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

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Date:	Wed, 18 Apr 2007 23:57:21 +0200
From:	Christian Hesse <mail@...thworm.de>
To:	Ingo Molnar <mingo@...e.hu>
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

On Wednesday 18 April 2007, Ingo Molnar wrote:
> * 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.

You are right.

> > 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?

You are right again. ;-)

Linux 2.6.21-rc7
Suspend2 2.2.9.11 (applies cleanly to -rc7)
CFS v3 (without any additional patches)

And it still hangs on suspend.
-- 
Regards,
Chris

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