From: Chao Yu <yuchao0@huawei.com>
To: <jaegeuk@kernel.org>
Cc: <linux-f2fs-devel@lists.sourceforge.net>,
<linux-kernel@vger.kernel.org>, <chao@kernel.org>,
Chao Yu <yuchao0@huawei.com>, Yunlei He <heyunlei@huawei.com>
Subject: [PATCH] f2fs: try grabbing node page lock aggressively in sync scenario
Date: Wed, 4 Jul 2018 18:04:10 +0800 [thread overview]
Message-ID: <20180704100410.20777-1-yuchao0@huawei.com> (raw)
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@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.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
reply other threads:[~2018-07-04 10:05 UTC|newest]
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