linux-kernel - Re: [Bug #13058] First hibernation attempt fails

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Date:	Wed, 22 Apr 2009 22:11:17 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	alan-jenkins@...fmail.co.uk, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org
Subject: Re: [Bug #13058] First hibernation attempt fails

On Wednesday 22 April 2009, Pavel Machek wrote:
> Hi!
> 
> > Of course, this will protect the calling task from getting oom-killed. 
> > But it doesn't protect other tasks from getting oom-killed due to the
> > activity of _this_ task.
> > 
> > But I think that problem already exists, and that this proposal doesn't
> > worsen anything, yes?
> > 
> > Or is it the case that all other tasks are safely stuck in the freezer
> > at this time, so they won't be allocating any memory anyway?
> 
> That is the idea, yes. ... but we now have more threads that are not
> freezable... so they may allocate the memory.
> 
> Is it non-feasible to free memory without really going and allocating
> everything?

The question is whether there is a point.  In principle we can just go and
allocate as much as we need upfront.  It shouldn't change anything, because
we resume and suspend devices after creating the image anyway.

I think we could try to disable the OOM killer before suspend and just
allocate the memory for the image right before devices are suspended for the
first time.

Thanks,
Rafael
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