linux-kernel - Re: Bisected: s2disk (uswsusp only) hangs just before poweroff

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Message-ID: <4B164B51.6040203@tuffmail.co.uk>
Date:	Wed, 02 Dec 2009 11:11:13 +0000
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	Mel Gorman <mel@....ul.ie>, "Rafael J. Wysocki" <rjw@...k.pl>
CC:	pm list <linux-pm@...ts.linux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: Bisected: s2disk (uswsusp only) hangs just before poweroff

Mel Gorman wrote:
> On Tue, Dec 01, 2009 at 07:59:40PM +0000, Alan Jenkins wrote:
>   
>> Hi
>>
>> Suspend to disk is (sometimes) hanging for me in 2.6.32-rc.  I finally  
>> got around to bisecting it, which blamed the following commit by Mel:
>>
>> 5f8dcc2 "page-allocator: split per-cpu list into one-list-per-migrate-type"
>>
>> I was able to confirm this by reverting the commit, which fixed the  
>> hang.  I had to revert one other commit first to avoid a conflict:
>>
>> a6f9edd "page-allocator: maintain rolling count of pages to free from  
>> the PCP"
>>
>>     
>
> Which RC kernel? Specifically, are the commits
>
> cc4a6851466039a8a688c843962a05689059ff3b always wake kswapd when restarting an allocation attempt
> 9d0ed60fe9cd1fbf57f755cd27a23ae9114d7210 Do not allow interrupts to use ALLOC_HARDER
>
> applied?
>
> The latter one in particular might make a difference if s2disk is
> pushing the system far below the watermarks. I don't suppose you know
> where it's hanging? i.e. is it hanging in the allocator itself?
>   

After enabling "suspend loglevel = 8" in uswsusp.conf (grr), I saw a 
pair of hung task backtraces.

<http://picasaweb.google.com/Alan.Christopher.Jenkins/Screenshots#5410594126006567282>


> would you mind trying the following patch?
> Unfortunately, it's totally untested. The intention of the patch is to
> use other PCP lists if the desired one cannot be refilled.
>
> Thanks.
>   

Sure, will do.

Thanks
Alan
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