From: Jens Axboe <jens.axboe@oracle.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Chris Mason <chris.mason@oracle.com>,
Peter Zijlstra <peterz@infradead.org>,
Artem Bityutskiy <dedekind1@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"david@fromorbit.com" <david@fromorbit.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"jack@suse.cz" <jack@suse.cz>, "Theodore Ts'o" <tytso@mit.edu>
Subject: Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_mb
Date: Wed, 9 Sep 2009 14:37:46 +0200 [thread overview]
Message-ID: <20090909123746.GB18599@kernel.dk> (raw)
In-Reply-To: <20090909123223.GB23006@localhost>
On Wed, Sep 09 2009, Wu Fengguang wrote:
> On Wed, Sep 09, 2009 at 08:28:06PM +0800, Christoph Hellwig wrote:
> > On Wed, Sep 09, 2009 at 05:29:01PM +0800, Wu Fengguang wrote:
> > > It seems that balance_dirty_pages() is not coupled with MAX_WRITEBACK_PAGES.
> > > Instead it uses the much smaller (ratelimit_pages + ratelimit_pages / 2).
> >
> > With Jen's writeback patches applied balance_dirty_pages does not start
> > writeback itself anymore but calls bdi_start_writeback to let the
> > flusher thread do it.
> >
> > it would be good if we do any writeback tuning ontop of these patches..
>
> Ah OK. I'm using latest linux-next and expected his patches to be there..
They are there, have been for months! But I think Christoph is a little
confused, we'll still do writeback inline from balance_dirty_pages(). It
does writeback_inodes_wbc(), which does not schedule async writeout.
So if your patches are based and tested off -next, you should be good.
--
Jens Axboe
next prev parent reply other threads:[~2009-09-09 12:37 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-08 9:23 [PATCH 0/8] Per-bdi writeback flusher threads v19 Jens Axboe
2009-09-08 9:23 ` [PATCH 1/8] writeback: get rid of generic_sync_sb_inodes() export Jens Axboe
2009-09-08 10:27 ` Artem Bityutskiy
2009-09-08 10:27 ` Artem Bityutskiy
2009-09-08 10:41 ` Jens Axboe
2009-09-08 10:52 ` Artem Bityutskiy
2009-09-08 10:57 ` Jens Axboe
2009-09-08 11:01 ` Artem Bityutskiy
2009-09-08 11:01 ` Artem Bityutskiy
2009-09-08 11:05 ` Jens Axboe
2009-09-08 11:31 ` Artem Bityutskiy
2009-09-08 11:31 ` Artem Bityutskiy
2009-09-08 9:23 ` [PATCH 2/8] writeback: move dirty inodes from super_block to backing_dev_info Jens Axboe
2009-09-08 9:23 ` [PATCH 3/8] writeback: switch to per-bdi threads for flushing data Jens Axboe
2009-09-08 13:46 ` Daniel Walker
2009-09-08 14:21 ` Jens Axboe
2009-09-08 9:23 ` [PATCH 4/8] writeback: get rid of pdflush completely Jens Axboe
2009-09-08 9:23 ` [PATCH 5/8] writeback: add some debug inode list counters to bdi stats Jens Axboe
2009-09-08 9:23 ` [PATCH 6/8] writeback: add name to backing_dev_info Jens Axboe
2009-09-08 9:23 ` [PATCH 7/8] writeback: check for registered bdi in flusher add and inode dirty Jens Axboe
2009-09-08 9:23 ` [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_mb Jens Axboe
2009-09-08 10:37 ` Artem Bityutskiy
2009-09-08 10:37 ` Artem Bityutskiy
2009-09-08 16:06 ` Peter Zijlstra
2009-09-08 16:29 ` Chris Mason
2009-09-08 16:56 ` Peter Zijlstra
2009-09-08 17:28 ` Chris Mason
2009-09-08 17:46 ` Peter Zijlstra
2009-09-08 17:55 ` Peter Zijlstra
2009-09-08 18:32 ` Peter Zijlstra
2009-09-09 14:23 ` Jan Kara
2009-09-09 14:37 ` Wu Fengguang
2009-09-10 15:49 ` Peter Zijlstra
2009-09-14 11:17 ` Jan Kara
2009-09-24 8:33 ` Wu Fengguang
2009-09-24 15:38 ` Peter Zijlstra
2009-09-25 1:33 ` Wu Fengguang
2009-09-29 17:35 ` Jan Kara
2009-09-30 1:24 ` Wu Fengguang
2009-09-30 11:55 ` Jan Kara
2009-09-30 12:10 ` Jens Axboe
2009-10-01 15:17 ` Wu Fengguang
2009-10-01 13:36 ` Wu Fengguang
2009-10-01 14:22 ` Jan Kara
2009-10-01 14:54 ` Wu Fengguang
2009-10-01 21:35 ` Jan Kara
2009-10-02 2:25 ` Wu Fengguang
2009-10-02 9:54 ` Jan Kara
2009-10-02 10:34 ` Wu Fengguang
2009-09-08 18:35 ` Chris Mason
2009-09-08 17:57 ` Chris Mason
2009-09-08 18:28 ` Peter Zijlstra
2009-09-09 1:53 ` Dave Chinner
2009-09-09 3:52 ` Wu Fengguang
2009-09-08 18:06 ` Theodore Tso
2009-09-08 18:06 ` Theodore Tso
2009-09-08 18:19 ` Christoph Hellwig
2009-09-08 19:34 ` Theodore Tso
2009-09-09 9:29 ` Wu Fengguang
2009-09-09 9:29 ` Wu Fengguang
2009-09-09 12:28 ` Christoph Hellwig
2009-09-09 12:32 ` Wu Fengguang
2009-09-09 12:36 ` Artem Bityutskiy
2009-09-09 12:36 ` Artem Bityutskiy
2009-09-09 12:37 ` Jens Axboe [this message]
2009-09-09 12:43 ` Christoph Hellwig
2009-09-09 12:44 ` Jens Axboe
2009-09-09 12:51 ` Christoph Hellwig
2009-09-09 12:57 ` Wu Fengguang
-- strict thread matches above, loose matches on Subject: below --
2009-09-04 7:46 [PATCH 0/8] Per-bdi writeback flusher threads v18 Jens Axboe
2009-09-04 7:46 ` [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_mb Jens Axboe
2009-09-04 15:28 ` Richard Kennedy
2009-09-05 13:26 ` Jamie Lokier
2009-09-05 16:18 ` Richard Kennedy
2009-09-05 16:46 ` Theodore Tso
2009-09-07 19:09 ` Jan Kara
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