From: Chris Mason <chris.mason@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
ext4 <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH] Improve buffered streaming write ordering
Date: Fri, 03 Oct 2008 15:45:55 -0400 [thread overview]
Message-ID: <1223063155.13375.64.camel@think.oraclecorp.com> (raw)
In-Reply-To: <20081002234309.GH30001@disturbed>
On Fri, 2008-10-03 at 09:43 +1000, Dave Chinner wrote:
> On Thu, Oct 02, 2008 at 11:48:56PM +0530, Aneesh Kumar K.V wrote:
> > On Thu, Oct 02, 2008 at 08:20:54AM -0400, Chris Mason wrote:
> > > On Wed, 2008-10-01 at 21:52 -0700, Andrew Morton wrote:
> > > For a 4.5GB streaming buffered write, this printk inside
> > > ext4_da_writepage shows up 37,2429 times in /var/log/messages.
> > >
> >
> > Part of that can happen due to shrink_page_list -> pageout -> writepagee
> > call back with lots of unallocated buffer_heads(blocks).
>
> Quite frankly, a simple streaming buffered write should *never*
> trigger writeback from the LRU in memory reclaim.
The blktrace runs on ext4 didn't show kswapd doing any IO. It isn't
clear if this is because ext4 did the redirty trick or if kswapd didn't
call writepage.
-chris
next prev parent reply other threads:[~2008-10-03 19:45 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-01 18:40 [PATCH] Improve buffered streaming write ordering Chris Mason
2008-10-02 4:52 ` Andrew Morton
2008-10-02 12:20 ` Chris Mason
2008-10-02 16:12 ` Chris Mason
2008-10-02 18:18 ` Aneesh Kumar K.V
2008-10-02 19:44 ` Andrew Morton
2008-10-02 23:43 ` Dave Chinner
2008-10-03 19:45 ` Chris Mason [this message]
2008-10-06 10:16 ` Aneesh Kumar K.V
2008-10-06 14:21 ` Chris Mason
2008-10-07 8:45 ` Aneesh Kumar K.V
2008-10-07 9:05 ` Christoph Hellwig
2008-10-07 10:02 ` Aneesh Kumar K.V
2008-10-07 13:29 ` Theodore Tso
2008-10-07 13:36 ` Christoph Hellwig
2008-10-07 14:46 ` Nick Piggin
2008-10-07 13:55 ` Peter Staubach
2008-10-07 14:38 ` Chuck Lever
2008-10-09 15:11 ` Chris Mason
2008-10-10 5:13 ` Dave Chinner
2008-10-03 1:11 ` Chris Mason
2008-10-03 2:43 ` Nick Piggin
2008-10-03 12:07 ` Chris Mason
2008-10-02 18:08 ` Aneesh Kumar K.V
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1223063155.13375.64.camel@think.oraclecorp.com \
--to=chris.mason@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.vnet.ibm.com \
--cc=david@fromorbit.com \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).