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drm/i915: Only bump refcnt on objects scheduled for eviction 

Incrementing the reference count on all objects walked when searching
for space in the aperture is a non-neglible amount of overhead. In fact,
we only need to hold on to a reference for objects that we will evict,
so we can therefore delay the referencing until we find a suitable hole
and only add those objects that fall inside.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-02-24 00:27:21 +00:00 committed by Daniel Vetter
parent bd45545f74
commit b670824253
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/i915/i915_gem_evict.c
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@ -36,7 +36,6 @@ static bool
mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
{
list_add(&obj->exec_list, unwind);
drm_gem_object_reference(&obj->base);
return drm_mm_scan_add_block(obj->gtt_space);
}
@ -139,7 +138,6 @@ i915_gem_evict_something(struct drm_device *dev, int min_size,
BUG_ON(ret);
list_del_init(&obj->exec_list);
drm_gem_object_unreference(&obj->base);
}
/* We expect the caller to unpin, evict all and try again, or give up.
@ -158,10 +156,10 @@ found:
exec_list);
if (drm_mm_scan_remove_block(obj->gtt_space)) {
list_move(&obj->exec_list, &eviction_list);
drm_gem_object_reference(&obj->base);
continue;
}
list_del_init(&obj->exec_list);
drm_gem_object_unreference(&obj->base);
}
/* Unbinding will emit any required flushes */