PM/Hibernate: Rework memory shrinking

Hi,

The following patchset is an attempt to rework the memory shrinking mechanism
used during hibernation to make room for the image.  It is a work in progress
and most likely it's going to be modified, but it has been discussed recently
and I'd like to get comments on the current version.

[1/5] - disable the OOM kernel after freezing tasks (this will be dropped if
        it's verified that we can avoid the OOM killing by using
        __GFP_FS|__GFP_WAIT|__GFP_NORETRY|__GFP_NOWARN
        in the next patches).

[2/5] - drop memory shrinking from the suspend (to RAM) code path

[3/5] - move swsusp_shrink_memory() to snapshot.c

[4/5] - rework swsusp_shrink_memory() (to use memory allocations for applying
        memory pressure)

[5/5] - allocate image pages along with the shrinking.

Details are in the changelogs, please have a look and tell me what you think.

Best,
Rafael



-- 
Everyone knows that debugging is twice as hard as writing a program
in the first place.  So if you're as clever as you can be when you write it,
how will you ever debug it? --- Brian Kernighan

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