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>
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 7d6b7d0..fdbcbfe 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -279,6 +279,8 @@
writes */
OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
+
+ OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15, /* Journal Async Commit */
};
#define OCFS2_OSB_SOFT_RO 0x0001