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md/raid5: split wait_for_stripe and introduce wait_for_quiescent
I noticed heavy spin lock contention at get_active_stripe(), introduced at being wake up stage, where a bunch of processes try to re-hold the spin lock again. After giving some thoughts on this issue, I found the lock could be relieved(and even avoided) if we turn the wait_for_stripe to per waitqueue for each lock hash and make the wake up exclusive: wake up one process each time, which avoids the lock contention naturally. Before go hacking with wait_for_stripe, I found it actually has 2 usages: for the array to enter or leave the quiescent state, and also to wait for an available stripe in each of the hash lists. So this patch splits the first usage off into a separate wait_queue, wait_for_quiescent, and the next patch will turn the second usage into one waitqueue for each hash value, and make it exclusive, to relieve the lock contention. v2: wake_up(wait_for_quiescent) when (active_stripes == 0) Commit log refactor suggestion from Neil. Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
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@ -374,6 +374,8 @@ static void release_inactive_stripe_list(struct r5conf *conf,
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if (do_wakeup) {
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wake_up(&conf->wait_for_stripe);
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if (atomic_read(&conf->active_stripes) == 0)
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wake_up(&conf->wait_for_quiescent);
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if (conf->retry_read_aligned)
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md_wakeup_thread(conf->mddev->thread);
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}
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@ -667,7 +669,7 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
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spin_lock_irq(conf->hash_locks + hash);
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do {
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wait_event_lock_irq(conf->wait_for_stripe,
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wait_event_lock_irq(conf->wait_for_quiescent,
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conf->quiesce == 0 || noquiesce,
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*(conf->hash_locks + hash));
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sh = __find_stripe(conf, sector, conf->generation - previous);
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@ -4760,7 +4762,7 @@ static void raid5_align_endio(struct bio *bi, int error)
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raid_bi, 0);
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bio_endio(raid_bi, 0);
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if (atomic_dec_and_test(&conf->active_aligned_reads))
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wake_up(&conf->wait_for_stripe);
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wake_up(&conf->wait_for_quiescent);
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return;
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}
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@ -4855,7 +4857,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio)
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align_bi->bi_iter.bi_sector += rdev->data_offset;
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spin_lock_irq(&conf->device_lock);
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wait_event_lock_irq(conf->wait_for_stripe,
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wait_event_lock_irq(conf->wait_for_quiescent,
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conf->quiesce == 0,
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conf->device_lock);
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atomic_inc(&conf->active_aligned_reads);
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@ -5699,7 +5701,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
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bio_endio(raid_bio, 0);
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}
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if (atomic_dec_and_test(&conf->active_aligned_reads))
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wake_up(&conf->wait_for_stripe);
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wake_up(&conf->wait_for_quiescent);
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return handled;
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}
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@ -6433,6 +6435,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
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goto abort;
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spin_lock_init(&conf->device_lock);
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seqcount_init(&conf->gen_lock);
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init_waitqueue_head(&conf->wait_for_quiescent);
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init_waitqueue_head(&conf->wait_for_stripe);
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init_waitqueue_head(&conf->wait_for_overlap);
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INIT_LIST_HEAD(&conf->handle_list);
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@ -7466,7 +7469,7 @@ static void raid5_quiesce(struct mddev *mddev, int state)
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* active stripes can drain
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*/
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conf->quiesce = 2;
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wait_event_cmd(conf->wait_for_stripe,
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wait_event_cmd(conf->wait_for_quiescent,
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atomic_read(&conf->active_stripes) == 0 &&
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atomic_read(&conf->active_aligned_reads) == 0,
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unlock_all_device_hash_locks_irq(conf),
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@ -7480,7 +7483,7 @@ static void raid5_quiesce(struct mddev *mddev, int state)
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case 0: /* re-enable writes */
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lock_all_device_hash_locks_irq(conf);
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conf->quiesce = 0;
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wake_up(&conf->wait_for_stripe);
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wake_up(&conf->wait_for_quiescent);
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wake_up(&conf->wait_for_overlap);
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unlock_all_device_hash_locks_irq(conf);
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break;
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@ -511,6 +511,7 @@ struct r5conf {
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struct list_head inactive_list[NR_STRIPE_HASH_LOCKS];
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atomic_t empty_inactive_list_nr;
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struct llist_head released_stripes;
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wait_queue_head_t wait_for_quiescent;
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wait_queue_head_t wait_for_stripe;
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wait_queue_head_t wait_for_overlap;
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unsigned long cache_state;
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