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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. * * Copyright (C) 2003 Jens Axboe <axboe@suse.de> */ |
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#include <linux/config.h> #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 */ static const int cfq_queued = 8; /* minimum rq allocate limit per-queue*/ 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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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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static DEFINE_SPINLOCK(cfq_exit_lock); |
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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) /* * for the hash of crq inside the cfqq */ #define CFQ_MHASH_SHIFT 6 #define CFQ_MHASH_BLOCK(sec) ((sec) >> 3) #define CFQ_MHASH_ENTRIES (1 << CFQ_MHASH_SHIFT) #define CFQ_MHASH_FN(sec) hash_long(CFQ_MHASH_BLOCK(sec), CFQ_MHASH_SHIFT) #define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors) #define list_entry_hash(ptr) hlist_entry((ptr), struct cfq_rq, hash) #define list_entry_cfqq(ptr) list_entry((ptr), struct cfq_queue, cfq_list) |
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#define list_entry_fifo(ptr) list_entry((ptr), struct request, queuelist) |
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#define RQ_DATA(rq) (rq)->elevator_private /* * rb-tree defines */ |
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#define RB_EMPTY(node) ((node)->rb_node == NULL) |
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#define RB_CLEAR(node) do { \ |
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memset(node, 0, sizeof(*node)); \ |
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} while (0) #define RB_CLEAR_ROOT(root) ((root)->rb_node = NULL) |
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#define rb_entry_crq(node) rb_entry((node), struct cfq_rq, rb_node) #define rq_rb_key(rq) (rq)->sector |
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static kmem_cache_t *crq_pool; static kmem_cache_t *cfq_pool; static kmem_cache_t *cfq_ioc_pool; |
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static atomic_t ioc_count = ATOMIC_INIT(0); 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) #define cfq_class_be(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_BE) #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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#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; /* * non-ordered list of empty cfqq's */ |
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struct list_head empty_list; |
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/* * cfqq lookup hash */ |
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struct hlist_head *cfq_hash; |
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/* * global crq hash for all queues */ struct hlist_head *crq_hash; |
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mempool_t *crq_pool; |
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int rq_in_driver; |
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int hw_tag; |
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/* * schedule slice state info */ /* * idle window management */ struct timer_list idle_slice_timer; struct work_struct unplug_work; |
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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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unsigned int rq_starved; |
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/* * tunables, see top of file */ unsigned int cfq_quantum; unsigned int cfq_queued; |
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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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/* on either rr or empty list of cfqd */ struct list_head cfq_list; /* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ struct cfq_rq *next_crq; /* requests queued in sort_list */ int queued[2]; /* currently allocated requests */ int allocated[2]; /* fifo list of requests in sort_list */ |
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struct list_head fifo; |
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unsigned long slice_start; unsigned long slice_end; unsigned long slice_left; unsigned long service_last; |
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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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}; struct cfq_rq { struct rb_node rb_node; sector_t rb_key; struct request *request; struct hlist_node hash; struct cfq_queue *cfq_queue; struct cfq_io_context *io_context; |
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unsigned int crq_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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}; #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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#undef CFQ_CFQQ_FNS enum cfq_rq_state_flags { |
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CFQ_CRQ_FLAG_is_sync = 0, |
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}; #define CFQ_CRQ_FNS(name) \ static inline void cfq_mark_crq_##name(struct cfq_rq *crq) \ { \ crq->crq_flags |= (1 << CFQ_CRQ_FLAG_##name); \ } \ static inline void cfq_clear_crq_##name(struct cfq_rq *crq) \ { \ crq->crq_flags &= ~(1 << CFQ_CRQ_FLAG_##name); \ } \ static inline int cfq_crq_##name(const struct cfq_rq *crq) \ { \ return (crq->crq_flags & (1 << CFQ_CRQ_FLAG_##name)) != 0; \ } |
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CFQ_CRQ_FNS(is_sync); |
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#undef CFQ_CRQ_FNS 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 cfq_rq *); |
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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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/* * lots of deadline iosched dupes, can be abstracted later... */ static inline void cfq_del_crq_hash(struct cfq_rq *crq) { hlist_del_init(&crq->hash); } |
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static inline void cfq_add_crq_hash(struct cfq_data *cfqd, struct cfq_rq *crq) { const int hash_idx = CFQ_MHASH_FN(rq_hash_key(crq->request)); |
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hlist_add_head(&crq->hash, &cfqd->crq_hash[hash_idx]); } static struct request *cfq_find_rq_hash(struct cfq_data *cfqd, sector_t offset) { struct hlist_head *hash_list = &cfqd->crq_hash[CFQ_MHASH_FN(offset)]; struct hlist_node *entry, *next; hlist_for_each_safe(entry, next, hash_list) { struct cfq_rq *crq = list_entry_hash(entry); struct request *__rq = crq->request; |
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if (!rq_mergeable(__rq)) { cfq_del_crq_hash(crq); continue; } if (rq_hash_key(__rq) == offset) return __rq; } return NULL; } |
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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) { |
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if (rw == READ || rw == WRITE_SYNC) |
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return task->pid; return CFQ_KEY_ASYNC; } |
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/* * Lifted from AS - choose which of crq1 and crq2 that is best served now. * 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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*/ static struct cfq_rq * cfq_choose_req(struct cfq_data *cfqd, struct cfq_rq *crq1, struct cfq_rq *crq2) { 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 (crq1 == NULL || crq1 == crq2) return crq2; if (crq2 == NULL) return crq1; |
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if (cfq_crq_is_sync(crq1) && !cfq_crq_is_sync(crq2)) return crq1; else if (cfq_crq_is_sync(crq2) && !cfq_crq_is_sync(crq1)) |
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return crq2; |
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s1 = crq1->request->sector; s2 = crq2->request->sector; 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) { case 0: /* common case for CFQ: crq1 and crq2 not wrapped */ if (d1 < d2) |
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return crq1; |
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else if (d2 < d1) |
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return crq2; |
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else { if (s1 >= s2) return crq1; else return crq2; } |
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case CFQ_RQ2_WRAP: |
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return crq1; |
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case CFQ_RQ1_WRAP: |
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return crq2; |
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case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both crqs wrapped */ 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 crq1; else return crq2; } } /* * would be nice to take fifo expire time into account as well */ static struct cfq_rq * cfq_find_next_crq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct cfq_rq *last) { struct cfq_rq *crq_next = NULL, *crq_prev = NULL; struct rb_node *rbnext, *rbprev; |
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if (!(rbnext = rb_next(&last->rb_node))) { |
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rbnext = rb_first(&cfqq->sort_list); |
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if (rbnext == &last->rb_node) rbnext = NULL; } |
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rbprev = rb_prev(&last->rb_node); if (rbprev) crq_prev = rb_entry_crq(rbprev); if (rbnext) crq_next = rb_entry_crq(rbnext); return cfq_choose_req(cfqd, crq_next, crq_prev); } static void cfq_update_next_crq(struct cfq_rq *crq) { struct cfq_queue *cfqq = crq->cfq_queue; if (cfqq->next_crq == crq) cfqq->next_crq = cfq_find_next_crq(cfqq->cfqd, cfqq, crq); } |
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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; struct list_head *list, *entry; |
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BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
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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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/* * if queue was preempted, just add to front to be fair. busy_rr |
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* isn't sorted, but insert at the back for fairness. |
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*/ if (preempted || list == &cfqd->busy_rr) { |
b52a83489 [PATCH] cfq-iosch... |
476 477 478 479 |
if (preempted) list = list->prev; list_add_tail(&cfqq->cfq_list, list); |
1da177e4c Linux-2.6.12-rc2 |
480 |
return; |
22e2c507c [PATCH] Update cf... |
481 |
} |
1da177e4c Linux-2.6.12-rc2 |
482 483 |
/* |
22e2c507c [PATCH] Update cf... |
484 |
* sort by when queue was last serviced |
1da177e4c Linux-2.6.12-rc2 |
485 |
*/ |
22e2c507c [PATCH] Update cf... |
486 487 |
entry = list; while ((entry = entry->prev) != list) { |
1da177e4c Linux-2.6.12-rc2 |
488 |
struct cfq_queue *__cfqq = list_entry_cfqq(entry); |
22e2c507c [PATCH] Update cf... |
489 490 491 |
if (!__cfqq->service_last) break; if (time_before(__cfqq->service_last, cfqq->service_last)) |
1da177e4c Linux-2.6.12-rc2 |
492 |
break; |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 496 497 498 499 |
} list_add(&cfqq->cfq_list, entry); } /* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
500 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
501 502 |
*/ static inline void |
b4878f245 [PATCH] 02/05: up... |
503 |
cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
504 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
505 506 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
507 |
cfqd->busy_queues++; |
b4878f245 [PATCH] 02/05: up... |
508 |
cfq_resort_rr_list(cfqq, 0); |
1da177e4c Linux-2.6.12-rc2 |
509 510 511 512 513 |
} static inline void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
3b18152c3 [PATCH] CFQ io sc... |
514 515 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
22e2c507c [PATCH] Update cf... |
516 |
list_move(&cfqq->cfq_list, &cfqd->empty_list); |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 520 521 522 523 524 525 526 527 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; } /* * rb tree support functions */ static inline void cfq_del_crq_rb(struct cfq_rq *crq) { struct cfq_queue *cfqq = crq->cfq_queue; |
b4878f245 [PATCH] 02/05: up... |
528 529 |
struct cfq_data *cfqd = cfqq->cfqd; const int sync = cfq_crq_is_sync(crq); |
1da177e4c Linux-2.6.12-rc2 |
530 |
|
b4878f245 [PATCH] 02/05: up... |
531 532 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
533 |
|
b4878f245 [PATCH] 02/05: up... |
534 |
cfq_update_next_crq(crq); |
1da177e4c Linux-2.6.12-rc2 |
535 |
|
b4878f245 [PATCH] 02/05: up... |
536 |
rb_erase(&crq->rb_node, &cfqq->sort_list); |
1da177e4c Linux-2.6.12-rc2 |
537 |
|
b4878f245 [PATCH] 02/05: up... |
538 539 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY(&cfqq->sort_list)) cfq_del_cfqq_rr(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 |
} static struct cfq_rq * __cfq_add_crq_rb(struct cfq_rq *crq) { struct rb_node **p = &crq->cfq_queue->sort_list.rb_node; struct rb_node *parent = NULL; struct cfq_rq *__crq; while (*p) { parent = *p; __crq = rb_entry_crq(parent); if (crq->rb_key < __crq->rb_key) p = &(*p)->rb_left; else if (crq->rb_key > __crq->rb_key) p = &(*p)->rb_right; else return __crq; } rb_link_node(&crq->rb_node, parent, p); return NULL; } static void cfq_add_crq_rb(struct cfq_rq *crq) { struct cfq_queue *cfqq = crq->cfq_queue; struct cfq_data *cfqd = cfqq->cfqd; struct request *rq = crq->request; struct cfq_rq *__alias; crq->rb_key = rq_rb_key(rq); |
3b18152c3 [PATCH] CFQ io sc... |
573 |
cfqq->queued[cfq_crq_is_sync(crq)]++; |
1da177e4c Linux-2.6.12-rc2 |
574 575 576 577 578 579 |
/* * looks a little odd, but the first insert might return an alias. * if that happens, put the alias on the dispatch list */ while ((__alias = __cfq_add_crq_rb(crq)) != NULL) |
b4878f245 [PATCH] 02/05: up... |
580 |
cfq_dispatch_insert(cfqd->queue, __alias); |
1da177e4c Linux-2.6.12-rc2 |
581 582 |
rb_insert_color(&crq->rb_node, &cfqq->sort_list); |
3b18152c3 [PATCH] CFQ io sc... |
583 |
if (!cfq_cfqq_on_rr(cfqq)) |
b4878f245 [PATCH] 02/05: up... |
584 |
cfq_add_cfqq_rr(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
585 586 587 588 589 590 591 592 593 594 |
/* * check if this request is a better next-serve candidate */ cfqq->next_crq = cfq_choose_req(cfqd, cfqq->next_crq, crq); } static inline void cfq_reposition_crq_rb(struct cfq_queue *cfqq, struct cfq_rq *crq) { |
b4878f245 [PATCH] 02/05: up... |
595 596 |
rb_erase(&crq->rb_node, &cfqq->sort_list); cfqq->queued[cfq_crq_is_sync(crq)]--; |
1da177e4c Linux-2.6.12-rc2 |
597 598 599 |
cfq_add_crq_rb(crq); } |
206dc69b3 [BLOCK] cfq-iosch... |
600 601 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
602 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
603 604 605 |
struct task_struct *tsk = current; pid_t key = cfq_queue_pid(tsk, bio_data_dir(bio)); struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
606 |
struct rb_node *n; |
206dc69b3 [BLOCK] cfq-iosch... |
607 |
sector_t sector; |
1da177e4c Linux-2.6.12-rc2 |
608 |
|
206dc69b3 [BLOCK] cfq-iosch... |
609 |
cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio); |
1da177e4c Linux-2.6.12-rc2 |
610 611 |
if (!cfqq) goto out; |
206dc69b3 [BLOCK] cfq-iosch... |
612 |
sector = bio->bi_sector + bio_sectors(bio); |
1da177e4c Linux-2.6.12-rc2 |
613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 |
n = cfqq->sort_list.rb_node; while (n) { struct cfq_rq *crq = rb_entry_crq(n); if (sector < crq->rb_key) n = n->rb_left; else if (sector > crq->rb_key) n = n->rb_right; else return crq->request; } out: return NULL; } |
b4878f245 [PATCH] 02/05: up... |
628 |
static void cfq_activate_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
629 |
{ |
22e2c507c [PATCH] Update cf... |
630 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
631 |
|
b4878f245 [PATCH] 02/05: up... |
632 |
cfqd->rq_in_driver++; |
25776e359 [PATCH] cfq-iosch... |
633 634 635 636 637 638 639 640 641 |
/* * 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 |
642 |
} |
b4878f245 [PATCH] 02/05: up... |
643 |
static void cfq_deactivate_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
644 |
{ |
b4878f245 [PATCH] 02/05: up... |
645 646 647 648 |
struct cfq_data *cfqd = q->elevator->elevator_data; WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
1da177e4c Linux-2.6.12-rc2 |
649 |
} |
b4878f245 [PATCH] 02/05: up... |
650 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
651 652 |
{ struct cfq_rq *crq = RQ_DATA(rq); |
b4878f245 [PATCH] 02/05: up... |
653 654 |
list_del_init(&rq->queuelist); cfq_del_crq_rb(crq); |
98b11471d [PATCH] 04/05 rem... |
655 |
cfq_del_crq_hash(crq); |
1da177e4c Linux-2.6.12-rc2 |
656 657 658 659 660 661 662 663 |
} 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; int ret; |
1da177e4c Linux-2.6.12-rc2 |
664 |
__rq = cfq_find_rq_hash(cfqd, bio->bi_sector); |
22e2c507c [PATCH] Update cf... |
665 666 667 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { ret = ELEVATOR_BACK_MERGE; goto out; |
1da177e4c Linux-2.6.12-rc2 |
668 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
669 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
22e2c507c [PATCH] Update cf... |
670 671 672 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { ret = ELEVATOR_FRONT_MERGE; goto out; |
1da177e4c Linux-2.6.12-rc2 |
673 674 675 676 |
} return ELEVATOR_NO_MERGE; out: |
1da177e4c Linux-2.6.12-rc2 |
677 678 679 680 681 682 683 684 685 686 687 |
*req = __rq; return ret; } static void cfq_merged_request(request_queue_t *q, struct request *req) { struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_rq *crq = RQ_DATA(req); cfq_del_crq_hash(crq); cfq_add_crq_hash(cfqd, crq); |
b4878f245 [PATCH] 02/05: up... |
688 |
if (rq_rb_key(req) != crq->rb_key) { |
1da177e4c Linux-2.6.12-rc2 |
689 690 691 692 693 |
struct cfq_queue *cfqq = crq->cfq_queue; cfq_update_next_crq(crq); cfq_reposition_crq_rb(cfqq, crq); } |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 698 699 |
} static void cfq_merged_requests(request_queue_t *q, struct request *rq, struct request *next) { |
1da177e4c Linux-2.6.12-rc2 |
700 |
cfq_merged_request(q, rq); |
22e2c507c [PATCH] Update cf... |
701 702 703 704 705 706 |
/* * 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... |
707 |
cfq_remove_request(next); |
22e2c507c [PATCH] Update cf... |
708 709 710 711 712 713 714 715 716 717 718 719 720 721 |
} 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... |
722 723 |
cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); |
22e2c507c [PATCH] Update cf... |
724 725 726 727 728 729 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
* 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); if (!preempted && !cfq_cfqq_dispatched(cfqq)) { cfqq->service_last = now; cfq_schedule_dispatch(cfqd); } cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); /* * 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... |
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 |
* 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 |
814 |
} |
22e2c507c [PATCH] Update cf... |
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 |
} 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 |
832 |
} |
22e2c507c [PATCH] Update cf... |
833 834 |
return prio; } |
3b18152c3 [PATCH] CFQ io sc... |
835 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
836 |
{ |
7b14e3b52 [PATCH] cfq-iosch... |
837 |
struct cfq_queue *cfqq = NULL; |
22e2c507c [PATCH] Update cf... |
838 839 840 841 842 843 844 845 846 |
/* * 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 */ if (!list_empty(&cfqd->cur_rr) || cfq_get_next_prio_level(cfqd) != -1) cfqq = list_entry_cfqq(cfqd->cur_rr.next); /* |
e0de0206a [PATCH] cfq-iosch... |
847 848 849 850 851 852 853 |
* If no new queues are available, check if the busy list has some * before falling back to idle io. */ if (!cfqq && !list_empty(&cfqd->busy_rr)) cfqq = list_entry_cfqq(cfqd->busy_rr.next); /* |
22e2c507c [PATCH] Update cf... |
854 855 856 857 858 859 860 861 862 863 864 865 866 867 |
* 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 */ if (!cfqq && !list_empty(&cfqd->idle_rr)) { 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... |
868 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
869 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
870 |
#define CIC_SEEKY(cic) ((cic)->seek_mean > (128 * 1024)) |
22e2c507c [PATCH] Update cf... |
871 872 873 |
static int cfq_arm_slice_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
206dc69b3 [BLOCK] cfq-iosch... |
874 |
struct cfq_io_context *cic; |
7b14e3b52 [PATCH] cfq-iosch... |
875 |
unsigned long sl; |
22e2c507c [PATCH] Update cf... |
876 877 878 879 880 881 882 883 |
WARN_ON(!RB_EMPTY(&cfqq->sort_list)); 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... |
884 |
if (!cfq_cfqq_idle_window(cfqq)) |
22e2c507c [PATCH] Update cf... |
885 886 887 888 |
return 0; /* * task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
889 890 |
cic = cfqd->active_cic; if (!cic || !cic->ioc->task) |
22e2c507c [PATCH] Update cf... |
891 |
return 0; |
3b18152c3 [PATCH] CFQ io sc... |
892 893 |
cfq_mark_cfqq_must_dispatch(cfqq); cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
894 |
|
7b14e3b52 [PATCH] cfq-iosch... |
895 |
sl = min(cfqq->slice_end - 1, (unsigned long) cfqd->cfq_slice_idle); |
206dc69b3 [BLOCK] cfq-iosch... |
896 897 898 899 900 901 |
/* * 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... |
902 |
if (sample_valid(cic->seek_samples) && CIC_SEEKY(cic)) |
206dc69b3 [BLOCK] cfq-iosch... |
903 |
sl = 2; |
7b14e3b52 [PATCH] cfq-iosch... |
904 |
mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
22e2c507c [PATCH] Update cf... |
905 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
906 |
} |
b4878f245 [PATCH] 02/05: up... |
907 |
static void cfq_dispatch_insert(request_queue_t *q, struct cfq_rq *crq) |
1da177e4c Linux-2.6.12-rc2 |
908 909 910 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_queue *cfqq = crq->cfq_queue; |
fd61af038 [PATCH] cfq-iosch... |
911 |
struct request *rq; |
22e2c507c [PATCH] Update cf... |
912 913 |
cfqq->next_crq = cfq_find_next_crq(cfqd, cfqq, crq); |
b4878f245 [PATCH] 02/05: up... |
914 |
cfq_remove_request(crq->request); |
3b18152c3 [PATCH] CFQ io sc... |
915 |
cfqq->on_dispatch[cfq_crq_is_sync(crq)]++; |
b4878f245 [PATCH] 02/05: up... |
916 |
elv_dispatch_sort(q, crq->request); |
fd61af038 [PATCH] cfq-iosch... |
917 918 919 |
rq = list_entry(q->queue_head.prev, struct request, queuelist); cfqd->last_sector = rq->sector + rq->nr_sectors; |
1da177e4c Linux-2.6.12-rc2 |
920 921 922 923 924 925 926 927 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ static inline struct cfq_rq *cfq_check_fifo(struct cfq_queue *cfqq) { struct cfq_data *cfqd = cfqq->cfqd; |
22e2c507c [PATCH] Update cf... |
928 |
struct request *rq; |
1da177e4c Linux-2.6.12-rc2 |
929 |
struct cfq_rq *crq; |
3b18152c3 [PATCH] CFQ io sc... |
930 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
931 |
return NULL; |
22e2c507c [PATCH] Update cf... |
932 |
if (!list_empty(&cfqq->fifo)) { |
3b18152c3 [PATCH] CFQ io sc... |
933 |
int fifo = cfq_cfqq_class_sync(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
934 |
|
22e2c507c [PATCH] Update cf... |
935 936 937 |
crq = RQ_DATA(list_entry_fifo(cfqq->fifo.next)); rq = crq->request; if (time_after(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo])) { |
3b18152c3 [PATCH] CFQ io sc... |
938 |
cfq_mark_cfqq_fifo_expire(cfqq); |
22e2c507c [PATCH] Update cf... |
939 940 |
return crq; } |
1da177e4c Linux-2.6.12-rc2 |
941 942 943 944 945 946 |
} return NULL; } /* |
3b18152c3 [PATCH] CFQ io sc... |
947 948 949 |
* 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 |
950 |
*/ |
22e2c507c [PATCH] Update cf... |
951 952 953 954 955 956 957 958 959 |
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 |
960 |
static inline void |
22e2c507c [PATCH] Update cf... |
961 |
cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
962 |
{ |
22e2c507c [PATCH] Update cf... |
963 964 |
cfqq->slice_end = cfq_prio_to_slice(cfqd, cfqq) + jiffies; } |
1da177e4c Linux-2.6.12-rc2 |
965 |
|
22e2c507c [PATCH] Update cf... |
966 967 968 969 |
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 |
970 |
|
22e2c507c [PATCH] Update cf... |
971 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
972 |
|
22e2c507c [PATCH] Update cf... |
973 |
return 2 * (base_rq + base_rq * (CFQ_PRIO_LISTS - 1 - cfqq->ioprio)); |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
22e2c507c [PATCH] Update cf... |
975 976 977 |
/* * get next queue for service */ |
1b5ed5e1f [BLOCK] cfq-iosch... |
978 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
979 |
{ |
22e2c507c [PATCH] Update cf... |
980 |
unsigned long now = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
981 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
982 |
|
22e2c507c [PATCH] Update cf... |
983 984 985 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
986 |
|
22e2c507c [PATCH] Update cf... |
987 988 989 |
/* * slice has expired */ |
3b18152c3 [PATCH] CFQ io sc... |
990 991 |
if (!cfq_cfqq_must_dispatch(cfqq) && time_after(now, cfqq->slice_end)) goto expire; |
1da177e4c Linux-2.6.12-rc2 |
992 |
|
22e2c507c [PATCH] Update cf... |
993 994 995 996 997 998 |
/* * if queue has requests, dispatch one. if not, check if * enough slice is left to wait for one */ if (!RB_EMPTY(&cfqq->sort_list)) goto keep_queue; |
caaa5f9f0 [PATCH] cfq-iosch... |
999 1000 1001 1002 |
else if (cfq_cfqq_dispatched(cfqq)) { cfqq = NULL; goto keep_queue; } else if (cfq_cfqq_class_sync(cfqq)) { |
22e2c507c [PATCH] Update cf... |
1003 1004 1005 |
if (cfq_arm_slice_timer(cfqd, cfqq)) return NULL; } |
3b18152c3 [PATCH] CFQ io sc... |
1006 |
expire: |
22e2c507c [PATCH] Update cf... |
1007 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
1008 1009 |
new_queue: cfqq = cfq_set_active_queue(cfqd); |
22e2c507c [PATCH] Update cf... |
1010 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
1011 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 |
} static int __cfq_dispatch_requests(struct cfq_data *cfqd, struct cfq_queue *cfqq, int max_dispatch) { int dispatched = 0; BUG_ON(RB_EMPTY(&cfqq->sort_list)); do { struct cfq_rq *crq; |
1da177e4c Linux-2.6.12-rc2 |
1024 1025 |
/* |
22e2c507c [PATCH] Update cf... |
1026 |
* follow expired path, else get first next available |
1da177e4c Linux-2.6.12-rc2 |
1027 |
*/ |
22e2c507c [PATCH] Update cf... |
1028 1029 1030 1031 1032 1033 |
if ((crq = cfq_check_fifo(cfqq)) == NULL) crq = cfqq->next_crq; /* * finally, insert request into driver dispatch list */ |
b4878f245 [PATCH] 02/05: up... |
1034 |
cfq_dispatch_insert(cfqd->queue, crq); |
1da177e4c Linux-2.6.12-rc2 |
1035 |
|
22e2c507c [PATCH] Update cf... |
1036 1037 |
cfqd->dispatch_slice++; dispatched++; |
1da177e4c Linux-2.6.12-rc2 |
1038 |
|
22e2c507c [PATCH] Update cf... |
1039 1040 1041 1042 |
if (!cfqd->active_cic) { atomic_inc(&crq->io_context->ioc->refcount); cfqd->active_cic = crq->io_context; } |
1da177e4c Linux-2.6.12-rc2 |
1043 |
|
22e2c507c [PATCH] Update cf... |
1044 1045 1046 1047 1048 1049 |
if (RB_EMPTY(&cfqq->sort_list)) break; } while (dispatched < max_dispatch); /* |
caaa5f9f0 [PATCH] cfq-iosch... |
1050 |
* if slice end isn't set yet, set it. |
22e2c507c [PATCH] Update cf... |
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
*/ 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... |
1061 1062 |
cfq_class_idle(cfqq) || !cfq_cfqq_idle_window(cfqq)) |
22e2c507c [PATCH] Update cf... |
1063 1064 1065 1066 1067 1068 |
cfq_slice_expired(cfqd, 0); return dispatched; } static int |
1b5ed5e1f [BLOCK] cfq-iosch... |
1069 1070 |
cfq_forced_dispatch_cfqqs(struct list_head *list) { |
1b5ed5e1f [BLOCK] cfq-iosch... |
1071 1072 |
struct cfq_queue *cfqq, *next; struct cfq_rq *crq; |
caaa5f9f0 [PATCH] cfq-iosch... |
1073 |
int dispatched; |
1b5ed5e1f [BLOCK] cfq-iosch... |
1074 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1075 |
dispatched = 0; |
1b5ed5e1f [BLOCK] cfq-iosch... |
1076 1077 1078 1079 1080 1081 1082 |
list_for_each_entry_safe(cfqq, next, list, cfq_list) { while ((crq = cfqq->next_crq)) { cfq_dispatch_insert(cfqq->cfqd->queue, crq); dispatched++; } BUG_ON(!list_empty(&cfqq->fifo)); } |
caaa5f9f0 [PATCH] cfq-iosch... |
1083 |
|
1b5ed5e1f [BLOCK] cfq-iosch... |
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 |
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... |
1107 |
cfq_dispatch_requests(request_queue_t *q, int force) |
22e2c507c [PATCH] Update cf... |
1108 1109 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
caaa5f9f0 [PATCH] cfq-iosch... |
1110 1111 |
struct cfq_queue *cfqq, *prev_cfqq; int dispatched; |
22e2c507c [PATCH] Update cf... |
1112 1113 1114 |
if (!cfqd->busy_queues) return 0; |
1b5ed5e1f [BLOCK] cfq-iosch... |
1115 1116 |
if (unlikely(force)) return cfq_forced_dispatch(cfqd); |
caaa5f9f0 [PATCH] cfq-iosch... |
1117 1118 1119 |
dispatched = 0; prev_cfqq = NULL; while ((cfqq = cfq_select_queue(cfqd)) != NULL) { |
b4878f245 [PATCH] 02/05: up... |
1120 |
int max_dispatch; |
caaa5f9f0 [PATCH] cfq-iosch... |
1121 1122 1123 1124 1125 |
/* * Don't repeat dispatch from the previous queue. */ if (prev_cfqq == cfqq) break; |
3b18152c3 [PATCH] CFQ io sc... |
1126 1127 |
cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
1128 |
del_timer(&cfqd->idle_slice_timer); |
1b5ed5e1f [BLOCK] cfq-iosch... |
1129 1130 1131 |
max_dispatch = cfqd->cfq_quantum; if (cfq_class_idle(cfqq)) max_dispatch = 1; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 |
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 |
1143 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1144 |
return dispatched; |
1da177e4c Linux-2.6.12-rc2 |
1145 |
} |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 1149 1150 1151 1152 1153 |
/* * task holds one reference to the queue, dropped when task exits. each crq * in-flight on this queue also holds a reference, dropped when crq is freed. * * queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
1154 1155 1156 |
struct cfq_data *cfqd = cfqq->cfqd; BUG_ON(atomic_read(&cfqq->ref) <= 0); |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 1159 1160 1161 |
if (!atomic_dec_and_test(&cfqq->ref)) return; BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
1162 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
3b18152c3 [PATCH] CFQ io sc... |
1163 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
1164 |
|
7b14e3b52 [PATCH] cfq-iosch... |
1165 |
if (unlikely(cfqd->active_queue == cfqq)) |
3b18152c3 [PATCH] CFQ io sc... |
1166 |
__cfq_slice_expired(cfqd, cfqq, 0); |
22e2c507c [PATCH] Update cf... |
1167 |
|
1da177e4c Linux-2.6.12-rc2 |
1168 1169 1170 1171 1172 1173 1174 1175 1176 |
/* * 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); } static inline struct cfq_queue * |
3b18152c3 [PATCH] CFQ io sc... |
1177 1178 |
__cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned int prio, const int hashval) |
1da177e4c Linux-2.6.12-rc2 |
1179 1180 |
{ struct hlist_head *hash_list = &cfqd->cfq_hash[hashval]; |
206dc69b3 [BLOCK] cfq-iosch... |
1181 1182 |
struct hlist_node *entry; struct cfq_queue *__cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1183 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1184 |
hlist_for_each_entry(__cfqq, entry, hash_list, cfq_hash) { |
b0a6916bc [PATCH] fix cfq h... |
1185 |
const unsigned short __p = IOPRIO_PRIO_VALUE(__cfqq->org_ioprio_class, __cfqq->org_ioprio); |
1da177e4c Linux-2.6.12-rc2 |
1186 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1187 |
if (__cfqq->key == key && (__p == prio || !prio)) |
1da177e4c Linux-2.6.12-rc2 |
1188 1189 1190 1191 1192 1193 1194 |
return __cfqq; } return NULL; } static struct cfq_queue * |
3b18152c3 [PATCH] CFQ io sc... |
1195 |
cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned short prio) |
1da177e4c Linux-2.6.12-rc2 |
1196 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
1197 |
return __cfq_find_cfq_hash(cfqd, key, prio, hash_long(key, CFQ_QHASH_SHIFT)); |
1da177e4c Linux-2.6.12-rc2 |
1198 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1199 |
static void cfq_free_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1200 |
{ |
22e2c507c [PATCH] Update cf... |
1201 |
struct cfq_io_context *__cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1202 1203 |
struct rb_node *n; int freed = 0; |
1da177e4c Linux-2.6.12-rc2 |
1204 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1205 1206 1207 |
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... |
1208 |
kmem_cache_free(cfq_ioc_pool, __cic); |
334e94de9 [PATCH] deal with... |
1209 |
freed++; |
1da177e4c Linux-2.6.12-rc2 |
1210 |
} |
334e94de9 [PATCH] deal with... |
1211 1212 |
if (atomic_sub_and_test(freed, &ioc_count) && ioc_gone) complete(ioc_gone); |
1da177e4c Linux-2.6.12-rc2 |
1213 |
} |
e17a9489b [PATCH] stop elv_... |
1214 1215 1216 |
static void cfq_trim(struct io_context *ioc) { ioc->set_ioprio = NULL; |
e2d74ac06 [PATCH] [BLOCK] c... |
1217 |
cfq_free_io_context(ioc); |
e17a9489b [PATCH] stop elv_... |
1218 |
} |
22e2c507c [PATCH] Update cf... |
1219 1220 1221 1222 |
/* * Called with interrupts disabled */ static void cfq_exit_single_io_context(struct cfq_io_context *cic) |
1da177e4c Linux-2.6.12-rc2 |
1223 |
{ |
478a82b0e [PATCH] switch to... |
1224 |
struct cfq_data *cfqd = cic->key; |
d9ff41879 [PATCH] make cfq_... |
1225 1226 1227 1228 1229 1230 |
request_queue_t *q; if (!cfqd) return; q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
1231 1232 1233 1234 |
WARN_ON(!irqs_disabled()); spin_lock(q->queue_lock); |
12a057321 [PATCH] keep sync... |
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 |
if (cic->cfqq[ASYNC]) { if (unlikely(cic->cfqq[ASYNC] == cfqd->active_queue)) __cfq_slice_expired(cfqd, cic->cfqq[ASYNC], 0); cfq_put_queue(cic->cfqq[ASYNC]); cic->cfqq[ASYNC] = NULL; } if (cic->cfqq[SYNC]) { if (unlikely(cic->cfqq[SYNC] == cfqd->active_queue)) __cfq_slice_expired(cfqd, cic->cfqq[SYNC], 0); cfq_put_queue(cic->cfqq[SYNC]); cic->cfqq[SYNC] = NULL; } |
22e2c507c [PATCH] Update cf... |
1248 |
|
478a82b0e [PATCH] switch to... |
1249 |
cic->key = NULL; |
d9ff41879 [PATCH] make cfq_... |
1250 |
list_del_init(&cic->queue_list); |
22e2c507c [PATCH] Update cf... |
1251 |
spin_unlock(q->queue_lock); |
1da177e4c Linux-2.6.12-rc2 |
1252 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1253 |
static void cfq_exit_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1254 |
{ |
22e2c507c [PATCH] Update cf... |
1255 |
struct cfq_io_context *__cic; |
1da177e4c Linux-2.6.12-rc2 |
1256 |
unsigned long flags; |
e2d74ac06 [PATCH] [BLOCK] c... |
1257 |
struct rb_node *n; |
22e2c507c [PATCH] Update cf... |
1258 |
|
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 |
/* * put the reference this task is holding to the various queues */ |
3793c65c1 [PATCH] cfq-iosch... |
1262 |
spin_lock_irqsave(&cfq_exit_lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
1263 1264 1265 1266 |
n = rb_first(&ioc->cic_root); while (n != NULL) { __cic = rb_entry(n, struct cfq_io_context, rb_node); |
22e2c507c [PATCH] Update cf... |
1267 |
cfq_exit_single_io_context(__cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1268 |
n = rb_next(n); |
1da177e4c Linux-2.6.12-rc2 |
1269 |
} |
3793c65c1 [PATCH] cfq-iosch... |
1270 |
spin_unlock_irqrestore(&cfq_exit_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1271 |
} |
22e2c507c [PATCH] Update cf... |
1272 |
static struct cfq_io_context * |
8267e268e [PATCH] gfp_t: bl... |
1273 |
cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1274 |
{ |
22e2c507c [PATCH] Update cf... |
1275 |
struct cfq_io_context *cic = kmem_cache_alloc(cfq_ioc_pool, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 |
if (cic) { |
553698f94 [PATCH] cfq-iosch... |
1278 |
memset(cic, 0, sizeof(*cic)); |
22e2c507c [PATCH] Update cf... |
1279 |
cic->last_end_request = jiffies; |
553698f94 [PATCH] cfq-iosch... |
1280 |
INIT_LIST_HEAD(&cic->queue_list); |
22e2c507c [PATCH] Update cf... |
1281 1282 |
cic->dtor = cfq_free_io_context; cic->exit = cfq_exit_io_context; |
334e94de9 [PATCH] deal with... |
1283 |
atomic_inc(&ioc_count); |
1da177e4c Linux-2.6.12-rc2 |
1284 1285 1286 1287 |
} return cic; } |
22e2c507c [PATCH] Update cf... |
1288 1289 1290 1291 |
static void cfq_init_prio_data(struct cfq_queue *cfqq) { struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
1292 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 |
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... |
1318 |
cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1319 1320 1321 1322 1323 1324 1325 1326 1327 |
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... |
1328 |
if (cfq_cfqq_on_rr(cfqq)) |
22e2c507c [PATCH] Update cf... |
1329 |
cfq_resort_rr_list(cfqq, 0); |
3b18152c3 [PATCH] CFQ io sc... |
1330 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
1331 |
} |
478a82b0e [PATCH] switch to... |
1332 |
static inline void changed_ioprio(struct cfq_io_context *cic) |
22e2c507c [PATCH] Update cf... |
1333 |
{ |
478a82b0e [PATCH] switch to... |
1334 1335 |
struct cfq_data *cfqd = cic->key; struct cfq_queue *cfqq; |
35e6077cb [PATCH] cfq-iosch... |
1336 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 |
if (unlikely(!cfqd)) return; spin_lock(cfqd->queue->queue_lock); 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... |
1351 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1352 1353 1354 1355 1356 1357 |
cfqq = cic->cfqq[SYNC]; if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); spin_unlock(cfqd->queue->queue_lock); |
22e2c507c [PATCH] Update cf... |
1358 1359 1360 1361 1362 1363 1364 |
} /* * callback from sys_ioprio_set, irqs are disabled */ static int cfq_ioc_set_ioprio(struct io_context *ioc, unsigned int ioprio) { |
a6a0763a6 [PATCH] fix the e... |
1365 |
struct cfq_io_context *cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1366 |
struct rb_node *n; |
a6a0763a6 [PATCH] fix the e... |
1367 |
|
3793c65c1 [PATCH] cfq-iosch... |
1368 |
spin_lock(&cfq_exit_lock); |
a6a0763a6 [PATCH] fix the e... |
1369 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1370 1371 1372 |
n = rb_first(&ioc->cic_root); while (n != NULL) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
3793c65c1 [PATCH] cfq-iosch... |
1373 |
|
478a82b0e [PATCH] switch to... |
1374 |
changed_ioprio(cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1375 1376 |
n = rb_next(n); } |
22e2c507c [PATCH] Update cf... |
1377 |
|
3793c65c1 [PATCH] cfq-iosch... |
1378 |
spin_unlock(&cfq_exit_lock); |
a6a0763a6 [PATCH] fix the e... |
1379 |
|
22e2c507c [PATCH] Update cf... |
1380 1381 1382 1383 |
return 0; } static struct cfq_queue * |
6f325a134 [PATCH] fix cfq_g... |
1384 |
cfq_get_queue(struct cfq_data *cfqd, unsigned int key, struct task_struct *tsk, |
8267e268e [PATCH] gfp_t: bl... |
1385 |
gfp_t gfp_mask) |
22e2c507c [PATCH] Update cf... |
1386 1387 1388 |
{ const int hashval = hash_long(key, CFQ_QHASH_SHIFT); struct cfq_queue *cfqq, *new_cfqq = NULL; |
6f325a134 [PATCH] fix cfq_g... |
1389 |
unsigned short ioprio; |
22e2c507c [PATCH] Update cf... |
1390 1391 |
retry: |
6f325a134 [PATCH] fix cfq_g... |
1392 |
ioprio = tsk->ioprio; |
3b18152c3 [PATCH] CFQ io sc... |
1393 |
cfqq = __cfq_find_cfq_hash(cfqd, key, ioprio, hashval); |
22e2c507c [PATCH] Update cf... |
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
if (!cfqq) { if (new_cfqq) { cfqq = new_cfqq; new_cfqq = NULL; } else if (gfp_mask & __GFP_WAIT) { spin_unlock_irq(cfqd->queue->queue_lock); new_cfqq = kmem_cache_alloc(cfq_pool, gfp_mask); spin_lock_irq(cfqd->queue->queue_lock); goto retry; } else { cfqq = kmem_cache_alloc(cfq_pool, gfp_mask); if (!cfqq) goto out; } memset(cfqq, 0, sizeof(*cfqq)); INIT_HLIST_NODE(&cfqq->cfq_hash); INIT_LIST_HEAD(&cfqq->cfq_list); RB_CLEAR_ROOT(&cfqq->sort_list); 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... |
1421 1422 1423 1424 1425 |
cfqq->service_last = 0; /* * set ->slice_left to allow preemption for a new process */ cfqq->slice_left = 2 * cfqd->cfq_slice_idle; |
caaa5f9f0 [PATCH] cfq-iosch... |
1426 |
cfq_mark_cfqq_idle_window(cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
1427 1428 |
cfq_mark_cfqq_prio_changed(cfqq); cfq_init_prio_data(cfqq); |
22e2c507c [PATCH] Update cf... |
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 |
} 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: ... |
1439 1440 1441 |
static void cfq_drop_dead_cic(struct io_context *ioc, struct cfq_io_context *cic) { |
3793c65c1 [PATCH] cfq-iosch... |
1442 |
spin_lock(&cfq_exit_lock); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1443 |
rb_erase(&cic->rb_node, &ioc->cic_root); |
3793c65c1 [PATCH] cfq-iosch... |
1444 1445 |
list_del_init(&cic->queue_list); spin_unlock(&cfq_exit_lock); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1446 1447 1448 |
kmem_cache_free(cfq_ioc_pool, cic); atomic_dec(&ioc_count); } |
e2d74ac06 [PATCH] [BLOCK] c... |
1449 1450 1451 |
static struct cfq_io_context * cfq_cic_rb_lookup(struct cfq_data *cfqd, struct io_context *ioc) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1452 |
struct rb_node *n; |
e2d74ac06 [PATCH] [BLOCK] c... |
1453 |
struct cfq_io_context *cic; |
be3b07535 [PATCH] cfq: Furt... |
1454 |
void *k, *key = cfqd; |
e2d74ac06 [PATCH] [BLOCK] c... |
1455 |
|
dbecf3ab4 [PATCH 2/2] cfq: ... |
1456 1457 |
restart: n = ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1458 1459 |
while (n) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1460 1461 1462 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = cic->key; if (unlikely(!k)) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1463 1464 1465 |
cfq_drop_dead_cic(ioc, cic); goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1466 |
|
be3b07535 [PATCH] cfq: Furt... |
1467 |
if (key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1468 |
n = n->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1469 |
else if (key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 |
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: ... |
1482 1483 |
struct rb_node **p; struct rb_node *parent; |
e2d74ac06 [PATCH] [BLOCK] c... |
1484 |
struct cfq_io_context *__cic; |
be3b07535 [PATCH] cfq: Furt... |
1485 |
void *k; |
e2d74ac06 [PATCH] [BLOCK] c... |
1486 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1487 1488 1489 1490 |
cic->ioc = ioc; cic->key = cfqd; ioc->set_ioprio = cfq_ioc_set_ioprio; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1491 1492 1493 |
restart: parent = NULL; p = &ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1494 1495 1496 |
while (*p) { parent = *p; __cic = rb_entry(parent, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1497 1498 1499 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = __cic->key; if (unlikely(!k)) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1500 1501 1502 |
cfq_drop_dead_cic(ioc, cic); goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1503 |
|
be3b07535 [PATCH] cfq: Furt... |
1504 |
if (cic->key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1505 |
p = &(*p)->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1506 |
else if (cic->key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1507 1508 1509 1510 |
p = &(*p)->rb_right; else BUG(); } |
3793c65c1 [PATCH] cfq-iosch... |
1511 |
spin_lock(&cfq_exit_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
1512 1513 1514 |
rb_link_node(&cic->rb_node, parent, p); rb_insert_color(&cic->rb_node, &ioc->cic_root); list_add(&cic->queue_list, &cfqd->cic_list); |
3793c65c1 [PATCH] cfq-iosch... |
1515 |
spin_unlock(&cfq_exit_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
1516 |
} |
1da177e4c Linux-2.6.12-rc2 |
1517 1518 1519 |
/* * 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... |
1520 |
* than one device managed by cfq. |
1da177e4c Linux-2.6.12-rc2 |
1521 1522 |
*/ static struct cfq_io_context * |
e2d74ac06 [PATCH] [BLOCK] c... |
1523 |
cfq_get_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1524 |
{ |
22e2c507c [PATCH] Update cf... |
1525 |
struct io_context *ioc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1526 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
1527 |
|
22e2c507c [PATCH] Update cf... |
1528 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
1da177e4c Linux-2.6.12-rc2 |
1529 |
|
22e2c507c [PATCH] Update cf... |
1530 |
ioc = get_io_context(gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1531 1532 |
if (!ioc) return NULL; |
e2d74ac06 [PATCH] [BLOCK] c... |
1533 1534 1535 |
cic = cfq_cic_rb_lookup(cfqd, ioc); if (cic) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1536 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1537 1538 1539 |
cic = cfq_alloc_io_context(cfqd, gfp_mask); if (cic == NULL) goto err; |
1da177e4c Linux-2.6.12-rc2 |
1540 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1541 |
cfq_cic_link(cfqd, ioc, cic); |
1da177e4c Linux-2.6.12-rc2 |
1542 |
out: |
1da177e4c Linux-2.6.12-rc2 |
1543 1544 1545 1546 1547 |
return cic; err: put_io_context(ioc); return NULL; } |
22e2c507c [PATCH] Update cf... |
1548 1549 |
static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic) |
1da177e4c Linux-2.6.12-rc2 |
1550 |
{ |
22e2c507c [PATCH] Update cf... |
1551 |
unsigned long elapsed, ttime; |
1da177e4c Linux-2.6.12-rc2 |
1552 |
|
22e2c507c [PATCH] Update cf... |
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 |
/* * 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 |
1565 |
|
22e2c507c [PATCH] Update cf... |
1566 |
ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle); |
db3b5848e When cfq I/O sche... |
1567 |
|
22e2c507c [PATCH] Update cf... |
1568 1569 1570 1571 |
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 |
1572 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 |
static void cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic, struct cfq_rq *crq) { sector_t sdist; u64 total; if (cic->last_request_pos < crq->request->sector) sdist = crq->request->sector - cic->last_request_pos; else sdist = cic->last_request_pos - crq->request->sector; /* * 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 |
1600 |
|
22e2c507c [PATCH] Update cf... |
1601 1602 1603 1604 1605 1606 1607 1608 |
/* * 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... |
1609 |
int enable_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1610 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1611 1612 |
if (!cic->ioc->task || !cfqd->cfq_slice_idle || (cfqd->hw_tag && CIC_SEEKY(cic))) |
22e2c507c [PATCH] Update cf... |
1613 1614 1615 1616 1617 1618 |
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 |
1619 |
} |
3b18152c3 [PATCH] CFQ io sc... |
1620 1621 1622 1623 |
if (enable_idle) cfq_mark_cfqq_idle_window(cfqq); else cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1624 |
} |
1da177e4c Linux-2.6.12-rc2 |
1625 |
|
22e2c507c [PATCH] Update cf... |
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 |
/* * 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, struct cfq_rq *crq) { struct cfq_queue *cfqq = cfqd->active_queue; if (cfq_class_idle(new_cfqq)) return 0; if (!cfqq) |
caaa5f9f0 [PATCH] cfq-iosch... |
1641 |
return 0; |
22e2c507c [PATCH] Update cf... |
1642 1643 1644 |
if (cfq_class_idle(cfqq)) return 1; |
3b18152c3 [PATCH] CFQ io sc... |
1645 |
if (!cfq_cfqq_wait_request(new_cfqq)) |
22e2c507c [PATCH] Update cf... |
1646 1647 1648 1649 1650 1651 |
return 0; /* * if it doesn't have slice left, forget it */ if (new_cfqq->slice_left < cfqd->cfq_slice_idle) return 0; |
3b18152c3 [PATCH] CFQ io sc... |
1652 |
if (cfq_crq_is_sync(crq) && !cfq_cfqq_sync(cfqq)) |
22e2c507c [PATCH] Update cf... |
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 |
return 1; 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) { struct cfq_queue *__cfqq, *next; list_for_each_entry_safe(__cfqq, next, &cfqd->cur_rr, cfq_list) cfq_resort_rr_list(__cfqq, 1); if (!cfqq->slice_left) cfqq->slice_left = cfq_prio_to_slice(cfqd, cfqq) / 2; cfqq->slice_end = cfqq->slice_left + jiffies; |
caaa5f9f0 [PATCH] cfq-iosch... |
1673 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 |
__cfq_set_active_queue(cfqd, cfqq); } /* * should really be a ll_rw_blk.c helper */ static void cfq_start_queueing(struct cfq_data *cfqd, struct cfq_queue *cfqq) { request_queue_t *q = cfqd->queue; if (!blk_queue_plugged(q)) q->request_fn(q); else __generic_unplug_device(q); } /* * Called when a new fs request (crq) is added (to cfqq). Check if there's * something we should do about it */ static void cfq_crq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct cfq_rq *crq) { |
fd61af038 [PATCH] cfq-iosch... |
1698 |
struct cfq_io_context *cic = crq->io_context; |
12e9fddd6 [PATCH] cfq-iosch... |
1699 |
|
9c2c38a12 [PATCH] cfq-iosch... |
1700 1701 1702 1703 |
/* * we never wait for an async request and we don't allow preemption * of an async request. so just return early */ |
12e9fddd6 [PATCH] cfq-iosch... |
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 |
if (!cfq_crq_is_sync(crq)) { /* * 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); cfq_start_queueing(cfqd, cfqq); } |
9c2c38a12 [PATCH] cfq-iosch... |
1714 |
return; |
12e9fddd6 [PATCH] cfq-iosch... |
1715 |
} |
22e2c507c [PATCH] Update cf... |
1716 |
|
9c2c38a12 [PATCH] cfq-iosch... |
1717 |
cfq_update_io_thinktime(cfqd, cic); |
206dc69b3 [BLOCK] cfq-iosch... |
1718 |
cfq_update_io_seektime(cfqd, cic, crq); |
9c2c38a12 [PATCH] cfq-iosch... |
1719 1720 1721 |
cfq_update_idle_window(cfqd, cfqq, cic); cic->last_queue = jiffies; |
206dc69b3 [BLOCK] cfq-iosch... |
1722 |
cic->last_request_pos = crq->request->sector + crq->request->nr_sectors; |
22e2c507c [PATCH] Update cf... |
1723 1724 1725 1726 1727 1728 1729 |
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... |
1730 1731 |
if (cfq_cfqq_wait_request(cfqq)) { cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 |
del_timer(&cfqd->idle_slice_timer); cfq_start_queueing(cfqd, cfqq); } } else if (cfq_should_preempt(cfqd, cfqq, crq)) { /* * 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... |
1742 |
cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1743 1744 |
cfq_start_queueing(cfqd, cfqq); } |
1da177e4c Linux-2.6.12-rc2 |
1745 |
} |
b4878f245 [PATCH] 02/05: up... |
1746 |
static void cfq_insert_request(request_queue_t *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1747 |
{ |
b4878f245 [PATCH] 02/05: up... |
1748 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
22e2c507c [PATCH] Update cf... |
1749 1750 1751 1752 |
struct cfq_rq *crq = RQ_DATA(rq); struct cfq_queue *cfqq = crq->cfq_queue; cfq_init_prio_data(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1753 1754 |
cfq_add_crq_rb(crq); |
1da177e4c Linux-2.6.12-rc2 |
1755 |
|
22e2c507c [PATCH] Update cf... |
1756 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
98b11471d [PATCH] 04/05 rem... |
1757 |
if (rq_mergeable(rq)) |
22e2c507c [PATCH] Update cf... |
1758 |
cfq_add_crq_hash(cfqd, crq); |
22e2c507c [PATCH] Update cf... |
1759 |
cfq_crq_enqueued(cfqd, cfqq, crq); |
1da177e4c Linux-2.6.12-rc2 |
1760 |
} |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 1763 |
static void cfq_completed_request(request_queue_t *q, struct request *rq) { struct cfq_rq *crq = RQ_DATA(rq); |
b4878f245 [PATCH] 02/05: up... |
1764 1765 1766 1767 |
struct cfq_queue *cfqq = crq->cfq_queue; struct cfq_data *cfqd = cfqq->cfqd; const int sync = cfq_crq_is_sync(crq); unsigned long now; |
1da177e4c Linux-2.6.12-rc2 |
1768 |
|
b4878f245 [PATCH] 02/05: up... |
1769 |
now = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
1770 |
|
b4878f245 [PATCH] 02/05: up... |
1771 1772 1773 1774 |
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 |
1775 |
|
b4878f245 [PATCH] 02/05: up... |
1776 1777 |
if (!cfq_class_idle(cfqq)) cfqd->last_end_request = now; |
3b18152c3 [PATCH] CFQ io sc... |
1778 |
|
b4878f245 [PATCH] 02/05: up... |
1779 1780 1781 1782 1783 |
if (!cfq_cfqq_dispatched(cfqq)) { if (cfq_cfqq_on_rr(cfqq)) { cfqq->service_last = now; cfq_resort_rr_list(cfqq, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1784 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1785 |
if (sync) |
b4878f245 [PATCH] 02/05: up... |
1786 |
crq->io_context->last_end_request = now; |
caaa5f9f0 [PATCH] cfq-iosch... |
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 |
/* * 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); else if (sync && RB_EMPTY(&cfqq->sort_list)) { if (!cfq_arm_slice_timer(cfqd, cfqq)) cfq_schedule_dispatch(cfqd); } } |
1da177e4c Linux-2.6.12-rc2 |
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 |
} static struct request * cfq_former_request(request_queue_t *q, struct request *rq) { struct cfq_rq *crq = RQ_DATA(rq); struct rb_node *rbprev = rb_prev(&crq->rb_node); if (rbprev) return rb_entry_crq(rbprev)->request; return NULL; } static struct request * cfq_latter_request(request_queue_t *q, struct request *rq) { struct cfq_rq *crq = RQ_DATA(rq); struct rb_node *rbnext = rb_next(&crq->rb_node); if (rbnext) return rb_entry_crq(rbnext)->request; return NULL; } |
22e2c507c [PATCH] Update cf... |
1825 1826 1827 1828 1829 |
/* * 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 |
1830 |
{ |
22e2c507c [PATCH] Update cf... |
1831 1832 |
const int ioprio_class = cfqq->ioprio_class; const int ioprio = cfqq->ioprio; |
1da177e4c Linux-2.6.12-rc2 |
1833 |
|
22e2c507c [PATCH] Update cf... |
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 |
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 |
1852 |
|
22e2c507c [PATCH] Update cf... |
1853 1854 1855 1856 |
/* * 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... |
1857 |
cfq_cfqq_on_rr(cfqq)) |
22e2c507c [PATCH] Update cf... |
1858 1859 |
cfq_resort_rr_list(cfqq, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1860 |
|
22e2c507c [PATCH] Update cf... |
1861 1862 1863 1864 |
static inline int __cfq_may_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct task_struct *task, int rw) { |
3b18152c3 [PATCH] CFQ io sc... |
1865 |
if ((cfq_cfqq_wait_request(cfqq) || cfq_cfqq_must_alloc(cfqq)) && |
99f95e528 [PATCH] cfq build... |
1866 |
!cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
1867 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
1868 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
1869 |
} |
1da177e4c Linux-2.6.12-rc2 |
1870 |
|
22e2c507c [PATCH] Update cf... |
1871 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 |
} static int cfq_may_queue(request_queue_t *q, int rw, struct bio *bio) { struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; struct cfq_queue *cfqq; /* * don't force setup of a queue from here, as a call to may_queue * does not necessarily imply that a request actually will be queued. * so just lookup a possibly existing queue, or return 'may queue' * if that fails */ |
3b18152c3 [PATCH] CFQ io sc... |
1886 |
cfqq = cfq_find_cfq_hash(cfqd, cfq_queue_pid(tsk, rw), tsk->ioprio); |
22e2c507c [PATCH] Update cf... |
1887 1888 1889 1890 1891 1892 1893 1894 |
if (cfqq) { cfq_init_prio_data(cfqq); cfq_prio_boost(cfqq); return __cfq_may_queue(cfqd, cfqq, tsk, rw); } return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
1895 1896 1897 1898 |
} static void cfq_check_waiters(request_queue_t *q, struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
1899 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
1da177e4c Linux-2.6.12-rc2 |
1900 |
|
271f18f10 [PATCH] cfq-iosch... |
1901 1902 |
if (unlikely(cfqd->rq_starved)) { struct request_list *rl = &q->rq; |
22e2c507c [PATCH] Update cf... |
1903 1904 1905 |
smp_mb(); if (waitqueue_active(&rl->wait[READ])) wake_up(&rl->wait[READ]); |
22e2c507c [PATCH] Update cf... |
1906 1907 1908 |
if (waitqueue_active(&rl->wait[WRITE])) wake_up(&rl->wait[WRITE]); } |
1da177e4c Linux-2.6.12-rc2 |
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 |
} /* * queue lock held here */ static void cfq_put_request(request_queue_t *q, struct request *rq) { struct cfq_data *cfqd = q->elevator->elevator_data; struct cfq_rq *crq = RQ_DATA(rq); if (crq) { struct cfq_queue *cfqq = crq->cfq_queue; |
22e2c507c [PATCH] Update cf... |
1921 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
1922 |
|
22e2c507c [PATCH] Update cf... |
1923 1924 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
1925 |
|
22e2c507c [PATCH] Update cf... |
1926 |
put_io_context(crq->io_context->ioc); |
1da177e4c Linux-2.6.12-rc2 |
1927 1928 1929 |
mempool_free(crq, cfqd->crq_pool); rq->elevator_private = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1930 1931 1932 1933 1934 1935 |
cfq_check_waiters(q, cfqq); cfq_put_queue(cfqq); } } /* |
22e2c507c [PATCH] Update cf... |
1936 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
1937 |
*/ |
22e2c507c [PATCH] Update cf... |
1938 1939 |
static int cfq_set_request(request_queue_t *q, struct request *rq, struct bio *bio, |
8267e268e [PATCH] gfp_t: bl... |
1940 |
gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1941 1942 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
1943 |
struct task_struct *tsk = current; |
1da177e4c Linux-2.6.12-rc2 |
1944 1945 |
struct cfq_io_context *cic; const int rw = rq_data_dir(rq); |
3b18152c3 [PATCH] CFQ io sc... |
1946 |
pid_t key = cfq_queue_pid(tsk, rw); |
22e2c507c [PATCH] Update cf... |
1947 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1948 1949 |
struct cfq_rq *crq; unsigned long flags; |
12a057321 [PATCH] keep sync... |
1950 |
int is_sync = key != CFQ_KEY_ASYNC; |
1da177e4c Linux-2.6.12-rc2 |
1951 1952 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
e2d74ac06 [PATCH] [BLOCK] c... |
1953 |
cic = cfq_get_io_context(cfqd, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1954 |
|
1da177e4c Linux-2.6.12-rc2 |
1955 |
spin_lock_irqsave(q->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
1956 1957 |
if (!cic) goto queue_fail; |
12a057321 [PATCH] keep sync... |
1958 |
if (!cic->cfqq[is_sync]) { |
6f325a134 [PATCH] fix cfq_g... |
1959 |
cfqq = cfq_get_queue(cfqd, key, tsk, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1960 1961 |
if (!cfqq) goto queue_fail; |
1da177e4c Linux-2.6.12-rc2 |
1962 |
|
12a057321 [PATCH] keep sync... |
1963 |
cic->cfqq[is_sync] = cfqq; |
22e2c507c [PATCH] Update cf... |
1964 |
} else |
12a057321 [PATCH] keep sync... |
1965 |
cfqq = cic->cfqq[is_sync]; |
1da177e4c Linux-2.6.12-rc2 |
1966 1967 |
cfqq->allocated[rw]++; |
3b18152c3 [PATCH] CFQ io sc... |
1968 |
cfq_clear_cfqq_must_alloc(cfqq); |
22e2c507c [PATCH] Update cf... |
1969 1970 |
cfqd->rq_starved = 0; atomic_inc(&cfqq->ref); |
1da177e4c Linux-2.6.12-rc2 |
1971 |
spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1972 1973 1974 1975 1976 1977 1978 1979 |
crq = mempool_alloc(cfqd->crq_pool, gfp_mask); if (crq) { RB_CLEAR(&crq->rb_node); crq->rb_key = 0; crq->request = rq; INIT_HLIST_NODE(&crq->hash); crq->cfq_queue = cfqq; crq->io_context = cic; |
3b18152c3 [PATCH] CFQ io sc... |
1980 |
|
12a057321 [PATCH] keep sync... |
1981 |
if (is_sync) |
3b18152c3 [PATCH] CFQ io sc... |
1982 1983 1984 |
cfq_mark_crq_is_sync(crq); else cfq_clear_crq_is_sync(crq); |
1da177e4c Linux-2.6.12-rc2 |
1985 |
rq->elevator_private = crq; |
1da177e4c Linux-2.6.12-rc2 |
1986 1987 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1988 1989 |
spin_lock_irqsave(q->queue_lock, flags); cfqq->allocated[rw]--; |
22e2c507c [PATCH] Update cf... |
1990 |
if (!(cfqq->allocated[0] + cfqq->allocated[1])) |
3b18152c3 [PATCH] CFQ io sc... |
1991 |
cfq_mark_cfqq_must_alloc(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1992 |
cfq_put_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
1993 1994 1995 1996 1997 1998 1999 2000 2001 |
queue_fail: if (cic) put_io_context(cic->ioc); /* * mark us rq allocation starved. we need to kickstart the process * ourselves if there are no pending requests that can do it for us. * that would be an extremely rare OOM situation */ cfqd->rq_starved = 1; |
3b18152c3 [PATCH] CFQ io sc... |
2002 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
2003 2004 2005 |
spin_unlock_irqrestore(q->queue_lock, flags); return 1; } |
22e2c507c [PATCH] Update cf... |
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 |
static void cfq_kick_queue(void *data) { request_queue_t *q = data; struct cfq_data *cfqd = q->elevator->elevator_data; unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); if (cfqd->rq_starved) { struct request_list *rl = &q->rq; /* * we aren't guaranteed to get a request after this, but we * have to be opportunistic */ smp_mb(); if (waitqueue_active(&rl->wait[READ])) wake_up(&rl->wait[READ]); if (waitqueue_active(&rl->wait[WRITE])) wake_up(&rl->wait[WRITE]); } blk_remove_plug(q); q->request_fn(q); 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... |
2057 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
2058 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
2059 2060 2061 2062 2063 |
/* * not expired and it has a request pending, let it dispatch */ if (!RB_EMPTY(&cfqq->sort_list)) { |
3b18152c3 [PATCH] CFQ io sc... |
2064 |
cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
2065 2066 2067 2068 2069 2070 |
goto out_kick; } } expire: cfq_slice_expired(cfqd, 0); out_kick: |
3b18152c3 [PATCH] CFQ io sc... |
2071 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 |
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... |
2090 2091 2092 |
if (!time_after_eq(jiffies, end)) mod_timer(&cfqd->idle_class_timer, end); else |
3b18152c3 [PATCH] CFQ io sc... |
2093 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
2094 2095 2096 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
3b18152c3 [PATCH] CFQ io sc... |
2097 2098 2099 2100 2101 2102 |
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... |
2103 |
|
1da177e4c Linux-2.6.12-rc2 |
2104 2105 |
static void cfq_exit_queue(elevator_t *e) { |
22e2c507c [PATCH] Update cf... |
2106 |
struct cfq_data *cfqd = e->elevator_data; |
d9ff41879 [PATCH] make cfq_... |
2107 |
request_queue_t *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
2108 |
|
3b18152c3 [PATCH] CFQ io sc... |
2109 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
2110 |
|
3793c65c1 [PATCH] cfq-iosch... |
2111 |
spin_lock(&cfq_exit_lock); |
d9ff41879 [PATCH] make cfq_... |
2112 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
2113 |
|
d9ff41879 [PATCH] make cfq_... |
2114 2115 |
if (cfqd->active_queue) __cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
2116 2117 |
while (!list_empty(&cfqd->cic_list)) { |
d9ff41879 [PATCH] make cfq_... |
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 |
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next, struct cfq_io_context, queue_list); if (cic->cfqq[ASYNC]) { cfq_put_queue(cic->cfqq[ASYNC]); cic->cfqq[ASYNC] = NULL; } if (cic->cfqq[SYNC]) { cfq_put_queue(cic->cfqq[SYNC]); cic->cfqq[SYNC] = NULL; } cic->key = NULL; list_del_init(&cic->queue_list); } |
e2d74ac06 [PATCH] [BLOCK] c... |
2132 |
|
d9ff41879 [PATCH] make cfq_... |
2133 |
spin_unlock_irq(q->queue_lock); |
3793c65c1 [PATCH] cfq-iosch... |
2134 |
spin_unlock(&cfq_exit_lock); |
a90d742e4 [PATCH] don't bot... |
2135 2136 2137 2138 2139 2140 2141 |
cfq_shutdown_timer_wq(cfqd); mempool_destroy(cfqd->crq_pool); kfree(cfqd->crq_hash); kfree(cfqd->cfq_hash); kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
2142 |
} |
bc1c11697 [PATCH] elevator ... |
2143 |
static void *cfq_init_queue(request_queue_t *q, elevator_t *e) |
1da177e4c Linux-2.6.12-rc2 |
2144 2145 2146 2147 2148 2149 |
{ struct cfq_data *cfqd; int i; cfqd = kmalloc(sizeof(*cfqd), GFP_KERNEL); if (!cfqd) |
bc1c11697 [PATCH] elevator ... |
2150 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2151 2152 |
memset(cfqd, 0, sizeof(*cfqd)); |
22e2c507c [PATCH] Update cf... |
2153 2154 2155 2156 2157 2158 2159 |
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); |
1da177e4c Linux-2.6.12-rc2 |
2160 |
INIT_LIST_HEAD(&cfqd->empty_list); |
d9ff41879 [PATCH] make cfq_... |
2161 |
INIT_LIST_HEAD(&cfqd->cic_list); |
1da177e4c Linux-2.6.12-rc2 |
2162 2163 2164 2165 2166 2167 2168 2169 |
cfqd->crq_hash = kmalloc(sizeof(struct hlist_head) * CFQ_MHASH_ENTRIES, GFP_KERNEL); if (!cfqd->crq_hash) goto out_crqhash; cfqd->cfq_hash = kmalloc(sizeof(struct hlist_head) * CFQ_QHASH_ENTRIES, GFP_KERNEL); if (!cfqd->cfq_hash) goto out_cfqhash; |
93d2341c7 [PATCH] mempool: ... |
2170 |
cfqd->crq_pool = mempool_create_slab_pool(BLKDEV_MIN_RQ, crq_pool); |
1da177e4c Linux-2.6.12-rc2 |
2171 2172 2173 2174 2175 2176 2177 |
if (!cfqd->crq_pool) goto out_crqpool; for (i = 0; i < CFQ_MHASH_ENTRIES; i++) INIT_HLIST_HEAD(&cfqd->crq_hash[i]); for (i = 0; i < CFQ_QHASH_ENTRIES; i++) INIT_HLIST_HEAD(&cfqd->cfq_hash[i]); |
1da177e4c Linux-2.6.12-rc2 |
2178 |
cfqd->queue = q; |
1da177e4c Linux-2.6.12-rc2 |
2179 |
|
22e2c507c [PATCH] Update cf... |
2180 2181 2182 2183 2184 2185 2186 2187 2188 |
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; INIT_WORK(&cfqd->unplug_work, cfq_kick_queue, q); |
1da177e4c Linux-2.6.12-rc2 |
2189 2190 |
cfqd->cfq_queued = cfq_queued; cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
2191 2192 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
2193 2194 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
2195 2196 2197 2198 |
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... |
2199 |
|
bc1c11697 [PATCH] elevator ... |
2200 |
return cfqd; |
1da177e4c Linux-2.6.12-rc2 |
2201 2202 2203 2204 2205 2206 |
out_crqpool: kfree(cfqd->cfq_hash); out_cfqhash: kfree(cfqd->crq_hash); out_crqhash: kfree(cfqd); |
bc1c11697 [PATCH] elevator ... |
2207 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 |
} static void cfq_slab_kill(void) { if (crq_pool) kmem_cache_destroy(crq_pool); 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) { crq_pool = kmem_cache_create("crq_pool", sizeof(struct cfq_rq), 0, 0, NULL, NULL); if (!crq_pool) goto fail; 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 |
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/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
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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 |
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#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
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static ssize_t __FUNC(elevator_t *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
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{ \ |
3d1ab40f4 [PATCH] elevator_... |
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struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
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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); SHOW_FUNCTION(cfq_queued_show, cfqd->cfq_queued, 0); |
22e2c507c [PATCH] Update cf... |
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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... |
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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... |
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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 |
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#undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
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static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
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{ \ |
3d1ab40f4 [PATCH] elevator_... |
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struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
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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); STORE_FUNCTION(cfq_queued_store, &cfqd->cfq_queued, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
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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... |
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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... |
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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 |
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#undef STORE_FUNCTION |
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#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), CFQ_ATTR(queued), 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... |
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__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
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}; |
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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, |
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.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
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.elevator_add_req_fn = cfq_insert_request, |
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.elevator_activate_req_fn = cfq_activate_request, |
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.elevator_deactivate_req_fn = cfq_deactivate_request, .elevator_queue_empty_fn = cfq_queue_empty, .elevator_completed_req_fn = cfq_completed_request, .elevator_former_req_fn = cfq_former_request, .elevator_latter_req_fn = cfq_latter_request, .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, |
e17a9489b [PATCH] stop elv_... |
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.trim = cfq_trim, |
1da177e4c Linux-2.6.12-rc2 |
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}, |
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.elevator_attrs = cfq_attrs, |
1da177e4c Linux-2.6.12-rc2 |
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.elevator_name = "cfq", .elevator_owner = THIS_MODULE, }; static int __init cfq_init(void) { int ret; |
22e2c507c [PATCH] Update cf... |
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/* * could be 0 on HZ < 1000 setups */ if (!cfq_slice_async) cfq_slice_async = 1; if (!cfq_slice_idle) cfq_slice_idle = 1; |
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if (cfq_slab_setup()) return -ENOMEM; ret = elv_register(&iosched_cfq); |
22e2c507c [PATCH] Update cf... |
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if (ret) cfq_slab_kill(); |
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|
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return ret; } static void __exit cfq_exit(void) { |
334e94de9 [PATCH] deal with... |
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DECLARE_COMPLETION(all_gone); |
1da177e4c Linux-2.6.12-rc2 |
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elv_unregister(&iosched_cfq); |
334e94de9 [PATCH] deal with... |
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ioc_gone = &all_gone; |
fba822722 [PATCH 1/2] iosch... |
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/* ioc_gone's update must be visible before reading ioc_count */ smp_wmb(); |
334e94de9 [PATCH] deal with... |
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if (atomic_read(&ioc_count)) |
fba822722 [PATCH 1/2] iosch... |
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wait_for_completion(ioc_gone); |
334e94de9 [PATCH] deal with... |
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synchronize_rcu(); |
83521d3eb [PATCH] cfq-iosch... |
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cfq_slab_kill(); |
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} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |