tree 7a9124ddf103ef1f6337484bb5e5ae51c9c288a6
parent af7ae351ad63a137ece86740dbe3f181d09d810f
author Eric Anholt <eric@anholt.net> 1237514174 -0700
committer Dave Airlie <airlied@redhat.com> 1238315497 +1000

drm: Use a little stash on the stack to avoid kmalloc in most DRM ioctls.

The kmalloc was taking up about 1.5% of the CPU on an ioctl-heavy workload
(x11perf -aa10text on 965).  Initial results look like they have a
corresponding improvement in performance for aa10text, but more numbers might
not hurt.

Thanks to ajax for pointing out this performance regression I'd introduced
back in 2007.

[airlied: well I introduced it sneakily inside Eric's patch]

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>