From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 14 Oct 2010 11:10:41 +0000 (+0100)
Subject: drm/i915: Avoid vmallocing a buffer for the relocations
X-Git-Tag: v2.6.37-rc1~92^2~11^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2549d6c26ce1c85a76990b972a2c7e8f440455cd;p=pandora-kernel.git

drm/i915: Avoid vmallocing a buffer for the relocations

... perform an access validation check up front instead and copy them in
on-demand, during i915_gem_object_pin_and_relocate(). As around 20% of
the CPU overhead may be spent inside vmalloc for the relocation entries
when submitting an execbuffer [for x11perf -aa10text], the savings are
considerable and result in around a 10% throughput increase [for glyphs].

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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