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

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Date:	Wed, 18 Apr 2007 18:56:52 -0400
From:	"Bob Picco" <bob.picco@...com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christian Hesse <mail@...thworm.de>, 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

Ingo Molnar wrote:	[Wed Apr 18 2007, 06:02:28PM EDT]
> 
> * Christian Hesse <mail@...thworm.de> wrote:
> 
> > > 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.
> 
> what's the easiest way for me to try suspend2? Apply the patch, reboot 
> into the kernel, then execute what command to suspend? (there's a 
> confusing mismash of initiators of all the suspend variants. Can i drive 
> this by echoing to /sys/power/state?)
> 
> 	Ingo
I had hoped to collect more data with CFS V2. It crashes in
scale_nice_down for s2ram when attempting to disable_nonboot_cpus. 
So part of traceback looks like (typed by hand with obvious omissions):

scale_nice_down
update_stats_wait_end - not shown in traceback because inlined
pick_next_task_fair
migration_call
task_rq_lock
notifier_call_chain
_cpu_down
disable_nonboot_cpus
...

This is standard -rc7 with V2 CFS applied. It could be a completely
unrelated issue. I'll attempt to debug further tomorrow.

bob
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