[PATCH 4/7] f2fs: don't wake up too frequently, if there is lots of IOs

[Jaegeuk Kim]

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

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/segment.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index a77f76f528b6..5c7ed0442d6e 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;
-- 
2.19.0.605.g01d371f741-goog