linux-kernel - RE: [PATCH] mm: fix page_mkclean

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Message-ID: <000101c72a46$ee2296b0$bc84030a@amr.corp.intel.com>
Date:	Wed, 27 Dec 2006 22:10:52 -0800
From:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
To:	"'Linus Torvalds'" <torvalds@...l.org>,
	"David Miller" <davem@...emloft.net>
Cc:	<ranma@...edrich.de>, <gordonfarquharson@...il.com>,
	<tbm@...ius.com>, "Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	<andrei.popa@...eo.ro>, "Andrew Morton" <akpm@...l.org>,
	<hugh@...itas.com>, <nickpiggin@...oo.com.au>,
	<arjan@...radead.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mm: fix page_mkclean_one

Chen, Kenneth wrote on Wednesday, December 27, 2006 9:55 PM
> Linus Torvalds wrote on Wednesday, December 27, 2006 7:05 PM
> > On Wed, 27 Dec 2006, David Miller wrote:
> > > > 
> > > > I still don't see _why_, though. But maybe smarter people than me can see 
> > > > it..
> > > 
> > > FWIW this program definitely triggers the bug for me.
> > 
> > Ok, now that I have something simple to do repeatable stuff with, I can 
> > say what the pattern is.. It's not all that surprising, but it's still 
> > worth just stating for the record.
> 
> 
> Running the test code, git bisect points its finger at this commit. Reverting
> this commit on top of 2.6.20-rc2 doesn't trigger the bug from the test code.
> 
> edc79b2a46ed854595e40edcf3f8b37f9f14aa3f is first bad commit
> commit edc79b2a46ed854595e40edcf3f8b37f9f14aa3f
> Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date:   Mon Sep 25 23:30:58 2006 -0700
> 
>     [PATCH] mm: balance dirty pages
> 
>     Now that we can detect writers of shared mappings, throttle them.  Avoids OOM
>     by surprise.


Oh, never mind :-(  I just didn't create enough write out pressure when
test this. I just saw bug got triggered on a kernel I previously thought
was OK.
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