From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Jens Axboe <jens.axboe@oracle.com>,
akpm@linux-foundation.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@elte.hu>,
thomas.pi@arcor.dea, Yuriy Lalym <ylalym@gmail.com>,
ltt-dev@lists.casi.polymtl.ca, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH] mm fix page writeback accounting to fix oom condition under heavy I/O
Date: Tue, 10 Feb 2009 16:56:13 +1100 [thread overview]
Message-ID: <200902101656.13792.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <alpine.LFD.2.00.0902092120450.3048@localhost.localdomain>
On Tuesday 10 February 2009 16:23:56 Linus Torvalds wrote:
> On Mon, 9 Feb 2009, Mathieu Desnoyers wrote:
> > So this patch fixes this behavior by only decrementing the page
> > accounting _after_ the block I/O writepage has been done.
>
> This makes no sense, really.
>
> Or rather, I don't mind the notion of updating the counters only after IO
> per se, and _that_ part of it probably makes sense. But why is it that you
> only then fix up two of the call-sites. There's a lot more call-sites than
> that for this function.
Well if you do that, then I'd think you also have to change some
calculations that today use dirty+writeback.
In some ways it does make sense, but OTOH it is natural in the
pagecache since it was introduced to treat writeback as basically
equivalent to dirty. So writeback && !dirty pages shouldn't cause
things to blow up, or if it does then hopefully it is a simple
bug somewhere.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2009-02-10 5:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090120122855.GF30821@kernel.dk>
[not found] ` <20090120232748.GA10605@Krystal>
[not found] ` <20090123220009.34DF.KOSAKI.MOTOHIRO@jp.fujitsu.com>
2009-02-10 3:36 ` Mathieu Desnoyers
2009-02-10 3:55 ` Nick Piggin
2009-02-10 5:23 ` Linus Torvalds
2009-02-10 5:56 ` Nick Piggin [this message]
2009-02-10 6:12 ` Mathieu Desnoyers
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=200902101656.13792.nickpiggin@yahoo.com.au \
--to=nickpiggin@yahoo.com.au \
--cc=a.p.zijlstra@chello.nl \
--cc=akpm@linux-foundation.org \
--cc=jens.axboe@oracle.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ltt-dev@lists.casi.polymtl.ca \
--cc=mathieu.desnoyers@polymtl.ca \
--cc=mingo@elte.hu \
--cc=thomas.pi@arcor.dea \
--cc=torvalds@linux-foundation.org \
--cc=ylalym@gmail.com \
/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