Re: [PATCH][mm] swsusp: limit image size

[Pavel Machek]

Hi!

> >> What happens if IMAGE_SIZE is bigger than free swap? Do we "try harder"
> >> or do we fail?
> > 
> > First, with swsusp the image can't be bigger than 1/2 of lowmem (1/2 of RAM
> > on x86-64) and the too great values of IMAGE_SIZE have no effect.  Still, if
> > the amount of free swap is smaller than 1/2 of RAM and the image happens
> > to be bigger, we will fail.
> 
> ok. This is not nice since we might fail without any _real_ need. Can we
> make this parameter userspace-tweakable, so that my userspace app can do
> something like (pseudocode):
> 
>     echo 500 > /sys/power/swsusp/imagesize
>     echo disk > /sys/power/state
>     R=$?
>     if [ $R -eq $ENOMEM ]; then
>         echo 100 > /sys/power/swsusp/imagesize # try again

You can do 'echo 0' -- as small as possible.

>         echo disk > /sys/power/state
>         R=$?
>     fi
>     if [ $R -ne 0 ]; then
>         pop_up_some_loud_beeping_window "suspend failed!"
>     fi
> 
> This would at least give us a chance for a second try. I know that Pavel
> dislikes userspace tunables, but i dislike failing suspends ;-)

Can we do that when we start seeing failed suspends? I think it will
not happen. If we have reasonably-sized swap partition, it should be
ok.

							Pavel
-- 
Thanks, Sharp!
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