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drm/i915: Move the recently scanned objects to the tail after shrinking
authorChris Wilson <chris@chris-wilson.co.uk>
Tue, 1 Nov 2016 08:48:43 +0000 (08:48 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Tue, 1 Nov 2016 09:30:09 +0000 (09:30 +0000)
commit535972771d8c99dd53471b54c4dd6a4d22313d84
treefdc8524d2e671aeaad0006bb0ffa4266f102ff09
parent415981623f80a08ae36e9757cd4fa25da140b877
drm/i915: Move the recently scanned objects to the tail after shrinking

During shrinking, we walk over the list of objects searching for
victims. Any that are not removed are put back into the global list.
Currently, they are put back in order (at the front) which means they
will be first to be scanned again. If we instead move them to the rear
of the list, we will scan new potential victims on the next pass and
waste less time rescanning unshrinkable objects. Normally the lists are
kept in rough order to shrinking (with object least frequently used at
the start), by moving just scanned objects to the rear we are
acknowledging that they are still in use.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161101084843.3961-3-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/i915_gem_shrinker.c