Re: [RFC/RFT] swsusp: image size tunable (was: Re: [PATCH][mm] swsusp: limit image size)

[Christian Trefzer <ctrefzer@gmx.de>]

On Fri, Dec 16, 2005 at 11:16:23AM +0100, Stefan Seyfried wrote:
> This is almost trivially solvable from userspace (not tested, beware :-):
> - check the return code of your write() to /sys/power/state
> - if it is ENOMEM (better look into the kernel code if this is what is
>   actually reported...), then write "0" to image_size and try again.
> 
> or (not as sophisticated, and i am not sure if the paths are all correct):
> ----
> #!/bin/sh
> echo 150  > /sys/power/image_size
> echo disk > /sys/power/state
> if [ $? -ne 0 ]; then
>     echo 0 > /sys/power/image_size
>     echo disk > /sys/power/state
> fi
> ----
> this will retry on any error (e.g. process not stopped, no swap space
> at all, device refused to suspend...) not only on ENOMEM, but echo
> unfortunately does not return the error code, only success or failure.
> Easy solution would be a small perl or C program.
> 
> I am not convinced that this should be handled in the kernel.

I do not see a horrific logical problem here, given that the maximum
desired image size is the minimum of max_image_size and free swap space
available. The main question is the one of implementation, though.

Yours,
Chris

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