Hi! > > From: Rafael J. Wysocki <rjw@xxxxxxx> > > > > Martin reports that on his system hibernation occasionally fails due > > to the lack of memory, because the radeon driver apparently allocates > > too much of it during the device freeze stage. It turns out that the > > amount of memory allocated by radeon during hibernation (and > > presumably during system suspend too) depends on the utilization of > > the GPU (e.g. hibernating while there are two KDE 4 sessions with > > compositing enabled causes radeon to allocate more memory than for > > one KDE 4 session). > > > > In principle it should be possible to use image_size to make the > > memory preallocation mechanism free enough memory for the radeon > > driver, but in practice it is not easy to guess the right value > > because of the way the preallocation code uses image_size. For this > > reason, it seems reasonable to allow users to control the amount of > > memory reserved for driver allocations made after the preallocation, > > which currently is constant and amounts to 1 MB. > > > > Introduce a new sysfs file, /sys/power/reserved_size, whose value > > will be used as the amount of memory to reserve for the > > post-preallocation reservations made by device drivers, in bytes. > > For backwards compatibility, set its default (and initial) value to > > the currently used number (1 MB). > > > > References: https://bugzilla.kernel.org/show_bug.cgi?id=34102 > > Reported-by: Martin Steigerwald <Martin@xxxxxxxxxxxx> > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > > OK, there are no comments, so my understanding is that everyone is fine > with this patch and I can add it to my linux-next branch. Actually no, I don't like it. Yes, knob might be useful for debugging, but having it as part of official kernel interface... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
