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block/cfq-iosched.c
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/* |
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* CFQ, or complete fairness queueing, disk scheduler. * * Based on ideas from a previously unfinished io * scheduler (round robin per-process disk scheduling) and Andrea Arcangeli. * |
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* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
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*/ |
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#include <linux/module.h> |
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#include <linux/blkdev.h> #include <linux/elevator.h> |
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#include <linux/rbtree.h> |
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#include <linux/ioprio.h> |
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/* * tunables */ |
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static const int cfq_quantum = 4; /* max queue in one round of service */ |
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static const int cfq_fifo_expire[2] = { HZ / 4, HZ / 8 }; static const int cfq_back_max = 16 * 1024; /* maximum backwards seek, in KiB */ static const int cfq_back_penalty = 2; /* penalty of a backwards seek */ |
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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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/* * grace period before allowing idle class to get disk access */ |
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#define CFQ_IDLE_GRACE (HZ / 10) |
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/* * below this threshold, we consider thinktime immediate */ #define CFQ_MIN_TT (2) |
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#define CFQ_SLICE_SCALE (5) |
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#define RQ_CIC(rq) ((struct cfq_io_context*)(rq)->elevator_private) #define RQ_CFQQ(rq) ((rq)->elevator_private2) |
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static struct kmem_cache *cfq_pool; static struct kmem_cache *cfq_ioc_pool; |
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static DEFINE_PER_CPU(unsigned long, ioc_count); |
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static struct completion *ioc_gone; |
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#define CFQ_PRIO_LISTS IOPRIO_BE_NR #define cfq_class_idle(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE) |
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#define cfq_class_rt(cfqq) ((cfqq)->ioprio_class == IOPRIO_CLASS_RT) |
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#define ASYNC (0) #define SYNC (1) |
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#define sample_valid(samples) ((samples) > 80) |
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/* |
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* Most of our rbtree usage is for sorting with min extraction, so * if we cache the leftmost node we don't have to walk down the tree * to find it. Idea borrowed from Ingo Molnars CFS scheduler. We should * move this into the elevator for the rq sorting as well. */ struct cfq_rb_root { struct rb_root rb; struct rb_node *left; }; #define CFQ_RB_ROOT (struct cfq_rb_root) { RB_ROOT, NULL, } /* |
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* Per block device queue structure */ |
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struct cfq_data { |
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struct request_queue *queue; |
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/* * rr list of queues with requests and the count of them */ |
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struct cfq_rb_root service_tree; |
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unsigned int busy_queues; |
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int rq_in_driver; |
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int sync_flight; |
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int hw_tag; |
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/* |
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* idle window management */ struct timer_list idle_slice_timer; struct work_struct unplug_work; |
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struct cfq_queue *active_queue; struct cfq_io_context *active_cic; |
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/* * async queue for each priority case */ struct cfq_queue *async_cfqq[2][IOPRIO_BE_NR]; struct cfq_queue *async_idle_cfqq; |
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struct timer_list idle_class_timer; |
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sector_t last_position; |
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unsigned long last_end_request; |
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/* * tunables, see top of file */ unsigned int cfq_quantum; |
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unsigned int cfq_fifo_expire[2]; |
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unsigned int cfq_back_penalty; unsigned int cfq_back_max; |
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unsigned int cfq_slice[2]; unsigned int cfq_slice_async_rq; unsigned int cfq_slice_idle; |
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struct list_head cic_list; |
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}; |
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/* * Per process-grouping structure */ |
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struct cfq_queue { /* reference count */ atomic_t ref; /* parent cfq_data */ struct cfq_data *cfqd; |
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/* service_tree member */ struct rb_node rb_node; /* service_tree key */ unsigned long rb_key; |
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/* sorted list of pending requests */ struct rb_root sort_list; /* if fifo isn't expired, next request to serve */ |
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struct request *next_rq; |
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/* requests queued in sort_list */ int queued[2]; /* currently allocated requests */ int allocated[2]; |
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/* pending metadata requests */ int meta_pending; |
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/* fifo list of requests in sort_list */ |
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struct list_head fifo; |
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|
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unsigned long slice_end; |
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long slice_resid; |
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/* number of requests that are on the dispatch list or inside driver */ int dispatched; |
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/* io prio of this group */ unsigned short ioprio, org_ioprio; unsigned short ioprio_class, org_ioprio_class; |
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/* various state flags, see below */ unsigned int flags; |
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}; |
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enum cfqq_state_flags { |
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CFQ_CFQQ_FLAG_on_rr = 0, /* on round-robin busy list */ CFQ_CFQQ_FLAG_wait_request, /* waiting for a request */ CFQ_CFQQ_FLAG_must_alloc, /* must be allowed rq alloc */ CFQ_CFQQ_FLAG_must_alloc_slice, /* per-slice must_alloc flag */ CFQ_CFQQ_FLAG_must_dispatch, /* must dispatch, even if expired */ CFQ_CFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */ CFQ_CFQQ_FLAG_idle_window, /* slice idling enabled */ CFQ_CFQQ_FLAG_prio_changed, /* task priority has changed */ CFQ_CFQQ_FLAG_queue_new, /* queue never been serviced */ |
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CFQ_CFQQ_FLAG_slice_new, /* no requests dispatched in slice */ |
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CFQ_CFQQ_FLAG_sync, /* synchronous queue */ |
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}; #define CFQ_CFQQ_FNS(name) \ static inline void cfq_mark_cfqq_##name(struct cfq_queue *cfqq) \ { \ cfqq->flags |= (1 << CFQ_CFQQ_FLAG_##name); \ } \ static inline void cfq_clear_cfqq_##name(struct cfq_queue *cfqq) \ { \ cfqq->flags &= ~(1 << CFQ_CFQQ_FLAG_##name); \ } \ static inline int cfq_cfqq_##name(const struct cfq_queue *cfqq) \ { \ return (cfqq->flags & (1 << CFQ_CFQQ_FLAG_##name)) != 0; \ } CFQ_CFQQ_FNS(on_rr); CFQ_CFQQ_FNS(wait_request); CFQ_CFQQ_FNS(must_alloc); CFQ_CFQQ_FNS(must_alloc_slice); CFQ_CFQQ_FNS(must_dispatch); CFQ_CFQQ_FNS(fifo_expire); CFQ_CFQQ_FNS(idle_window); CFQ_CFQQ_FNS(prio_changed); |
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CFQ_CFQQ_FNS(queue_new); |
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CFQ_CFQQ_FNS(slice_new); |
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CFQ_CFQQ_FNS(sync); |
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#undef CFQ_CFQQ_FNS |
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static void cfq_dispatch_insert(struct request_queue *, struct request *); |
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static struct cfq_queue *cfq_get_queue(struct cfq_data *, int, struct task_struct *, gfp_t); static struct cfq_io_context *cfq_cic_rb_lookup(struct cfq_data *, struct io_context *); static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_context *cic, int is_sync) { return cic->cfqq[!!is_sync]; } static inline void cic_set_cfqq(struct cfq_io_context *cic, struct cfq_queue *cfqq, int is_sync) { cic->cfqq[!!is_sync] = cfqq; } /* * We regard a request as SYNC, if it's either a read or has the SYNC bit * set (in which case it could also be direct WRITE). */ static inline int cfq_bio_sync(struct bio *bio) { if (bio_data_dir(bio) == READ || bio_sync(bio)) return 1; return 0; } |
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/* |
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* scheduler run of queue, if there are requests pending and no one in the * driver that will restart queueing */ static inline void cfq_schedule_dispatch(struct cfq_data *cfqd) { |
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if (cfqd->busy_queues) |
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kblockd_schedule_work(&cfqd->unplug_work); } |
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static int cfq_queue_empty(struct request_queue *q) |
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{ struct cfq_data *cfqd = q->elevator->elevator_data; |
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return !cfqd->busy_queues; |
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} |
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/* |
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* 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. */ |
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static inline int cfq_prio_slice(struct cfq_data *cfqd, int sync, unsigned short prio) |
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{ |
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const int base_slice = cfqd->cfq_slice[sync]; |
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WARN_ON(prio >= IOPRIO_BE_NR); return base_slice + (base_slice/CFQ_SLICE_SCALE * (4 - prio)); } |
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static inline int cfq_prio_to_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { return cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio); |
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} static inline void cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { cfqq->slice_end = cfq_prio_to_slice(cfqd, cfqq) + jiffies; } /* * We need to wrap this check in cfq_cfqq_slice_new(), since ->slice_end * isn't valid until the first request from the dispatch is activated * and the slice time set. */ static inline int cfq_slice_used(struct cfq_queue *cfqq) { if (cfq_cfqq_slice_new(cfqq)) return 0; if (time_before(jiffies, cfqq->slice_end)) return 0; return 1; } /* |
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* Lifted from AS - choose which of rq1 and rq2 that is best served now. |
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* We choose the request that is closest to the head right now. Distance |
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* behind the head is penalized and only allowed to a certain extent. |
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*/ |
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static struct request * cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2) |
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{ sector_t last, s1, s2, d1 = 0, d2 = 0; |
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unsigned long back_max; |
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#define CFQ_RQ1_WRAP 0x01 /* request 1 wraps */ #define CFQ_RQ2_WRAP 0x02 /* request 2 wraps */ unsigned wrap = 0; /* bit mask: requests behind the disk head? */ |
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if (rq1 == NULL || rq1 == rq2) return rq2; if (rq2 == NULL) return rq1; |
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if (rq_is_sync(rq1) && !rq_is_sync(rq2)) return rq1; else if (rq_is_sync(rq2) && !rq_is_sync(rq1)) return rq2; |
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if (rq_is_meta(rq1) && !rq_is_meta(rq2)) return rq1; else if (rq_is_meta(rq2) && !rq_is_meta(rq1)) return rq2; |
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s1 = rq1->sector; s2 = rq2->sector; |
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last = cfqd->last_position; |
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/* * by definition, 1KiB is 2 sectors */ back_max = cfqd->cfq_back_max * 2; /* * Strict one way elevator _except_ in the case where we allow * short backward seeks which are biased as twice the cost of a * similar forward seek. */ if (s1 >= last) d1 = s1 - last; else if (s1 + back_max >= last) d1 = (last - s1) * cfqd->cfq_back_penalty; else |
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wrap |= CFQ_RQ1_WRAP; |
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if (s2 >= last) d2 = s2 - last; else if (s2 + back_max >= last) d2 = (last - s2) * cfqd->cfq_back_penalty; else |
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wrap |= CFQ_RQ2_WRAP; |
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/* Found required data */ |
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/* * By doing switch() on the bit mask "wrap" we avoid having to * check two variables for all permutations: --> faster! */ switch (wrap) { |
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case 0: /* common case for CFQ: rq1 and rq2 not wrapped */ |
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if (d1 < d2) |
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return rq1; |
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else if (d2 < d1) |
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return rq2; |
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else { if (s1 >= s2) |
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return rq1; |
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else |
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return rq2; |
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} |
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case CFQ_RQ2_WRAP: |
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return rq1; |
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case CFQ_RQ1_WRAP: |
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return rq2; case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both rqs wrapped */ |
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default: /* * Since both rqs are wrapped, * start with the one that's further behind head * (--> only *one* back seek required), * since back seek takes more time than forward. */ if (s1 <= s2) |
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return rq1; |
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else |
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return rq2; |
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} } |
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/* * The below is leftmost cache rbtree addon */ |
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static struct rb_node *cfq_rb_first(struct cfq_rb_root *root) { if (!root->left) root->left = rb_first(&root->rb); return root->left; } static void cfq_rb_erase(struct rb_node *n, struct cfq_rb_root *root) { if (root->left == n) root->left = NULL; rb_erase(n, &root->rb); RB_CLEAR_NODE(n); } |
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/* * would be nice to take fifo expire time into account as well */ |
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static struct request * cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *last) |
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{ |
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struct rb_node *rbnext = rb_next(&last->rb_node); struct rb_node *rbprev = rb_prev(&last->rb_node); |
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struct request *next = NULL, *prev = NULL; |
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BUG_ON(RB_EMPTY_NODE(&last->rb_node)); |
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if (rbprev) |
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prev = rb_entry_rq(rbprev); |
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if (rbnext) |
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next = rb_entry_rq(rbnext); |
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else { rbnext = rb_first(&cfqq->sort_list); if (rbnext && rbnext != &last->rb_node) |
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next = rb_entry_rq(rbnext); |
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} |
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return cfq_choose_req(cfqd, next, prev); |
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} |
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static unsigned long cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
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{ |
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/* * just an approximation, should be ok. */ |
67e6b49e3 cfq-iosched: slic... |
420 421 |
return (cfqd->busy_queues - 1) * (cfq_prio_slice(cfqd, 1, 0) - cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); |
d9e7620e6 cfq-iosched: rewo... |
422 |
} |
498d3aa2b [PATCH] cfq-iosch... |
423 424 425 426 427 |
/* * The cfqd->service_tree holds all pending cfq_queue's that have * requests waiting to be processed. It is sorted in the order that * we will service the queues. */ |
d9e7620e6 cfq-iosched: rewo... |
428 |
static void cfq_service_tree_add(struct cfq_data *cfqd, |
edd75ffd9 cfq-iosched: get ... |
429 |
struct cfq_queue *cfqq, int add_front) |
d9e7620e6 cfq-iosched: rewo... |
430 |
{ |
cc09e2990 [PATCH] cfq-iosch... |
431 |
struct rb_node **p = &cfqd->service_tree.rb.rb_node; |
d9e7620e6 cfq-iosched: rewo... |
432 |
struct rb_node *parent = NULL; |
d9e7620e6 cfq-iosched: rewo... |
433 |
unsigned long rb_key; |
498d3aa2b [PATCH] cfq-iosch... |
434 |
int left; |
d9e7620e6 cfq-iosched: rewo... |
435 |
|
edd75ffd9 cfq-iosched: get ... |
436 437 438 439 440 441 |
if (!add_front) { rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies; rb_key += cfqq->slice_resid; cfqq->slice_resid = 0; } else rb_key = 0; |
1da177e4c Linux-2.6.12-rc2 |
442 |
|
d9e7620e6 cfq-iosched: rewo... |
443 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) { |
99f9628ab [PATCH] cfq-iosch... |
444 |
/* |
d9e7620e6 cfq-iosched: rewo... |
445 |
* same position, nothing more to do |
99f9628ab [PATCH] cfq-iosch... |
446 |
*/ |
d9e7620e6 cfq-iosched: rewo... |
447 448 |
if (rb_key == cfqq->rb_key) return; |
1da177e4c Linux-2.6.12-rc2 |
449 |
|
cc09e2990 [PATCH] cfq-iosch... |
450 |
cfq_rb_erase(&cfqq->rb_node, &cfqd->service_tree); |
1da177e4c Linux-2.6.12-rc2 |
451 |
} |
d9e7620e6 cfq-iosched: rewo... |
452 |
|
498d3aa2b [PATCH] cfq-iosch... |
453 |
left = 1; |
d9e7620e6 cfq-iosched: rewo... |
454 |
while (*p) { |
cc09e2990 [PATCH] cfq-iosch... |
455 |
struct cfq_queue *__cfqq; |
67060e379 cfq-iosched: sort... |
456 |
struct rb_node **n; |
cc09e2990 [PATCH] cfq-iosch... |
457 |
|
d9e7620e6 cfq-iosched: rewo... |
458 459 |
parent = *p; __cfqq = rb_entry(parent, struct cfq_queue, rb_node); |
0c534e0a4 cfq-iosched: sort... |
460 461 |
/* * sort RT queues first, we always want to give |
67060e379 cfq-iosched: sort... |
462 463 |
* preference to them. IDLE queues goes to the back. * after that, sort on the next service time. |
0c534e0a4 cfq-iosched: sort... |
464 465 |
*/ if (cfq_class_rt(cfqq) > cfq_class_rt(__cfqq)) |
67060e379 cfq-iosched: sort... |
466 |
n = &(*p)->rb_left; |
0c534e0a4 cfq-iosched: sort... |
467 |
else if (cfq_class_rt(cfqq) < cfq_class_rt(__cfqq)) |
67060e379 cfq-iosched: sort... |
468 469 470 471 472 |
n = &(*p)->rb_right; else if (cfq_class_idle(cfqq) < cfq_class_idle(__cfqq)) n = &(*p)->rb_left; else if (cfq_class_idle(cfqq) > cfq_class_idle(__cfqq)) n = &(*p)->rb_right; |
0c534e0a4 cfq-iosched: sort... |
473 |
else if (rb_key < __cfqq->rb_key) |
67060e379 cfq-iosched: sort... |
474 475 476 477 478 |
n = &(*p)->rb_left; else n = &(*p)->rb_right; if (n == &(*p)->rb_right) |
cc09e2990 [PATCH] cfq-iosch... |
479 |
left = 0; |
67060e379 cfq-iosched: sort... |
480 481 |
p = n; |
d9e7620e6 cfq-iosched: rewo... |
482 |
} |
cc09e2990 [PATCH] cfq-iosch... |
483 484 |
if (left) cfqd->service_tree.left = &cfqq->rb_node; |
d9e7620e6 cfq-iosched: rewo... |
485 486 |
cfqq->rb_key = rb_key; rb_link_node(&cfqq->rb_node, parent, p); |
cc09e2990 [PATCH] cfq-iosch... |
487 |
rb_insert_color(&cfqq->rb_node, &cfqd->service_tree.rb); |
1da177e4c Linux-2.6.12-rc2 |
488 |
} |
498d3aa2b [PATCH] cfq-iosch... |
489 490 491 |
/* * Update cfqq's position in the service tree. */ |
edd75ffd9 cfq-iosched: get ... |
492 |
static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
493 |
{ |
6d048f531 cfq-iosched: deve... |
494 495 496 |
/* * Resorting requires the cfqq to be on the RR list already. */ |
498d3aa2b [PATCH] cfq-iosch... |
497 |
if (cfq_cfqq_on_rr(cfqq)) |
edd75ffd9 cfq-iosched: get ... |
498 |
cfq_service_tree_add(cfqd, cfqq, 0); |
6d048f531 cfq-iosched: deve... |
499 |
} |
1da177e4c Linux-2.6.12-rc2 |
500 501 |
/* * add to busy list of queues for service, trying to be fair in ordering |
22e2c507c [PATCH] Update cf... |
502 |
* the pending list according to last request service |
1da177e4c Linux-2.6.12-rc2 |
503 504 |
*/ static inline void |
b4878f245 [PATCH] 02/05: up... |
505 |
cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
506 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
507 508 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
509 |
cfqd->busy_queues++; |
edd75ffd9 cfq-iosched: get ... |
510 |
cfq_resort_rr_list(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
511 |
} |
498d3aa2b [PATCH] cfq-iosch... |
512 513 514 515 |
/* * Called when the cfqq no longer has requests pending, remove it from * the service tree. */ |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 |
static inline void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) { |
3b18152c3 [PATCH] CFQ io sc... |
519 520 |
BUG_ON(!cfq_cfqq_on_rr(cfqq)); cfq_clear_cfqq_on_rr(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
521 |
|
cc09e2990 [PATCH] cfq-iosch... |
522 523 |
if (!RB_EMPTY_NODE(&cfqq->rb_node)) cfq_rb_erase(&cfqq->rb_node, &cfqd->service_tree); |
d9e7620e6 cfq-iosched: rewo... |
524 |
|
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 530 531 |
BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; } /* * rb tree support functions */ |
5e7053747 [PATCH] cfq-iosch... |
532 |
static inline void cfq_del_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
533 |
{ |
5e7053747 [PATCH] cfq-iosch... |
534 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
535 |
struct cfq_data *cfqd = cfqq->cfqd; |
5e7053747 [PATCH] cfq-iosch... |
536 |
const int sync = rq_is_sync(rq); |
1da177e4c Linux-2.6.12-rc2 |
537 |
|
b4878f245 [PATCH] 02/05: up... |
538 539 |
BUG_ON(!cfqq->queued[sync]); cfqq->queued[sync]--; |
1da177e4c Linux-2.6.12-rc2 |
540 |
|
5e7053747 [PATCH] cfq-iosch... |
541 |
elv_rb_del(&cfqq->sort_list, rq); |
1da177e4c Linux-2.6.12-rc2 |
542 |
|
dd67d0515 [PATCH] rbtree: s... |
543 |
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list)) |
b4878f245 [PATCH] 02/05: up... |
544 |
cfq_del_cfqq_rr(cfqd, cfqq); |
1da177e4c Linux-2.6.12-rc2 |
545 |
} |
5e7053747 [PATCH] cfq-iosch... |
546 |
static void cfq_add_rq_rb(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
547 |
{ |
5e7053747 [PATCH] cfq-iosch... |
548 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
549 |
struct cfq_data *cfqd = cfqq->cfqd; |
21183b07e [PATCH] cfq-iosch... |
550 |
struct request *__alias; |
1da177e4c Linux-2.6.12-rc2 |
551 |
|
5380a101d [PATCH] cfq-iosch... |
552 |
cfqq->queued[rq_is_sync(rq)]++; |
1da177e4c Linux-2.6.12-rc2 |
553 554 555 556 557 |
/* * looks a little odd, but the first insert might return an alias. * if that happens, put the alias on the dispatch list */ |
21183b07e [PATCH] cfq-iosch... |
558 |
while ((__alias = elv_rb_add(&cfqq->sort_list, rq)) != NULL) |
5e7053747 [PATCH] cfq-iosch... |
559 |
cfq_dispatch_insert(cfqd->queue, __alias); |
5fccbf61b [PATCH] CFQ: requ... |
560 561 562 |
if (!cfq_cfqq_on_rr(cfqq)) cfq_add_cfqq_rr(cfqd, cfqq); |
5044eed48 cfq-iosched: fix ... |
563 564 565 566 567 568 |
/* * check if this request is a better next-serve candidate */ cfqq->next_rq = cfq_choose_req(cfqd, cfqq->next_rq, rq); BUG_ON(!cfqq->next_rq); |
1da177e4c Linux-2.6.12-rc2 |
569 570 571 |
} static inline void |
5e7053747 [PATCH] cfq-iosch... |
572 |
cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
573 |
{ |
5380a101d [PATCH] cfq-iosch... |
574 575 |
elv_rb_del(&cfqq->sort_list, rq); cfqq->queued[rq_is_sync(rq)]--; |
5e7053747 [PATCH] cfq-iosch... |
576 |
cfq_add_rq_rb(rq); |
1da177e4c Linux-2.6.12-rc2 |
577 |
} |
206dc69b3 [BLOCK] cfq-iosch... |
578 579 |
static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
580 |
{ |
206dc69b3 [BLOCK] cfq-iosch... |
581 |
struct task_struct *tsk = current; |
91fac317a cfq-iosched: get ... |
582 |
struct cfq_io_context *cic; |
206dc69b3 [BLOCK] cfq-iosch... |
583 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
584 |
|
91fac317a cfq-iosched: get ... |
585 586 587 588 589 |
cic = cfq_cic_rb_lookup(cfqd, tsk->io_context); if (!cic) return NULL; cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
89850f7ee [PATCH] cfq-iosch... |
590 591 |
if (cfqq) { sector_t sector = bio->bi_sector + bio_sectors(bio); |
21183b07e [PATCH] cfq-iosch... |
592 |
return elv_rb_find(&cfqq->sort_list, sector); |
89850f7ee [PATCH] cfq-iosch... |
593 |
} |
1da177e4c Linux-2.6.12-rc2 |
594 |
|
1da177e4c Linux-2.6.12-rc2 |
595 596 |
return NULL; } |
165125e1e [BLOCK] Get rid o... |
597 |
static void cfq_activate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
598 |
{ |
22e2c507c [PATCH] Update cf... |
599 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
600 |
|
b4878f245 [PATCH] 02/05: up... |
601 |
cfqd->rq_in_driver++; |
25776e359 [PATCH] cfq-iosch... |
602 603 604 605 606 607 608 609 610 |
/* * 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; |
6d048f531 cfq-iosched: deve... |
611 612 |
cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors; |
1da177e4c Linux-2.6.12-rc2 |
613 |
} |
165125e1e [BLOCK] Get rid o... |
614 |
static void cfq_deactivate_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
615 |
{ |
b4878f245 [PATCH] 02/05: up... |
616 617 618 619 |
struct cfq_data *cfqd = q->elevator->elevator_data; WARN_ON(!cfqd->rq_in_driver); cfqd->rq_in_driver--; |
1da177e4c Linux-2.6.12-rc2 |
620 |
} |
b4878f245 [PATCH] 02/05: up... |
621 |
static void cfq_remove_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
622 |
{ |
5e7053747 [PATCH] cfq-iosch... |
623 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
21183b07e [PATCH] cfq-iosch... |
624 |
|
5e7053747 [PATCH] cfq-iosch... |
625 626 |
if (cfqq->next_rq == rq) cfqq->next_rq = cfq_find_next_rq(cfqq->cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
627 |
|
b4878f245 [PATCH] 02/05: up... |
628 |
list_del_init(&rq->queuelist); |
5e7053747 [PATCH] cfq-iosch... |
629 |
cfq_del_rq_rb(rq); |
374f84ac3 [PATCH] cfq-iosch... |
630 631 632 633 634 |
if (rq_is_meta(rq)) { WARN_ON(!cfqq->meta_pending); cfqq->meta_pending--; } |
1da177e4c Linux-2.6.12-rc2 |
635 |
} |
165125e1e [BLOCK] Get rid o... |
636 637 |
static int cfq_merge(struct request_queue *q, struct request **req, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct request *__rq; |
1da177e4c Linux-2.6.12-rc2 |
641 |
|
206dc69b3 [BLOCK] cfq-iosch... |
642 |
__rq = cfq_find_rq_fmerge(cfqd, bio); |
22e2c507c [PATCH] Update cf... |
643 |
if (__rq && elv_rq_merge_ok(__rq, bio)) { |
9817064b6 [PATCH] elevator:... |
644 645 |
*req = __rq; return ELEVATOR_FRONT_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
646 647 648 |
} return ELEVATOR_NO_MERGE; |
1da177e4c Linux-2.6.12-rc2 |
649 |
} |
165125e1e [BLOCK] Get rid o... |
650 |
static void cfq_merged_request(struct request_queue *q, struct request *req, |
21183b07e [PATCH] cfq-iosch... |
651 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
652 |
{ |
21183b07e [PATCH] cfq-iosch... |
653 |
if (type == ELEVATOR_FRONT_MERGE) { |
5e7053747 [PATCH] cfq-iosch... |
654 |
struct cfq_queue *cfqq = RQ_CFQQ(req); |
1da177e4c Linux-2.6.12-rc2 |
655 |
|
5e7053747 [PATCH] cfq-iosch... |
656 |
cfq_reposition_rq_rb(cfqq, req); |
1da177e4c Linux-2.6.12-rc2 |
657 |
} |
1da177e4c Linux-2.6.12-rc2 |
658 659 660 |
} static void |
165125e1e [BLOCK] Get rid o... |
661 |
cfq_merged_requests(struct request_queue *q, struct request *rq, |
1da177e4c Linux-2.6.12-rc2 |
662 663 |
struct request *next) { |
22e2c507c [PATCH] Update cf... |
664 665 666 667 668 669 |
/* * 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... |
670 |
cfq_remove_request(next); |
22e2c507c [PATCH] Update cf... |
671 |
} |
165125e1e [BLOCK] Get rid o... |
672 |
static int cfq_allow_merge(struct request_queue *q, struct request *rq, |
da7752650 [PATCH] cfq-iosch... |
673 674 675 |
struct bio *bio) { struct cfq_data *cfqd = q->elevator->elevator_data; |
91fac317a cfq-iosched: get ... |
676 |
struct cfq_io_context *cic; |
da7752650 [PATCH] cfq-iosch... |
677 |
struct cfq_queue *cfqq; |
da7752650 [PATCH] cfq-iosch... |
678 679 |
/* |
ec8acb690 [PATCH] cfq-iosch... |
680 |
* Disallow merge of a sync bio into an async request. |
da7752650 [PATCH] cfq-iosch... |
681 |
*/ |
91fac317a cfq-iosched: get ... |
682 |
if (cfq_bio_sync(bio) && !rq_is_sync(rq)) |
da7752650 [PATCH] cfq-iosch... |
683 684 685 |
return 0; /* |
719d34027 [PATCH] cfq-iosch... |
686 687 |
* Lookup the cfqq that this bio will be queued with. Allow * merge only if rq is queued there. |
da7752650 [PATCH] cfq-iosch... |
688 |
*/ |
91fac317a cfq-iosched: get ... |
689 690 691 |
cic = cfq_cic_rb_lookup(cfqd, current->io_context); if (!cic) return 0; |
719d34027 [PATCH] cfq-iosch... |
692 |
|
91fac317a cfq-iosched: get ... |
693 |
cfqq = cic_to_cfqq(cic, cfq_bio_sync(bio)); |
719d34027 [PATCH] cfq-iosch... |
694 695 |
if (cfqq == RQ_CFQQ(rq)) return 1; |
da7752650 [PATCH] cfq-iosch... |
696 |
|
ec8acb690 [PATCH] cfq-iosch... |
697 |
return 0; |
da7752650 [PATCH] cfq-iosch... |
698 |
} |
22e2c507c [PATCH] Update cf... |
699 700 701 702 703 704 705 706 |
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); |
22e2c507c [PATCH] Update cf... |
707 |
cfqq->slice_end = 0; |
3b18152c3 [PATCH] CFQ io sc... |
708 709 |
cfq_clear_cfqq_must_alloc_slice(cfqq); cfq_clear_cfqq_fifo_expire(cfqq); |
44f7c1606 cfq-iosched: defe... |
710 |
cfq_mark_cfqq_slice_new(cfqq); |
1afba0451 cfq-iosched: mino... |
711 |
cfq_clear_cfqq_queue_new(cfqq); |
22e2c507c [PATCH] Update cf... |
712 713 714 715 716 717 |
} cfqd->active_queue = cfqq; } /* |
7b14e3b52 [PATCH] cfq-iosch... |
718 719 720 721 |
* 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, |
6084cdda0 cfq-iosched: don'... |
722 |
int timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
723 |
{ |
7b14e3b52 [PATCH] cfq-iosch... |
724 725 |
if (cfq_cfqq_wait_request(cfqq)) del_timer(&cfqd->idle_slice_timer); |
7b14e3b52 [PATCH] cfq-iosch... |
726 727 728 729 |
cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); /* |
6084cdda0 cfq-iosched: don'... |
730 |
* store what was left of this slice, if the queue idled/timed out |
7b14e3b52 [PATCH] cfq-iosch... |
731 |
*/ |
3c6bd2f87 cfq-iosched: chec... |
732 |
if (timed_out && !cfq_cfqq_slice_new(cfqq)) |
c5b680f3b cfq-iosched: acco... |
733 |
cfqq->slice_resid = cfqq->slice_end - jiffies; |
7b14e3b52 [PATCH] cfq-iosch... |
734 |
|
edd75ffd9 cfq-iosched: get ... |
735 |
cfq_resort_rr_list(cfqd, cfqq); |
7b14e3b52 [PATCH] cfq-iosch... |
736 737 738 739 740 741 742 743 |
if (cfqq == cfqd->active_queue) cfqd->active_queue = NULL; if (cfqd->active_cic) { put_io_context(cfqd->active_cic->ioc); cfqd->active_cic = NULL; } |
7b14e3b52 [PATCH] cfq-iosch... |
744 |
} |
6084cdda0 cfq-iosched: don'... |
745 |
static inline void cfq_slice_expired(struct cfq_data *cfqd, int timed_out) |
7b14e3b52 [PATCH] cfq-iosch... |
746 747 748 749 |
{ struct cfq_queue *cfqq = cfqd->active_queue; if (cfqq) |
6084cdda0 cfq-iosched: don'... |
750 |
__cfq_slice_expired(cfqd, cfqq, timed_out); |
7b14e3b52 [PATCH] cfq-iosch... |
751 |
} |
498d3aa2b [PATCH] cfq-iosch... |
752 753 754 755 |
/* * Get next queue for service. Unless we have a queue preemption, * we'll simply select the first cfqq in the service tree. */ |
6d048f531 cfq-iosched: deve... |
756 |
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
757 |
{ |
edd75ffd9 cfq-iosched: get ... |
758 759 |
struct cfq_queue *cfqq; struct rb_node *n; |
22e2c507c [PATCH] Update cf... |
760 |
|
edd75ffd9 cfq-iosched: get ... |
761 762 |
if (RB_EMPTY_ROOT(&cfqd->service_tree.rb)) return NULL; |
d9e7620e6 cfq-iosched: rewo... |
763 |
|
edd75ffd9 cfq-iosched: get ... |
764 765 |
n = cfq_rb_first(&cfqd->service_tree); cfqq = rb_entry(n, struct cfq_queue, rb_node); |
498d3aa2b [PATCH] cfq-iosch... |
766 |
|
edd75ffd9 cfq-iosched: get ... |
767 768 769 770 771 772 773 774 775 776 777 778 779 |
if (cfq_class_idle(cfqq)) { unsigned long end; /* * 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 */ end = cfqd->last_end_request + CFQ_IDLE_GRACE; if (time_before(jiffies, end)) { mod_timer(&cfqd->idle_class_timer, end); cfqq = NULL; |
67060e379 cfq-iosched: sort... |
780 |
} |
22e2c507c [PATCH] Update cf... |
781 |
} |
6d048f531 cfq-iosched: deve... |
782 783 |
return cfqq; } |
498d3aa2b [PATCH] cfq-iosch... |
784 785 786 |
/* * Get and set a new active queue for service. */ |
6d048f531 cfq-iosched: deve... |
787 788 789 |
static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd) { struct cfq_queue *cfqq; |
d9e7620e6 cfq-iosched: rewo... |
790 |
cfqq = cfq_get_next_queue(cfqd); |
22e2c507c [PATCH] Update cf... |
791 |
__cfq_set_active_queue(cfqd, cfqq); |
3b18152c3 [PATCH] CFQ io sc... |
792 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
793 |
} |
d9e7620e6 cfq-iosched: rewo... |
794 795 796 797 798 799 800 801 |
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd, struct request *rq) { if (rq->sector >= cfqd->last_position) return rq->sector - cfqd->last_position; else return cfqd->last_position - rq->sector; } |
6d048f531 cfq-iosched: deve... |
802 803 804 805 806 807 808 809 810 |
static inline int cfq_rq_close(struct cfq_data *cfqd, struct request *rq) { struct cfq_io_context *cic = cfqd->active_cic; if (!sample_valid(cic->seek_samples)) return 0; return cfq_dist_from_last(cfqd, rq) <= cic->seek_mean; } |
d9e7620e6 cfq-iosched: rewo... |
811 812 |
static int cfq_close_cooperator(struct cfq_data *cfq_data, struct cfq_queue *cfqq) |
6d048f531 cfq-iosched: deve... |
813 |
{ |
6d048f531 cfq-iosched: deve... |
814 |
/* |
d9e7620e6 cfq-iosched: rewo... |
815 816 817 |
* We should notice if some of the queues are cooperating, eg * working closely on the same area of the disk. In that case, * we can group them together and don't waste time idling. |
6d048f531 cfq-iosched: deve... |
818 |
*/ |
d9e7620e6 cfq-iosched: rewo... |
819 |
return 0; |
6d048f531 cfq-iosched: deve... |
820 821 822 |
} #define CIC_SEEKY(cic) ((cic)->seek_mean > (8 * 1024)) |
caaa5f9f0 [PATCH] cfq-iosch... |
823 |
|
6d048f531 cfq-iosched: deve... |
824 |
static void cfq_arm_slice_timer(struct cfq_data *cfqd) |
22e2c507c [PATCH] Update cf... |
825 |
{ |
1792669cc cfq-iosched: don'... |
826 |
struct cfq_queue *cfqq = cfqd->active_queue; |
206dc69b3 [BLOCK] cfq-iosch... |
827 |
struct cfq_io_context *cic; |
7b14e3b52 [PATCH] cfq-iosch... |
828 |
unsigned long sl; |
dd67d0515 [PATCH] rbtree: s... |
829 |
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list)); |
6d048f531 cfq-iosched: deve... |
830 |
WARN_ON(cfq_cfqq_slice_new(cfqq)); |
22e2c507c [PATCH] Update cf... |
831 832 833 834 |
/* * idle is disabled, either manually or by past process history */ |
6d048f531 cfq-iosched: deve... |
835 836 |
if (!cfqd->cfq_slice_idle || !cfq_cfqq_idle_window(cfqq)) return; |
22e2c507c [PATCH] Update cf... |
837 838 839 |
/* * task has exited, don't wait */ |
206dc69b3 [BLOCK] cfq-iosch... |
840 841 |
cic = cfqd->active_cic; if (!cic || !cic->ioc->task) |
6d048f531 cfq-iosched: deve... |
842 843 844 845 846 |
return; /* * See if this prio level has a good candidate */ |
1afba0451 cfq-iosched: mino... |
847 848 |
if (cfq_close_cooperator(cfqd, cfqq) && (sample_valid(cic->ttime_samples) && cic->ttime_mean > 2)) |
6d048f531 cfq-iosched: deve... |
849 |
return; |
22e2c507c [PATCH] Update cf... |
850 |
|
3b18152c3 [PATCH] CFQ io sc... |
851 852 |
cfq_mark_cfqq_must_dispatch(cfqq); cfq_mark_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
853 |
|
206dc69b3 [BLOCK] cfq-iosch... |
854 855 856 857 858 |
/* * 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 */ |
6d048f531 cfq-iosched: deve... |
859 |
sl = cfqd->cfq_slice_idle; |
caaa5f9f0 [PATCH] cfq-iosch... |
860 |
if (sample_valid(cic->seek_samples) && CIC_SEEKY(cic)) |
d9e7620e6 cfq-iosched: rewo... |
861 |
sl = min(sl, msecs_to_jiffies(CFQ_MIN_TT)); |
206dc69b3 [BLOCK] cfq-iosch... |
862 |
|
7b14e3b52 [PATCH] cfq-iosch... |
863 |
mod_timer(&cfqd->idle_slice_timer, jiffies + sl); |
1da177e4c Linux-2.6.12-rc2 |
864 |
} |
498d3aa2b [PATCH] cfq-iosch... |
865 866 867 |
/* * Move request from internal lists to the request queue dispatch list. */ |
165125e1e [BLOCK] Get rid o... |
868 |
static void cfq_dispatch_insert(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
869 |
{ |
3ed9a2965 cfq-iosched: impr... |
870 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
871 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
872 |
|
5380a101d [PATCH] cfq-iosch... |
873 |
cfq_remove_request(rq); |
6d048f531 cfq-iosched: deve... |
874 |
cfqq->dispatched++; |
5380a101d [PATCH] cfq-iosch... |
875 |
elv_dispatch_sort(q, rq); |
3ed9a2965 cfq-iosched: impr... |
876 877 878 |
if (cfq_cfqq_sync(cfqq)) cfqd->sync_flight++; |
1da177e4c Linux-2.6.12-rc2 |
879 880 881 882 883 |
} /* * return expired entry, or NULL to just start from scratch in rbtree */ |
5e7053747 [PATCH] cfq-iosch... |
884 |
static inline struct request *cfq_check_fifo(struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
885 886 |
{ struct cfq_data *cfqd = cfqq->cfqd; |
22e2c507c [PATCH] Update cf... |
887 |
struct request *rq; |
89850f7ee [PATCH] cfq-iosch... |
888 |
int fifo; |
1da177e4c Linux-2.6.12-rc2 |
889 |
|
3b18152c3 [PATCH] CFQ io sc... |
890 |
if (cfq_cfqq_fifo_expire(cfqq)) |
1da177e4c Linux-2.6.12-rc2 |
891 |
return NULL; |
cb8874119 cfq-iosched: twea... |
892 893 |
cfq_mark_cfqq_fifo_expire(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
894 895 |
if (list_empty(&cfqq->fifo)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
896 |
|
6d048f531 cfq-iosched: deve... |
897 |
fifo = cfq_cfqq_sync(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
898 |
rq = rq_entry_fifo(cfqq->fifo.next); |
1da177e4c Linux-2.6.12-rc2 |
899 |
|
6d048f531 cfq-iosched: deve... |
900 901 |
if (time_before(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo])) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
902 |
|
6d048f531 cfq-iosched: deve... |
903 |
return rq; |
1da177e4c Linux-2.6.12-rc2 |
904 |
} |
22e2c507c [PATCH] Update cf... |
905 906 907 908 |
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 |
909 |
|
22e2c507c [PATCH] Update cf... |
910 |
WARN_ON(cfqq->ioprio >= IOPRIO_BE_NR); |
1da177e4c Linux-2.6.12-rc2 |
911 |
|
22e2c507c [PATCH] Update cf... |
912 |
return 2 * (base_rq + base_rq * (CFQ_PRIO_LISTS - 1 - cfqq->ioprio)); |
1da177e4c Linux-2.6.12-rc2 |
913 |
} |
22e2c507c [PATCH] Update cf... |
914 |
/* |
498d3aa2b [PATCH] cfq-iosch... |
915 916 |
* Select a queue for service. If we have a current active queue, * check whether to continue servicing it, or retrieve and set a new one. |
22e2c507c [PATCH] Update cf... |
917 |
*/ |
1b5ed5e1f [BLOCK] cfq-iosch... |
918 |
static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd) |
1da177e4c Linux-2.6.12-rc2 |
919 |
{ |
1da177e4c Linux-2.6.12-rc2 |
920 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
921 |
|
22e2c507c [PATCH] Update cf... |
922 923 924 |
cfqq = cfqd->active_queue; if (!cfqq) goto new_queue; |
1da177e4c Linux-2.6.12-rc2 |
925 |
|
22e2c507c [PATCH] Update cf... |
926 |
/* |
6d048f531 cfq-iosched: deve... |
927 |
* The active queue has run out of time, expire it and select new. |
22e2c507c [PATCH] Update cf... |
928 |
*/ |
6d048f531 cfq-iosched: deve... |
929 |
if (cfq_slice_used(cfqq)) |
3b18152c3 [PATCH] CFQ io sc... |
930 |
goto expire; |
1da177e4c Linux-2.6.12-rc2 |
931 |
|
22e2c507c [PATCH] Update cf... |
932 |
/* |
6d048f531 cfq-iosched: deve... |
933 934 |
* The active queue has requests and isn't expired, allow it to * dispatch. |
22e2c507c [PATCH] Update cf... |
935 |
*/ |
dd67d0515 [PATCH] rbtree: s... |
936 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
937 |
goto keep_queue; |
6d048f531 cfq-iosched: deve... |
938 939 940 941 942 943 |
/* * No requests pending. If the active queue still has requests in * flight or is idling for a new request, allow either of these * conditions to happen (or time out) before selecting a new queue. */ |
cc1974797 cfq-iosched: tigh... |
944 945 |
if (timer_pending(&cfqd->idle_slice_timer) || (cfqq->dispatched && cfq_cfqq_idle_window(cfqq))) { |
caaa5f9f0 [PATCH] cfq-iosch... |
946 947 |
cfqq = NULL; goto keep_queue; |
22e2c507c [PATCH] Update cf... |
948 |
} |
3b18152c3 [PATCH] CFQ io sc... |
949 |
expire: |
6084cdda0 cfq-iosched: don'... |
950 |
cfq_slice_expired(cfqd, 0); |
3b18152c3 [PATCH] CFQ io sc... |
951 952 |
new_queue: cfqq = cfq_set_active_queue(cfqd); |
22e2c507c [PATCH] Update cf... |
953 |
keep_queue: |
3b18152c3 [PATCH] CFQ io sc... |
954 |
return cfqq; |
22e2c507c [PATCH] Update cf... |
955 |
} |
498d3aa2b [PATCH] cfq-iosch... |
956 957 958 959 |
/* * Dispatch some requests from cfqq, moving them to the request queue * dispatch list. */ |
22e2c507c [PATCH] Update cf... |
960 961 962 963 964 |
static int __cfq_dispatch_requests(struct cfq_data *cfqd, struct cfq_queue *cfqq, int max_dispatch) { int dispatched = 0; |
dd67d0515 [PATCH] rbtree: s... |
965 |
BUG_ON(RB_EMPTY_ROOT(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
966 967 |
do { |
5e7053747 [PATCH] cfq-iosch... |
968 |
struct request *rq; |
1da177e4c Linux-2.6.12-rc2 |
969 970 |
/* |
22e2c507c [PATCH] Update cf... |
971 |
* follow expired path, else get first next available |
1da177e4c Linux-2.6.12-rc2 |
972 |
*/ |
5e7053747 [PATCH] cfq-iosch... |
973 974 |
if ((rq = cfq_check_fifo(cfqq)) == NULL) rq = cfqq->next_rq; |
22e2c507c [PATCH] Update cf... |
975 976 977 978 |
/* * finally, insert request into driver dispatch list */ |
5e7053747 [PATCH] cfq-iosch... |
979 |
cfq_dispatch_insert(cfqd->queue, rq); |
1da177e4c Linux-2.6.12-rc2 |
980 |
|
22e2c507c [PATCH] Update cf... |
981 |
dispatched++; |
1da177e4c Linux-2.6.12-rc2 |
982 |
|
22e2c507c [PATCH] Update cf... |
983 |
if (!cfqd->active_cic) { |
5e7053747 [PATCH] cfq-iosch... |
984 985 |
atomic_inc(&RQ_CIC(rq)->ioc->refcount); cfqd->active_cic = RQ_CIC(rq); |
22e2c507c [PATCH] Update cf... |
986 |
} |
1da177e4c Linux-2.6.12-rc2 |
987 |
|
dd67d0515 [PATCH] rbtree: s... |
988 |
if (RB_EMPTY_ROOT(&cfqq->sort_list)) |
22e2c507c [PATCH] Update cf... |
989 990 991 992 993 |
break; } while (dispatched < max_dispatch); /* |
22e2c507c [PATCH] Update cf... |
994 995 996 |
* expire an async queue immediately if it has used up its slice. idle * queue always expire after 1 dispatch round. */ |
a99380065 cfq-iosched: fix ... |
997 |
if (cfqd->busy_queues > 1 && ((!cfq_cfqq_sync(cfqq) && |
20e493a8d cfq-iosched: get ... |
998 |
dispatched >= cfq_prio_to_maxrq(cfqd, cfqq)) || |
a99380065 cfq-iosched: fix ... |
999 |
cfq_class_idle(cfqq))) { |
44f7c1606 cfq-iosched: defe... |
1000 |
cfqq->slice_end = jiffies + 1; |
6084cdda0 cfq-iosched: don'... |
1001 |
cfq_slice_expired(cfqd, 0); |
44f7c1606 cfq-iosched: defe... |
1002 |
} |
22e2c507c [PATCH] Update cf... |
1003 1004 1005 |
return dispatched; } |
d9e7620e6 cfq-iosched: rewo... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
static inline int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq) { int dispatched = 0; while (cfqq->next_rq) { cfq_dispatch_insert(cfqq->cfqd->queue, cfqq->next_rq); dispatched++; } BUG_ON(!list_empty(&cfqq->fifo)); return dispatched; } |
498d3aa2b [PATCH] cfq-iosch... |
1018 1019 1020 1021 |
/* * Drain our current requests. Used for barriers and when switching * io schedulers on-the-fly. */ |
d9e7620e6 cfq-iosched: rewo... |
1022 |
static int cfq_forced_dispatch(struct cfq_data *cfqd) |
1b5ed5e1f [BLOCK] cfq-iosch... |
1023 |
{ |
d9e7620e6 cfq-iosched: rewo... |
1024 1025 |
int dispatched = 0; struct rb_node *n; |
cc09e2990 [PATCH] cfq-iosch... |
1026 |
while ((n = cfq_rb_first(&cfqd->service_tree)) != NULL) { |
d9e7620e6 cfq-iosched: rewo... |
1027 |
struct cfq_queue *cfqq = rb_entry(n, struct cfq_queue, rb_node); |
1b5ed5e1f [BLOCK] cfq-iosch... |
1028 |
|
d9e7620e6 cfq-iosched: rewo... |
1029 1030 |
dispatched += __cfq_forced_dispatch_cfqq(cfqq); } |
1b5ed5e1f [BLOCK] cfq-iosch... |
1031 |
|
6084cdda0 cfq-iosched: don'... |
1032 |
cfq_slice_expired(cfqd, 0); |
1b5ed5e1f [BLOCK] cfq-iosch... |
1033 1034 1035 1036 1037 |
BUG_ON(cfqd->busy_queues); return dispatched; } |
165125e1e [BLOCK] Get rid o... |
1038 |
static int cfq_dispatch_requests(struct request_queue *q, int force) |
22e2c507c [PATCH] Update cf... |
1039 1040 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
6d048f531 cfq-iosched: deve... |
1041 |
struct cfq_queue *cfqq; |
caaa5f9f0 [PATCH] cfq-iosch... |
1042 |
int dispatched; |
22e2c507c [PATCH] Update cf... |
1043 1044 1045 |
if (!cfqd->busy_queues) return 0; |
1b5ed5e1f [BLOCK] cfq-iosch... |
1046 1047 |
if (unlikely(force)) return cfq_forced_dispatch(cfqd); |
caaa5f9f0 [PATCH] cfq-iosch... |
1048 |
dispatched = 0; |
caaa5f9f0 [PATCH] cfq-iosch... |
1049 |
while ((cfqq = cfq_select_queue(cfqd)) != NULL) { |
b4878f245 [PATCH] 02/05: up... |
1050 |
int max_dispatch; |
3ed9a2965 cfq-iosched: impr... |
1051 1052 1053 1054 1055 1056 |
max_dispatch = cfqd->cfq_quantum; if (cfq_class_idle(cfqq)) max_dispatch = 1; if (cfqq->dispatched >= max_dispatch) { if (cfqd->busy_queues > 1) |
6d048f531 cfq-iosched: deve... |
1057 |
break; |
3ed9a2965 cfq-iosched: impr... |
1058 |
if (cfqq->dispatched >= 4 * max_dispatch) |
a99380065 cfq-iosched: fix ... |
1059 1060 |
break; } |
9ede209e8 cfq-iosched: impr... |
1061 |
|
3ed9a2965 cfq-iosched: impr... |
1062 1063 |
if (cfqd->sync_flight && !cfq_cfqq_sync(cfqq)) break; |
3b18152c3 [PATCH] CFQ io sc... |
1064 1065 |
cfq_clear_cfqq_must_dispatch(cfqq); cfq_clear_cfqq_wait_request(cfqq); |
22e2c507c [PATCH] Update cf... |
1066 |
del_timer(&cfqd->idle_slice_timer); |
caaa5f9f0 [PATCH] cfq-iosch... |
1067 |
dispatched += __cfq_dispatch_requests(cfqd, cfqq, max_dispatch); |
1da177e4c Linux-2.6.12-rc2 |
1068 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1069 |
return dispatched; |
1da177e4c Linux-2.6.12-rc2 |
1070 |
} |
1da177e4c Linux-2.6.12-rc2 |
1071 |
/* |
5e7053747 [PATCH] cfq-iosch... |
1072 1073 |
* task holds one reference to the queue, dropped when task exits. each rq * in-flight on this queue also holds a reference, dropped when rq is freed. |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 1076 1077 1078 |
* * queue lock must be held here. */ static void cfq_put_queue(struct cfq_queue *cfqq) { |
22e2c507c [PATCH] Update cf... |
1079 1080 1081 |
struct cfq_data *cfqd = cfqq->cfqd; BUG_ON(atomic_read(&cfqq->ref) <= 0); |
1da177e4c Linux-2.6.12-rc2 |
1082 1083 1084 1085 1086 |
if (!atomic_dec_and_test(&cfqq->ref)) return; BUG_ON(rb_first(&cfqq->sort_list)); |
22e2c507c [PATCH] Update cf... |
1087 |
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]); |
3b18152c3 [PATCH] CFQ io sc... |
1088 |
BUG_ON(cfq_cfqq_on_rr(cfqq)); |
1da177e4c Linux-2.6.12-rc2 |
1089 |
|
28f95cbc3 cfq-iosched: remo... |
1090 |
if (unlikely(cfqd->active_queue == cfqq)) { |
6084cdda0 cfq-iosched: don'... |
1091 |
__cfq_slice_expired(cfqd, cfqq, 0); |
28f95cbc3 cfq-iosched: remo... |
1092 1093 |
cfq_schedule_dispatch(cfqd); } |
22e2c507c [PATCH] Update cf... |
1094 |
|
1da177e4c Linux-2.6.12-rc2 |
1095 1096 |
kmem_cache_free(cfq_pool, cfqq); } |
e2d74ac06 [PATCH] [BLOCK] c... |
1097 |
static void cfq_free_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1098 |
{ |
22e2c507c [PATCH] Update cf... |
1099 |
struct cfq_io_context *__cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1100 1101 |
struct rb_node *n; int freed = 0; |
1da177e4c Linux-2.6.12-rc2 |
1102 |
|
597bc485d cfq-iosched: spee... |
1103 |
ioc->ioc_data = NULL; |
e2d74ac06 [PATCH] [BLOCK] c... |
1104 1105 1106 |
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... |
1107 |
kmem_cache_free(cfq_ioc_pool, __cic); |
334e94de9 [PATCH] deal with... |
1108 |
freed++; |
1da177e4c Linux-2.6.12-rc2 |
1109 |
} |
4050cf167 [PATCH] cfq-iosch... |
1110 1111 1112 |
elv_ioc_count_mod(ioc_count, -freed); if (ioc_gone && !elv_ioc_count_read(ioc_count)) |
334e94de9 [PATCH] deal with... |
1113 |
complete(ioc_gone); |
1da177e4c Linux-2.6.12-rc2 |
1114 |
} |
89850f7ee [PATCH] cfq-iosch... |
1115 |
static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq) |
1da177e4c Linux-2.6.12-rc2 |
1116 |
{ |
28f95cbc3 cfq-iosched: remo... |
1117 |
if (unlikely(cfqq == cfqd->active_queue)) { |
6084cdda0 cfq-iosched: don'... |
1118 |
__cfq_slice_expired(cfqd, cfqq, 0); |
28f95cbc3 cfq-iosched: remo... |
1119 1120 |
cfq_schedule_dispatch(cfqd); } |
22e2c507c [PATCH] Update cf... |
1121 |
|
89850f7ee [PATCH] cfq-iosch... |
1122 1123 |
cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
1124 |
|
89850f7ee [PATCH] cfq-iosch... |
1125 1126 1127 |
static void __cfq_exit_single_io_context(struct cfq_data *cfqd, struct cfq_io_context *cic) { |
fc46379da [PATCH] cfq-iosch... |
1128 1129 1130 |
list_del_init(&cic->queue_list); smp_wmb(); cic->key = NULL; |
12a057321 [PATCH] keep sync... |
1131 |
if (cic->cfqq[ASYNC]) { |
89850f7ee [PATCH] cfq-iosch... |
1132 |
cfq_exit_cfqq(cfqd, cic->cfqq[ASYNC]); |
12a057321 [PATCH] keep sync... |
1133 1134 1135 1136 |
cic->cfqq[ASYNC] = NULL; } if (cic->cfqq[SYNC]) { |
89850f7ee [PATCH] cfq-iosch... |
1137 |
cfq_exit_cfqq(cfqd, cic->cfqq[SYNC]); |
12a057321 [PATCH] keep sync... |
1138 1139 |
cic->cfqq[SYNC] = NULL; } |
89850f7ee [PATCH] cfq-iosch... |
1140 |
} |
89850f7ee [PATCH] cfq-iosch... |
1141 1142 1143 |
static void cfq_exit_single_io_context(struct cfq_io_context *cic) { struct cfq_data *cfqd = cic->key; |
89850f7ee [PATCH] cfq-iosch... |
1144 |
if (cfqd) { |
165125e1e [BLOCK] Get rid o... |
1145 |
struct request_queue *q = cfqd->queue; |
89850f7ee [PATCH] cfq-iosch... |
1146 |
|
fc46379da [PATCH] cfq-iosch... |
1147 |
spin_lock_irq(q->queue_lock); |
89850f7ee [PATCH] cfq-iosch... |
1148 |
__cfq_exit_single_io_context(cfqd, cic); |
fc46379da [PATCH] cfq-iosch... |
1149 |
spin_unlock_irq(q->queue_lock); |
89850f7ee [PATCH] cfq-iosch... |
1150 |
} |
1da177e4c Linux-2.6.12-rc2 |
1151 |
} |
498d3aa2b [PATCH] cfq-iosch... |
1152 1153 1154 1155 |
/* * The process that ioc belongs to has exited, we need to clean up * and put the internal structures we have that belongs to that process. */ |
e2d74ac06 [PATCH] [BLOCK] c... |
1156 |
static void cfq_exit_io_context(struct io_context *ioc) |
1da177e4c Linux-2.6.12-rc2 |
1157 |
{ |
22e2c507c [PATCH] Update cf... |
1158 |
struct cfq_io_context *__cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1159 |
struct rb_node *n; |
22e2c507c [PATCH] Update cf... |
1160 |
|
597bc485d cfq-iosched: spee... |
1161 |
ioc->ioc_data = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1162 1163 1164 |
/* * put the reference this task is holding to the various queues */ |
e2d74ac06 [PATCH] [BLOCK] c... |
1165 1166 1167 |
n = rb_first(&ioc->cic_root); while (n != NULL) { __cic = rb_entry(n, struct cfq_io_context, rb_node); |
22e2c507c [PATCH] Update cf... |
1168 |
cfq_exit_single_io_context(__cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1169 |
n = rb_next(n); |
1da177e4c Linux-2.6.12-rc2 |
1170 |
} |
1da177e4c Linux-2.6.12-rc2 |
1171 |
} |
22e2c507c [PATCH] Update cf... |
1172 |
static struct cfq_io_context * |
8267e268e [PATCH] gfp_t: bl... |
1173 |
cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1174 |
{ |
b5deef901 [PATCH] Make sure... |
1175 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
1176 |
|
94f6030ca Slab allocators: ... |
1177 1178 |
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
1179 |
if (cic) { |
22e2c507c [PATCH] Update cf... |
1180 |
cic->last_end_request = jiffies; |
553698f94 [PATCH] cfq-iosch... |
1181 |
INIT_LIST_HEAD(&cic->queue_list); |
22e2c507c [PATCH] Update cf... |
1182 1183 |
cic->dtor = cfq_free_io_context; cic->exit = cfq_exit_io_context; |
4050cf167 [PATCH] cfq-iosch... |
1184 |
elv_ioc_count_inc(ioc_count); |
1da177e4c Linux-2.6.12-rc2 |
1185 1186 1187 1188 |
} return cic; } |
22e2c507c [PATCH] Update cf... |
1189 1190 1191 1192 |
static void cfq_init_prio_data(struct cfq_queue *cfqq) { struct task_struct *tsk = current; int ioprio_class; |
3b18152c3 [PATCH] CFQ io sc... |
1193 |
if (!cfq_cfqq_prio_changed(cfqq)) |
22e2c507c [PATCH] Update cf... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 |
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... |
1219 |
cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1220 1221 1222 1223 1224 1225 1226 1227 1228 |
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... |
1229 |
cfq_clear_cfqq_prio_changed(cfqq); |
22e2c507c [PATCH] Update cf... |
1230 |
} |
478a82b0e [PATCH] switch to... |
1231 |
static inline void changed_ioprio(struct cfq_io_context *cic) |
22e2c507c [PATCH] Update cf... |
1232 |
{ |
478a82b0e [PATCH] switch to... |
1233 1234 |
struct cfq_data *cfqd = cic->key; struct cfq_queue *cfqq; |
c1b707d25 [PATCH] CFQ: bad ... |
1235 |
unsigned long flags; |
35e6077cb [PATCH] cfq-iosch... |
1236 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1237 1238 |
if (unlikely(!cfqd)) return; |
c1b707d25 [PATCH] CFQ: bad ... |
1239 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
caaa5f9f0 [PATCH] cfq-iosch... |
1240 1241 1242 1243 |
cfqq = cic->cfqq[ASYNC]; if (cfqq) { struct cfq_queue *new_cfqq; |
91fac317a cfq-iosched: get ... |
1244 |
new_cfqq = cfq_get_queue(cfqd, ASYNC, cic->ioc->task, |
caaa5f9f0 [PATCH] cfq-iosch... |
1245 1246 1247 1248 1249 |
GFP_ATOMIC); if (new_cfqq) { cic->cfqq[ASYNC] = new_cfqq; cfq_put_queue(cfqq); } |
22e2c507c [PATCH] Update cf... |
1250 |
} |
caaa5f9f0 [PATCH] cfq-iosch... |
1251 1252 1253 1254 |
cfqq = cic->cfqq[SYNC]; if (cfqq) cfq_mark_cfqq_prio_changed(cfqq); |
c1b707d25 [PATCH] CFQ: bad ... |
1255 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
1256 |
} |
fc46379da [PATCH] cfq-iosch... |
1257 |
static void cfq_ioc_set_ioprio(struct io_context *ioc) |
22e2c507c [PATCH] Update cf... |
1258 |
{ |
a6a0763a6 [PATCH] fix the e... |
1259 |
struct cfq_io_context *cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1260 |
struct rb_node *n; |
a6a0763a6 [PATCH] fix the e... |
1261 |
|
fc46379da [PATCH] cfq-iosch... |
1262 |
ioc->ioprio_changed = 0; |
a6a0763a6 [PATCH] fix the e... |
1263 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1264 1265 1266 |
n = rb_first(&ioc->cic_root); while (n != NULL) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
3793c65c1 [PATCH] cfq-iosch... |
1267 |
|
478a82b0e [PATCH] switch to... |
1268 |
changed_ioprio(cic); |
e2d74ac06 [PATCH] [BLOCK] c... |
1269 1270 |
n = rb_next(n); } |
22e2c507c [PATCH] Update cf... |
1271 1272 1273 |
} static struct cfq_queue * |
15c31be4d cfq-iosched: fix ... |
1274 1275 |
cfq_find_alloc_queue(struct cfq_data *cfqd, int is_sync, struct task_struct *tsk, gfp_t gfp_mask) |
22e2c507c [PATCH] Update cf... |
1276 |
{ |
22e2c507c [PATCH] Update cf... |
1277 |
struct cfq_queue *cfqq, *new_cfqq = NULL; |
91fac317a cfq-iosched: get ... |
1278 |
struct cfq_io_context *cic; |
22e2c507c [PATCH] Update cf... |
1279 1280 |
retry: |
91fac317a cfq-iosched: get ... |
1281 1282 1283 |
cic = cfq_cic_rb_lookup(cfqd, tsk->io_context); /* cic always exists here */ cfqq = cic_to_cfqq(cic, is_sync); |
22e2c507c [PATCH] Update cf... |
1284 1285 1286 1287 1288 1289 |
if (!cfqq) { if (new_cfqq) { cfqq = new_cfqq; new_cfqq = NULL; } else if (gfp_mask & __GFP_WAIT) { |
89850f7ee [PATCH] cfq-iosch... |
1290 1291 1292 1293 1294 1295 |
/* * Inform the allocator of the fact that we will * just repeat this allocation if it fails, to allow * the allocator to do whatever it needs to attempt to * free memory. */ |
22e2c507c [PATCH] Update cf... |
1296 |
spin_unlock_irq(cfqd->queue->queue_lock); |
94f6030ca Slab allocators: ... |
1297 1298 1299 |
new_cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask | __GFP_NOFAIL | __GFP_ZERO, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
1300 1301 1302 |
spin_lock_irq(cfqd->queue->queue_lock); goto retry; } else { |
94f6030ca Slab allocators: ... |
1303 1304 1305 |
cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask | __GFP_ZERO, cfqd->queue->node); |
22e2c507c [PATCH] Update cf... |
1306 1307 1308 |
if (!cfqq) goto out; } |
d9e7620e6 cfq-iosched: rewo... |
1309 |
RB_CLEAR_NODE(&cfqq->rb_node); |
22e2c507c [PATCH] Update cf... |
1310 |
INIT_LIST_HEAD(&cfqq->fifo); |
22e2c507c [PATCH] Update cf... |
1311 1312 |
atomic_set(&cfqq->ref, 0); cfqq->cfqd = cfqd; |
c5b680f3b cfq-iosched: acco... |
1313 |
|
91fac317a cfq-iosched: get ... |
1314 |
if (is_sync) { |
a99380065 cfq-iosched: fix ... |
1315 |
cfq_mark_cfqq_idle_window(cfqq); |
91fac317a cfq-iosched: get ... |
1316 1317 |
cfq_mark_cfqq_sync(cfqq); } |
a99380065 cfq-iosched: fix ... |
1318 |
|
3b18152c3 [PATCH] CFQ io sc... |
1319 |
cfq_mark_cfqq_prio_changed(cfqq); |
53b03744e [PATCH] cfq-iosch... |
1320 |
cfq_mark_cfqq_queue_new(cfqq); |
91fac317a cfq-iosched: get ... |
1321 |
|
3b18152c3 [PATCH] CFQ io sc... |
1322 |
cfq_init_prio_data(cfqq); |
22e2c507c [PATCH] Update cf... |
1323 1324 1325 1326 |
} if (new_cfqq) kmem_cache_free(cfq_pool, new_cfqq); |
22e2c507c [PATCH] Update cf... |
1327 1328 1329 1330 |
out: WARN_ON((gfp_mask & __GFP_WAIT) && !cfqq); return cfqq; } |
c2dea2d1f cfq: async queue ... |
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 |
static struct cfq_queue ** cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) { switch(ioprio_class) { case IOPRIO_CLASS_RT: return &cfqd->async_cfqq[0][ioprio]; case IOPRIO_CLASS_BE: return &cfqd->async_cfqq[1][ioprio]; case IOPRIO_CLASS_IDLE: return &cfqd->async_idle_cfqq; default: BUG(); } } |
15c31be4d cfq-iosched: fix ... |
1345 1346 1347 1348 1349 |
static struct cfq_queue * cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct task_struct *tsk, gfp_t gfp_mask) { const int ioprio = task_ioprio(tsk); |
c2dea2d1f cfq: async queue ... |
1350 1351 |
const int ioprio_class = task_ioprio_class(tsk); struct cfq_queue **async_cfqq = NULL; |
15c31be4d cfq-iosched: fix ... |
1352 |
struct cfq_queue *cfqq = NULL; |
c2dea2d1f cfq: async queue ... |
1353 1354 1355 1356 |
if (!is_sync) { async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio); cfqq = *async_cfqq; } |
15c31be4d cfq-iosched: fix ... |
1357 1358 1359 1360 1361 1362 |
if (!cfqq) cfqq = cfq_find_alloc_queue(cfqd, is_sync, tsk, gfp_mask); /* * pin the queue now that it's allocated, scheduler exit will prune it */ |
c2dea2d1f cfq: async queue ... |
1363 |
if (!is_sync && !(*async_cfqq)) { |
15c31be4d cfq-iosched: fix ... |
1364 |
atomic_inc(&cfqq->ref); |
c2dea2d1f cfq: async queue ... |
1365 |
*async_cfqq = cfqq; |
15c31be4d cfq-iosched: fix ... |
1366 1367 1368 1369 1370 |
} atomic_inc(&cfqq->ref); return cfqq; } |
498d3aa2b [PATCH] cfq-iosch... |
1371 1372 1373 |
/* * We drop cfq io contexts lazily, so we may find a dead one. */ |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1374 1375 1376 |
static void cfq_drop_dead_cic(struct io_context *ioc, struct cfq_io_context *cic) { |
fc46379da [PATCH] cfq-iosch... |
1377 |
WARN_ON(!list_empty(&cic->queue_list)); |
597bc485d cfq-iosched: spee... |
1378 1379 1380 |
if (ioc->ioc_data == cic) ioc->ioc_data = NULL; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1381 |
rb_erase(&cic->rb_node, &ioc->cic_root); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1382 |
kmem_cache_free(cfq_ioc_pool, cic); |
4050cf167 [PATCH] cfq-iosch... |
1383 |
elv_ioc_count_dec(ioc_count); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1384 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1385 1386 1387 |
static struct cfq_io_context * cfq_cic_rb_lookup(struct cfq_data *cfqd, struct io_context *ioc) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1388 |
struct rb_node *n; |
e2d74ac06 [PATCH] [BLOCK] c... |
1389 |
struct cfq_io_context *cic; |
be3b07535 [PATCH] cfq: Furt... |
1390 |
void *k, *key = cfqd; |
e2d74ac06 [PATCH] [BLOCK] c... |
1391 |
|
91fac317a cfq-iosched: get ... |
1392 1393 |
if (unlikely(!ioc)) return NULL; |
597bc485d cfq-iosched: spee... |
1394 1395 1396 1397 1398 1399 |
/* * we maintain a last-hit cache, to avoid browsing over the tree */ cic = ioc->ioc_data; if (cic && cic->key == cfqd) return cic; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1400 1401 |
restart: n = ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1402 1403 |
while (n) { cic = rb_entry(n, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1404 1405 1406 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = cic->key; if (unlikely(!k)) { |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1407 1408 1409 |
cfq_drop_dead_cic(ioc, cic); goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1410 |
|
be3b07535 [PATCH] cfq: Furt... |
1411 |
if (key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1412 |
n = n->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1413 |
else if (key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1414 |
n = n->rb_right; |
597bc485d cfq-iosched: spee... |
1415 1416 |
else { ioc->ioc_data = cic; |
e2d74ac06 [PATCH] [BLOCK] c... |
1417 |
return cic; |
597bc485d cfq-iosched: spee... |
1418 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1419 1420 1421 1422 1423 1424 1425 1426 1427 |
} 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: ... |
1428 1429 |
struct rb_node **p; struct rb_node *parent; |
e2d74ac06 [PATCH] [BLOCK] c... |
1430 |
struct cfq_io_context *__cic; |
0261d6886 [PATCH] CFQ: use ... |
1431 |
unsigned long flags; |
be3b07535 [PATCH] cfq: Furt... |
1432 |
void *k; |
e2d74ac06 [PATCH] [BLOCK] c... |
1433 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1434 1435 |
cic->ioc = ioc; cic->key = cfqd; |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1436 1437 1438 |
restart: parent = NULL; p = &ioc->cic_root.rb_node; |
e2d74ac06 [PATCH] [BLOCK] c... |
1439 1440 1441 |
while (*p) { parent = *p; __cic = rb_entry(parent, struct cfq_io_context, rb_node); |
be3b07535 [PATCH] cfq: Furt... |
1442 1443 1444 |
/* ->key must be copied to avoid race with cfq_exit_queue() */ k = __cic->key; if (unlikely(!k)) { |
be33c3a67 [PATCH] cfq_cic_l... |
1445 |
cfq_drop_dead_cic(ioc, __cic); |
dbecf3ab4 [PATCH 2/2] cfq: ... |
1446 1447 |
goto restart; } |
e2d74ac06 [PATCH] [BLOCK] c... |
1448 |
|
be3b07535 [PATCH] cfq: Furt... |
1449 |
if (cic->key < k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1450 |
p = &(*p)->rb_left; |
be3b07535 [PATCH] cfq: Furt... |
1451 |
else if (cic->key > k) |
e2d74ac06 [PATCH] [BLOCK] c... |
1452 1453 1454 1455 1456 1457 1458 |
p = &(*p)->rb_right; else BUG(); } rb_link_node(&cic->rb_node, parent, p); rb_insert_color(&cic->rb_node, &ioc->cic_root); |
fc46379da [PATCH] cfq-iosch... |
1459 |
|
0261d6886 [PATCH] CFQ: use ... |
1460 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
1461 |
list_add(&cic->queue_list, &cfqd->cic_list); |
0261d6886 [PATCH] CFQ: use ... |
1462 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); |
e2d74ac06 [PATCH] [BLOCK] c... |
1463 |
} |
1da177e4c Linux-2.6.12-rc2 |
1464 1465 1466 |
/* * 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... |
1467 |
* than one device managed by cfq. |
1da177e4c Linux-2.6.12-rc2 |
1468 1469 |
*/ static struct cfq_io_context * |
e2d74ac06 [PATCH] [BLOCK] c... |
1470 |
cfq_get_io_context(struct cfq_data *cfqd, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1471 |
{ |
22e2c507c [PATCH] Update cf... |
1472 |
struct io_context *ioc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1473 |
struct cfq_io_context *cic; |
1da177e4c Linux-2.6.12-rc2 |
1474 |
|
22e2c507c [PATCH] Update cf... |
1475 |
might_sleep_if(gfp_mask & __GFP_WAIT); |
1da177e4c Linux-2.6.12-rc2 |
1476 |
|
b5deef901 [PATCH] Make sure... |
1477 |
ioc = get_io_context(gfp_mask, cfqd->queue->node); |
1da177e4c Linux-2.6.12-rc2 |
1478 1479 |
if (!ioc) return NULL; |
e2d74ac06 [PATCH] [BLOCK] c... |
1480 1481 1482 |
cic = cfq_cic_rb_lookup(cfqd, ioc); if (cic) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1483 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1484 1485 1486 |
cic = cfq_alloc_io_context(cfqd, gfp_mask); if (cic == NULL) goto err; |
1da177e4c Linux-2.6.12-rc2 |
1487 |
|
e2d74ac06 [PATCH] [BLOCK] c... |
1488 |
cfq_cic_link(cfqd, ioc, cic); |
1da177e4c Linux-2.6.12-rc2 |
1489 |
out: |
fc46379da [PATCH] cfq-iosch... |
1490 1491 1492 |
smp_read_barrier_depends(); if (unlikely(ioc->ioprio_changed)) cfq_ioc_set_ioprio(ioc); |
1da177e4c Linux-2.6.12-rc2 |
1493 1494 1495 1496 1497 |
return cic; err: put_io_context(ioc); return NULL; } |
22e2c507c [PATCH] Update cf... |
1498 1499 |
static void cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic) |
1da177e4c Linux-2.6.12-rc2 |
1500 |
{ |
aaf1228dd cfq-iosched: remo... |
1501 1502 |
unsigned long elapsed = jiffies - cic->last_end_request; unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle); |
db3b5848e When cfq I/O sche... |
1503 |
|
22e2c507c [PATCH] Update cf... |
1504 1505 1506 1507 |
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 |
1508 |
|
206dc69b3 [BLOCK] cfq-iosch... |
1509 |
static void |
6d048f531 cfq-iosched: deve... |
1510 1511 |
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic, struct request *rq) |
206dc69b3 [BLOCK] cfq-iosch... |
1512 1513 1514 |
{ sector_t sdist; u64 total; |
5e7053747 [PATCH] cfq-iosch... |
1515 1516 |
if (cic->last_request_pos < rq->sector) sdist = rq->sector - cic->last_request_pos; |
206dc69b3 [BLOCK] cfq-iosch... |
1517 |
else |
5e7053747 [PATCH] cfq-iosch... |
1518 |
sdist = cic->last_request_pos - rq->sector; |
206dc69b3 [BLOCK] cfq-iosch... |
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 |
/* * 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 |
1535 |
|
22e2c507c [PATCH] Update cf... |
1536 1537 1538 1539 1540 1541 1542 1543 |
/* * 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) { |
1be92f2fc cfq-iosched: neve... |
1544 1545 1546 1547 1548 1549 |
int enable_idle; if (!cfq_cfqq_sync(cfqq)) return; enable_idle = cfq_cfqq_idle_window(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1550 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1551 1552 |
if (!cic->ioc->task || !cfqd->cfq_slice_idle || (cfqd->hw_tag && CIC_SEEKY(cic))) |
22e2c507c [PATCH] Update cf... |
1553 1554 1555 1556 1557 1558 |
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 |
1559 |
} |
3b18152c3 [PATCH] CFQ io sc... |
1560 1561 1562 1563 |
if (enable_idle) cfq_mark_cfqq_idle_window(cfqq); else cfq_clear_cfqq_idle_window(cfqq); |
22e2c507c [PATCH] Update cf... |
1564 |
} |
1da177e4c Linux-2.6.12-rc2 |
1565 |
|
22e2c507c [PATCH] Update cf... |
1566 1567 1568 1569 1570 1571 |
/* * Check if new_cfqq should preempt the currently active queue. Return 0 for * no or if we aren't sure, a 1 will cause a preempt. */ static int cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, |
5e7053747 [PATCH] cfq-iosch... |
1572 |
struct request *rq) |
22e2c507c [PATCH] Update cf... |
1573 |
{ |
6d048f531 cfq-iosched: deve... |
1574 |
struct cfq_queue *cfqq; |
22e2c507c [PATCH] Update cf... |
1575 |
|
6d048f531 cfq-iosched: deve... |
1576 1577 |
cfqq = cfqd->active_queue; if (!cfqq) |
22e2c507c [PATCH] Update cf... |
1578 |
return 0; |
6d048f531 cfq-iosched: deve... |
1579 1580 1581 1582 |
if (cfq_slice_used(cfqq)) return 1; if (cfq_class_idle(new_cfqq)) |
caaa5f9f0 [PATCH] cfq-iosch... |
1583 |
return 0; |
22e2c507c [PATCH] Update cf... |
1584 1585 1586 |
if (cfq_class_idle(cfqq)) return 1; |
1e3335de0 cfq-iosched: impr... |
1587 |
|
22e2c507c [PATCH] Update cf... |
1588 |
/* |
374f84ac3 [PATCH] cfq-iosch... |
1589 1590 1591 |
* if the new request is sync, but the currently running queue is * not, let the sync request have priority. */ |
5e7053747 [PATCH] cfq-iosch... |
1592 |
if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq)) |
22e2c507c [PATCH] Update cf... |
1593 |
return 1; |
1e3335de0 cfq-iosched: impr... |
1594 |
|
374f84ac3 [PATCH] cfq-iosch... |
1595 1596 1597 1598 1599 1600 |
/* * So both queues are sync. Let the new request get disk time if * it's a metadata request and the current queue is doing regular IO. */ if (rq_is_meta(rq) && !cfqq->meta_pending) return 1; |
22e2c507c [PATCH] Update cf... |
1601 |
|
1e3335de0 cfq-iosched: impr... |
1602 1603 1604 1605 1606 1607 1608 |
if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq)) return 0; /* * if this request is as-good as one we would expect from the * current cfqq, let it preempt */ |
6d048f531 cfq-iosched: deve... |
1609 |
if (cfq_rq_close(cfqd, rq)) |
1e3335de0 cfq-iosched: impr... |
1610 |
return 1; |
22e2c507c [PATCH] Update cf... |
1611 1612 1613 1614 1615 1616 1617 1618 1619 |
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) { |
6084cdda0 cfq-iosched: don'... |
1620 |
cfq_slice_expired(cfqd, 1); |
22e2c507c [PATCH] Update cf... |
1621 |
|
bf5722567 [PATCH] cfq-iosch... |
1622 1623 1624 1625 1626 |
/* * Put the new queue at the front of the of the current list, * so we know that it will be selected next. */ BUG_ON(!cfq_cfqq_on_rr(cfqq)); |
edd75ffd9 cfq-iosched: get ... |
1627 1628 |
cfq_service_tree_add(cfqd, cfqq, 1); |
bf5722567 [PATCH] cfq-iosch... |
1629 |
|
44f7c1606 cfq-iosched: defe... |
1630 1631 |
cfqq->slice_end = 0; cfq_mark_cfqq_slice_new(cfqq); |
22e2c507c [PATCH] Update cf... |
1632 1633 1634 |
} /* |
5e7053747 [PATCH] cfq-iosch... |
1635 |
* Called when a new fs request (rq) is added (to cfqq). Check if there's |
22e2c507c [PATCH] Update cf... |
1636 1637 1638 |
* something we should do about it */ static void |
5e7053747 [PATCH] cfq-iosch... |
1639 1640 |
cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct request *rq) |
22e2c507c [PATCH] Update cf... |
1641 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1642 |
struct cfq_io_context *cic = RQ_CIC(rq); |
12e9fddd6 [PATCH] cfq-iosch... |
1643 |
|
374f84ac3 [PATCH] cfq-iosch... |
1644 1645 |
if (rq_is_meta(rq)) cfqq->meta_pending++; |
9c2c38a12 [PATCH] cfq-iosch... |
1646 |
cfq_update_io_thinktime(cfqd, cic); |
6d048f531 cfq-iosched: deve... |
1647 |
cfq_update_io_seektime(cfqd, cic, rq); |
9c2c38a12 [PATCH] cfq-iosch... |
1648 |
cfq_update_idle_window(cfqd, cfqq, cic); |
5e7053747 [PATCH] cfq-iosch... |
1649 |
cic->last_request_pos = rq->sector + rq->nr_sectors; |
22e2c507c [PATCH] Update cf... |
1650 1651 1652 1653 1654 1655 1656 |
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... |
1657 1658 |
if (cfq_cfqq_wait_request(cfqq)) { cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1659 |
del_timer(&cfqd->idle_slice_timer); |
dc72ef4ae [PATCH] Add blk_s... |
1660 |
blk_start_queueing(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
1661 |
} |
5e7053747 [PATCH] cfq-iosch... |
1662 |
} else if (cfq_should_preempt(cfqd, cfqq, rq)) { |
22e2c507c [PATCH] Update cf... |
1663 1664 1665 1666 1667 1668 |
/* * 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... |
1669 |
cfq_mark_cfqq_must_dispatch(cfqq); |
dc72ef4ae [PATCH] Add blk_s... |
1670 |
blk_start_queueing(cfqd->queue); |
22e2c507c [PATCH] Update cf... |
1671 |
} |
1da177e4c Linux-2.6.12-rc2 |
1672 |
} |
165125e1e [BLOCK] Get rid o... |
1673 |
static void cfq_insert_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1674 |
{ |
b4878f245 [PATCH] 02/05: up... |
1675 |
struct cfq_data *cfqd = q->elevator->elevator_data; |
5e7053747 [PATCH] cfq-iosch... |
1676 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
22e2c507c [PATCH] Update cf... |
1677 1678 |
cfq_init_prio_data(cfqq); |
1da177e4c Linux-2.6.12-rc2 |
1679 |
|
5e7053747 [PATCH] cfq-iosch... |
1680 |
cfq_add_rq_rb(rq); |
1da177e4c Linux-2.6.12-rc2 |
1681 |
|
22e2c507c [PATCH] Update cf... |
1682 |
list_add_tail(&rq->queuelist, &cfqq->fifo); |
5e7053747 [PATCH] cfq-iosch... |
1683 |
cfq_rq_enqueued(cfqd, cfqq, rq); |
1da177e4c Linux-2.6.12-rc2 |
1684 |
} |
165125e1e [BLOCK] Get rid o... |
1685 |
static void cfq_completed_request(struct request_queue *q, struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1686 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1687 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
b4878f245 [PATCH] 02/05: up... |
1688 |
struct cfq_data *cfqd = cfqq->cfqd; |
5380a101d [PATCH] cfq-iosch... |
1689 |
const int sync = rq_is_sync(rq); |
b4878f245 [PATCH] 02/05: up... |
1690 |
unsigned long now; |
1da177e4c Linux-2.6.12-rc2 |
1691 |
|
b4878f245 [PATCH] 02/05: up... |
1692 |
now = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
1693 |
|
b4878f245 [PATCH] 02/05: up... |
1694 |
WARN_ON(!cfqd->rq_in_driver); |
6d048f531 cfq-iosched: deve... |
1695 |
WARN_ON(!cfqq->dispatched); |
b4878f245 [PATCH] 02/05: up... |
1696 |
cfqd->rq_in_driver--; |
6d048f531 cfq-iosched: deve... |
1697 |
cfqq->dispatched--; |
1da177e4c Linux-2.6.12-rc2 |
1698 |
|
3ed9a2965 cfq-iosched: impr... |
1699 1700 |
if (cfq_cfqq_sync(cfqq)) cfqd->sync_flight--; |
b4878f245 [PATCH] 02/05: up... |
1701 1702 |
if (!cfq_class_idle(cfqq)) cfqd->last_end_request = now; |
3b18152c3 [PATCH] CFQ io sc... |
1703 |
|
caaa5f9f0 [PATCH] cfq-iosch... |
1704 |
if (sync) |
5e7053747 [PATCH] cfq-iosch... |
1705 |
RQ_CIC(rq)->last_end_request = now; |
caaa5f9f0 [PATCH] cfq-iosch... |
1706 1707 1708 1709 1710 1711 |
/* * 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) { |
44f7c1606 cfq-iosched: defe... |
1712 1713 1714 1715 1716 |
if (cfq_cfqq_slice_new(cfqq)) { cfq_set_prio_slice(cfqd, cfqq); cfq_clear_cfqq_slice_new(cfqq); } if (cfq_slice_used(cfqq)) |
6084cdda0 cfq-iosched: don'... |
1717 |
cfq_slice_expired(cfqd, 1); |
6d048f531 cfq-iosched: deve... |
1718 1719 |
else if (sync && RB_EMPTY_ROOT(&cfqq->sort_list)) cfq_arm_slice_timer(cfqd); |
caaa5f9f0 [PATCH] cfq-iosch... |
1720 |
} |
6d048f531 cfq-iosched: deve... |
1721 1722 1723 |
if (!cfqd->rq_in_driver) cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
1724 |
} |
22e2c507c [PATCH] Update cf... |
1725 1726 1727 1728 1729 |
/* * 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 |
1730 |
{ |
22e2c507c [PATCH] Update cf... |
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
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; } |
22e2c507c [PATCH] Update cf... |
1749 |
} |
1da177e4c Linux-2.6.12-rc2 |
1750 |
|
89850f7ee [PATCH] cfq-iosch... |
1751 |
static inline int __cfq_may_queue(struct cfq_queue *cfqq) |
22e2c507c [PATCH] Update cf... |
1752 |
{ |
3b18152c3 [PATCH] CFQ io sc... |
1753 |
if ((cfq_cfqq_wait_request(cfqq) || cfq_cfqq_must_alloc(cfqq)) && |
99f95e528 [PATCH] cfq build... |
1754 |
!cfq_cfqq_must_alloc_slice(cfqq)) { |
3b18152c3 [PATCH] CFQ io sc... |
1755 |
cfq_mark_cfqq_must_alloc_slice(cfqq); |
22e2c507c [PATCH] Update cf... |
1756 |
return ELV_MQUEUE_MUST; |
3b18152c3 [PATCH] CFQ io sc... |
1757 |
} |
1da177e4c Linux-2.6.12-rc2 |
1758 |
|
22e2c507c [PATCH] Update cf... |
1759 |
return ELV_MQUEUE_MAY; |
22e2c507c [PATCH] Update cf... |
1760 |
} |
165125e1e [BLOCK] Get rid o... |
1761 |
static int cfq_may_queue(struct request_queue *q, int rw) |
22e2c507c [PATCH] Update cf... |
1762 1763 1764 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; |
91fac317a cfq-iosched: get ... |
1765 |
struct cfq_io_context *cic; |
22e2c507c [PATCH] Update cf... |
1766 1767 1768 1769 1770 1771 1772 1773 |
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 */ |
91fac317a cfq-iosched: get ... |
1774 1775 1776 1777 1778 |
cic = cfq_cic_rb_lookup(cfqd, tsk->io_context); if (!cic) return ELV_MQUEUE_MAY; cfqq = cic_to_cfqq(cic, rw & REQ_RW_SYNC); |
22e2c507c [PATCH] Update cf... |
1779 1780 1781 |
if (cfqq) { cfq_init_prio_data(cfqq); cfq_prio_boost(cfqq); |
89850f7ee [PATCH] cfq-iosch... |
1782 |
return __cfq_may_queue(cfqq); |
22e2c507c [PATCH] Update cf... |
1783 1784 1785 |
} return ELV_MQUEUE_MAY; |
1da177e4c Linux-2.6.12-rc2 |
1786 |
} |
1da177e4c Linux-2.6.12-rc2 |
1787 1788 1789 |
/* * queue lock held here */ |
bb37b94c6 [BLOCK] Cleanup u... |
1790 |
static void cfq_put_request(struct request *rq) |
1da177e4c Linux-2.6.12-rc2 |
1791 |
{ |
5e7053747 [PATCH] cfq-iosch... |
1792 |
struct cfq_queue *cfqq = RQ_CFQQ(rq); |
1da177e4c Linux-2.6.12-rc2 |
1793 |
|
5e7053747 [PATCH] cfq-iosch... |
1794 |
if (cfqq) { |
22e2c507c [PATCH] Update cf... |
1795 |
const int rw = rq_data_dir(rq); |
1da177e4c Linux-2.6.12-rc2 |
1796 |
|
22e2c507c [PATCH] Update cf... |
1797 1798 |
BUG_ON(!cfqq->allocated[rw]); cfqq->allocated[rw]--; |
1da177e4c Linux-2.6.12-rc2 |
1799 |
|
5e7053747 [PATCH] cfq-iosch... |
1800 |
put_io_context(RQ_CIC(rq)->ioc); |
1da177e4c Linux-2.6.12-rc2 |
1801 |
|
1da177e4c Linux-2.6.12-rc2 |
1802 |
rq->elevator_private = NULL; |
5e7053747 [PATCH] cfq-iosch... |
1803 |
rq->elevator_private2 = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1804 |
|
1da177e4c Linux-2.6.12-rc2 |
1805 1806 1807 1808 1809 |
cfq_put_queue(cfqq); } } /* |
22e2c507c [PATCH] Update cf... |
1810 |
* Allocate cfq data structures associated with this request. |
1da177e4c Linux-2.6.12-rc2 |
1811 |
*/ |
22e2c507c [PATCH] Update cf... |
1812 |
static int |
165125e1e [BLOCK] Get rid o... |
1813 |
cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1814 1815 |
{ struct cfq_data *cfqd = q->elevator->elevator_data; |
3b18152c3 [PATCH] CFQ io sc... |
1816 |
struct task_struct *tsk = current; |
1da177e4c Linux-2.6.12-rc2 |
1817 1818 |
struct cfq_io_context *cic; const int rw = rq_data_dir(rq); |
7749a8d42 [PATCH] Propagate... |
1819 |
const int is_sync = rq_is_sync(rq); |
22e2c507c [PATCH] Update cf... |
1820 |
struct cfq_queue *cfqq; |
1da177e4c Linux-2.6.12-rc2 |
1821 1822 1823 |
unsigned long flags; might_sleep_if(gfp_mask & __GFP_WAIT); |
e2d74ac06 [PATCH] [BLOCK] c... |
1824 |
cic = cfq_get_io_context(cfqd, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1825 |
|
1da177e4c Linux-2.6.12-rc2 |
1826 |
spin_lock_irqsave(q->queue_lock, flags); |
22e2c507c [PATCH] Update cf... |
1827 1828 |
if (!cic) goto queue_fail; |
91fac317a cfq-iosched: get ... |
1829 1830 1831 |
cfqq = cic_to_cfqq(cic, is_sync); if (!cfqq) { cfqq = cfq_get_queue(cfqd, is_sync, tsk, gfp_mask); |
22e2c507c [PATCH] Update cf... |
1832 1833 |
if (!cfqq) goto queue_fail; |
1da177e4c Linux-2.6.12-rc2 |
1834 |
|
91fac317a cfq-iosched: get ... |
1835 1836 |
cic_set_cfqq(cic, cfqq, is_sync); } |
1da177e4c Linux-2.6.12-rc2 |
1837 1838 |
cfqq->allocated[rw]++; |
3b18152c3 [PATCH] CFQ io sc... |
1839 |
cfq_clear_cfqq_must_alloc(cfqq); |
22e2c507c [PATCH] Update cf... |
1840 |
atomic_inc(&cfqq->ref); |
1da177e4c Linux-2.6.12-rc2 |
1841 |
|
5e7053747 [PATCH] cfq-iosch... |
1842 |
spin_unlock_irqrestore(q->queue_lock, flags); |
3b18152c3 [PATCH] CFQ io sc... |
1843 |
|
5e7053747 [PATCH] cfq-iosch... |
1844 1845 1846 |
rq->elevator_private = cic; rq->elevator_private2 = cfqq; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1847 |
|
22e2c507c [PATCH] Update cf... |
1848 1849 1850 |
queue_fail: if (cic) put_io_context(cic->ioc); |
89850f7ee [PATCH] cfq-iosch... |
1851 |
|
3b18152c3 [PATCH] CFQ io sc... |
1852 |
cfq_schedule_dispatch(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
1853 1854 1855 |
spin_unlock_irqrestore(q->queue_lock, flags); return 1; } |
65f27f384 WorkStruct: Pass ... |
1856 |
static void cfq_kick_queue(struct work_struct *work) |
22e2c507c [PATCH] Update cf... |
1857 |
{ |
65f27f384 WorkStruct: Pass ... |
1858 1859 |
struct cfq_data *cfqd = container_of(work, struct cfq_data, unplug_work); |
165125e1e [BLOCK] Get rid o... |
1860 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
1861 1862 1863 |
unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); |
dc72ef4ae [PATCH] Add blk_s... |
1864 |
blk_start_queueing(q); |
22e2c507c [PATCH] Update cf... |
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 |
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; |
3c6bd2f87 cfq-iosched: chec... |
1876 |
int timed_out = 1; |
22e2c507c [PATCH] Update cf... |
1877 1878 1879 1880 |
spin_lock_irqsave(cfqd->queue->queue_lock, flags); if ((cfqq = cfqd->active_queue) != NULL) { |
3c6bd2f87 cfq-iosched: chec... |
1881 |
timed_out = 0; |
22e2c507c [PATCH] Update cf... |
1882 1883 1884 |
/* * expired */ |
44f7c1606 cfq-iosched: defe... |
1885 |
if (cfq_slice_used(cfqq)) |
22e2c507c [PATCH] Update cf... |
1886 1887 1888 1889 1890 1891 |
goto expire; /* * only expire and reinvoke request handler, if there are * other queues with pending requests */ |
caaa5f9f0 [PATCH] cfq-iosch... |
1892 |
if (!cfqd->busy_queues) |
22e2c507c [PATCH] Update cf... |
1893 |
goto out_cont; |
22e2c507c [PATCH] Update cf... |
1894 1895 1896 1897 |
/* * not expired and it has a request pending, let it dispatch */ |
dd67d0515 [PATCH] rbtree: s... |
1898 |
if (!RB_EMPTY_ROOT(&cfqq->sort_list)) { |
3b18152c3 [PATCH] CFQ io sc... |
1899 |
cfq_mark_cfqq_must_dispatch(cfqq); |
22e2c507c [PATCH] Update cf... |
1900 1901 1902 1903 |
goto out_kick; } } expire: |
6084cdda0 cfq-iosched: don'... |
1904 |
cfq_slice_expired(cfqd, timed_out); |
22e2c507c [PATCH] Update cf... |
1905 |
out_kick: |
3b18152c3 [PATCH] CFQ io sc... |
1906 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 |
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... |
1925 1926 1927 |
if (!time_after_eq(jiffies, end)) mod_timer(&cfqd->idle_class_timer, end); else |
3b18152c3 [PATCH] CFQ io sc... |
1928 |
cfq_schedule_dispatch(cfqd); |
22e2c507c [PATCH] Update cf... |
1929 1930 1931 |
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags); } |
3b18152c3 [PATCH] CFQ io sc... |
1932 1933 1934 1935 1936 1937 |
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... |
1938 |
|
c2dea2d1f cfq: async queue ... |
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 |
static void cfq_put_async_queues(struct cfq_data *cfqd) { int i; for (i = 0; i < IOPRIO_BE_NR; i++) { if (cfqd->async_cfqq[0][i]) cfq_put_queue(cfqd->async_cfqq[0][i]); if (cfqd->async_cfqq[1][i]) cfq_put_queue(cfqd->async_cfqq[1][i]); if (cfqd->async_idle_cfqq) cfq_put_queue(cfqd->async_idle_cfqq); } } |
1da177e4c Linux-2.6.12-rc2 |
1952 1953 |
static void cfq_exit_queue(elevator_t *e) { |
22e2c507c [PATCH] Update cf... |
1954 |
struct cfq_data *cfqd = e->elevator_data; |
165125e1e [BLOCK] Get rid o... |
1955 |
struct request_queue *q = cfqd->queue; |
22e2c507c [PATCH] Update cf... |
1956 |
|
3b18152c3 [PATCH] CFQ io sc... |
1957 |
cfq_shutdown_timer_wq(cfqd); |
e2d74ac06 [PATCH] [BLOCK] c... |
1958 |
|
d9ff41879 [PATCH] make cfq_... |
1959 |
spin_lock_irq(q->queue_lock); |
e2d74ac06 [PATCH] [BLOCK] c... |
1960 |
|
d9ff41879 [PATCH] make cfq_... |
1961 |
if (cfqd->active_queue) |
6084cdda0 cfq-iosched: don'... |
1962 |
__cfq_slice_expired(cfqd, cfqd->active_queue, 0); |
e2d74ac06 [PATCH] [BLOCK] c... |
1963 1964 |
while (!list_empty(&cfqd->cic_list)) { |
d9ff41879 [PATCH] make cfq_... |
1965 1966 1967 |
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next, struct cfq_io_context, queue_list); |
89850f7ee [PATCH] cfq-iosch... |
1968 1969 |
__cfq_exit_single_io_context(cfqd, cic); |
d9ff41879 [PATCH] make cfq_... |
1970 |
} |
e2d74ac06 [PATCH] [BLOCK] c... |
1971 |
|
c2dea2d1f cfq: async queue ... |
1972 |
cfq_put_async_queues(cfqd); |
15c31be4d cfq-iosched: fix ... |
1973 |
|
d9ff41879 [PATCH] make cfq_... |
1974 |
spin_unlock_irq(q->queue_lock); |
a90d742e4 [PATCH] don't bot... |
1975 1976 |
cfq_shutdown_timer_wq(cfqd); |
a90d742e4 [PATCH] don't bot... |
1977 |
kfree(cfqd); |
1da177e4c Linux-2.6.12-rc2 |
1978 |
} |
165125e1e [BLOCK] Get rid o... |
1979 |
static void *cfq_init_queue(struct request_queue *q) |
1da177e4c Linux-2.6.12-rc2 |
1980 1981 |
{ struct cfq_data *cfqd; |
1da177e4c Linux-2.6.12-rc2 |
1982 |
|
94f6030ca Slab allocators: ... |
1983 |
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node); |
1da177e4c Linux-2.6.12-rc2 |
1984 |
if (!cfqd) |
bc1c11697 [PATCH] elevator ... |
1985 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1986 |
|
cc09e2990 [PATCH] cfq-iosch... |
1987 |
cfqd->service_tree = CFQ_RB_ROOT; |
d9ff41879 [PATCH] make cfq_... |
1988 |
INIT_LIST_HEAD(&cfqd->cic_list); |
1da177e4c Linux-2.6.12-rc2 |
1989 |
|
1da177e4c Linux-2.6.12-rc2 |
1990 |
cfqd->queue = q; |
1da177e4c Linux-2.6.12-rc2 |
1991 |
|
22e2c507c [PATCH] Update cf... |
1992 1993 1994 1995 1996 1997 1998 |
init_timer(&cfqd->idle_slice_timer); cfqd->idle_slice_timer.function = cfq_idle_slice_timer; cfqd->idle_slice_timer.data = (unsigned long) cfqd; init_timer(&cfqd->idle_class_timer); cfqd->idle_class_timer.function = cfq_idle_class_timer; cfqd->idle_class_timer.data = (unsigned long) cfqd; |
65f27f384 WorkStruct: Pass ... |
1999 |
INIT_WORK(&cfqd->unplug_work, cfq_kick_queue); |
22e2c507c [PATCH] Update cf... |
2000 |
|
1da177e4c Linux-2.6.12-rc2 |
2001 |
cfqd->cfq_quantum = cfq_quantum; |
22e2c507c [PATCH] Update cf... |
2002 2003 |
cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0]; cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1]; |
1da177e4c Linux-2.6.12-rc2 |
2004 2005 |
cfqd->cfq_back_max = cfq_back_max; cfqd->cfq_back_penalty = cfq_back_penalty; |
22e2c507c [PATCH] Update cf... |
2006 2007 2008 2009 |
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... |
2010 |
|
bc1c11697 [PATCH] elevator ... |
2011 |
return cfqd; |
1da177e4c Linux-2.6.12-rc2 |
2012 2013 2014 2015 |
} static void cfq_slab_kill(void) { |
1da177e4c Linux-2.6.12-rc2 |
2016 2017 2018 2019 2020 2021 2022 2023 |
if (cfq_pool) kmem_cache_destroy(cfq_pool); if (cfq_ioc_pool) kmem_cache_destroy(cfq_ioc_pool); } static int __init cfq_slab_setup(void) { |
0a31bd5f2 KMEM_CACHE(): sim... |
2024 |
cfq_pool = KMEM_CACHE(cfq_queue, 0); |
1da177e4c Linux-2.6.12-rc2 |
2025 2026 |
if (!cfq_pool) goto fail; |
0a31bd5f2 KMEM_CACHE(): sim... |
2027 |
cfq_ioc_pool = KMEM_CACHE(cfq_io_context, 0); |
1da177e4c Linux-2.6.12-rc2 |
2028 2029 2030 2031 2032 2033 2034 2035 |
if (!cfq_ioc_pool) goto fail; return 0; fail: cfq_slab_kill(); return -ENOMEM; } |
1da177e4c Linux-2.6.12-rc2 |
2036 2037 2038 |
/* * sysfs parts below --> */ |
1da177e4c Linux-2.6.12-rc2 |
2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 |
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 |
2054 |
#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
2055 |
static ssize_t __FUNC(elevator_t *e, char *page) \ |
1da177e4c Linux-2.6.12-rc2 |
2056 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
2057 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
2058 2059 2060 2061 2062 2063 |
unsigned int __data = __VAR; \ if (__CONV) \ __data = jiffies_to_msecs(__data); \ return cfq_var_show(__data, (page)); \ } SHOW_FUNCTION(cfq_quantum_show, cfqd->cfq_quantum, 0); |
22e2c507c [PATCH] Update cf... |
2064 2065 |
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... |
2066 2067 |
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... |
2068 2069 2070 2071 |
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 |
2072 2073 2074 |
#undef SHOW_FUNCTION #define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \ |
3d1ab40f4 [PATCH] elevator_... |
2075 |
static ssize_t __FUNC(elevator_t *e, const char *page, size_t count) \ |
1da177e4c Linux-2.6.12-rc2 |
2076 |
{ \ |
3d1ab40f4 [PATCH] elevator_... |
2077 |
struct cfq_data *cfqd = e->elevator_data; \ |
1da177e4c Linux-2.6.12-rc2 |
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 |
unsigned int __data; \ int ret = cfq_var_store(&__data, (page), count); \ if (__data < (MIN)) \ __data = (MIN); \ else if (__data > (MAX)) \ __data = (MAX); \ if (__CONV) \ *(__PTR) = msecs_to_jiffies(__data); \ else \ *(__PTR) = __data; \ return ret; \ } STORE_FUNCTION(cfq_quantum_store, &cfqd->cfq_quantum, 1, UINT_MAX, 0); |
22e2c507c [PATCH] Update cf... |
2091 2092 |
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... |
2093 2094 |
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... |
2095 2096 2097 2098 |
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 |
2099 |
#undef STORE_FUNCTION |
e572ec7e4 [PATCH] fix rmmod... |
2100 2101 2102 2103 2104 |
#define CFQ_ATTR(name) \ __ATTR(name, S_IRUGO|S_IWUSR, cfq_##name##_show, cfq_##name##_store) static struct elv_fs_entry cfq_attrs[] = { CFQ_ATTR(quantum), |
e572ec7e4 [PATCH] fix rmmod... |
2105 2106 2107 2108 2109 2110 2111 2112 |
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... |
2113 |
__ATTR_NULL |
1da177e4c Linux-2.6.12-rc2 |
2114 |
}; |
1da177e4c Linux-2.6.12-rc2 |
2115 2116 2117 2118 2119 |
static struct elevator_type iosched_cfq = { .ops = { .elevator_merge_fn = cfq_merge, .elevator_merged_fn = cfq_merged_request, .elevator_merge_req_fn = cfq_merged_requests, |
da7752650 [PATCH] cfq-iosch... |
2120 |
.elevator_allow_merge_fn = cfq_allow_merge, |
b4878f245 [PATCH] 02/05: up... |
2121 |
.elevator_dispatch_fn = cfq_dispatch_requests, |
1da177e4c Linux-2.6.12-rc2 |
2122 |
.elevator_add_req_fn = cfq_insert_request, |
b4878f245 [PATCH] 02/05: up... |
2123 |
.elevator_activate_req_fn = cfq_activate_request, |
1da177e4c Linux-2.6.12-rc2 |
2124 2125 2126 |
.elevator_deactivate_req_fn = cfq_deactivate_request, .elevator_queue_empty_fn = cfq_queue_empty, .elevator_completed_req_fn = cfq_completed_request, |
21183b07e [PATCH] cfq-iosch... |
2127 2128 |
.elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, |
1da177e4c Linux-2.6.12-rc2 |
2129 2130 2131 2132 2133 |
.elevator_set_req_fn = cfq_set_request, .elevator_put_req_fn = cfq_put_request, .elevator_may_queue_fn = cfq_may_queue, .elevator_init_fn = cfq_init_queue, .elevator_exit_fn = cfq_exit_queue, |
fc46379da [PATCH] cfq-iosch... |
2134 |
.trim = cfq_free_io_context, |
1da177e4c Linux-2.6.12-rc2 |
2135 |
}, |
3d1ab40f4 [PATCH] elevator_... |
2136 |
.elevator_attrs = cfq_attrs, |
1da177e4c Linux-2.6.12-rc2 |
2137 2138 2139 2140 2141 2142 2143 |
.elevator_name = "cfq", .elevator_owner = THIS_MODULE, }; static int __init cfq_init(void) { int ret; |
22e2c507c [PATCH] Update cf... |
2144 2145 2146 2147 2148 2149 2150 |
/* * could be 0 on HZ < 1000 setups */ if (!cfq_slice_async) cfq_slice_async = 1; if (!cfq_slice_idle) cfq_slice_idle = 1; |
1da177e4c Linux-2.6.12-rc2 |
2151 2152 2153 2154 |
if (cfq_slab_setup()) return -ENOMEM; ret = elv_register(&iosched_cfq); |
22e2c507c [PATCH] Update cf... |
2155 2156 |
if (ret) cfq_slab_kill(); |
1da177e4c Linux-2.6.12-rc2 |
2157 |
|
1da177e4c Linux-2.6.12-rc2 |
2158 2159 2160 2161 2162 |
return ret; } static void __exit cfq_exit(void) { |
6e9a4738c [PATCH] completio... |
2163 |
DECLARE_COMPLETION_ONSTACK(all_gone); |
1da177e4c Linux-2.6.12-rc2 |
2164 |
elv_unregister(&iosched_cfq); |
334e94de9 [PATCH] deal with... |
2165 |
ioc_gone = &all_gone; |
fba822722 [PATCH 1/2] iosch... |
2166 2167 |
/* ioc_gone's update must be visible before reading ioc_count */ smp_wmb(); |
4050cf167 [PATCH] cfq-iosch... |
2168 |
if (elv_ioc_count_read(ioc_count)) |
fba822722 [PATCH 1/2] iosch... |
2169 |
wait_for_completion(ioc_gone); |
334e94de9 [PATCH] deal with... |
2170 |
synchronize_rcu(); |
83521d3eb [PATCH] cfq-iosch... |
2171 |
cfq_slab_kill(); |
1da177e4c Linux-2.6.12-rc2 |
2172 2173 2174 2175 2176 2177 2178 2179 |
} module_init(cfq_init); module_exit(cfq_exit); MODULE_AUTHOR("Jens Axboe"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Completely Fair Queueing IO scheduler"); |