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 at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_evict.c | 4 +---
1 files changed, 1 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index b61f4f0f..354b584 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -39,7 +39,6 @@ mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
return false;
list_add(&obj->exec_list, unwind);
- drm_gem_object_reference(&obj->base);
return drm_mm_scan_add_block(obj->gtt_space);
}
@@ -144,7 +143,6 @@ none:
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.
@@ -163,10 +161,10 @@ 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 */
--
1.7.9.1
