Hisashi Hifumi 3d61f75eef ext3: fdatasync should skip metadata writeout when overwriting ... Currently fdatasync is identical to fsync in ext3. 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 on ext3 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@oss.ntt.co.jp> Acked-by: Jan Kara <jack@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-04-28 08:58:43 -07:00
..
acl.c	ext3: fix wrong gfp type under transaction	2008-03-19 18:53:36 -07:00
acl.h
balloc.c	ext3: replace all adds to little endians variables with le*_add_cpu	2008-02-08 09:22:32 -08:00
bitmap.c	fs: mark nibblemap const	2007-10-17 08:42:47 -07:00
dir.c	Fix 64KB blocksize in ext3 directories	2007-11-14 18:45:43 -08:00
ext3_jbd.c
file.c
fsync.c	ext3: fdatasync should skip metadata writeout when overwriting	2008-04-28 08:58:43 -07:00
hash.c
ialloc.c	ext*: spelling fix prefered -> preferred	2008-04-21 22:45:55 +00:00
inode.c	ext*: spelling fix prefered -> preferred	2008-04-21 22:45:55 +00:00
ioctl.c	[PATCH] r/o bind mounts: elevate write count for ioctls()	2008-04-19 00:29:24 -04:00
Makefile
namei.c	iget: stop EXT3 from using iget() and read_inode()	2008-02-07 08:42:27 -08:00
namei.h
resize.c	ext3: fix wrong gfp type under transaction	2008-03-19 18:53:36 -07:00
super.c	quota: ext3: make ext3 handle quotaon on remount	2008-04-28 08:58:33 -07:00
symlink.c
xattr.c	vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs	2008-04-15 19:35:41 -07:00
xattr.h
xattr_security.c
xattr_trusted.c
xattr_user.c