linux-kernel - [PATCH] f2fs: try grabbing node page lock aggressively in sync scenario

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Date:   Wed, 4 Jul 2018 18:04:10 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>, Yunlei He <heyunlei@...wei.com>
Subject: [PATCH] f2fs: try grabbing node page lock aggressively in sync scenario

In synchronous scenario, like in checkpoint(), we are going to flush
dirty node pages to device synchronously, we can easily failed
writebacking node page due to trylock_page() failure, especially in
condition of intensive lock competition, which can cause long latency
of checkpoint(). So let's use lock_page() in synchronous scenario to
avoid this issue.

Signed-off-by: Yunlei He <heyunlei@...wei.com>
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/node.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index eeee582cee32..237d19eb13b5 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1651,7 +1651,9 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
 						!is_cold_node(page)))
 				continue;
 lock_node:
-			if (!trylock_page(page))
+			if (wbc->sync_mode == WB_SYNC_ALL)
+				lock_page(page);
+			else if (!trylock_page(page))
 				continue;
 
 			if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
-- 
2.18.0.rc1