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

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Date:	Tue, 16 Nov 2010 06:26:34 +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!

> > ...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.

Well, but the biggest image we can write is not 50% of RAM, but 50% of
lowmem... and swap is nearly as big as lowmem in this case -- so this
machine is not misconfigured.

root@amd:/# cat /proc/meminfo 
MemTotal:        2054716 kB
MemFree:          192048 kB
Buffers:           97628 kB
Cached:          1427088 kB
SwapCached:            0 kB
Active:           547580 kB
Inactive:        1091744 kB
Active(anon):      57060 kB
Inactive(anon):    58908 kB
Active(file):     490520 kB
Inactive(file):  1032836 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:       1178440 kB
HighFree:         128092 kB
LowTotal:         876276 kB
LowFree:           63956 kB
SwapTotal:        779148 kB
SwapFree:         779148 kB

> > 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.

OOM? No... image_size of 0 should have written "as small image as
possible"; slow, but should not OOM.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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