From: Theodore Ts'o <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH 10/12] ext4: fix the number of credits needed for ext4_unlink() and ext4_rmdir()
Date: Mon, 11 Feb 2013 13:30:36 -0500 [thread overview]
Message-ID: <20130211183036.GA9617@thunk.org> (raw)
In-Reply-To: <20130211162830.GM5318@quack.suse.cz>
On Mon, Feb 11, 2013 at 05:28:30PM +0100, Jan Kara wrote:
> On Sat 09-02-13 16:53:50, Ted Tso wrote:
> > The ext4_unlink() and ext4_rmdir() don't actually release the blocks
> > associated with the file/directory. This gets done in a separate jbd2
> > handle called via ext4_evict_inode(). Thus, we don't need to reserve
> > lots of journal credits for the truncate.
> >
> > Note that using too many journal credits is non-optimal because it can
> > leading to the journal transmit getting closed too early, before it is
> > strictly necessary.
> Nice spotting. The patch looks good. You can add:
> Reviewed-by: Jan Kara <jack@suse.cz>
The change in how ext4_unlink() works goes back years and years, so
this patch is applicable to ext3 as well. I imagine a some of these
patches, such as the one where we now can start the handle in
ext4_new_inode(), or changing the order in which we call
grab_cache_page() and journal_start(), will probably be too
complicated for you to feel comfortable backporting them to ext3.
This one is really simple though, so maybe it's worth it.
The other ones you might want to consider is the patches do the
directory lookup before before start the journal, since they are
pretty easy to validate by inspection.
Cheers,
- Ted
next prev parent reply other threads:[~2013-02-11 18:30 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-09 21:53 [PATCH 00/12] jbd2 optimization and bug fixes Theodore Ts'o
2013-02-09 21:53 ` [PATCH 01/12] jbd2: track request delay statistics Theodore Ts'o
2013-02-11 15:57 ` Jan Kara
2013-02-09 21:53 ` [PATCH 02/12] jbd2: revert "jbd2: add COW fields to struct jbd2_journal_handle" Theodore Ts'o
2013-02-11 15:58 ` Jan Kara
2013-02-09 21:53 ` [PATCH 03/12] jbd2: add tracepoints which provide per-handle statistics Theodore Ts'o
2013-02-09 21:53 ` [PATCH 04/12] ext4: move the jbd2 wrapper functions out of super.c Theodore Ts'o
2013-02-09 21:53 ` [PATCH 05/12] ext4: pass context information to jbd2__journal_start() Theodore Ts'o
2013-02-11 16:16 ` Jan Kara
2013-02-11 18:13 ` Theodore Ts'o
2013-02-11 19:58 ` Jan Kara
2013-02-11 20:14 ` Theodore Ts'o
2013-02-09 21:53 ` [PATCH 06/12] ext4: grab page before starting transaction handle in write_begin() Theodore Ts'o
2013-02-11 16:35 ` Jan Kara
2013-02-09 21:53 ` [PATCH 07/12] ext4: start handle at the last possible moment in ext4_unlink() Theodore Ts'o
2013-02-11 16:21 ` Jan Kara
2013-02-09 21:53 ` [PATCH 08/12] ext4: start handle at the last possible moment in ext4_rmdir() Theodore Ts'o
2013-02-11 16:22 ` Jan Kara
2013-02-09 21:53 ` [PATCH 09/12] ext4: fix the number of credits needed for ext4_ext_migrate() Theodore Ts'o
2013-02-11 16:26 ` Jan Kara
2013-02-09 21:53 ` [PATCH 10/12] ext4: fix the number of credits needed for ext4_unlink() and ext4_rmdir() Theodore Ts'o
2013-02-11 16:28 ` Jan Kara
2013-02-11 18:30 ` Theodore Ts'o [this message]
2013-02-11 19:30 ` Jan Kara
2013-02-09 21:53 ` [PATCH 11/12] ext4: fix the number of credits needed for acl ops with inline data Theodore Ts'o
2013-02-10 13:42 ` Tao Ma
2013-02-10 18:15 ` Shentino
2013-02-10 19:43 ` Theodore Ts'o
2013-02-11 16:16 ` Andreas Dilger
2013-02-11 16:30 ` Jan Kara
2013-02-09 21:53 ` [PATCH 12/12] ext4: start handle at the last possible moment when creating inodes Theodore Ts'o
2013-02-11 1:47 ` Theodore Ts'o
2013-02-11 16:00 ` Andreas Dilger
2013-02-11 15:52 ` [PATCH 00/12] jbd2 optimization and bug fixes Jan Kara
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