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drm/ttm: roundup the shrink request to prevent skip huge pool 

e.g. shrink reqeust is less than 512, the logic will skip huge pool

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Roger He 2017-11-21 16:47:16 +08:00 committed by Alex Deucher
parent bae5c5b50b
commit 2bf257d662
1 changed files with 7 additions and 5 deletions
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12
drivers/gpu/drm/ttm/ttm_page_alloc.c
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@ -442,17 +442,19 @@ ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
/* select start pool in round robin fashion */
for (i = 0; i < NUM_POOLS; ++i) {
unsigned nr_free = shrink_pages;
unsigned page_nr;
if (shrink_pages == 0)
break;
pool = &_manager->pools[(i + pool_offset)%NUM_POOLS];
page_nr = (1 << pool->order);
/* OK to use static buffer since global mutex is held. */
nr_free_pool = (nr_free >> pool->order);
if (nr_free_pool == 0)
continue;
nr_free_pool = roundup(nr_free, page_nr) >> pool->order;
shrink_pages = ttm_page_pool_free(pool, nr_free_pool, true);
freed += ((nr_free_pool - shrink_pages) << pool->order);
freed += (nr_free_pool - shrink_pages) << pool->order;
if (freed >= sc->nr_to_scan)
break;
}
mutex_unlock(&lock);
return freed;