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drm/ttm/pool: Try harder for beneficial orders

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When a driver specifies a beneficial order, TTM should make a reasonable
effort to allocate pages at that order.

Use __GFP_RETRY_MAYFAIL instead of __GFP_NORETRY when allocating at the
beneficial order. This allows reclaim to try harder before falling back to
smaller orders, at the cost of longer allocation setup time.

That tradeoff is acceptable for beneficial-order allocations: higher-order
backing pages can improve TLB hit rates and reduce the number of TLB
invalidations needed when moving memory.

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patch.msgid.link/20260617022248.1165101-1-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2026-06-16 19:22:48 -07:00
parent 2bfa2e7f19
commit dd8dde5745
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/ttm/ttm_pool.c
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@ -168,6 +168,11 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
if (order && beneficial_order && order != beneficial_order)
gfp_flags &= ~__GFP_RECLAIM;
if (beneficial_order && order == beneficial_order) {
gfp_flags &= ~__GFP_NORETRY;
gfp_flags |= __GFP_RETRY_MAYFAIL;
}
if (!ttm_pool_uses_dma_alloc(pool)) {
p = alloc_pages_node(pool->nid, gfp_flags, order);
if (p) {