From: Florian-Ewald Mueller <florian-ewald.mueller@ionos.com> mainline inclusion from mainline-v6.11-rc1 commit 3821bbad0d0fbb6c9d77987bd54c89348752056d category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8374 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- 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> Signed-off-by: Li Nan <linan122@huawei.com> --- drivers/md/md.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index d229214393b3..501ff290e013 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8068,7 +8068,8 @@ 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(); } -- 2.39.2