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

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Message-Id: <201102222209.15647.rjw@sisk.pl>
Date:	Tue, 22 Feb 2011 22:09:15 +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:
> 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?

Rafael
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