769 |
fifo = cfq_cfqq_class_sync(cfqq); rq = rq_entry_fifo(cfqq->fifo.next); |
1da177e4c Linux-2.6.12-rc2 |
770 |
|
89850f7ee [PATCH] cfq-iosch... |
771 772 773 |
if (time_after(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo])) { cfq_mark_cfqq_fifo_expire(cfqq); return rq; |
1da177e4c Linux-2.6.12-rc2 |
774 775 776 777 778 779 |
} return NULL; } /* |
3b18152c3 [PATCH] CFQ io sc... |
780 781 782 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
783 |
*/ |
22e2c507c [PATCH] Update cf... |
784 785 786 787 788 789 790 791 792 |
static inline int cfq_prio_to_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { const int base_slice = cfqd->cfq_slice[cfq_cfqq_sync(cfqq)]; WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); return base_slice + (base_slice/CFQ_SLICE_SCALE * (4 - cfqq->ioprio)); } |
1da177e4c Linux-2.6.12-rc2 |
793 |
static inline void |
22e2c507c [PATCH] Update cf... |
794 |
cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
795 |
{ |
22e2c507c [PATCH] Update cf... |
796 797 |
cfqq->slice_end = cfq_prio_to_slice(cfqd, cfqq) + jiffies; } |
1da177e4c Linux-2.6.12-rc2 |
798 |
|
22e2c507c [PATCH] Update cf... |
799 800 801 802 |
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 |
803 |
|
22e2c507c [PATCH] Update cf... |
804 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
805 |
|
22e2c507c [PATCH] Update cf... |
806 |
return 2 * (base_rq + base_rq * (CFQ_PRIO_LISTS - 1 - cfqq->ioprio)); |
1da177e4c Linux-2.6.12-rc2 |
807 |
} |
22e2c507c [PATCH] Update cf... |
808 809 810 |
/* * get next queue for service */ |
1b5ed5e1f [BLOCK] cfq-iosch... |
811 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
812 |
{ |
22e2c507c [PATCH] Update cf... |
813 |
unsigned long now = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
814 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
815 |
|
22e2c507c [PATCH] Update cf... |
816 817 818 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
819 |
|
22e2c507c [PATCH] Update cf... |
820 821 822 |
/* * slice has expired */ |
3b18152c3 [PATCH] CFQ io sc... |
823 824 |
if (!cfq_cfqq_must_dispatch(cfqq) && time_after(now, cfqq->slice_end)) goto expire; |
1da177e4c Linux-2.6.12-rc2 |
825 |
|
22e2c507c [PATCH] Update cf... |
826 827 828 829 |
/* * if queue has requests, dispatch one. if not, check if * enough slice is left to wait for one */ |
dd67d0515 [PATCH] rbtree: s... |
830 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
831 |
goto keep_queue; |
caaa5f9f0 [PATCH] cfq-iosch... |
832 833 834 835 |
else if (cfq_cfqq_dispatched(cfqq)) { cfqq = NULL; goto keep_queue; } else if (cfq_cfqq_class_sync(cfqq)) { |
22e2c507c [PATCH] Update cf... |
836 837 838 |
if (cfq_arm_slice_timer(cfqd, cfqq)) return NULL; } |
3b18152c3 [PATCH] CFQ io sc... |
839 |
expire: |
22e2c507c [PATCH] Update cf... |
840 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
841 842 |
new_queue: cfqq = cfq_set_active_queue(cfqd); |
22e2c507c [PATCH] Update cf... |
843 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
844 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
845 846 847 848 849 850 851 |
} static int __cfq_dispatch_requests(struct cfq_data *cfqd, struct cfq_queue *cfqq, int max_dispatch) { int dispatched = 0; |
dd67d0515 [PATCH] rbtree: s... |
852 |
BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
853 854 |
do { |
5e7053747 [PATCH] cfq-iosch... |
855 |
struct request *rq; |
1da177e4c Linux-2.6.12-rc2 |
856 857 |
/* |
22e2c507c [PATCH] Update cf... |
858 |
* follow expired path, else get first next available |
1da177e4c Linux-2.6.12-rc2 |
859 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
860 861 |
if ((rq = cfq_check_fifo(cfqq)) == NULL) rq = cfqq->next_rq; |
22e2c507c [PATCH] Update cf... |
862 863 864 865 |
/* * finally, insert request into driver dispatch list */ |
5e7053747 [PATCH] cfq-iosch... |
866 |
cfq_dispatch_insert(cfqd->queue, rq); |
1da177e4c Linux-2.6.12-rc2 |
867 |
|
22e2c507c [PATCH] Update cf... |
868 869 |
cfqd->dispatch_slice++; dispatched++; |
1da177e4c Linux-2.6.12-rc2 |
870 |
|
22e2c507c [PATCH] Update cf... |
871 |
if (!cfqd->active_cic) { |
5e7053747 [PATCH] cfq-iosch... |
872 873 |
atomic_inc(&RQ_CIC(rq)->ioc->refcount); cfqd->active_cic = RQ_CIC(rq); |
22e2c507c [PATCH] Update cf... |
874 |
} |
1da177e4c Linux-2.6.12-rc2 |
875 |
|
dd67d0515 [PATCH] rbtree: s... |
876 |
if (RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
877 878 879 880 881 |
break; } while (dispatched < max_dispatch); /* |
caaa5f9f0 [PATCH] cfq-iosch... |
882 |
* if slice end isn't set yet, set it. |
22e2c507c [PATCH] Update cf... |
883 884 885 886 887 888 889 890 891 892 |
*/ if (!cfqq->slice_end) cfq_set_prio_slice(cfqd, cfqq); /* * expire an async queue immediately if it has used up its slice. idle * queue always expire after 1 dispatch round. */ if ((!cfq_cfqq_sync(cfqq) && cfqd->dispatch_slice >= cfq_prio_to_maxrq(cfqd, cfqq)) || |
caaa5f9f0 [PATCH] cfq-iosch... |
893 894 |
cfq_class_idle(cfqq) || !cfq_cfqq_idle_window(cfqq)) |
22e2c507c [PATCH] Update cf... |
895 896 897 898 899 900 |
cfq_slice_expired(cfqd, 0); return dispatched; } static int |
1b5ed5e1f [BLOCK] cfq-iosch... |
901 902 |
cfq_forced_dispatch_cfqqs(struct list_head *list) { |
1b5ed5e1f [BLOCK] cfq-iosch... |
903 |
struct cfq_queue *cfqq, *next; |
caaa5f9f0 [PATCH] cfq-iosch... |
904 |
int dispatched; |
1b5ed5e1f [BLOCK] cfq-iosch... |
905 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
906 |
dispatched = 0; |
1b5ed5e1f [BLOCK] cfq-iosch... |
907 |
list_for_each_entry_safe(cfqq, next, list, cfq_list) { |
5e7053747 [PATCH] cfq-iosch... |
908 909 |
while (cfqq->next_rq) { cfq_dispatch_insert(cfqq->cfqd->queue, cfqq->next_rq); |
1b5ed5e1f [BLOCK] cfq-iosch... |
910 911 912 913 |
dispatched++; } BUG_ON(!list_empty(&cfqq->fifo)); } |
caaa5f9f0 [PATCH] cfq-iosch... |
914 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 |
return dispatched; } static int cfq_forced_dispatch(struct cfq_data *cfqd) { int i, dispatched = 0; for (i = 0; i < CFQ_PRIO_LISTS; i++) dispatched += cfq_forced_dispatch_cfqqs(&cfqd->rr_list[i]); dispatched += cfq_forced_dispatch_cfqqs(&cfqd->busy_rr); dispatched += cfq_forced_dispatch_cfqqs(&cfqd->cur_rr); dispatched += cfq_forced_dispatch_cfqqs(&cfqd->idle_rr); cfq_slice_expired(cfqd, 0); BUG_ON(cfqd->busy_queues); return dispatched; } static int |
b4878f245 [PATCH] 02/05: up... |
938 |
cfq_dispatch_requests(request_queue_t *q, int force) |
22e2c507c [PATCH] Update cf... |
939 940 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
caaa5f9f0 [PATCH] cfq-iosch... |
941 942 |
struct cfq_queue *cfqq, *prev_cfqq; int dispatched; |
22e2c507c [PATCH] Update cf... |
943 944 945 |
if (!cfqd->busy_queues) return 0; |
1b5ed5e1f [BLOCK] cfq-iosch... |
946 947 |
if (unlikely(force)) return cfq_forced_dispatch(cfqd); |
caaa5f9f0 [PATCH] cfq-iosch... |
948 949 950 |
dispatched = 0; prev_cfqq = NULL; while ((cfqq = cfq_select_queue(cfqd)) != NULL) { |
b4878f245 [PATCH] 02/05: up... |
951 |
int max_dispatch; |
caaa5f9f0 [PATCH] cfq-iosch... |
952 953 954 955 956 |
/* * Don't repeat dispatch from the previous queue. */ if (prev_cfqq == cfqq) break; |
3b18152c3 [PATCH] CFQ io sc... |
957 958 |
cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
959 |
del_timer(&cfqd->idle_slice_timer); |
1b5ed5e1f [BLOCK] cfq-iosch... |
960 961 962 |
max_dispatch = cfqd->cfq_quantum; if (cfq_class_idle(cfqq)) max_dispatch = 1; |
1da177e4c Linux-2.6.12-rc2 |
963 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
964 965 966 967 968 969 970 971 972 973 |
dispatched += __cfq_dispatch_requests(cfqd, cfqq, max_dispatch); /* * If the dispatch cfqq has idling enabled and is still * the active queue, break out. */ if (cfq_cfqq_idle_window(cfqq) && cfqd->active_queue) break; prev_cfqq = cfqq; |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
975 |
return dispatched; |
1da177e4c Linux-2.6.12-rc2 |
976 |
} |
1da177e4c Linux-2.6.12-rc2 |
977 |
/* |
5e7053747 [PATCH] cfq-iosch... |
978 979 |
* 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 |
980 981 982 983 984 |
* * queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
985 986 987 |
struct cfq_data *cfqd = cfqq->cfqd; BUG_ON(atomic_read(&cfqq->ref) <= 0); |
1da177e4c Linux-2.6.12-rc2 |
988 989 990 991 992 |
if (!atomic_dec_and_test(&cfqq->ref)) return; BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
993 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
3b18152c3 [PATCH] CFQ io sc... |
994 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
995 |
|
7b14e3b52 [PATCH] cfq-iosch... |
996 |
if (unlikely(cfqd->active_queue == cfqq)) |
3b18152c3 [PATCH] CFQ io sc... |
997 |
__cfq_slice_expired(cfqd, cfqq, 0); |
22e2c507c [PATCH] Update cf... |
998 |
|
1da177e4c Linux-2.6.12-rc2 |
999 1000 1001 1002 1003 1004 1005 |
/* * it's on the empty list and still hashed */ list_del(&cfqq->cfq_list); hlist_del(&cfqq->cfq_hash); kmem_cache_free(cfq_pool, cfqq); } |
1ea25ecb7 [PATCH] Audit blo... |
1006 |
static struct cfq_queue * |
3b18152c3 [PATCH] CFQ io sc... |
1007 1008 |
__cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned int prio, const int hashval) |
1da177e4c Linux-2.6.12-rc2 |
1009 1010 |
{ struct hlist_head *hash_list = &cfqd->cfq_hash[hashval]; |
206dc69b3 [BLOCK] cfq-iosch... |
1011 1012 |
struct hlist_node *entry; struct cfq_queue *__cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1013 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1014 |
hlist_for_each_entry(__cfqq, entry, hash_list, cfq_hash) { |
b0a6916bc [PATCH] fix cfq h... |
1015 |
const unsigned short __p = IOPRIO_PRIO_VALUE(__cfqq->org_ioprio_class, __cfqq->org_ioprio); |
1da177e4c Linux-2.6.12-rc2 |
1016 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1017 |
if (__cfqq->key == key && (__p == prio || !prio)) |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 1020 1021 1022 1023 1024 |
return __cfqq; } return NULL; } static struct cfq_queue * |
3b18152c3 [PATCH] CFQ io sc... |
1025 |
cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned short prio) |
1da177e4c Linux-2.6.12-rc2 |
1026 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
1027 |
return __cfq_find_cfq_hash(cfqd, key, prio, hash_long(key, CFQ_QHASH_SHIFT)); |
1da177e4c Linux-2.6.12-rc2 |
1028 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1029 |
static void cfq_free_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1030 |
{ |
22e2c507c [PATCH] Update cf... |
1031 |
struct cfq_io_context *__cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1032 1033 |
struct rb_node *n; int freed = 0; |
1da177e4c Linux-2.6.12-rc2 |
1034 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1035 1036 1037 |
while ((n = rb_first(&ioc->cic_root)) != NULL) { __cic = rb_entry(n, struct cfq_io_context, rb_node); rb_erase(&__cic->rb_node, &ioc->cic_root); |
22e2c507c [PATCH] Update cf... |
1038 |
kmem_cache_free(cfq_ioc_pool, __cic); |
334e94de9 [PATCH] deal with... |
1039 |
freed++; |
1da177e4c Linux-2.6.12-rc2 |
1040 |
} |
4050cf167 [PATCH] cfq-iosch... |
1041 1042 1043 |
elv_ioc_count_mod(ioc_count, -freed); if (ioc_gone && !elv_ioc_count_read(ioc_count)) |
334e94de9 [PATCH] deal with... |
1044 |
complete(ioc_gone); |
1da177e4c Linux-2.6.12-rc2 |
1045 |
} |
89850f7ee [PATCH] cfq-iosch... |
1046 |
static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1047 |
{ |
89850f7ee [PATCH] cfq-iosch... |
1048 1049 |
if (unlikely(cfqq == cfqd->active_queue)) __cfq_slice_expired(cfqd, cfqq, 0); |
22e2c507c [PATCH] Update cf... |
1050 |
|
89850f7ee [PATCH] cfq-iosch... |
1051 1052 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
1053 |
|
89850f7ee [PATCH] cfq-iosch... |
1054 1055 1056 |
static void __cfq_exit_single_io_context(struct cfq_data *cfqd, struct cfq_io_context *cic) { |
fc46379da [PATCH] cfq-iosch... |
1057 1058 1059 |
list_del_init(&cic->queue_list); smp_wmb(); cic->key = NULL; |
12a057321 [PATCH] keep sync... |
1060 |
if (cic->cfqq[ASYNC]) { |
89850f7ee [PATCH] cfq-iosch... |
1061 |
cfq_exit_cfqq(cfqd, cic->cfqq[ASYNC]); |
12a057321 [PATCH] keep sync... |
1062 1063 1064 1065 |
cic->cfqq[ASYNC] = NULL; } if (cic->cfqq[SYNC]) { |
89850f7ee [PATCH] cfq-iosch... |
1066 |
cfq_exit_cfqq(cfqd, cic->cfqq[SYNC]); |
12a057321 [PATCH] keep sync... |
1067 1068 |
cic->cfqq[SYNC] = NULL; } |
89850f7ee [PATCH] cfq-iosch... |
1069 1070 1071 1072 1073 1074 1075 1076 1077 |
} /* * Called with interrupts disabled */ static void cfq_exit_single_io_context(struct cfq_io_context *cic) { struct cfq_data *cfqd = cic->key; |
89850f7ee [PATCH] cfq-iosch... |
1078 1079 |
if (cfqd) { request_queue_t *q = cfqd->queue; |
fc46379da [PATCH] cfq-iosch... |
1080 |
spin_lock_irq(q->queue_lock); |
89850f7ee [PATCH] cfq-iosch... |
1081 |
__cfq_exit_single_io_context(cfqd, cic); |
fc46379da [PATCH] cfq-iosch... |
1082 |
spin_unlock_irq(q->queue_lock); |
89850f7ee [PATCH] cfq-iosch... |
1083 |
} |
1da177e4c Linux-2.6.12-rc2 |
1084 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1085 |
static void cfq_exit_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1086 |
{ |
22e2c507c [PATCH] Update cf... |
1087 |
struct cfq_io_context *__cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1088 |
struct rb_node *n; |
22e2c507c [PATCH] Update cf... |
1089 |
|
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 |
/* * put the reference this task is holding to the various queues */ |
e2d74ac06 [PATCH] [BLOCK] c... |
1093 1094 1095 1096 |
n = rb_first(&ioc->cic_root); while (n != NULL) { __cic = rb_entry(n, struct cfq_io_context, rb_node); |
22e2c507c [PATCH] Update cf... |
1097 |
cfq_exit_single_io_context(__cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1098 |
n = rb_next(n); |
1da177e4c Linux-2.6.12-rc2 |
1099 |
} |
1da177e4c Linux-2.6.12-rc2 |
1100 |
} |
22e2c507c [PATCH] Update cf... |
1101 |
static struct cfq_io_context * |
8267e268e [PATCH] gfp_t: bl... |
1102 |
cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1103 |
{ |
b5deef901 [PATCH] Make sure... |
1104 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
1105 |
|
b5deef901 [PATCH] Make sure... |
1106 |
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
1107 |
if (cic) { |
553698f94 [PATCH] cfq-iosch... |
1108 |
memset(cic, 0, sizeof(*cic)); |
22e2c507c [PATCH] Update cf... |
1109 |
cic->last_end_request = jiffies; |
553698f94 [PATCH] cfq-iosch... |
1110 |
INIT_LIST_HEAD(&cic->queue_list); |
22e2c507c [PATCH] Update cf... |
1111 1112 |
cic->dtor = cfq_free_io_context; cic->exit = cfq_exit_io_context; |
4050cf167 [PATCH] cfq-iosch... |
1113 |
elv_ioc_count_inc(ioc_count); |
1da177e4c Linux-2.6.12-rc2 |
1114 1115 1116 1117 |
} return cic; } |
22e2c507c [PATCH] Update cf... |
1118 1119 1120 1121 |
static void cfq_init_prio_data(struct cfq_queue *cfqq) { struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
1122 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 |
return; ioprio_class = IOPRIO_PRIO_CLASS(tsk->ioprio); switch (ioprio_class) { default: printk(KERN_ERR "cfq: bad prio %x ", ioprio_class); case IOPRIO_CLASS_NONE: /* * no prio set, place us in the middle of the BE classes */ cfqq->ioprio = task_nice_ioprio(tsk); cfqq->ioprio_class = IOPRIO_CLASS_BE; break; case IOPRIO_CLASS_RT: cfqq->ioprio = task_ioprio(tsk); cfqq->ioprio_class = IOPRIO_CLASS_RT; break; case IOPRIO_CLASS_BE: cfqq->ioprio = task_ioprio(tsk); cfqq->ioprio_class = IOPRIO_CLASS_BE; break; case IOPRIO_CLASS_IDLE: cfqq->ioprio_class = IOPRIO_CLASS_IDLE; cfqq->ioprio = 7; |
3b18152c3 [PATCH] CFQ io sc... |
1148 |
cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1149 1150 1151 1152 1153 1154 1155 1156 1157 |
break; } /* * 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... |
1158 |
if (cfq_cfqq_on_rr(cfqq)) |
22e2c507c [PATCH] Update cf... |
1159 |
cfq_resort_rr_list(cfqq, 0); |
3b18152c3 [PATCH] CFQ io sc... |
1160 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
1161 |
} |
478a82b0e [PATCH] switch to... |
1162 |
static inline void changed_ioprio(struct cfq_io_context *cic) |
22e2c507c [PATCH] Update cf... |
1163 |
{ |
478a82b0e [PATCH] switch to... |
1164 1165 |
struct cfq_data *cfqd = cic->key; struct cfq_queue *cfqq; |
c1b707d25 [PATCH] CFQ: bad ... |
1166 |
unsigned long flags; |
35e6077cb [PATCH] cfq-iosch... |
1167 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1168 1169 |
if (unlikely(!cfqd)) return; |
c1b707d25 [PATCH] CFQ: bad ... |
1170 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
caaa5f9f0 [PATCH] cfq-iosch... |
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 |
cfqq = cic->cfqq[ASYNC]; if (cfqq) { struct cfq_queue *new_cfqq; new_cfqq = cfq_get_queue(cfqd, CFQ_KEY_ASYNC, cic->ioc->task, GFP_ATOMIC); if (new_cfqq) { cic->cfqq[ASYNC] = new_cfqq; cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
1181 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1182 1183 1184 1185 |
cfqq = cic->cfqq[SYNC]; if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
c1b707d25 [PATCH] CFQ: bad ... |
1186 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
1187 |
} |
fc46379da [PATCH] cfq-iosch... |
1188 |
static void cfq_ioc_set_ioprio(struct io_context *ioc) |
22e2c507c [PATCH] Update cf... |
1189 |
{ |
a6a0763a6 [PATCH] fix the e... |
1190 |
struct cfq_io_context *cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1191 |
struct rb_node *n; |
a6a0763a6 [PATCH] fix the e... |
1192 |
|
fc46379da [PATCH] cfq-iosch... |
1193 |
ioc->ioprio_changed = 0; |
a6a0763a6 [PATCH] fix the e... |
1194 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1195 1196 1197 |
n = rb_first(&ioc->cic_root); while (n != NULL) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
3793c65c1 [PATCH] cfq-iosch... |
1198 |
|
478a82b0e [PATCH] switch to... |
1199 |
changed_ioprio(cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1200 1201 |
n = rb_next(n); } |
22e2c507c [PATCH] Update cf... |
1202 1203 1204 |
} static struct cfq_queue * |
6f325a134 [PATCH] fix cfq_g... |
1205 |
cfq_get_queue(struct cfq_data *cfqd, unsigned int key, struct task_struct *tsk, |
8267e268e [PATCH] gfp_t: bl... |
1206 |
gfp_t gfp_mask) |
22e2c507c [PATCH] Update cf... |
1207 1208 1209 |
{ const int hashval = hash_long(key, CFQ_QHASH_SHIFT); struct cfq_queue *cfqq, *new_cfqq = NULL; |
6f325a134 [PATCH] fix cfq_g... |
1210 |
unsigned short ioprio; |
22e2c507c [PATCH] Update cf... |
1211 1212 |
retry: |
6f325a134 [PATCH] fix cfq_g... |
1213 |
ioprio = tsk->ioprio; |
3b18152c3 [PATCH] CFQ io sc... |
1214 |
cfqq = __cfq_find_cfq_hash(cfqd, key, ioprio, hashval); |
22e2c507c [PATCH] Update cf... |
1215 1216 1217 1218 1219 1220 |
if (!cfqq) { if (new_cfqq) { cfqq = new_cfqq; new_cfqq = NULL; } else if (gfp_mask & __GFP_WAIT) { |
89850f7ee [PATCH] cfq-iosch... |
1221 1222 1223 1224 1225 1226 |
/* * Inform the allocator of the fact that we will * just repeat this allocation if it fails, to allow * the allocator to do whatever it needs to attempt to * free memory. */ |
22e2c507c [PATCH] Update cf... |
1227 |
spin_unlock_irq(cfqd->queue->queue_lock); |
b5deef901 [PATCH] Make sure... |
1228 |
new_cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask|__GFP_NOFAIL, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
1229 1230 1231 |
spin_lock_irq(cfqd->queue->queue_lock); goto retry; } else { |
b5deef901 [PATCH] Make sure... |
1232 |
cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
1233 1234 1235 1236 1237 1238 1239 1240 |
if (!cfqq) goto out; } memset(cfqq, 0, sizeof(*cfqq)); INIT_HLIST_NODE(&cfqq->cfq_hash); INIT_LIST_HEAD(&cfqq->cfq_list); |
22e2c507c [PATCH] Update cf... |
1241 1242 1243 1244 1245 1246 |
INIT_LIST_HEAD(&cfqq->fifo); cfqq->key = key; hlist_add_head(&cfqq->cfq_hash, &cfqd->cfq_hash[hashval]); atomic_set(&cfqq->ref, 0); cfqq->cfqd = cfqd; |
22e2c507c [PATCH] Update cf... |
1247 1248 1249 1250 |
/* * set ->slice_left to allow preemption for a new process */ cfqq->slice_left = 2 * cfqd->cfq_slice_idle; |
caaa5f9f0 [PATCH] cfq-iosch... |
1251 |
cfq_mark_cfqq_idle_window(cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1252 |
cfq_mark_cfqq_prio_changed(cfqq); |
53b03744e [PATCH] cfq-iosch... |
1253 |
cfq_mark_cfqq_queue_new(cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1254 |
cfq_init_prio_data(cfqq); |
22e2c507c [PATCH] Update cf... |
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 |
} if (new_cfqq) kmem_cache_free(cfq_pool, new_cfqq); atomic_inc(&cfqq->ref); out: WARN_ON((gfp_mask & __GFP_WAIT) && !cfqq); return cfqq; } |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1265 1266 1267 |
static void cfq_drop_dead_cic(struct io_context *ioc, struct cfq_io_context *cic) { |
fc46379da [PATCH] cfq-iosch... |
1268 |
WARN_ON(!list_empty(&cic->queue_list)); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1269 |
rb_erase(&cic->rb_node, &ioc->cic_root); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1270 |
kmem_cache_free(cfq_ioc_pool, cic); |
4050cf167 [PATCH] cfq-iosch... |
1271 |
elv_ioc_count_dec(ioc_count); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1272 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1273 1274 1275 |
static struct cfq_io_context * cfq_cic_rb_lookup(struct cfq_data *cfqd, struct io_context *ioc) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1276 |
struct rb_node *n; |
e2d74ac06 [PATCH] [BLOCK] c... |
1277 |
struct cfq_io_context *cic; |
be3b07535 [PATCH] cfq: Furt... |
1278 |
void *k, *key = cfqd; |
e2d74ac06 [PATCH] [BLOCK] c... |
1279 |
|
dbecf3ab4 [PATCH 2/2] cfq: ... |
1280 1281 |
restart: n = ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1282 1283 |
while (n) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1284 1285 1286 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = cic->key; if (unlikely(!k)) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1287 1288 1289 |
cfq_drop_dead_cic(ioc, cic); goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1290 |
|
be3b07535 [PATCH] cfq: Furt... |
1291 |
if (key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1292 |
n = n->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1293 |
else if (key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 |
n = n->rb_right; else return cic; } return NULL; } static inline void cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc, struct cfq_io_context *cic) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1306 1307 |
struct rb_node **p; struct rb_node *parent; |
e2d74ac06 [PATCH] [BLOCK] c... |
1308 |
struct cfq_io_context *__cic; |
0261d6886 [PATCH] CFQ: use ... |
1309 |
unsigned long flags; |
be3b07535 [PATCH] cfq: Furt... |
1310 |
void *k; |
e2d74ac06 [PATCH] [BLOCK] c... |
1311 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1312 1313 |
cic->ioc = ioc; cic->key = cfqd; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1314 1315 1316 |
restart: parent = NULL; p = &ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1317 1318 1319 |
while (*p) { parent = *p; __cic = rb_entry(parent, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1320 1321 1322 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = __cic->key; if (unlikely(!k)) { |
be33c3a67 [PATCH] cfq_cic_l... |
1323 |
cfq_drop_dead_cic(ioc, __cic); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1324 1325 |
goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1326 |
|
be3b07535 [PATCH] cfq: Furt... |
1327 |
if (cic->key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1328 |
p = &(*p)->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1329 |
else if (cic->key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1330 1331 1332 1333 1334 1335 1336 |
p = &(*p)->rb_right; else BUG(); } rb_link_node(&cic->rb_node, parent, p); rb_insert_color(&cic->rb_node, &ioc->cic_root); |
fc46379da [PATCH] cfq-iosch... |
1337 |
|
0261d6886 [PATCH] CFQ: use ... |
1338 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
1339 |
list_add(&cic->queue_list, &cfqd->cic_list); |
0261d6886 [PATCH] CFQ: use ... |
1340 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
1341 |
} |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 1344 |
/* * 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... |
1345 |
* than one device managed by cfq. |
1da177e4c Linux-2.6.12-rc2 |
1346 1347 |
*/ static struct cfq_io_context * |
e2d74ac06 [PATCH] [BLOCK] c... |
1348 |
cfq_get_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1349 |
{ |
22e2c507c [PATCH] Update cf... |
1350 |
struct io_context *ioc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1351 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
1352 |
|
22e2c507c [PATCH] Update cf... |
1353 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
1da177e4c Linux-2.6.12-rc2 |
1354 |
|
b5deef901 [PATCH] Make sure... |
1355 |
ioc = get_io_context(gfp_mask, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
1356 1357 |
if (!ioc) return NULL; |
e2d74ac06 [PATCH] [BLOCK] c... |
1358 1359 1360 |
cic = cfq_cic_rb_lookup(cfqd, ioc); if (cic) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1361 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1362 1363 1364 |
cic = cfq_alloc_io_context(cfqd, gfp_mask); if (cic == NULL) goto err; |
1da177e4c Linux-2.6.12-rc2 |
1365 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1366 |
cfq_cic_link(cfqd, ioc, cic); |
1da177e4c Linux-2.6.12-rc2 |
1367 |
out: |
fc46379da [PATCH] cfq-iosch... |
1368 1369 1370 |
smp_read_barrier_depends(); if (unlikely(ioc->ioprio_changed)) cfq_ioc_set_ioprio(ioc); |
1da177e4c Linux-2.6.12-rc2 |
1371 1372 1373 1374 1375 |
return cic; err: put_io_context(ioc); return NULL; } |
22e2c507c [PATCH] Update cf... |
1376 1377 |
static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic) |
1da177e4c Linux-2.6.12-rc2 |
1378 |
{ |
22e2c507c [PATCH] Update cf... |
1379 |
unsigned long elapsed, ttime; |
1da177e4c Linux-2.6.12-rc2 |
1380 |
|
22e2c507c [PATCH] Update cf... |
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 |
/* * if this context already has stuff queued, thinktime is from * last queue not last end */ #if 0 if (time_after(cic->last_end_request, cic->last_queue)) elapsed = jiffies - cic->last_end_request; else elapsed = jiffies - cic->last_queue; #else elapsed = jiffies - cic->last_end_request; #endif |
1da177e4c Linux-2.6.12-rc2 |
1393 |
|
22e2c507c [PATCH] Update cf... |
1394 |
ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle); |
db3b5848e When cfq I/O sche... |
1395 |
|
22e2c507c [PATCH] Update cf... |
1396 1397 1398 1399 |
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 |
1400 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1401 |
static void |
bb37b94c6 [BLOCK] Cleanup u... |
1402 |
cfq_update_io_seektime(struct cfq_io_context *cic, struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
1403 1404 1405 |
{ sector_t sdist; u64 total; |
5e7053747 [PATCH] cfq-iosch... |
1406 1407 |
if (cic->last_request_pos < rq->sector) sdist = rq->sector - cic->last_request_pos; |
206dc69b3 [BLOCK] cfq-iosch... |
1408 |
else |
5e7053747 [PATCH] cfq-iosch... |
1409 |
sdist = cic->last_request_pos - rq->sector; |
206dc69b3 [BLOCK] cfq-iosch... |
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 |
/* * Don't allow the seek distance to get too large from the * odd fragment, pagein, etc */ if (cic->seek_samples <= 60) /* second&third seek */ sdist = min(sdist, (cic->seek_mean * 4) + 2*1024*1024); else sdist = min(sdist, (cic->seek_mean * 4) + 2*1024*64); cic->seek_samples = (7*cic->seek_samples + 256) / 8; cic->seek_total = (7*cic->seek_total + (u64)256*sdist) / 8; total = cic->seek_total + (cic->seek_samples/2); do_div(total, cic->seek_samples); cic->seek_mean = (sector_t)total; } |
1da177e4c Linux-2.6.12-rc2 |
1426 |
|
22e2c507c [PATCH] Update cf... |
1427 1428 1429 1430 1431 1432 1433 1434 |
/* * 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) { |
3b18152c3 [PATCH] CFQ io sc... |
1435 |
int enable_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1436 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1437 1438 |
if (!cic->ioc->task || !cfqd->cfq_slice_idle || (cfqd->hw_tag && CIC_SEEKY(cic))) |
22e2c507c [PATCH] Update cf... |
1439 1440 1441 1442 1443 1444 |
enable_idle = 0; else if (sample_valid(cic->ttime_samples)) { if (cic->ttime_mean > cfqd->cfq_slice_idle) enable_idle = 0; else enable_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
1445 |
} |
3b18152c3 [PATCH] CFQ io sc... |
1446 1447 1448 1449 |
if (enable_idle) cfq_mark_cfqq_idle_window(cfqq); else cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1450 |
} |
1da177e4c Linux-2.6.12-rc2 |
1451 |
|
22e2c507c [PATCH] Update cf... |
1452 1453 1454 1455 1456 1457 1458 |
/* * 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. */ static int cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
1459 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
1460 1461 1462 1463 1464 1465 1466 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfq_class_idle(new_cfqq)) return 0; if (!cfqq) |
caaa5f9f0 [PATCH] cfq-iosch... |
1467 |
return 0; |
22e2c507c [PATCH] Update cf... |
1468 1469 1470 |
if (cfq_class_idle(cfqq)) return 1; |
3b18152c3 [PATCH] CFQ io sc... |
1471 |
if (!cfq_cfqq_wait_request(new_cfqq)) |
22e2c507c [PATCH] Update cf... |
1472 1473 1474 1475 1476 1477 |
return 0; /* * if it doesn't have slice left, forget it */ if (new_cfqq->slice_left < cfqd->cfq_slice_idle) return 0; |
374f84ac3 [PATCH] cfq-iosch... |
1478 1479 1480 1481 |
/* * if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
5e7053747 [PATCH] cfq-iosch... |
1482 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
22e2c507c [PATCH] Update cf... |
1483 |
return 1; |
374f84ac3 [PATCH] cfq-iosch... |
1484 1485 1486 1487 1488 1489 |
/* * 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. */ if (rq_is_meta(rq) && !cfqq->meta_pending) return 1; |
22e2c507c [PATCH] Update cf... |
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 |
return 0; } /* * 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) { |
bf5722567 [PATCH] cfq-iosch... |
1500 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
1501 1502 1503 |
if (!cfqq->slice_left) cfqq->slice_left = cfq_prio_to_slice(cfqd, cfqq) / 2; |
bf5722567 [PATCH] cfq-iosch... |
1504 1505 1506 1507 1508 1509 |
/* * 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)); list_move(&cfqq->cfq_list, &cfqd->cur_rr); |
22e2c507c [PATCH] Update cf... |
1510 |
cfqq->slice_end = cfqq->slice_left + jiffies; |
22e2c507c [PATCH] Update cf... |
1511 1512 1513 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
1514 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
1515 1516 1517 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
1518 1519 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
1520 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1521 |
struct cfq_io_context *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
1522 |
|
374f84ac3 [PATCH] cfq-iosch... |
1523 1524 |
if (rq_is_meta(rq)) cfqq->meta_pending++; |
9c2c38a12 [PATCH] cfq-iosch... |
1525 |
/* |
5380a101d [PATCH] cfq-iosch... |
1526 |
* check if this request is a better next-serve candidate)) { |
21183b07e [PATCH] cfq-iosch... |
1527 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
1528 1529 |
cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq); BUG_ON(!cfqq->next_rq); |
21183b07e [PATCH] cfq-iosch... |
1530 1531 |
/* |
9c2c38a12 [PATCH] cfq-iosch... |
1532 1533 1534 |
* we never wait for an async request and we don't allow preemption * of an async request. so just return early */ |
5e7053747 [PATCH] cfq-iosch... |
1535 |
if (!rq_is_sync(rq)) { |
12e9fddd6 [PATCH] cfq-iosch... |
1536 1537 1538 1539 1540 1541 1542 |
/* * sync process issued an async request, if it's waiting * then expire it and kick rq handling. */ if (cic == cfqd->active_cic && del_timer(&cfqd->idle_slice_timer)) { cfq_slice_expired(cfqd, 0); |
dc72ef4ae [PATCH] Add blk_s... |
1543 |
blk_start_queueing(cfqd->queue); |
12e9fddd6 [PATCH] cfq-iosch... |
1544 |
} |
9c2c38a12 [PATCH] cfq-iosch... |
1545 |
return; |
12e9fddd6 [PATCH] cfq-iosch... |
1546 |
} |
22e2c507c [PATCH] Update cf... |
1547 |
|
9c2c38a12 [PATCH] cfq-iosch... |
1548 |
cfq_update_io_thinktime(cfqd, cic); |
bb37b94c6 [BLOCK] Cleanup u... |
1549 |
cfq_update_io_seektime(cic, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
1550 1551 1552 |
cfq_update_idle_window(cfqd, cfqq, cic); cic->last_queue = jiffies; |
5e7053747 [PATCH] cfq-iosch... |
1553 |
cic->last_request_pos = rq->sector + rq->nr_sectors; |
22e2c507c [PATCH] Update cf... |
1554 1555 1556 1557 1558 1559 1560 |
if (cfqq == cfqd->active_queue) { /* * if we are waiting for a request for this queue, let it rip * immediately and flag that we must not expire this queue * just now */ |
3b18152c3 [PATCH] CFQ io sc... |
1561 1562 |
if (cfq_cfqq_wait_request(cfqq)) { cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1563 |
del_timer(&cfqd->idle_slice_timer); |
dc72ef4ae [PATCH] Add blk_s... |
1564 |
blk_start_queueing(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
1565 |
} |
5e7053747 [PATCH] cfq-iosch... |
1566 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
1567 1568 1569 1570 1571 1572 |
/* * not the active queue - expire current slice if it is * idle and has expired it's mean thinktime or this new queue * has some old slice time left and is of higher priority */ cfq_preempt_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1573 |
cfq_mark_cfqq_must_dispatch(cfqq); |
dc72ef4ae [PATCH] Add blk_s... |
1574 |
blk_start_queueing(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
1575 |
} |
1da177e4c Linux-2.6.12-rc2 |
1576 |
} |
b4878f245 [PATCH] 02/05: up... |
1577 |
static void cfq_insert_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1578 |
{ |
b4878f245 [PATCH] 02/05: up... |
1579 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
1580 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
1581 1582 |
cfq_init_prio_data(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1583 |
|
5e7053747 [PATCH] cfq-iosch... |
1584 |
cfq_add_rq_rb(rq); |
1da177e4c Linux-2.6.12-rc2 |
1585 |
|
22e2c507c [PATCH] Update cf... |
1586 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
5e7053747 [PATCH] cfq-iosch... |
1587 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
1588 |
} |
1da177e4c Linux-2.6.12-rc2 |
1589 1590 |
static void cfq_completed_request(request_queue_t *q, struct request *rq) { |
5e7053747 [PATCH] cfq-iosch... |
1591 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
1592 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
1593 |
const int sync = rq_is_sync(rq); |
b4878f245 [PATCH] 02/05: up... |
1594 |
unsigned long now; |
1da177e4c Linux-2.6.12-rc2 |
1595 |
|
b4878f245 [PATCH] 02/05: up... |
1596 |
now = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
1597 |
|
b4878f245 [PATCH] 02/05: up... |
1598 1599 1600 1601 |
WARN_ON(!cfqd->rq_in_driver); WARN_ON(!cfqq->on_dispatch[sync]); cfqd->rq_in_driver--; cfqq->on_dispatch[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
1602 |
|
b4878f245 [PATCH] 02/05: up... |
1603 1604 |
if (!cfq_class_idle(cfqq)) cfqd->last_end_request = now; |
3b18152c3 [PATCH] CFQ io sc... |
1605 |
|
53b03744e [PATCH] cfq-iosch... |
1606 1607 |
if (!cfq_cfqq_dispatched(cfqq) && cfq_cfqq_on_rr(cfqq)) cfq_resort_rr_list(cfqq, 0); |
1da177e4c Linux-2.6.12-rc2 |
1608 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1609 |
if (sync) |
5e7053747 [PATCH] cfq-iosch... |
1610 |
RQ_CIC(rq)->last_end_request = now; |
caaa5f9f0 [PATCH] cfq-iosch... |
1611 1612 1613 1614 1615 1616 1617 1618 |
/* * 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) { if (time_after(now, cfqq->slice_end)) cfq_slice_expired(cfqd, 0); |
dd67d0515 [PATCH] rbtree: s... |
1619 |
else if (sync && RB_EMPTY_ROOT(&cfqq->sort_list)) { |
caaa5f9f0 [PATCH] cfq-iosch... |
1620 1621 1622 1623 |
if (!cfq_arm_slice_timer(cfqd, cfqq)) cfq_schedule_dispatch(cfqd); } } |
1da177e4c Linux-2.6.12-rc2 |
1624 |
} |
22e2c507c [PATCH] Update cf... |
1625 1626 1627 1628 1629 |
/* * 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 |
1630 |
{ |
22e2c507c [PATCH] Update cf... |
1631 1632 |
const int ioprio_class = cfqq->ioprio_class; const int ioprio = cfqq->ioprio; |
1da177e4c Linux-2.6.12-rc2 |
1633 |
|
22e2c507c [PATCH] Update cf... |
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 |
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 { /* * check if we need to unboost the queue */ if (cfqq->ioprio_class != cfqq->org_ioprio_class) cfqq->ioprio_class = cfqq->org_ioprio_class; if (cfqq->ioprio != cfqq->org_ioprio) cfqq->ioprio = cfqq->org_ioprio; } |
1da177e4c Linux-2.6.12-rc2 |
1652 |
|
22e2c507c [PATCH] Update cf... |
1653 1654 1655 1656 |
/* * refile between round-robin lists if we moved the priority class */ if ((ioprio_class != cfqq->ioprio_class || ioprio != cfqq->ioprio) && |
3b18152c3 [PATCH] CFQ io sc... |
1657 |
cfq_cfqq_on_rr(cfqq)) |
22e2c507c [PATCH] Update cf... |
1658 1659 |
cfq_resort_rr_list(cfqq, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1660 |
|
89850f7ee [PATCH] cfq-iosch... |
1661 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
1662 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
1663 |
if ((cfq_cfqq_wait_request(cfqq) || cfq_cfqq_must_alloc(cfqq)) && |
99f95e528 [PATCH] cfq build... |
1664 |
!cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
1665 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
1666 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
1667 |
} |
1da177e4c Linux-2.6.12-rc2 |
1668 |
|
22e2c507c [PATCH] Update cf... |
1669 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
1670 |
} |
cb78b285c [PATCH] Drop usel... |
1671 |
static int cfq_may_queue(request_queue_t *q, int rw) |
22e2c507c [PATCH] Update cf... |
1672 1673 1674 1675 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; struct cfq_queue *cfqq; |
7749a8d42 [PATCH] Propagate... |
1676 1677 1678 |
unsigned int key; key = cfq_queue_pid(tsk, rw, rw & REQ_RW_SYNC); |
22e2c507c [PATCH] Update cf... |
1679 1680 1681 1682 1683 1684 1685 |
/* * 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 */ |
7749a8d42 [PATCH] Propagate... |
1686 |
cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio); |
22e2c507c [PATCH] Update cf... |
1687 1688 1689 |
if (cfqq) { cfq_init_prio_data(cfqq); cfq_prio_boost(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
1690 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
1691 1692 1693 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
1694 |
} |
1da177e4c Linux-2.6.12-rc2 |
1695 1696 1697 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
1698 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1699 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1700 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
1701 |
|
5e7053747 [PATCH] cfq-iosch... |
1702 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
1703 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
1704 |
|
22e2c507c [PATCH] Update cf... |
1705 1706 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
1707 |
|
5e7053747 [PATCH] cfq-iosch... |
1708 |
put_io_context(RQ_CIC(rq)->ioc); |
1da177e4c Linux-2.6.12-rc2 |
1709 |
|
1da177e4c Linux-2.6.12-rc2 |
1710 |
rq->elevator_private = NULL; |
5e7053747 [PATCH] cfq-iosch... |
1711 |
rq->elevator_private2 = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1712 |
|
1da177e4c Linux-2.6.12-rc2 |
1713 1714 1715 1716 1717 |
cfq_put_queue(cfqq); } } /* |
22e2c507c [PATCH] Update cf... |
1718 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
1719 |
*/ |
22e2c507c [PATCH] Update cf... |
1720 |
static int |
cb78b285c [PATCH] Drop usel... |
1721 |
cfq_set_request(request_queue_t *q, struct request *rq, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1722 1723 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
1724 |
struct task_struct *tsk = current; |
1da177e4c Linux-2.6.12-rc2 |
1725 1726 |
struct cfq_io_context *cic; const int rw = rq_data_dir(rq); |
7749a8d42 [PATCH] Propagate... |
1727 1728 |
const int is_sync = rq_is_sync(rq); pid_t key = cfq_queue_pid(tsk, rw, is_sync); |
22e2c507c [PATCH] Update cf... |
1729 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1730 1731 1732 |
unsigned long flags; might_sleep_if(gfp_mask & __GFP_WAIT); |
e2d74ac06 [PATCH] [BLOCK] c... |
1733 |
cic = cfq_get_io_context(cfqd, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1734 |
|
1da177e4c Linux-2.6.12-rc2 |
1735 |
spin_lock_irqsave(q->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
1736 1737 |
if (!cic) goto queue_fail; |
12a057321 [PATCH] keep sync... |
1738 |
if (!cic->cfqq[is_sync]) { |
6f325a134 [PATCH] fix cfq_g... |
1739 |
cfqq = cfq_get_queue(cfqd, key, tsk, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1740 1741 |
if (!cfqq) goto queue_fail; |
1da177e4c Linux-2.6.12-rc2 |
1742 |
|
12a057321 [PATCH] keep sync... |
1743 |
cic->cfqq[is_sync] = cfqq; |
22e2c507c [PATCH] Update cf... |
1744 |
} else |
12a057321 [PATCH] keep sync... |
1745 |
cfqq = cic->cfqq[is_sync]; |
1da177e4c Linux-2.6.12-rc2 |
1746 1747 |
cfqq->allocated[rw]++; |
3b18152c3 [PATCH] CFQ io sc... |
1748 |
cfq_clear_cfqq_must_alloc(cfqq); |
22e2c507c [PATCH] Update cf... |
1749 |
atomic_inc(&cfqq->ref); |
1da177e4c Linux-2.6.12-rc2 |
1750 |
|
5e7053747 [PATCH] cfq-iosch... |
1751 |
spin_unlock_irqrestore(q->queue_lock, flags); |
3b18152c3 [PATCH] CFQ io sc... |
1752 |
|
5e7053747 [PATCH] cfq-iosch... |
1753 1754 1755 |
rq->elevator_private = cic; rq->elevator_private2 = cfqq; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1756 |
|
22e2c507c [PATCH] Update cf... |
1757 1758 1759 |
queue_fail: if (cic) put_io_context(cic->ioc); |
89850f7ee [PATCH] cfq-iosch... |
1760 |
|
3b18152c3 [PATCH] CFQ io sc... |
1761 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
1762 1763 1764 |
spin_unlock_irqrestore(q->queue_lock, flags); return 1; } |
65f27f384 WorkStruct: Pass ... |
1765 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
1766 |
{ |
65f27f384 WorkStruct: Pass ... |
1767 1768 1769 |
struct cfq_data *cfqd = container_of(work, struct cfq_data, unplug_work); request_queue_t *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
1770 1771 1772 |
unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); |
dc72ef4ae [PATCH] Add blk_s... |
1773 |
blk_start_queueing(q); |
22e2c507c [PATCH] Update cf... |
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 |
spin_unlock_irqrestore(q->queue_lock, flags); } /* * 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; spin_lock_irqsave(cfqd->queue->queue_lock, flags); if ((cfqq = cfqd->active_queue) != NULL) { unsigned long now = jiffies; /* * expired */ if (time_after(now, cfqq->slice_end)) goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
1801 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
1802 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
1803 1804 1805 1806 |
/* * not expired and it has a request pending, let it dispatch */ |
dd67d0515 [PATCH] rbtree: s... |
1807 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) { |
3b18152c3 [PATCH] CFQ io sc... |
1808 |
cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1809 1810 1811 1812 1813 1814 |
goto out_kick; } } expire: cfq_slice_expired(cfqd, 0); out_kick: |
3b18152c3 [PATCH] CFQ io sc... |
1815 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 |
out_cont: spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } /* * Timer running if an idle class queue is waiting for service */ static void cfq_idle_class_timer(unsigned long data) { struct cfq_data *cfqd = (struct cfq_data *) data; unsigned long flags, end; spin_lock_irqsave(cfqd->queue->queue_lock, flags); /* * race with a non-idle queue, reset timer */ end = cfqd->last_end_request + CFQ_IDLE_GRACE; |
ae818a38d [PATCH] cfq-iosch... |
1834 1835 1836 |
if (!time_after_eq(jiffies, end)) mod_timer(&cfqd->idle_class_timer, end); else |
3b18152c3 [PATCH] CFQ io sc... |
1837 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
1838 1839 1840 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
3b18152c3 [PATCH] CFQ io sc... |
1841 1842 1843 1844 1845 1846 |
static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) { del_timer_sync(&cfqd->idle_slice_timer); del_timer_sync(&cfqd->idle_class_timer); blk_sync_queue(cfqd->queue); } |
22e2c507c [PATCH] Update cf... |
1847 |
|
1da177e4c Linux-2.6.12-rc2 |
1848 1849 |
static void cfq_exit_queue(elevator_t *e) { |
22e2c507c [PATCH] Update cf... |
1850 |
struct cfq_data *cfqd = e->elevator_data; |
d9ff41879 [PATCH] make cfq_... |
1851 |
request_queue_t *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
1852 |
|
3b18152c3 [PATCH] CFQ io sc... |
1853 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
1854 |
|
d9ff41879 [PATCH] make cfq_... |
1855 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
1856 |
|
d9ff41879 [PATCH] make cfq_... |
1857 1858 |
if (cfqd->active_queue) __cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
1859 1860 |
while (!list_empty(&cfqd->cic_list)) { |
d9ff41879 [PATCH] make cfq_... |
1861 1862 1863 |
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next, struct cfq_io_context, queue_list); |
89850f7ee [PATCH] cfq-iosch... |
1864 1865 |
__cfq_exit_single_io_context(cfqd, cic); |
d9ff41879 [PATCH] make cfq_... |
1866 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1867 |
|
d9ff41879 [PATCH] make cfq_... |
1868 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
1869 1870 |
cfq_shutdown_timer_wq(cfqd); |
a90d742e4 [PATCH] don't bot... |
1871 1872 |
kfree(cfqd->cfq_hash); kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
1873 |
} |
bb37b94c6 [BLOCK] Cleanup u... |
1874 |
static void *cfq_init_queue(request_queue_t *q) |
1da177e4c Linux-2.6.12-rc2 |
1875 1876 1877 |
{ struct cfq_data *cfqd; int i; |
b5deef901 [PATCH] Make sure... |
1878 |
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL, q->node); |
1da177e4c Linux-2.6.12-rc2 |
1879 |
if (!cfqd) |
bc1c11697 [PATCH] elevator ... |
1880 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1881 1882 |
memset(cfqd, 0, sizeof(*cfqd)); |
22e2c507c [PATCH] Update cf... |
1883 1884 1885 1886 1887 1888 1889 |
for (i = 0; i < CFQ_PRIO_LISTS; i++) INIT_LIST_HEAD(&cfqd->rr_list[i]); INIT_LIST_HEAD(&cfqd->busy_rr); INIT_LIST_HEAD(&cfqd->cur_rr); INIT_LIST_HEAD(&cfqd->idle_rr); |
d9ff41879 [PATCH] make cfq_... |
1890 |
INIT_LIST_HEAD(&cfqd->cic_list); |
1da177e4c Linux-2.6.12-rc2 |
1891 |
|
b5deef901 [PATCH] Make sure... |
1892 |
cfqd->cfq_hash = kmalloc_node(sizeof(struct hlist_head) * CFQ_QHASH_ENTRIES, GFP_KERNEL, q->node); |
1da177e4c Linux-2.6.12-rc2 |
1893 |
if (!cfqd->cfq_hash) |
5e7053747 [PATCH] cfq-iosch... |
1894 |
goto out_free; |
1da177e4c Linux-2.6.12-rc2 |
1895 |
|
1da177e4c Linux-2.6.12-rc2 |
1896 1897 |
for (i = 0; i < CFQ_QHASH_ENTRIES; i++) INIT_HLIST_HEAD(&cfqd->cfq_hash[i]); |
1da177e4c Linux-2.6.12-rc2 |
1898 |
cfqd->queue = q; |
1da177e4c Linux-2.6.12-rc2 |
1899 |
|
22e2c507c [PATCH] Update cf... |
1900 1901 1902 1903 1904 1905 1906 |
init_timer(&cfqd->idle_slice_timer); cfqd->idle_slice_timer.function = cfq_idle_slice_timer; cfqd->idle_slice_timer.data = (unsigned long) cfqd; init_timer(&cfqd->idle_class_timer); cfqd->idle_class_timer.function = cfq_idle_class_timer; cfqd->idle_class_timer.data = (unsigned long) cfqd; |
65f27f384 WorkStruct: Pass ... |
1907 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
1908 |
|
1da177e4c Linux-2.6.12-rc2 |
1909 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
1910 1911 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
1912 1913 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
1914 1915 1916 1917 |
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; |
3b18152c3 [PATCH] CFQ io sc... |
1918 |
|
bc1c11697 [PATCH] elevator ... |
1919 |
return cfqd; |
5e7053747 [PATCH] cfq-iosch... |
1920 |
out_free: |
1da177e4c Linux-2.6.12-rc2 |
1921 |
kfree(cfqd); |
bc1c11697 [PATCH] elevator ... |
1922 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1923 1924 1925 1926 |
} static void cfq_slab_kill(void) { |
1da177e4c Linux-2.6.12-rc2 |
1927 1928 1929 1930 1931 1932 1933 1934 |
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) { |
1da177e4c Linux-2.6.12-rc2 |
1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 |
cfq_pool = kmem_cache_create("cfq_pool", sizeof(struct cfq_queue), 0, 0, NULL, NULL); if (!cfq_pool) goto fail; cfq_ioc_pool = kmem_cache_create("cfq_ioc_pool", sizeof(struct cfq_io_context), 0, 0, NULL, NULL); if (!cfq_ioc_pool) goto fail; return 0; fail: cfq_slab_kill(); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
1950 1951 1952 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 |
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 |
1969 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
1970 |
static ssize_t __FUNC(elevator_t *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
1971 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
1972 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
1973 1974 1975 1976 1977 1978 |
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... |
1979 1980 |
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... |
1981 1982 |
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... |
1983 1984 1985 1986 |
SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1); 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); |
1da177e4c Linux-2.6.12-rc2 |
1987 1988 1989 |
#undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
1990 |
static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
1991 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
1992 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 |
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); |
22e2c507c [PATCH] Update cf... |
2006 2007 |
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... |
2008 2009 |
STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
2010 2011 2012 2013 |
STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1); 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); STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1, UINT_MAX, 0); |
1da177e4c Linux-2.6.12-rc2 |
2014 |
#undef STORE_FUNCTION |
e572ec7e4 [PATCH] fix rmmod... |
2015 2016 2017 2018 2019 |
#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... |
2020 2021 2022 2023 2024 2025 2026 2027 |
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), |
e572ec7e4 [PATCH] fix rmmod... |
2028 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
2029 |
}; |
1da177e4c Linux-2.6.12-rc2 |
2030 2031 2032 2033 2034 |
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, |
b4878f245 [PATCH] 02/05: up... |
2035 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
2036 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
2037 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
2038 2039 2040 |
.elevator_deactivate_req_fn = cfq_deactivate_request, .elevator_queue_empty_fn = cfq_queue_empty, .elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
2041 2042 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
1da177e4c Linux-2.6.12-rc2 |
2043 2044 2045 2046 2047 |
.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... |
2048 |
.trim = cfq_free_io_context, |
1da177e4c Linux-2.6.12-rc2 |
2049 |
}, |
3d1ab40f4 [PATCH] elevator_... |
2050 |
.elevator_attrs = cfq_attrs, |
1da177e4c Linux-2.6.12-rc2 |
2051 2052 2053 2054 2055 2056 2057 |
.elevator_name = "cfq", .elevator_owner = THIS_MODULE, }; static int __init cfq_init(void) { int ret; |
22e2c507c [PATCH] Update cf... |
2058 2059 2060 2061 2062 2063 2064 |
/* * could be 0 on HZ < 1000 setups */ if (!cfq_slice_async) cfq_slice_async = 1; if (!cfq_slice_idle) cfq_slice_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
2065 2066 2067 2068 |
if (cfq_slab_setup()) return -ENOMEM; ret = elv_register(&iosched_cfq); |
22e2c507c [PATCH] Update cf... |
2069 2070 |
if (ret) cfq_slab_kill(); |
1da177e4c Linux-2.6.12-rc2 |
2071 |
|
1da177e4c Linux-2.6.12-rc2 |
2072 2073 2074 2075 2076 |
return ret; } static void __exit cfq_exit(void) { |
6e9a4738c [PATCH] completio... |
2077 |
DECLARE_COMPLETION_ONSTACK(all_gone); |
1da177e4c Linux-2.6.12-rc2 |
2078 |
elv_unregister(&iosched_cfq); |
334e94de9 [PATCH] deal with... |
2079 |
ioc_gone = &all_gone; |
fba822722 [PATCH 1/2] iosch... |
2080 2081 |
/* ioc_gone's update must be visible before reading ioc_count */ smp_wmb(); |
4050cf167 [PATCH] cfq-iosch... |
2082 |
if (elv_ioc_count_read(ioc_count)) |
fba822722 [PATCH 1/2] iosch... |
2083 |
wait_for_completion(ioc_gone); |
334e94de9 [PATCH] deal with... |
2084 |
synchronize_rcu(); |
83521d3eb [PATCH] cfq-iosch... |
2085 |
cfq_slab_kill(); |
1da177e4c Linux-2.6.12-rc2 |
2086 2087 2088 2089 2090 2091 2092 2093 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |