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| author | Chao Yu <yuchao0@huawei.com> | 2017-08-31 18:56:05 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-09-21 14:15:22 -0700 |
| commit | 3b8bbd990ce57815f0b0b4b60029ba8d173f5912 (patch) | |
| tree | f1674b0a97c8545790447efe8cf0d521202f3287 /tools/perf/scripts/python/Perf-Trace-Util | |
| parent | bc0c8fe8b11e30ac7d881638ed422a7473827bb7 (diff) | |
f2fs: avoid race in between atomic_read & atomic_inc
Previously, we will miss merging flush command during fsync due to below
race condition:
Thread A Thread B Thread C
- f2fs_issue_flush
- atomic_read(&issing_flush)
- f2fs_issue_flush
- atomic_read(&issing_flush)
- f2fs_issue_flush
- atomic_read(&issing_flush)
- atomic_inc(&issing_flush)
- atomic_inc(&issing_flush)
- atomic_inc(&issing_flush)
- submit_flush_wait
- submit_flush_wait
- submit_flush_wait
It needs to use atomic_inc_return instead to avoid such race.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util')
0 files changed, 0 insertions, 0 deletions