From 4330441a745ea0f1fd881438a0bbdfedda65f74a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Marek=20Ol=C5=A1=C3=A1k?= Date: Sun, 2 Mar 2014 00:56:20 +0100 Subject: [PATCH] drm/radeon: add buffers to the LRU list from smallest to largest MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Marek Olšák Reviewed-by: Christian König --- 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 */ +#include #include #include #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); -- 2.7.4