From: Dave Chinner <david@fromorbit.com>
To: Chris Mason <chris.mason@oracle.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"Li, Shaohua" <shaohua.li@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"richard@rsk.demon.co.uk" <richard@rsk.demon.co.uk>,
"jens.axboe@oracle.com" <jens.axboe@oracle.com>
Subject: Re: regression in page writeback
Date: Wed, 30 Sep 2009 09:39:36 +1000 [thread overview]
Message-ID: <20090929233936.GG9464@discord.disaster> (raw)
In-Reply-To: <20090928142524.GC6405@think>
On Mon, Sep 28, 2009 at 10:25:24AM -0400, Chris Mason wrote:
> On Mon, Sep 28, 2009 at 11:07:00AM +1000, Dave Chinner wrote:
> > In the context of the setup I was talking about, I meant is that sync
> > IO _should_ be unthrottled because it is self-throttling by it's
> > very nature. The current code makes no differentiation between the
> > two.
>
> This isn't entirely true anymore. WB_SYNC_ALL is turned into a sync
> bio, which is sent down with higher priority. There may be a few spots
> that still need to be changed for it, but it is much better than it was.
Oh, I didn't realise that had changed - when did WRITE_SYNC_PLUG get
introduced? FWIW, I notice that __block_write_full_page(), gfs2, btrfs
and jdb use WRITE_SYNC_PLUG to implement this, but it appears that
filesystems that have their own writeback code (e.g. XFS) have not
been converted (gfs2 and btrfs being the exceptions).
Oh well, something else that needs tweaking in XFS...
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2009-09-29 23:40 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-22 5:49 regression in page writeback Shaohua Li
2009-09-22 6:40 ` Peter Zijlstra
2009-09-22 8:05 ` Wu Fengguang
2009-09-22 8:09 ` Peter Zijlstra
2009-09-22 8:24 ` Wu Fengguang
2009-09-22 8:32 ` Peter Zijlstra
2009-09-22 8:51 ` Wu Fengguang
2009-09-22 8:52 ` Richard Kennedy
2009-09-22 9:05 ` Wu Fengguang
2009-09-22 11:41 ` Shaohua Li
2009-09-22 15:52 ` Chris Mason
2009-09-23 0:22 ` Wu Fengguang
2009-09-23 0:54 ` Andrew Morton
2009-09-23 1:17 ` Wu Fengguang
2009-09-23 1:27 ` Wu Fengguang
2009-09-23 1:28 ` Andrew Morton
2009-09-23 1:32 ` Wu Fengguang
2009-09-23 1:47 ` Andrew Morton
2009-09-23 2:01 ` Wu Fengguang
2009-09-23 2:09 ` Andrew Morton
2009-09-23 3:07 ` Wu Fengguang
2009-09-23 1:45 ` Wu Fengguang
2009-09-23 1:59 ` Andrew Morton
2009-09-23 2:26 ` Wu Fengguang
2009-09-23 2:36 ` Andrew Morton
2009-09-23 2:49 ` Wu Fengguang
2009-09-23 2:56 ` Andrew Morton
2009-09-23 3:11 ` Wu Fengguang
2009-09-23 3:10 ` Shaohua Li
2009-09-23 3:14 ` Wu Fengguang
2009-09-23 3:25 ` Wu Fengguang
2009-09-23 14:00 ` Chris Mason
2009-09-24 3:15 ` Wu Fengguang
2009-09-24 12:10 ` Chris Mason
2009-09-25 3:26 ` Wu Fengguang
2009-09-25 0:11 ` Dave Chinner
2009-09-25 0:38 ` Chris Mason
2009-09-25 5:04 ` Dave Chinner
2009-09-25 6:45 ` Wu Fengguang
2009-09-28 1:07 ` Dave Chinner
2009-09-28 7:15 ` Wu Fengguang
2009-09-28 13:08 ` Christoph Hellwig
2009-09-28 14:07 ` Theodore Tso
2009-09-30 5:26 ` Wu Fengguang
2009-09-30 5:32 ` Wu Fengguang
2009-10-01 22:17 ` Jan Kara
2009-10-02 3:27 ` Wu Fengguang
2009-10-06 12:55 ` Jan Kara
2009-10-06 13:18 ` Wu Fengguang
2009-09-30 14:11 ` Theodore Tso
2009-10-01 15:14 ` Wu Fengguang
2009-10-01 21:54 ` Theodore Tso
2009-10-02 2:55 ` Wu Fengguang
2009-10-02 8:19 ` Wu Fengguang
2009-10-02 17:26 ` Theodore Tso
2009-10-03 6:10 ` Wu Fengguang
2009-09-29 2:32 ` Wu Fengguang
2009-09-29 14:00 ` Chris Mason
2009-09-29 14:21 ` Christoph Hellwig
2009-09-29 0:15 ` Wu Fengguang
2009-09-28 14:25 ` Chris Mason
2009-09-29 23:39 ` Dave Chinner [this message]
2009-09-30 1:30 ` Wu Fengguang
2009-09-25 12:06 ` Chris Mason
2009-09-25 3:19 ` Wu Fengguang
2009-09-26 1:47 ` Dave Chinner
2009-09-26 3:02 ` Wu Fengguang
2009-09-23 9:19 ` Richard Kennedy
2009-09-23 9:23 ` Peter Zijlstra
2009-09-23 9:37 ` Wu Fengguang
2009-09-23 10:30 ` Wu Fengguang
2009-09-23 6:41 ` Shaohua Li
2009-09-22 10:49 ` Wu Fengguang
2009-09-22 11:50 ` Shaohua Li
2009-09-22 13:39 ` Wu Fengguang
2009-09-23 1:52 ` Shaohua Li
2009-09-23 4:00 ` Wu Fengguang
2009-09-25 6:14 ` Wu Fengguang
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