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| author | Sheng Zhao <sheng.zhao@bytedance.com> | 2025-09-25 19:35:16 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2025-10-01 07:24:55 -0400 |
| commit | 3fc3068e7247c94dec08e93fea422a1bb649bfe5 (patch) | |
| tree | 5b237e2cf958f9bfd89317d12342c4d95768a924 /drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | |
| parent | 1c14b0e4ba988381e362ad8a9651eff0b21bd47f (diff) | |
vduse: Use fixed 4KB bounce pages for non-4KB page size
The allocation granularity of bounce pages is PAGE_SIZE. This may cause
even small IO requests to occupy an entire bounce page exclusively. The
kind of memory waste will be more significant when PAGE_SIZE is larger
than 4KB (e.g. arm64 with 64KB pages).
So, optimize it by using fixed 4KB bounce maps and iova allocation
granularity. A single IO request occupies at least a 4KB bounce page
instead of the entire memory page of PAGE_SIZE.
Signed-off-by: Sheng Zhao <sheng.zhao@bytedance.com>
Message-Id: <20250925113516.60305-1-sheng.zhao@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c')
0 files changed, 0 insertions, 0 deletions