6.8-stable review patch. If anyone has any objections, please let me know.
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From: Christian König ckoenig.leichtzumerken@gmail.com
commit b6976f323a8687cc0d55bc92c2086fd934324ed5 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: 4482d3c94d7f ("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-christia... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/ttm/ttm_pool.c | 38 ++++++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 10 deletions(-)
--- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -288,17 +288,23 @@ static struct ttm_pool_type *ttm_pool_se 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 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