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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>
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1 changed files with 2 additions and 4 deletions
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@ -972,12 +972,10 @@ int f2fs_sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
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iput(inode);
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/* We need to give cpu to another writers. */
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if (ino == cur_ino) {
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congestion_wait(BLK_RW_ASYNC, HZ/50);
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if (ino == cur_ino)
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cond_resched();
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} else {
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else
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ino = cur_ino;
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}
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} else {
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/*
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* We should submit bio, since it exists several
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