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From: Mike Galbraith <mikeg@wen-online.de>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.4.5-ac15
Date: Fri, 22 Jun 2001 11:06:33 +0200 (CEST)	[thread overview]
Message-ID: <Pine.LNX.4.33.0106221043360.226-100000@mikeg.weiden.de> (raw)
In-Reply-To: <Pine.LNX.4.21.0106210226330.14247-100000@freak.distro.conectiva>

On Thu, 21 Jun 2001, Marcelo Tosatti wrote:

> On Thu, 21 Jun 2001, Mike Galbraith wrote:
>
> > On Thu, 21 Jun 2001, Marcelo Tosatti wrote:
> >
> > > >  2  4  2  77084   1524  18396  66904   0 1876   108  2220 2464 66079   198   1
> >                                                                    ^^^^^
> > > Ok, I suspect that GFP_BUFFER allocations are fucking up here (they can't
> > > block on IO, so they loop insanely).
> >
> > Why doesn't the VM hang the syncing of queued IO on these guys via
> > wait_event or such instead of trying to just let the allocation fail?
...
> > Does failing the allocation in fact accomplish more than what I'm
> > (uhoh:) assuming?
>
> No.

hmm..

Jun 18 07:11:36 kernel: reclaim_page: salvaged ref:1 age:0 buf:0 cnt:1
Jun 18 07:11:36 last message repeated 27 times

One thing that _could_ be done about looping allocations is to steal
a page from the clean list ignoring PageReferenced (if you have any).
That would be a very expensive 'rob Peter to pay Paul' trade though.

	-Mike


  parent reply	other threads:[~2001-06-22  9:07 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-15 22:06 Linux 2.4.5-ac15 Alan Cox
2001-06-16 16:48 ` Tom Vier
2001-06-17 18:11 ` Walter Hofmann
2001-06-19  9:19   ` Walter Hofmann
2001-06-20 19:25     ` Adam Sampson
2001-06-19 21:23   ` Walter Hofmann
2001-06-20 19:56     ` Rik van Riel
2001-06-21 15:22       ` Walter Hofmann
2001-06-21  4:35     ` Marcelo Tosatti
2001-06-21  6:56       ` Mike Galbraith
2001-06-21  5:44         ` Marcelo Tosatti
2001-06-21  8:10           ` Mike Galbraith
2001-06-21 13:14           ` Daniel Phillips
2001-06-21 19:50             ` Marcelo Tosatti
2001-06-22  0:32               ` Daniel Phillips
2001-06-22  9:06           ` Mike Galbraith [this message]
2001-06-22  9:57             ` Marcelo Tosatti
2001-06-22 11:50               ` Mike Galbraith
2001-06-22 14:08         ` Linux 2.4.5-ac15 / 2.4.6-pre5 Walter Hofmann
2001-06-22 15:50           ` Mike Galbraith
2001-06-22 17:27             ` Walter Hofmann

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