linux-kernel - Re: CFS and suspend2: hang in atomic copy

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Message-ID: <20070418211632.GA7610@elte.hu>
Date:	Wed, 18 Apr 2007 23:16:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christian Hesse <mail@...thworm.de>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	suspend2-devel@...ts.suspend2.net
Subject: Re: CFS and suspend2: hang in atomic copy


* Christian Hesse <mail@...thworm.de> wrote:

> > i took a quick look at suspend2 and it makes some use of yield(). 
> > There's a bug in CFS's yield code, i've attached a patch that should 
> > fix it, does it make any difference to the hang?
> 
> This patch should apply cleanly against what? The second hunk is 
> ignored as it has already been applied. Is this correct?

hm, i think you might have had one of the earlier CFS patches.

> But no, it does not change anything. Let me know if you have any other 
> patches to test.

could you try the -v3 patch i released a few hours ago:

   http://redhat.com/~mingo/cfs-scheduler/

although probably your suspend2 problem is still not fixed, it's worth a 
try nevertheless. Which suspend2 patch did you apply, and was it against 
-rc6 or -rc7?

	Ingo
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