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authoralex chen <alex.chen@huawei.com>2015-02-10 14:09:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-10 14:30:29 -0800
commit1dfeb768475dfded66bba03a1744c2e8141d3429 (patch)
treea69b61304f134f9a6435261adeeabd90fbc4c34e /Documentation/filesystems/ocfs2.txt
parent15eba0fe3eeaeb1b80489c1ebb9d47d6d7003f57 (diff)
ocfs2: add a mount option journal_async_commit on ocfs2 filesystem
Add a mount option to support JBD2 feature: JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT. When this feature is opened, journal commit block can be written to disk without waiting for descriptor blocks, which can improve journal commit performance. This option will enable 'journal_checksum' internally. Using the fs_mark benchmark, using journal_async_commit shows a 50% improvement, the files per second go up from 215.2 to 317.5. test script: fs_mark -d /mnt/ocfs2/ -s 10240 -n 1000 default: FSUse% Count Size Files/sec App Overhead 0 1000 10240 215.2 17878 with journal_async_commit option: FSUse% Count Size Files/sec App Overhead 0 1000 10240 317.5 17881 Signed-off-by: Alex Chen <alex.chen@huawei.com> Signed-off-by: Weiwei Wang <wangww631@huawei.comm> Reviewed-by: Joseph Qi <joseph.qi@huawei.com> Reviewed-by: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/ocfs2.txt')
-rw-r--r--Documentation/filesystems/ocfs2.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/filesystems/ocfs2.txt b/Documentation/filesystems/ocfs2.txt
index 7618a287aa41..28f8c08201e2 100644
--- a/Documentation/filesystems/ocfs2.txt
+++ b/Documentation/filesystems/ocfs2.txt
@@ -100,3 +100,7 @@ coherency=full (*) Disallow concurrent O_DIRECT writes, cluster inode
coherency=buffered Allow concurrent O_DIRECT writes without EX lock among
nodes, which gains high performance at risk of getting
stale data on other nodes.
+journal_async_commit Commit block can be written to disk without waiting
+ for descriptor blocks. If enabled older kernels cannot
+ mount the device. This will enable 'journal_checksum'
+ internally.