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f2fs: try grabbing node page lock aggressively in sync scenario

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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>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2018-07-04 18:04:10 +08:00 • committed by Jaegeuk Kim
parent dc1328027b
commit 4b270a8cc5
1 changed files with 3 additions and 1 deletions
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4
fs/f2fs/node.c
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@ -1638,7 +1638,9 @@ next_step:
!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))) {