Mesa (master): winsys/amdgpu: expand the slab allocation range to [256 B, 1 MB]

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Module: Mesa
Branch: master
Commit: 586f1397133f2d918fc440c6bfce858d73f5cb80
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=586f1397133f2d918fc440c6bfce858d73f5cb80

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sun Jan 24 01:14:54 2021 -0500

winsys/amdgpu: expand the slab allocation range to [256 B, 1 MB]

This increases the wasted memory to 140 MB for DeusExMD, still below
the original number. The advantage is that we now get 2 MB pages for more
buffers and fewer total buffers allocated by the kernel, enabling faster
GPU page translation and slightly lower kernel overhead.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8683>

---

 src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c b/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
index 693414abd40..15cbafe69ff 100644
--- a/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
+++ b/src/gallium/winsys/amdgpu/drm/amdgpu_winsys.c
@@ -445,8 +445,8 @@ amdgpu_winsys_create(int fd, const struct pipe_screen_config *config,
                     (aws->info.vram_size + aws->info.gart_size) / 8,
                     amdgpu_bo_destroy, amdgpu_bo_can_reclaim);
 
-      unsigned min_slab_order = 9;  /* 512 bytes */
-      unsigned max_slab_order = 18; /* 256 KB - higher numbers increase memory usage */
+      unsigned min_slab_order = 8;  /* 256 bytes */
+      unsigned max_slab_order = 20; /* 1 MB (slab size = 2 MB) */
       unsigned num_slab_orders_per_allocator = (max_slab_order - min_slab_order) /
                                                NUM_SLAB_ALLOCATORS;