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drm/ttm: stop pooling cached NUMA pages v2 

commit b6976f323a upstream.

We only pool write combined and uncached allocations because they
require extra overhead on allocation and release.

If we also pool cached NUMA it not only means some extra unnecessary
overhead, but also that under memory pressure it can happen that
pages from the wrong NUMA node enters the pool and are re-used
over and over again.

This can lead to performance reduction after running into memory
pressure.

v2: restructure and cleanup the code a bit from the internal hack to
    test this.

Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: 4482d3c94d ("drm/ttm: add NUMA node id to the pool")
CC: stable@vger.kernel.org
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240415134821.1919-1-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian König 2024-04-15 15:48:21 +02:00 committed by Greg Kroah-Hartman
parent 2246736ab9
commit d77bfc8dc7
1 changed files with 28 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/gpu/drm/ttm/ttm_pool.c
View File

@ -288,17 +288,23 @@ static struct ttm_pool_type *ttm_pool_select_type(struct ttm_pool *pool,
enum ttm_caching caching,
unsigned int order)
{
if (pool->use_dma_alloc || pool->nid != NUMA_NO_NODE)
if (pool->use_dma_alloc)
return &pool->caching[caching].orders[order];
#ifdef CONFIG_X86
switch (caching) {
case ttm_write_combined:
if (pool->nid != NUMA_NO_NODE)
return &pool->caching[caching].orders[order];
if (pool->use_dma32)
return &global_dma32_write_combined[order];
return &global_write_combined[order];
case ttm_uncached:
if (pool->nid != NUMA_NO_NODE)
return &pool->caching[caching].orders[order];
if (pool->use_dma32)
return &global_dma32_uncached[order];
@ -566,11 +572,17 @@ void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
pool->use_dma_alloc = use_dma_alloc;
pool->use_dma32 = use_dma32;
if (use_dma_alloc || nid != NUMA_NO_NODE) {
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
for (j = 0; j < NR_PAGE_ORDERS; ++j)
ttm_pool_type_init(&pool->caching[i].orders[j],
pool, i, j);
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
for (j = 0; j < NR_PAGE_ORDERS; ++j) {
struct ttm_pool_type *pt;
/* Initialize only pool types which are actually used */
pt = ttm_pool_select_type(pool, i, j);
if (pt != &pool->caching[i].orders[j])
continue;
ttm_pool_type_init(pt, pool, i, j);
}
}
}
EXPORT_SYMBOL(ttm_pool_init);
@ -599,10 +611,16 @@ void ttm_pool_fini(struct ttm_pool *pool)
{
unsigned int i, j;
if (pool->use_dma_alloc || pool->nid != NUMA_NO_NODE) {
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i)
for (j = 0; j < NR_PAGE_ORDERS; ++j)
ttm_pool_type_fini(&pool->caching[i].orders[j]);
for (i = 0; i < TTM_NUM_CACHING_TYPES; ++i) {
for (j = 0; j < NR_PAGE_ORDERS; ++j) {
struct ttm_pool_type *pt;
pt = ttm_pool_select_type(pool, i, j);
if (pt != &pool->caching[i].orders[j])
continue;
ttm_pool_type_fini(pt);
}
}
/* We removed the pool types from the LRU, but we need to also make sure