Hibernation out-of-memory problem.

[Thomas H. <the...@vm...>]

Hi!

I'm trying to port a graphics DRM device driver over to the new power 
management hooks in

struct dev_pm_ops.

During the "prepare" call, Video RAM contents may be copied either to 
shmem objects or pages allocated using alloc_page().
Unfortunately, this seems to lead to the hibernation process running out 
of free pages.

One possible cause is that the function swsusp_shrink_memory() is called 
before the prepare() call, and therefore doesn't free up enough memory.

What would be the correct way around this? Should swsusp_shrink_memory() 
be moved to after prepare(), or is it possible to get some kind of 
notification after user space processes is stopped, but before 
swsusp_shrink_memory()?

Thanks
Thomas