[Bug 75719] mplayer -vo gl consume more CPU on r200

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75719

--- Comment #8 from Thomas Hellström <thellstrom at vmware.com> ---
There's really nothing in this commit that should affect anything but metadata,
and if anything, CPU usage should've decreased.

So if CPU usage is drastically increased by this commit (or rather this merge),
IMHO that points to a bug somewhere else, but triggered by this merge; possibly
in radeon / TTM caching setup or in the x86 PAT memory region tracking code.

In any case, I'm on out-of-office this week and can't look at this before next
week, but meantime it would be helpful if you could perform a couple of
additional checks:

1) Try to find out which of the commits in the merge that causes this. If that
turns out to be hard, could you change all occurencies of VM_PFNMAP in
ttm_bo_mmap() (ttm_bo_vm.c) to VM_MIXEDMAP and check if that fixes the problem
you are seeing?

2) If you're familiar with oprofile, it would be very helpful to see a profile
of a "good" and a "bad" run, including kernel symbols.

Thanks,

/Thomas

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