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authorYunlei He <heyunlei@huawei.com>2018-06-21 14:49:06 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2018-07-27 18:03:59 +0900
commit2a63531a612f776ea754fee6272fc8f16a06b9d6 (patch)
treee75c0f7748a519b15def83a7985f4aa379c68045 /tools/perf/scripts/python/call-graph-from-sql.py
parent2a96d8ad94ce57cb0072f7a660b1039720c47716 (diff)
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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