linux-kernel - Re: [PATCH 1/3] PM: Disable OOM killer during system-wide power transitions

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Message-ID: <20090503094718.GB10278@elf.ucw.cz>
Date:	Sun, 3 May 2009 11:47:18 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 1/3] PM: Disable OOM killer during system-wide power
	transitions


> > Does the same apply to suspending?  If so, why?
> 
> Because I think it doesn't work anyway.  User space processes are frozen and
> effectively in TASK_UNINTERRUPTIBLE, so they won't be killed.
> 
> > I think this is an OK change, as long as the only thing which is
> > allocating memory is hibernation itself.  If random processes are still
> > doing random memory allocations at this time then their failed memory
> > allocation could be just as fatal as an oom-killing.  Moreso if they're
> > s/bin/init or whatever.
> 
> At this point all of the user space tasks are frozen.

Well, many kernel threads still remain active. But it is true that OOM
killer is unlikely to help.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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