[Bug 34102] radeon drm/kms: please use suspend/hibernate notifiers for allocating memory in suspend routines

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=34102





--- Comment #10 from Martin Steigerwald <Martin@Lichtvoll.de>  2011-05-09 15:15:49 ---
This wasn't a hang I think, see there.

I tried to hibernate two running KDE 4 sessions with reserved_size upto 64 MiB:

shambhala:/sys/power> cat reserved_size 
67108864

Which failed with:

May  9 16:41:47 localhost kernel: PM: freeze of devices complete after 524.427
msecs
May  9 16:41:47 localhost kernel: PM: late freeze of devices complete after
0.509 msecs
May  9 16:41:47 localhost kernel: ACPI: Preparing to enter system sleep state
S4
May  9 16:41:47 localhost kernel: PM: Saving platform NVS memory
May  9 16:41:47 localhost kernel: Extended CMOS year: 2000
May  9 16:41:47 localhost kernel: PM: Creating hibernation image:
May  9 16:41:47 localhost kernel: PM: Need to copy 218459 pages
May  9 16:41:47 localhost kernel: PM: Normal pages needed: 113686 + 1024,
available pages: 113492
May  9 16:41:47 localhost kernel: PM: Not enough free memory
May  9 16:41:47 localhost kernel: PM: Error -12 creating hibernation image
May  9 16:41:47 localhost kernel: Extended CMOS year: 2000
May  9 16:41:47 localhost kernel: ACPI: Waking up from system sleep state S4
May  9 16:41:47 localhost kernel: PM: early recover of devices complete after
0.366 msecs

Does it make sense to go to even higher values? I am a bit puzzled, since for
one KDE 4 session a value of 2 MiB has turned out to be enough for about 5-10
attempts - it didn't fail once.

Maybe here there is simply not enough memory available no matter what I reserve
for driver allocation? If so, then so be it. That might be just a limit for a 2
GB RAM machine.

Is there a way to tell for sure whether reserved size is too low or there are
general memory constraints? TuxOnIce logged how much of the reserved extra
pages it used. Can in-kernel-hibernation do this too?

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