[Ocfs2-devel] [PATCH] ocfs2: add a mount option journal_async_commit on ocfs2 filesystem

[Andrew Morton]

On Thu, 25 Dec 2014 10:53:05 +0800 alex chen <alex.chen at huawei.com> wrote:

> 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

For some reason this patch is a bit mangled and I had to apply the
first hunk by hand.

>  fs/ocfs2/ocfs2.h |  2 ++
>  fs/ocfs2/super.c | 17 +++++++++++++++++

Documentation/filesystems/ocfs2.txt needs an update.