Merge branch 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-block: [BLOCK] cfq-iosched: seek and async performance fixes [PATCH] ll_rw_blk: fix 80-col offender in put_io_context() [PATCH] cfq-iosched: small cfq_choose_req() optimization [PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to tree
This commit is contained in:
Linus Torvalds
commit
7baf398f12
3 changed files with 222 additions and 182 deletions
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@ -26,18 +26,12 @@ 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 / 100;
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static int cfq_slice_idle = HZ / 70;
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#define CFQ_IDLE_GRACE (HZ / 10)
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#define CFQ_SLICE_SCALE (5)
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#define CFQ_KEY_ASYNC (0)
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#define CFQ_KEY_ANY (0xffff)
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/*
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* disable queueing at the driver/hardware level
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*/
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static const int cfq_max_depth = 2;
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static DEFINE_RWLOCK(cfq_exit_lock);
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@ -102,6 +96,8 @@ static struct completion *ioc_gone;
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#define cfq_cfqq_sync(cfqq) \
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(cfq_cfqq_class_sync(cfqq) || (cfqq)->on_dispatch[SYNC])
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#define sample_valid(samples) ((samples) > 80)
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/*
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* Per block device queue structure
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*/
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@ -170,7 +166,6 @@ struct cfq_data {
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unsigned int cfq_slice[2];
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unsigned int cfq_slice_async_rq;
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unsigned int cfq_slice_idle;
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unsigned int cfq_max_depth;
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struct list_head cic_list;
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};
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@ -343,17 +338,27 @@ static int cfq_queue_empty(request_queue_t *q)
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return !cfqd->busy_queues;
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}
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static inline pid_t cfq_queue_pid(struct task_struct *task, int rw)
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{
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if (rw == READ || process_sync(task))
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return task->pid;
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return CFQ_KEY_ASYNC;
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}
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/*
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* Lifted from AS - choose which of crq1 and crq2 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 are penalized and only allowed to a certain extent.
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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 cfq_rq *
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cfq_choose_req(struct cfq_data *cfqd, struct cfq_rq *crq1, struct cfq_rq *crq2)
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{
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sector_t last, s1, s2, d1 = 0, d2 = 0;
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int r1_wrap = 0, r2_wrap = 0; /* requests are behind the disk head */
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unsigned long back_max;
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#define CFQ_RQ1_WRAP 0x01 /* request 1 wraps */
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#define CFQ_RQ2_WRAP 0x02 /* request 2 wraps */
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unsigned wrap = 0; /* bit mask: requests behind the disk head? */
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if (crq1 == NULL || crq1 == crq2)
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return crq2;
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@ -385,35 +390,47 @@ cfq_choose_req(struct cfq_data *cfqd, struct cfq_rq *crq1, struct cfq_rq *crq2)
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else if (s1 + back_max >= last)
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d1 = (last - s1) * cfqd->cfq_back_penalty;
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else
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r1_wrap = 1;
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wrap |= CFQ_RQ1_WRAP;
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if (s2 >= last)
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d2 = s2 - last;
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else if (s2 + back_max >= last)
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d2 = (last - s2) * cfqd->cfq_back_penalty;
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else
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r2_wrap = 1;
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wrap |= CFQ_RQ2_WRAP;
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/* Found required data */
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if (!r1_wrap && r2_wrap)
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return crq1;
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else if (!r2_wrap && r1_wrap)
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return crq2;
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else if (r1_wrap && r2_wrap) {
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/* both behind the head */
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if (s1 <= s2)
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return crq1;
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else
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return crq2;
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}
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/* Both requests in front of the head */
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if (d1 < d2)
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/*
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* By doing switch() on the bit mask "wrap" we avoid having to
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* check two variables for all permutations: --> faster!
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*/
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switch (wrap) {
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case 0: /* common case for CFQ: crq1 and crq2 not wrapped */
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if (d1 < d2)
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return crq1;
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else if (d2 < d1)
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return crq2;
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else {
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if (s1 >= s2)
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return crq1;
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else
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return crq2;
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}
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case CFQ_RQ2_WRAP:
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return crq1;
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else if (d2 < d1)
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case CFQ_RQ1_WRAP:
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return crq2;
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else {
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if (s1 >= s2)
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case (CFQ_RQ1_WRAP|CFQ_RQ2_WRAP): /* both crqs wrapped */
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default:
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/*
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* Since both rqs are wrapped,
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* start with the one that's further behind head
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* (--> only *one* back seek required),
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* since back seek takes more time than forward.
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*/
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if (s1 <= s2)
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return crq1;
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else
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return crq2;
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@ -612,15 +629,20 @@ cfq_reposition_crq_rb(struct cfq_queue *cfqq, struct cfq_rq *crq)
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cfq_add_crq_rb(crq);
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}
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static struct request *cfq_find_rq_rb(struct cfq_data *cfqd, sector_t sector)
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static struct request *
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cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio)
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{
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struct cfq_queue *cfqq = cfq_find_cfq_hash(cfqd, current->pid, CFQ_KEY_ANY);
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struct task_struct *tsk = current;
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pid_t key = cfq_queue_pid(tsk, bio_data_dir(bio));
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struct cfq_queue *cfqq;
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struct rb_node *n;
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sector_t sector;
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cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio);
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if (!cfqq)
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goto out;
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sector = bio->bi_sector + bio_sectors(bio);
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n = cfqq->sort_list.rb_node;
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while (n) {
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struct cfq_rq *crq = rb_entry_crq(n);
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@ -674,7 +696,7 @@ cfq_merge(request_queue_t *q, struct request **req, struct bio *bio)
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goto out;
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}
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__rq = cfq_find_rq_rb(cfqd, bio->bi_sector + bio_sectors(bio));
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__rq = cfq_find_rq_fmerge(cfqd, bio);
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if (__rq && elv_rq_merge_ok(__rq, bio)) {
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ret = ELEVATOR_FRONT_MERGE;
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goto out;
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@ -877,6 +899,7 @@ static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd)
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static int cfq_arm_slice_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
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{
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struct cfq_io_context *cic;
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unsigned long sl;
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WARN_ON(!RB_EMPTY(&cfqq->sort_list));
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@ -892,13 +915,23 @@ static int cfq_arm_slice_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
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/*
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* task has exited, don't wait
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*/
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if (cfqd->active_cic && !cfqd->active_cic->ioc->task)
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cic = cfqd->active_cic;
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if (!cic || !cic->ioc->task)
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return 0;
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cfq_mark_cfqq_must_dispatch(cfqq);
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cfq_mark_cfqq_wait_request(cfqq);
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sl = min(cfqq->slice_end - 1, (unsigned long) cfqd->cfq_slice_idle);
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/*
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* we don't want to idle for seeks, but we do want to allow
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* fair distribution of slice time for a process doing back-to-back
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* seeks. so allow a little bit of time for him to submit a new rq
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*/
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if (sample_valid(cic->seek_samples) && cic->seek_mean > 131072)
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sl = 2;
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mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
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return 1;
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}
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@ -1115,13 +1148,6 @@ cfq_dispatch_requests(request_queue_t *q, int force)
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if (cfqq) {
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int max_dispatch;
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/*
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* if idle window is disabled, allow queue buildup
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*/
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if (!cfq_cfqq_idle_window(cfqq) &&
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cfqd->rq_in_driver >= cfqd->cfq_max_depth)
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return 0;
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cfq_clear_cfqq_must_dispatch(cfqq);
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cfq_clear_cfqq_wait_request(cfqq);
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del_timer(&cfqd->idle_slice_timer);
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@ -1171,13 +1197,13 @@ __cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned int prio,
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const int hashval)
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{
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struct hlist_head *hash_list = &cfqd->cfq_hash[hashval];
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struct hlist_node *entry, *next;
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struct hlist_node *entry;
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struct cfq_queue *__cfqq;
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hlist_for_each_safe(entry, next, hash_list) {
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struct cfq_queue *__cfqq = list_entry_qhash(entry);
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hlist_for_each_entry(__cfqq, entry, hash_list, cfq_hash) {
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const unsigned short __p = IOPRIO_PRIO_VALUE(__cfqq->org_ioprio_class, __cfqq->org_ioprio);
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if (__cfqq->key == key && (__p == prio || prio == CFQ_KEY_ANY))
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if (__cfqq->key == key && (__p == prio || !prio))
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return __cfqq;
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}
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@ -1190,19 +1216,19 @@ cfq_find_cfq_hash(struct cfq_data *cfqd, unsigned int key, unsigned short prio)
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return __cfq_find_cfq_hash(cfqd, key, prio, hash_long(key, CFQ_QHASH_SHIFT));
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}
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static void cfq_free_io_context(struct cfq_io_context *cic)
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static void cfq_free_io_context(struct io_context *ioc)
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{
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struct cfq_io_context *__cic;
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struct list_head *entry, *next;
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int freed = 1;
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struct rb_node *n;
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int freed = 0;
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list_for_each_safe(entry, next, &cic->list) {
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__cic = list_entry(entry, struct cfq_io_context, list);
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while ((n = rb_first(&ioc->cic_root)) != NULL) {
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__cic = rb_entry(n, struct cfq_io_context, rb_node);
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rb_erase(&__cic->rb_node, &ioc->cic_root);
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kmem_cache_free(cfq_ioc_pool, __cic);
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freed++;
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}
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kmem_cache_free(cfq_ioc_pool, cic);
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if (atomic_sub_and_test(freed, &ioc_count) && ioc_gone)
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complete(ioc_gone);
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}
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@ -1210,8 +1236,7 @@ static void cfq_free_io_context(struct cfq_io_context *cic)
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static void cfq_trim(struct io_context *ioc)
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{
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ioc->set_ioprio = NULL;
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if (ioc->cic)
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cfq_free_io_context(ioc->cic);
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cfq_free_io_context(ioc);
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}
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/*
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@ -1250,26 +1275,26 @@ static void cfq_exit_single_io_context(struct cfq_io_context *cic)
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spin_unlock(q->queue_lock);
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}
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static void cfq_exit_io_context(struct cfq_io_context *cic)
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static void cfq_exit_io_context(struct io_context *ioc)
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{
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struct cfq_io_context *__cic;
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struct list_head *entry;
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unsigned long flags;
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local_irq_save(flags);
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struct rb_node *n;
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/*
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* put the reference this task is holding to the various queues
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*/
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read_lock(&cfq_exit_lock);
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list_for_each(entry, &cic->list) {
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__cic = list_entry(entry, struct cfq_io_context, list);
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read_lock_irqsave(&cfq_exit_lock, flags);
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n = rb_first(&ioc->cic_root);
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while (n != NULL) {
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__cic = rb_entry(n, struct cfq_io_context, rb_node);
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cfq_exit_single_io_context(__cic);
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n = rb_next(n);
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}
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cfq_exit_single_io_context(cic);
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read_unlock(&cfq_exit_lock);
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local_irq_restore(flags);
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read_unlock_irqrestore(&cfq_exit_lock, flags);
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}
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static struct cfq_io_context *
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@ -1278,10 +1303,10 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
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struct cfq_io_context *cic = kmem_cache_alloc(cfq_ioc_pool, gfp_mask);
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if (cic) {
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INIT_LIST_HEAD(&cic->list);
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RB_CLEAR(&cic->rb_node);
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cic->key = NULL;
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cic->cfqq[ASYNC] = NULL;
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cic->cfqq[SYNC] = NULL;
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cic->key = NULL;
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cic->last_end_request = jiffies;
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cic->ttime_total = 0;
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cic->ttime_samples = 0;
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@ -1373,15 +1398,17 @@ static inline void changed_ioprio(struct cfq_io_context *cic)
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static int cfq_ioc_set_ioprio(struct io_context *ioc, unsigned int ioprio)
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{
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struct cfq_io_context *cic;
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struct rb_node *n;
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write_lock(&cfq_exit_lock);
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cic = ioc->cic;
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changed_ioprio(cic);
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list_for_each_entry(cic, &cic->list, list)
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n = rb_first(&ioc->cic_root);
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while (n != NULL) {
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cic = rb_entry(n, struct cfq_io_context, rb_node);
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changed_ioprio(cic);
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n = rb_next(n);
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}
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write_unlock(&cfq_exit_lock);
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|
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@ -1445,14 +1472,67 @@ cfq_get_queue(struct cfq_data *cfqd, unsigned int key, struct task_struct *tsk,
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return cfqq;
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}
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|
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static struct cfq_io_context *
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cfq_cic_rb_lookup(struct cfq_data *cfqd, struct io_context *ioc)
|
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{
|
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struct rb_node *n = ioc->cic_root.rb_node;
|
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struct cfq_io_context *cic;
|
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void *key = cfqd;
|
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|
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while (n) {
|
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cic = rb_entry(n, struct cfq_io_context, rb_node);
|
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|
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if (key < cic->key)
|
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n = n->rb_left;
|
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else if (key > cic->key)
|
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n = n->rb_right;
|
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else
|
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return cic;
|
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}
|
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|
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return NULL;
|
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}
|
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|
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static inline void
|
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cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc,
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struct cfq_io_context *cic)
|
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{
|
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struct rb_node **p = &ioc->cic_root.rb_node;
|
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struct rb_node *parent = NULL;
|
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struct cfq_io_context *__cic;
|
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|
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read_lock(&cfq_exit_lock);
|
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|
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cic->ioc = ioc;
|
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cic->key = cfqd;
|
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|
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ioc->set_ioprio = cfq_ioc_set_ioprio;
|
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|
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while (*p) {
|
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parent = *p;
|
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__cic = rb_entry(parent, struct cfq_io_context, rb_node);
|
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|
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if (cic->key < __cic->key)
|
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p = &(*p)->rb_left;
|
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else if (cic->key > __cic->key)
|
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p = &(*p)->rb_right;
|
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else
|
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BUG();
|
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}
|
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|
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rb_link_node(&cic->rb_node, parent, p);
|
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rb_insert_color(&cic->rb_node, &ioc->cic_root);
|
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list_add(&cic->queue_list, &cfqd->cic_list);
|
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read_unlock(&cfq_exit_lock);
|
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}
|
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|
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/*
|
||||
* 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
|
||||
* than one device managed by cfq. Note that caller is holding a reference to
|
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* cfqq, so we don't need to worry about it disappearing
|
||||
* than one device managed by cfq.
|
||||
*/
|
||||
static struct cfq_io_context *
|
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cfq_get_io_context(struct cfq_data *cfqd, pid_t pid, gfp_t gfp_mask)
|
||||
cfq_get_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
|
||||
{
|
||||
struct io_context *ioc = NULL;
|
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struct cfq_io_context *cic;
|
||||
|
|
@ -1463,88 +1543,15 @@ cfq_get_io_context(struct cfq_data *cfqd, pid_t pid, gfp_t gfp_mask)
|
|||
if (!ioc)
|
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return NULL;
|
||||
|
||||
restart:
|
||||
if ((cic = ioc->cic) == NULL) {
|
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cic = cfq_alloc_io_context(cfqd, gfp_mask);
|
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cic = cfq_cic_rb_lookup(cfqd, ioc);
|
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if (cic)
|
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goto out;
|
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|
||||
if (cic == NULL)
|
||||
goto err;
|
||||
|
||||
/*
|
||||
* manually increment generic io_context usage count, it
|
||||
* cannot go away since we are already holding one ref to it
|
||||
*/
|
||||
cic->ioc = ioc;
|
||||
cic->key = cfqd;
|
||||
read_lock(&cfq_exit_lock);
|
||||
ioc->set_ioprio = cfq_ioc_set_ioprio;
|
||||
ioc->cic = cic;
|
||||
list_add(&cic->queue_list, &cfqd->cic_list);
|
||||
read_unlock(&cfq_exit_lock);
|
||||
} else {
|
||||
struct cfq_io_context *__cic;
|
||||
|
||||
/*
|
||||
* the first cic on the list is actually the head itself
|
||||
*/
|
||||
if (cic->key == cfqd)
|
||||
goto out;
|
||||
|
||||
if (unlikely(!cic->key)) {
|
||||
read_lock(&cfq_exit_lock);
|
||||
if (list_empty(&cic->list))
|
||||
ioc->cic = NULL;
|
||||
else
|
||||
ioc->cic = list_entry(cic->list.next,
|
||||
struct cfq_io_context,
|
||||
list);
|
||||
read_unlock(&cfq_exit_lock);
|
||||
kmem_cache_free(cfq_ioc_pool, cic);
|
||||
atomic_dec(&ioc_count);
|
||||
goto restart;
|
||||
}
|
||||
|
||||
/*
|
||||
* cic exists, check if we already are there. linear search
|
||||
* should be ok here, the list will usually not be more than
|
||||
* 1 or a few entries long
|
||||
*/
|
||||
list_for_each_entry(__cic, &cic->list, list) {
|
||||
/*
|
||||
* this process is already holding a reference to
|
||||
* this queue, so no need to get one more
|
||||
*/
|
||||
if (__cic->key == cfqd) {
|
||||
cic = __cic;
|
||||
goto out;
|
||||
}
|
||||
if (unlikely(!__cic->key)) {
|
||||
read_lock(&cfq_exit_lock);
|
||||
list_del(&__cic->list);
|
||||
read_unlock(&cfq_exit_lock);
|
||||
kmem_cache_free(cfq_ioc_pool, __cic);
|
||||
atomic_dec(&ioc_count);
|
||||
goto restart;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* nope, process doesn't have a cic assoicated with this
|
||||
* cfqq yet. get a new one and add to list
|
||||
*/
|
||||
__cic = cfq_alloc_io_context(cfqd, gfp_mask);
|
||||
if (__cic == NULL)
|
||||
goto err;
|
||||
|
||||
__cic->ioc = ioc;
|
||||
__cic->key = cfqd;
|
||||
read_lock(&cfq_exit_lock);
|
||||
list_add(&__cic->list, &cic->list);
|
||||
list_add(&__cic->queue_list, &cfqd->cic_list);
|
||||
read_unlock(&cfq_exit_lock);
|
||||
cic = __cic;
|
||||
}
|
||||
cic = cfq_alloc_io_context(cfqd, gfp_mask);
|
||||
if (cic == NULL)
|
||||
goto err;
|
||||
|
||||
cfq_cic_link(cfqd, ioc, cic);
|
||||
out:
|
||||
return cic;
|
||||
err:
|
||||
|
|
@ -1577,7 +1584,33 @@ cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic)
|
|||
cic->ttime_mean = (cic->ttime_total + 128) / cic->ttime_samples;
|
||||
}
|
||||
|
||||
#define sample_valid(samples) ((samples) > 80)
|
||||
static void
|
||||
cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic,
|
||||
struct cfq_rq *crq)
|
||||
{
|
||||
sector_t sdist;
|
||||
u64 total;
|
||||
|
||||
if (cic->last_request_pos < crq->request->sector)
|
||||
sdist = crq->request->sector - cic->last_request_pos;
|
||||
else
|
||||
sdist = cic->last_request_pos - crq->request->sector;
|
||||
|
||||
/*
|
||||
* Don't allow the seek distance to get too large from the
|
||||
* odd fragment, pagein, etc
|
||||
*/
|
||||
if (cic->seek_samples <= 60) /* second&third seek */
|
||||
sdist = min(sdist, (cic->seek_mean * 4) + 2*1024*1024);
|
||||
else
|
||||
sdist = min(sdist, (cic->seek_mean * 4) + 2*1024*64);
|
||||
|
||||
cic->seek_samples = (7*cic->seek_samples + 256) / 8;
|
||||
cic->seek_total = (7*cic->seek_total + (u64)256*sdist) / 8;
|
||||
total = cic->seek_total + (cic->seek_samples/2);
|
||||
do_div(total, cic->seek_samples);
|
||||
cic->seek_mean = (sector_t)total;
|
||||
}
|
||||
|
||||
/*
|
||||
* Disable idle window if the process thinks too long or seeks so much that
|
||||
|
|
@ -1690,9 +1723,11 @@ cfq_crq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
|
|||
cic = crq->io_context;
|
||||
|
||||
cfq_update_io_thinktime(cfqd, cic);
|
||||
cfq_update_io_seektime(cfqd, cic, crq);
|
||||
cfq_update_idle_window(cfqd, cfqq, cic);
|
||||
|
||||
cic->last_queue = jiffies;
|
||||
cic->last_request_pos = crq->request->sector + crq->request->nr_sectors;
|
||||
|
||||
if (cfqq == cfqd->active_queue) {
|
||||
/*
|
||||
|
|
@ -1825,14 +1860,6 @@ static void cfq_prio_boost(struct cfq_queue *cfqq)
|
|||
cfq_resort_rr_list(cfqq, 0);
|
||||
}
|
||||
|
||||
static inline pid_t cfq_queue_pid(struct task_struct *task, int rw)
|
||||
{
|
||||
if (rw == READ || process_sync(task))
|
||||
return task->pid;
|
||||
|
||||
return CFQ_KEY_ASYNC;
|
||||
}
|
||||
|
||||
static inline int
|
||||
__cfq_may_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq,
|
||||
struct task_struct *task, int rw)
|
||||
|
|
@ -1965,7 +1992,7 @@ cfq_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
|
|||
|
||||
might_sleep_if(gfp_mask & __GFP_WAIT);
|
||||
|
||||
cic = cfq_get_io_context(cfqd, key, gfp_mask);
|
||||
cic = cfq_get_io_context(cfqd, gfp_mask);
|
||||
|
||||
spin_lock_irqsave(q->queue_lock, flags);
|
||||
|
||||
|
|
@ -2133,11 +2160,14 @@ static void cfq_exit_queue(elevator_t *e)
|
|||
request_queue_t *q = cfqd->queue;
|
||||
|
||||
cfq_shutdown_timer_wq(cfqd);
|
||||
|
||||
write_lock(&cfq_exit_lock);
|
||||
spin_lock_irq(q->queue_lock);
|
||||
|
||||
if (cfqd->active_queue)
|
||||
__cfq_slice_expired(cfqd, cfqd->active_queue, 0);
|
||||
while(!list_empty(&cfqd->cic_list)) {
|
||||
|
||||
while (!list_empty(&cfqd->cic_list)) {
|
||||
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next,
|
||||
struct cfq_io_context,
|
||||
queue_list);
|
||||
|
|
@ -2152,6 +2182,7 @@ static void cfq_exit_queue(elevator_t *e)
|
|||
cic->key = NULL;
|
||||
list_del_init(&cic->queue_list);
|
||||
}
|
||||
|
||||
spin_unlock_irq(q->queue_lock);
|
||||
write_unlock(&cfq_exit_lock);
|
||||
|
||||
|
|
@ -2227,7 +2258,6 @@ static int cfq_init_queue(request_queue_t *q, elevator_t *e)
|
|||
cfqd->cfq_slice[1] = cfq_slice_sync;
|
||||
cfqd->cfq_slice_async_rq = cfq_slice_async_rq;
|
||||
cfqd->cfq_slice_idle = cfq_slice_idle;
|
||||
cfqd->cfq_max_depth = cfq_max_depth;
|
||||
|
||||
return 0;
|
||||
out_crqpool:
|
||||
|
|
@ -2310,7 +2340,6 @@ 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);
|
||||
SHOW_FUNCTION(cfq_max_depth_show, cfqd->cfq_max_depth, 0);
|
||||
#undef SHOW_FUNCTION
|
||||
|
||||
#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \
|
||||
|
|
@ -2339,7 +2368,6 @@ 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);
|
||||
STORE_FUNCTION(cfq_max_depth_store, &cfqd->cfq_max_depth, 1, UINT_MAX, 0);
|
||||
#undef STORE_FUNCTION
|
||||
|
||||
#define CFQ_ATTR(name) \
|
||||
|
|
@ -2356,7 +2384,6 @@ static struct elv_fs_entry cfq_attrs[] = {
|
|||
CFQ_ATTR(slice_async),
|
||||
CFQ_ATTR(slice_async_rq),
|
||||
CFQ_ATTR(slice_idle),
|
||||
CFQ_ATTR(max_depth),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -3539,11 +3539,17 @@ void put_io_context(struct io_context *ioc)
|
|||
BUG_ON(atomic_read(&ioc->refcount) == 0);
|
||||
|
||||
if (atomic_dec_and_test(&ioc->refcount)) {
|
||||
struct cfq_io_context *cic;
|
||||
|
||||
rcu_read_lock();
|
||||
if (ioc->aic && ioc->aic->dtor)
|
||||
ioc->aic->dtor(ioc->aic);
|
||||
if (ioc->cic && ioc->cic->dtor)
|
||||
ioc->cic->dtor(ioc->cic);
|
||||
if (ioc->cic_root.rb_node != NULL) {
|
||||
struct rb_node *n = rb_first(&ioc->cic_root);
|
||||
|
||||
cic = rb_entry(n, struct cfq_io_context, rb_node);
|
||||
cic->dtor(ioc);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
|
||||
kmem_cache_free(iocontext_cachep, ioc);
|
||||
|
|
@ -3556,6 +3562,7 @@ void exit_io_context(void)
|
|||
{
|
||||
unsigned long flags;
|
||||
struct io_context *ioc;
|
||||
struct cfq_io_context *cic;
|
||||
|
||||
local_irq_save(flags);
|
||||
task_lock(current);
|
||||
|
|
@ -3567,9 +3574,11 @@ void exit_io_context(void)
|
|||
|
||||
if (ioc->aic && ioc->aic->exit)
|
||||
ioc->aic->exit(ioc->aic);
|
||||
if (ioc->cic && ioc->cic->exit)
|
||||
ioc->cic->exit(ioc->cic);
|
||||
|
||||
if (ioc->cic_root.rb_node != NULL) {
|
||||
cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
|
||||
cic->exit(ioc);
|
||||
}
|
||||
|
||||
put_io_context(ioc);
|
||||
}
|
||||
|
||||
|
|
@ -3598,7 +3607,7 @@ struct io_context *current_io_context(gfp_t gfp_flags)
|
|||
ret->last_waited = jiffies; /* doesn't matter... */
|
||||
ret->nr_batch_requests = 0; /* because this is 0 */
|
||||
ret->aic = NULL;
|
||||
ret->cic = NULL;
|
||||
ret->cic_root.rb_node = NULL;
|
||||
tsk->io_context = ret;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -55,25 +55,29 @@ struct as_io_context {
|
|||
|
||||
struct cfq_queue;
|
||||
struct cfq_io_context {
|
||||
/*
|
||||
* circular list of cfq_io_contexts belonging to a process io context
|
||||
*/
|
||||
struct list_head list;
|
||||
struct cfq_queue *cfqq[2];
|
||||
struct rb_node rb_node;
|
||||
void *key;
|
||||
|
||||
struct cfq_queue *cfqq[2];
|
||||
|
||||
struct io_context *ioc;
|
||||
|
||||
unsigned long last_end_request;
|
||||
unsigned long last_queue;
|
||||
sector_t last_request_pos;
|
||||
unsigned long last_queue;
|
||||
|
||||
unsigned long ttime_total;
|
||||
unsigned long ttime_samples;
|
||||
unsigned long ttime_mean;
|
||||
|
||||
unsigned int seek_samples;
|
||||
u64 seek_total;
|
||||
sector_t seek_mean;
|
||||
|
||||
struct list_head queue_list;
|
||||
|
||||
void (*dtor)(struct cfq_io_context *);
|
||||
void (*exit)(struct cfq_io_context *);
|
||||
void (*dtor)(struct io_context *); /* destructor */
|
||||
void (*exit)(struct io_context *); /* called on task exit */
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -94,7 +98,7 @@ struct io_context {
|
|||
int nr_batch_requests; /* Number of requests left in the batch */
|
||||
|
||||
struct as_io_context *aic;
|
||||
struct cfq_io_context *cic;
|
||||
struct rb_root cic_root;
|
||||
};
|
||||
|
||||
void put_io_context(struct io_context *ioc);
|
||||
|
|
|
|||
Loading…
Reference in a new issue