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

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Marek Olšák 2014-03-02 00:56:20 +01:00 committed by Christian König
parent 0bc490a8d9
commit 4330441a74
1 changed files with 23 additions and 0 deletions
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23
drivers/gpu/drm/radeon/radeon_cs.c
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@ -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);