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

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Message-Id: <201011152326.44357.rjw@sisk.pl>
Date:	Mon, 15 Nov 2010 23:26:44 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
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

On Sunday, November 14, 2010, Pavel Machek wrote:
> Hi!

Hi,

> ...but there's enough -- or at least it was enough to fit previous
> versions. 32-bit machine, so it has highmem.
> 
> System is in console mode, very lightly loaded.
> 
> Mem:   2054716k total,   736548k used,  1318168k free,    15368k buffers
> Swap:   779148k total,     2360k used,   776788k free,   546388k cached

Well, the swap is rather in short supply.  Below the 50% of RAM recommendation.

> thinkpad_acpi: ACPI backlight control delay disabled
> PM: thaw of devices complete after 539.577 msecs
> PM: writing image.
> PM: Free swap pages: 194166
> PM: Not enough free swap
> Restarting tasks ...
> 
> Aha, and it is the new default /sys/power/image_size .. setting it to
> 0 lets machine hibernate. I guess the new default is very wrong for
> highmem machine...

The old default did the wrong thing for everyone with sufficient swap (it made
the OOM code trigger every time while preparing to create an image), so I think
the new one it's better overall.

Thanks,
Rafael
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