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| author | Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> | 2009-06-09 16:47:45 +0900 |
|---|---|---|
| committer | Joel Becker <joel.becker@oracle.com> | 2009-06-09 10:45:47 -0700 |
| commit | e04cc15f52eb072937cec2bbd8499f37afe5e1ef (patch) | |
| tree | 6c1613e6ca90dcb4c71035210bcb0540837abdbc | |
| parent | 06c59bb896ce23c56829f6acf667faebd51dd3b8 (diff) | |
ocfs2: fdatasync should skip unimportant metadata writeout
In ocfs2, fdatasync and fsync are identical.
I think fdatasync should skip committing transaction when
inode->i_state is set just I_DIRTY_SYNC and this indicates
only atime or/and mtime updates.
Following patch improves fdatasync throughput.
#sysbench --num-threads=16 --max-requests=300000 --test=fileio
--file-block-size=4K --file-total-size=16G --file-test-mode=rndwr
--file-fsync-mode=fdatasync run
Results:
-2.6.30-rc8
Test execution summary:
total time: 107.1445s
total number of events: 119559
total time taken by event execution: 116.1050
per-request statistics:
min: 0.0000s
avg: 0.0010s
max: 0.1220s
approx. 95 percentile: 0.0016s
Threads fairness:
events (avg/stddev): 7472.4375/303.60
execution time (avg/stddev): 7.2566/0.64
-2.6.30-rc8-patched
Test execution summary:
total time: 86.8529s
total number of events: 300016
total time taken by event execution: 24.3077
per-request statistics:
min: 0.0000s
avg: 0.0001s
max: 0.0336s
approx. 95 percentile: 0.0001s
Threads fairness:
events (avg/stddev): 18751.0000/718.75
execution time (avg/stddev): 1.5192/0.05
Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
| -rw-r--r-- | fs/ocfs2/file.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 1a96cac3179..07267e0da90 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -187,6 +187,9 @@ static int ocfs2_sync_file(struct file *file, if (err) goto bail; + if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) + goto bail; + journal = osb->journal->j_journal; err = jbd2_journal_force_commit(journal); |