Am 12.06.19 um 17:13 schrieb Yang, Philip:
TTM create two zones, kernel zone and dma32 zone for system memory. If
system memory address allocated is below 4GB, this account to dma32 zone
and will exhaust dma32 zone and trigger unnesssary TTM eviction.
Patch "drm/ttm: Account for kernel allocations in kernel zone only" only
handle the allocation for acc_size, the system memory page allocation is
through ttm_mem_global_alloc_page which still account to dma32 zone if
page is below 4GB.
NAK, as the name says the mem_glob is global for all devices in the system.
So this will break if you mix DMA32 and non DMA32 in the same system
which is exactly the configuration my laptop here has :(
Christian.
Change-Id: I289b85d891b8f64a1422c42b1eab398098ab7ef7
Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 2778ff63d97d..79bb9dfe617b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1686,6 +1686,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
}
adev->mman.initialized = true;
+ /* Only kernel zone (no dma32 zone) if device does not require dma32 */
+ if (!adev->need_dma32)
+ adev->mman.bdev.glob->mem_glob->num_zones = 1;
+
/* We opt to avoid OOM on system pages allocations */
adev->mman.bdev.no_retry = true;
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