From: Marek Olšák <marek.olsak@xxxxxxx>
Signed-off-by: Marek Olšák <marek.olsak@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_cs.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index f28a8d8..d49a3f7 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -24,6 +24,7 @@
* Authors:
* Jerome Glisse <glisse@xxxxxxxxxxxxxxx>
*/
+#include <linux/list_sort.h>
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include "radeon_reg.h"
@@ -290,6 +291,16 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
return 0;
}
+static int cmp_size_smaller_first(void *priv, struct list_head *a,
+ struct list_head *b)
+{
+ struct radeon_bo_list *la = list_entry(a, struct radeon_bo_list, tv.head);
+ struct radeon_bo_list *lb = list_entry(b, struct radeon_bo_list, tv.head);
+
+ /* Sort A before B if A is smaller. */
+ return (int)la->bo->tbo.num_pages - (int)lb->bo->tbo.num_pages;
+}
+
/**
* cs_parser_fini() - clean parser states
* @parser: parser structure holding parsing context.
@@ -303,6 +314,18 @@ static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error, bo
unsigned i;
if (!error) {
+ /* Sort the buffer list from the smallest to largest buffer,
+ * which affects the order of buffers in the LRU list.
+ * This assures that the smallest buffers are added first
+ * to the LRU list, so they are likely to be later evicted
+ * first, instead of large buffers whose eviction is more
+ * expensive.
+ *
+ * This slightly lowers the number of bytes moved by TTM
+ * per frame under memory pressure.
+ */
+ list_sort(NULL, &parser->validated, cmp_size_smaller_first);
+
ttm_eu_fence_buffer_objects(&parser->ticket,
&parser->validated,
parser->ib.fence);
--
1.8.3.2
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