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* [PATCH] drm/xe: Use DRM_BUDDY_CONTIGUOUS_ALLOCATION for contiguous allocations
@ 2025-12-05  3:11 Sanjay Yadav
  2025-12-05  3:20 ` ✓ CI.KUnit: success for " Patchwork
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Sanjay Yadav @ 2025-12-05  3:11 UTC (permalink / raw)
  To: intel-xe; +Cc: matthew.auld

The VRAM/stolen memory managers do not currently set
DRM_BUDDY_CONTIGUOUS_ALLOCATION for contiguous allocations. Enabling
this flag activates the buddy allocator's try_harder path, which helps
handle fragmented memory scenarios.

This enables the __alloc_contig_try_harder fallback in the buddy
allocator, allowing contiguous allocation requests to succeed even when
memory is fragmented by combining allocations from both(RHS and LHS)
sides of a large free block.

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6713
Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
---
 drivers/gpu/drm/xe/xe_ttm_vram_mgr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
index 9f70802fce92..ef6cfb8af0ac 100644
--- a/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
+++ b/drivers/gpu/drm/xe/xe_ttm_vram_mgr.c
@@ -82,6 +82,9 @@ static int xe_ttm_vram_mgr_new(struct ttm_resource_manager *man,
 	if (place->flags & TTM_PL_FLAG_TOPDOWN)
 		vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
 
+	if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
+		vres->flags |= DRM_BUDDY_CONTIGUOUS_ALLOCATION;
+
 	if (place->fpfn || lpfn != man->size >> PAGE_SHIFT)
 		vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
 
-- 
2.52.0


^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-12-09  4:38 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2025-12-05  3:11 [PATCH] drm/xe: Use DRM_BUDDY_CONTIGUOUS_ALLOCATION for contiguous allocations Sanjay Yadav
2025-12-05  3:20 ` ✓ CI.KUnit: success for " Patchwork
2025-12-05  4:21 ` ✓ Xe.CI.BAT: " Patchwork
2025-12-05  5:08 ` ✓ Xe.CI.Full: " Patchwork
2025-12-05 16:19 ` [PATCH] " Matthew Brost
2025-12-09  4:37   ` Yadav, Sanjay Kumar

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