From: Eric Anholt <eric@anholt.net>
Date: Fri, 20 Mar 2009 01:56:14 +0000 (-0700)
Subject: drm: Use a little stash on the stack to avoid kmalloc in most DRM ioctls.
X-Git-Tag: v2.6.30-rc1~613^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=955a23eb3cfc773e71b05bb7a0a0938a9e1b2568;p=pandora-kernel.git

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>
---

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