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

Pavel Machek
2010-11-17T23:37:01Z

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.