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Date: Thu, 07 Feb 2008 15:45:07 +0900 From: Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp> To: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>, adilger@....com Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [RESEND] [PATCH] ext3,4:fdatasync should skip metadata writeout when overwriting >> Signed-off-by :Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp> > Yes, the patch looks fine. You can add >Acked-by: Jan Kara <jack@...e.cz> > if you wish. > Honza Thank you for your comment. Please merge my patch. Thanks. [PATCH] ext3,4:fdatasync should skip metadata writeout when overwriting Currently fdatasync is identical to fsync in ext3,4. I think fdatasync should skip journal flush in data=ordered and data=writeback mode when it overwrites to already-instantiated blocks on HDD. When I_DIRTY_DATASYNC flag is not set, fdatasync should skip journal writeout because this indicates only atime or/and mtime updates. Following patch is the same approach of ext2's fsync code(ext2_sync_file). I did a performance test using the sysbench. #sysbench --num-threads=128 --max-requests=50000 --test=fileio --file-total-size=128G --file-test-mode=rndwr --file-fsync-mode=fdatasync run The result was: -2.6.24 Operations performed: 0 Read, 50080 Write, 59600 Other = 109680 Total Read 0b Written 782.5Mb Total transferred 782.5Mb (12.116Mb/sec) 775.45 Requests/sec executed Test execution summary: total time: 64.5814s total number of events: 50080 total time taken by event execution: 3713.9836 per-request statistics: min: 0.0000s avg: 0.0742s max: 0.9375s approx. 95 percentile: 0.2901s Threads fairness: events (avg/stddev): 391.2500/23.26 execution time (avg/stddev): 29.0155/1.99 -2.6.24-patched Operations performed: 0 Read, 50009 Write, 61596 Other = 111605 Total Read 0b Written 781.39Mb Total transferred 781.39Mb (16.419Mb/sec) 1050.83 Requests/sec executed Test execution summary: total time: 47.5900s total number of events: 50009 total time taken by event execution: 2934.5768 per-request statistics: min: 0.0000s avg: 0.0587s max: 0.8938s approx. 95 percentile: 0.1993s Threads fairness: events (avg/stddev): 390.6953/22.64 execution time (avg/stddev): 22.9264/1.17 Filesystem I/O throughput was improved. Signed-off-by :Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp> Acked-by: Jan Kara <jack@...e.cz> diff -Nrup linux-2.6.24.org/fs/ext3/fsync.c linux-2.6.24/fs/ext3/fsync.c --- linux-2.6.24.org/fs/ext3/fsync.c 2008-01-25 07:58:37.000000000 +0900 +++ linux-2.6.24/fs/ext3/fsync.c 2008-02-04 12:42:42.000000000 +0900 @@ -72,6 +72,9 @@ int ext3_sync_file(struct file * file, s goto out; } + if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) + goto out; + /* * The VFS has written the file data. If the inode is unaltered * then we need not start a commit. diff -Nrup linux-2.6.24.org/fs/ext4/fsync.c linux-2.6.24/fs/ext4/fsync.c --- linux-2.6.24.org/fs/ext4/fsync.c 2008-01-25 07:58:37.000000000 +0900 +++ linux-2.6.24/fs/ext4/fsync.c 2008-02-04 12:43:37.000000000 +0900 @@ -72,6 +72,9 @@ int ext4_sync_file(struct file * file, s goto out; } + if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) + goto out; + /* * The VFS has written the file data. If the inode is unaltered * then we need not start a commit. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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