[Intel-gfx] [PATCH libdrm 5/5] intel: purge cached bucket when its cached buffer is evicted

[James Xiong]

From: "Xiong, James" <james.xiong at intel.com>

Previously when a cached MRU buffer was found to be evicted by kernel,
the bucket was emptied. The new implementation purged these buffers that
were freed before the evicted one.

Signed-off-by: Xiong, James <james.xiong at intel.com>
---
 intel/intel_bufmgr_gem.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index e3d5a8d..69b361b 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -684,22 +684,20 @@ drm_intel_gem_bo_madvise(drm_intel_bo *bo, int madv)
 		 madv);
 }
 
-/* drop the oldest entries that have been purged by the kernel */
+/* drop the entries that are older than the given time */
 static void
 drm_intel_gem_bo_cache_purge_bucket(drm_intel_bufmgr_gem *bufmgr_gem,
-				    struct drm_intel_gem_bo_bucket *bucket)
+				    struct drm_intel_gem_bo_bucket *bucket,
+				    time_t time)
 {
-	while (!DRMLISTEMPTY(&bucket->head)) {
-		drm_intel_bo_gem *bo_gem;
-
-		bo_gem = DRMLISTENTRY(drm_intel_bo_gem,
-				      bucket->head.next, head);
-		if (drm_intel_gem_bo_madvise_internal
-		    (bufmgr_gem, bo_gem, I915_MADV_DONTNEED))
-			break;
-
-		DRMLISTDEL(&bo_gem->head);
-		drm_intel_gem_bo_free(&bo_gem->bo);
+	drm_intel_bo_gem *bo_gem, *temp;
+	DRMLISTFOREACHENTRYSAFE(bo_gem, temp, &bucket->head, head) {
+		if (bo_gem->free_time >= time) {
+			drm_intel_gem_bo_madvise_internal
+				(bufmgr_gem, bo_gem, I915_MADV_DONTNEED);
+			DRMLISTDEL(&bo_gem->head);
+			drm_intel_gem_bo_free(&bo_gem->bo);
+		}
 	}
 }
 
@@ -753,9 +751,10 @@ retry:
 		if (bo_gem) {
 			if (!drm_intel_gem_bo_madvise_internal
 				(bufmgr_gem, bo_gem, I915_MADV_WILLNEED)) {
-				drm_intel_gem_bo_free(&bo_gem->bo);
 				drm_intel_gem_bo_cache_purge_bucket(bufmgr_gem,
-								    bucket);
+								    bucket,
+								    bo_gem->free_time);
+				drm_intel_gem_bo_free(&bo_gem->bo);
 				return NULL;
 			}
 
-- 
2.7.4