From: Chris Wilson Date: Fri, 24 Feb 2012 00:27:21 +0000 (+0000) Subject: drm/i915: Only bump refcnt on objects scheduled for eviction X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b67082425350a0a47cde7ebfb7914a72c4c97d0f;p=linux-beck.git 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 Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c index 097119caa36a..6ba4be52936b 100644 --- a/drivers/gpu/drm/i915/i915_gem_evict.c +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -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 */