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md: add check for sleepers in md_wakeup_thread()

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Check for sleeping thread before attempting its wake_up in
md_wakeup_thread() to avoid unnecessary spinlock contention.

With a 6.1 kernel, fio random read/write tests on many (>= 100)
virtual volumes, of 100 GiB each, on 3 md-raid5s on 8 SSDs each
(building a raid50), show by 3 to 4 % improved IOPS performance.

Signed-off-by: Florian-Ewald Mueller <florian-ewald.mueller@ionos.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20240327114022.74634-1-jinpu.wang@ionos.com
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Florian-Ewald Mueller 2024-03-27 12:40:22 +01:00 committed by Song Liu
parent 151f66bb61
commit 3821bbad0d
1 changed files with 2 additions and 1 deletions
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3
drivers/md/md.c
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@ -8087,7 +8087,8 @@ void md_wakeup_thread(struct md_thread __rcu *thread)
if (t) {
pr_debug("md: waking up MD thread %s.\n", t->tsk->comm);
set_bit(THREAD_WAKEUP, &t->flags);
wake_up(&t->wqueue);
if (wq_has_sleeper(&t->wqueue))
wake_up(&t->wqueue);
}
rcu_read_unlock();
}