diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-29 11:10:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-29 11:10:56 -0700 |
commit | 6aaf0da8728c55ff627619f933ed161cc89057c6 (patch) | |
tree | 68c5aea6374e0bf56bf9235d4684c0f6c7a29f26 /drivers/md/raid5.c | |
parent | a9730fca9946f3697410479e0ef1bd759ba00a77 (diff) | |
parent | ab16bfc732c436658d13455f28b0b4a2608a7476 (diff) |
Merge tag 'md/4.2' of git://neil.brown.name/md
Pull md updates from Neil Brown:
"A mixed bag
- a few bug fixes
- some performance improvement that decrease lock contention
- some clean-up
Nothing major"
* tag 'md/4.2' of git://neil.brown.name/md:
md: clear Blocked flag on failed devices when array is read-only.
md: unlock mddev_lock on an error path.
md: clear mddev->private when it has been freed.
md: fix a build warning
md/raid5: ignore released_stripes check
md/raid5: per hash value and exclusive wait_for_stripe
md/raid5: split wait_for_stripe and introduce wait_for_quiescent
wait: introduce wait_event_exclusive_cmd
md: convert to kstrto*()
md/raid10: make sync_request_write() call bio_copy_data()
Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r-- | drivers/md/raid5.c | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b6793d2e051f..59e44e99eef3 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -344,7 +344,8 @@ static void release_inactive_stripe_list(struct r5conf *conf, int hash) { int size; - bool do_wakeup = false; + unsigned long do_wakeup = 0; + int i = 0; unsigned long flags; if (hash == NR_STRIPE_HASH_LOCKS) { @@ -365,15 +366,21 @@ static void release_inactive_stripe_list(struct r5conf *conf, !list_empty(list)) atomic_dec(&conf->empty_inactive_list_nr); list_splice_tail_init(list, conf->inactive_list + hash); - do_wakeup = true; + do_wakeup |= 1 << hash; spin_unlock_irqrestore(conf->hash_locks + hash, flags); } size--; hash--; } + for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) { + if (do_wakeup & (1 << i)) + wake_up(&conf->wait_for_stripe[i]); + } + if (do_wakeup) { - wake_up(&conf->wait_for_stripe); + if (atomic_read(&conf->active_stripes) == 0) + wake_up(&conf->wait_for_quiescent); if (conf->retry_read_aligned) md_wakeup_thread(conf->mddev->thread); } @@ -667,15 +674,15 @@ get_active_stripe(struct r5conf *conf, sector_t sector, spin_lock_irq(conf->hash_locks + hash); do { - wait_event_lock_irq(conf->wait_for_stripe, + wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0 || noquiesce, *(conf->hash_locks + hash)); sh = __find_stripe(conf, sector, conf->generation - previous); if (!sh) { if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) { sh = get_free_stripe(conf, hash); - if (!sh && llist_empty(&conf->released_stripes) && - !test_bit(R5_DID_ALLOC, &conf->cache_state)) + if (!sh && !test_bit(R5_DID_ALLOC, + &conf->cache_state)) set_bit(R5_ALLOC_MORE, &conf->cache_state); } @@ -684,14 +691,15 @@ get_active_stripe(struct r5conf *conf, sector_t sector, if (!sh) { set_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); - wait_event_lock_irq( - conf->wait_for_stripe, + wait_event_exclusive_cmd( + conf->wait_for_stripe[hash], !list_empty(conf->inactive_list + hash) && (atomic_read(&conf->active_stripes) < (conf->max_nr_stripes * 3 / 4) || !test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)), - *(conf->hash_locks + hash)); + spin_unlock_irq(conf->hash_locks + hash), + spin_lock_irq(conf->hash_locks + hash)); clear_bit(R5_INACTIVE_BLOCKED, &conf->cache_state); } else { @@ -716,6 +724,9 @@ get_active_stripe(struct r5conf *conf, sector_t sector, } } while (sh == NULL); + if (!list_empty(conf->inactive_list + hash)) + wake_up(&conf->wait_for_stripe[hash]); + spin_unlock_irq(conf->hash_locks + hash); return sh; } @@ -2177,7 +2188,7 @@ static int resize_stripes(struct r5conf *conf, int newsize) cnt = 0; list_for_each_entry(nsh, &newstripes, lru) { lock_device_hash_lock(conf, hash); - wait_event_cmd(conf->wait_for_stripe, + wait_event_exclusive_cmd(conf->wait_for_stripe[hash], !list_empty(conf->inactive_list + hash), unlock_device_hash_lock(conf, hash), lock_device_hash_lock(conf, hash)); @@ -4760,7 +4771,7 @@ static void raid5_align_endio(struct bio *bi, int error) raid_bi, 0); bio_endio(raid_bi, 0); if (atomic_dec_and_test(&conf->active_aligned_reads)) - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); return; } @@ -4855,7 +4866,7 @@ static int chunk_aligned_read(struct mddev *mddev, struct bio * raid_bio) align_bi->bi_iter.bi_sector += rdev->data_offset; spin_lock_irq(&conf->device_lock); - wait_event_lock_irq(conf->wait_for_stripe, + wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0, conf->device_lock); atomic_inc(&conf->active_aligned_reads); @@ -5699,7 +5710,7 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) bio_endio(raid_bio, 0); } if (atomic_dec_and_test(&conf->active_aligned_reads)) - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); return handled; } @@ -6433,7 +6444,10 @@ static struct r5conf *setup_conf(struct mddev *mddev) goto abort; spin_lock_init(&conf->device_lock); seqcount_init(&conf->gen_lock); - init_waitqueue_head(&conf->wait_for_stripe); + init_waitqueue_head(&conf->wait_for_quiescent); + for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++) { + init_waitqueue_head(&conf->wait_for_stripe[i]); + } init_waitqueue_head(&conf->wait_for_overlap); INIT_LIST_HEAD(&conf->handle_list); INIT_LIST_HEAD(&conf->hold_list); @@ -7466,7 +7480,7 @@ static void raid5_quiesce(struct mddev *mddev, int state) * active stripes can drain */ conf->quiesce = 2; - wait_event_cmd(conf->wait_for_stripe, + wait_event_cmd(conf->wait_for_quiescent, atomic_read(&conf->active_stripes) == 0 && atomic_read(&conf->active_aligned_reads) == 0, unlock_all_device_hash_locks_irq(conf), @@ -7480,7 +7494,7 @@ static void raid5_quiesce(struct mddev *mddev, int state) case 0: /* re-enable writes */ lock_all_device_hash_locks_irq(conf); conf->quiesce = 0; - wake_up(&conf->wait_for_stripe); + wake_up(&conf->wait_for_quiescent); wake_up(&conf->wait_for_overlap); unlock_all_device_hash_locks_irq(conf); break; |