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| author | Yunlei He <heyunlei@huawei.com> | 2018-06-21 14:49:06 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-07-27 18:03:59 +0900 |
| commit | 2a63531a612f776ea754fee6272fc8f16a06b9d6 (patch) | |
| tree | e75c0f7748a519b15def83a7985f4aa379c68045 /fs/f2fs/checkpoint.c | |
| parent | 2a96d8ad94ce57cb0072f7a660b1039720c47716 (diff) | |
| download | linux-2a63531a612f776ea754fee6272fc8f16a06b9d6.tar.gz linux-2a63531a612f776ea754fee6272fc8f16a06b9d6.tar.bz2 linux-2a63531a612f776ea754fee6272fc8f16a06b9d6.zip | |
f2fs: fix a hungtask problem caused by congestion_wait
This patch fix hungtask problem which can be reproduced as follow:
Thread 0~3:
while true
do
touch /xxx/test/file_xxx
done
Thread 4 write a new checkpoint every three seconds.
In the meantime, fio start 16 threads for randwrite.
With my debug info, cycles num will exceed 1000 in function
f2fs_sync_dirty_inodes, and most of cycle will be dropped
into congestion_wait() and sleep more than 20ms. Cycles num
reduced to 3 with this patch.
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/checkpoint.c')
| -rw-r--r-- | fs/f2fs/checkpoint.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index 502d7afd71a2..e5cf2ff5b39d 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -972,12 +972,10 @@ retry: iput(inode); /* We need to give cpu to another writers. */ - if (ino == cur_ino) { - congestion_wait(BLK_RW_ASYNC, HZ/50); + if (ino == cur_ino) cond_resched(); - } else { + else ino = cur_ino; - } } else { /* * We should submit bio, since it exists several |