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Commit 4330441a authored by Marek Olšák's avatar Marek Olšák Committed by Christian König
Browse files

drm/radeon: add buffers to the LRU list from smallest to largest 



Signed-off-by: default avatarMarek Olšák <marek.olsak@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
parent 0bc490a8

drivers/gpu/drm/radeon/radeon_cs.c

+23 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
 * Authors:

 *    Jerome Glisse <glisse@freedesktop.org>

 */

#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);