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 ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
