From: Jan Kara <jack@suse.cz>
To: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Jan Kara <jack@suse.cz>, Mike Snitzer <snitzer@redhat.com>,
lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org,
dm-devel@redhat.com, linux-scsi@vger.kernel.org, neilb@suse.de
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] a few storage topics
Date: Thu, 19 Jan 2012 00:22:00 +0100 [thread overview]
Message-ID: <20120118232200.GA22019@quack.suse.cz> (raw)
In-Reply-To: <20120118225808.GA3074@tux1.beaverton.ibm.com>
On Wed 18-01-12 14:58:08, Darrick J. Wong wrote:
> On Tue, Jan 17, 2012 at 10:36:48PM +0100, Jan Kara wrote:
> > On Tue 17-01-12 15:06:12, Mike Snitzer wrote:
> > > 5) Any more progress on stable pages?
> > > - I know Darrick Wong had some proposals, what remains?
> > As far as I know this is done for XFS, btrfs, ext4. Is more needed?
>
> Yep, it's done for those three fses.
>
> I suppose it might help some people if instead of wait_on_page_writeback we
> could simply page-migrate all the processes onto a new page...?
Well, but it will cost some more memory & copying so whether it's faster
or not pretty much depends on the workload, doesn't it? Anyway I've already
heard one guy complaining that his RT application does redirtying of mmaped
pages and it started seeing big latencies due to stable pages work. So for
these guys migrating might be an option (or maybe fadvise/madvise flag to
do copy out before submitting for IO?).
> Or possibly modify md-raid5 not to snapshot dirty pages prior to xor/write?
> (I never really bothered to find out if it really does this.)
Not sure either. Neil should know :) (added to CC).
Honze
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2012-01-18 23:22 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABE8wws67dn0fwhTCs_XqH0g_CxGuT+hPQH9cVFe1xx5t_O9Jw@mail.gmail.com>
2012-01-17 20:06 ` [LSF/MM TOPIC] a few storage topics Mike Snitzer
2012-01-17 21:36 ` [Lsf-pc] " Jan Kara
2012-01-18 22:58 ` Darrick J. Wong
2012-01-18 23:22 ` Jan Kara [this message]
2012-01-18 23:42 ` Boaz Harrosh
2012-01-19 9:46 ` Jan Kara
2012-01-19 15:08 ` Andrea Arcangeli
2012-01-19 20:52 ` Jan Kara
2012-01-19 21:39 ` Andrea Arcangeli
2012-01-22 11:31 ` Boaz Harrosh
2012-01-23 16:30 ` Jan Kara
2012-01-22 12:21 ` Boaz Harrosh
2012-01-23 16:18 ` Jan Kara
2012-01-23 17:53 ` Andrea Arcangeli
2012-01-23 18:28 ` Jeff Moyer
2012-01-23 18:56 ` Andrea Arcangeli
2012-01-23 19:19 ` Jeff Moyer
2012-01-24 15:15 ` Chris Mason
2012-01-24 16:56 ` [dm-devel] " Christoph Hellwig
2012-01-24 17:01 ` Andreas Dilger
2012-01-24 17:06 ` [Lsf-pc] [dm-devel] " Andrea Arcangeli
2012-01-24 17:08 ` Chris Mason
2012-01-24 17:08 ` [Lsf-pc] " Andreas Dilger
2012-01-24 18:05 ` [dm-devel] " Jeff Moyer
2012-01-24 18:40 ` Christoph Hellwig
2012-01-24 19:07 ` Chris Mason
2012-01-24 19:14 ` Jeff Moyer
2012-01-24 20:09 ` [Lsf-pc] [dm-devel] " Jan Kara
2012-01-24 20:13 ` [Lsf-pc] " Jeff Moyer
2012-01-24 20:39 ` [Lsf-pc] [dm-devel] " Jan Kara
2012-01-24 20:59 ` Jeff Moyer
2012-01-24 21:08 ` Jan Kara
2012-01-25 3:29 ` Wu Fengguang
2012-01-25 6:15 ` [Lsf-pc] " Andreas Dilger
2012-01-25 6:35 ` [Lsf-pc] [dm-devel] " Wu Fengguang
2012-01-25 14:00 ` Jan Kara
2012-01-26 12:29 ` Andreas Dilger
2012-01-27 17:03 ` Ted Ts'o
2012-01-26 16:25 ` Vivek Goyal
2012-01-26 20:37 ` Jan Kara
2012-01-26 22:34 ` Dave Chinner
2012-01-27 3:27 ` Wu Fengguang
2012-01-27 5:25 ` Andreas Dilger
2012-01-27 7:53 ` Wu Fengguang
2012-01-25 14:33 ` Steven Whitehouse
2012-01-25 14:45 ` Jan Kara
2012-01-25 16:22 ` Loke, Chetan
2012-01-25 16:40 ` Steven Whitehouse
2012-01-25 17:08 ` Loke, Chetan
2012-01-25 17:32 ` James Bottomley
2012-01-25 18:28 ` Loke, Chetan
2012-01-25 18:37 ` Loke, Chetan
2012-01-25 18:37 ` James Bottomley
2012-01-25 20:06 ` Chris Mason
2012-01-25 22:46 ` Andrea Arcangeli
2012-01-25 22:58 ` Jan Kara
2012-01-26 8:59 ` Boaz Harrosh
2012-01-26 16:40 ` Loke, Chetan
2012-01-26 17:00 ` Andreas Dilger
2012-01-26 17:16 ` Loke, Chetan
2012-02-03 12:37 ` Wu Fengguang
2012-01-26 22:38 ` Dave Chinner
2012-01-26 16:17 ` Loke, Chetan
2012-01-25 18:44 ` Boaz Harrosh
2012-02-03 12:55 ` Wu Fengguang
2012-01-24 19:11 ` [dm-devel] [Lsf-pc] " Jeff Moyer
2012-01-26 22:31 ` Dave Chinner
2012-01-24 17:12 ` Jeff Moyer
2012-01-24 17:32 ` Chris Mason
2012-01-24 18:14 ` Jeff Moyer
2012-01-25 0:23 ` NeilBrown
2012-01-25 6:11 ` Andreas Dilger
2012-01-18 23:39 ` Dan Williams
2012-01-24 17:59 ` Martin K. Petersen
2012-01-24 19:48 ` Douglas Gilbert
2012-01-24 20:04 ` Martin K. Petersen
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