From 610b399f1ff269e4b9ec85cfdffb06f9befd0c41 Mon Sep 17 00:00:00 2001 From: Bas Nieuwenhuizen Date: Wed, 25 Jul 2018 22:29:50 +0200 Subject: [PATCH] drm/ttm: Merge hugepage attr changes in ttm_dma_page_put. (v2) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Every set_pages_array_wb call resulted in cross-core interrupts and TLB flushes. Merge more of them for less overhead. This reduces the time needed to free a 1.6 GiB GTT WC buffer as part of Vulkan CTS from ~2 sec to < 0.25 sec. (Allocation still takes more than 2 sec though) (v2): use set_pages_wb instead of set_memory_wb. Signed-off-by: Bas Nieuwenhuizen Signed-off-by: Huang Rui Reviewed-by: Christian König Reviewed-by: Huang Rui Signed-off-by: Alex Deucher --- drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c index f31148ad981c..8304917294a2 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c @@ -349,17 +349,14 @@ static void ttm_pool_update_free_locked(struct dma_pool *pool, static void ttm_dma_page_put(struct dma_pool *pool, struct dma_page *d_page) { struct page *page = d_page->p; - unsigned i, num_pages; + unsigned num_pages; /* Don't set WB on WB page pool. */ if (!(pool->type & IS_CACHED)) { num_pages = pool->size / PAGE_SIZE; - for (i = 0; i < num_pages; ++i, ++page) { - if (ttm_set_pages_array_wb(&page, 1)) { - pr_err("%s: Failed to set %d pages to wb!\n", - pool->dev_name, 1); - } - } + if (ttm_set_pages_wb(page, num_pages)) + pr_err("%s: Failed to set %d pages to wb!\n", + pool->dev_name, num_pages); } list_del(&d_page->page_list);