Rafael J. Wysocki wrote: > On Saturday 10 October 2009, Thomas Hellstrom wrote: > >> 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()? >> > > There are suspend/hibernation notifiers that can be used for this purpose. > > Thanks, > Rafael > Thanks, Rafael. I tried that and it works fine. Now, it may be that others will hit this problem as well, as the documentation in <linux/pm.h> states that it is safe to make GFP_KERNEL allocations from within a prepare() callback. Such allocations executed in the prepare() preceeding a freeze() will probably make the amount of previously freed memory insufficient. Thanks, Thomas _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
