linux-kernel - Re: does hibernate to disk try hard enough to free memory?

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Message-Id: <201102222332.43864.rjw@sisk.pl>
Date:	Tue, 22 Feb 2011 23:32:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Martin Steigerwald <Martin@...htvoll.de>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: does hibernate to disk try hard enough to free memory?

On Tuesday, February 22, 2011, Martin Steigerwald wrote:
> Am Tuesday 22 February 2011 schrieb Rafael J. Wysocki:
> > On Tuesday, February 22, 2011, Martin Steigerwald wrote:
> > > Hi!
> > > 
> > > Since Radeon KMS I often have it that my ThinkPad T42 with 2 MiB of
> > > RAM is not able to allocate memory for the hibernation image. Before
> > > KMS hibernation only very rarely failed for that reason.
> > > 
> > > Often I run without compositing at all as I believe this might spare
> > > some pages as well. But this doesn't always help.
> > > 
> > > It complains that to less pages could be freed. For example with
> > > kernel 2.6.37:
> > > 
> > > Feb 16 00:15:00 shambhala kernel: PM: Creating hibernation image:
> > > Feb 16 00:15:00 shambhala kernel: PM: Need to copy 186577 pages
> > > Feb 16 00:15:00 shambhala kernel: PM: Normal pages needed: 114411 +
> > > 1024, available pages: 112767
> > > Feb 16 00:15:00 shambhala kernel: PM: Not enough free memory
> > > Feb 16 00:15:00 shambhala kernel: PM: Error -12 creating hibernation
> > > image Feb 16 00:15:00 shambhala kernel: Extended CMOS year: 2000
> > > Feb 16 00:15:00 shambhala kernel: ACPI: Waking up from system sleep
> > > state S4
> > > Feb 16 00:15:00 shambhala kernel: PM: early recover of devices
> > > complete after 0.376 msecs
> > 
> > What's the value in /sys/power/image_size?
> 
> shambhala:~> cat /sys/power/image_size
> 844206080
>
> Should I try with less?

Yes, please.  Try with 700000000 for example.

Thanks,
Rafael
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