linux-kernel - Re: 2.6.37-rc1+: hibernate regression, claims not enough swap space

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Message-ID: <20101117233859.GA23086@elf.ucw.cz>
Date:	Thu, 18 Nov 2010 00:38:59 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: 2.6.37-rc1+: hibernate regression, claims not enough swap space

Hi!

> > > This is not how it works now.  We preallocate memory to create memory pressure,
> > > so if image_size is 0, we need to preallocate until we run out of pages that
> > > can be freed, which means OOM.
> > 
> > That's bad, right? Instead of killing 
> 
> I'm not sure what you mean.

I meant "instead of failing hibernation, you get OOM -- killing random
processes".

> > Anyway, it does not work at all.
> > 
> > root@amd:~# echo 300000000 > /sys/power/image_size
> > root@amd:~# echo disk > /sys/power/state 
> > -su: echo: write error: No space left on device
> > 
> > (And dmesg full of failed allocations).
> > 
> > I can write 400M there, and it fails, too.
> 
> Well, in that case your swap is smaller than the requested image size, isn't it?

No, swap is 

pavel@amd:~/misc$ cat /proc/swaps 
Filename				Type		Size	Used
Priority
/dev/sda1                               partition	779148	0
-1

... 700M.

> There's a check in there that should catch that and it apparently doesn't work.
> 
> Do you have that dmesg by chance?

dmesg is useless -- it is full of backtraces :-(. ACPI allocations
fail.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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