From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 25 Jan 2019 18:26:39 +0000 (-0800)
Subject: f2fs: don't wake up too frequently, if there is lots of IOs
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b460866d27089ffaf915a5a3340b4d8c9f079d33;p=linux.git

f2fs: don't wake up too frequently, if there is lots of IOs

Otherwise, it wakes up discard thread which will sleep again by busy IOs
in a loop.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index a77f76f528b61..5c7ed0442d6e2 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -865,7 +865,7 @@ static inline void wake_up_discard_thread(struct f2fs_sb_info *sbi, bool force)
 		}
 	}
 	mutex_unlock(&dcc->cmd_lock);
-	if (!wakeup)
+	if (!wakeup || !is_idle(sbi, DISCARD_TIME))
 		return;
 wake_up:
 	dcc->discard_wake = 1;