Should we even consider not evicting all PDs/PTs, busy or not. See PDs/PTs only use a tiny bit (roughly ~0.05%) of the total memory. You really don't get much memory when you evict them. But I doubt the evict/restore performance penalty is big. Thanks, Oak -----Original Message----- From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Christian König Sent: Friday, March 8, 2019 9:32 AM To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx Subject: [PATCH 3/3] drm/amdgpu: stop evicting busy PDs/PTs Otherwise we won't be able to cleanly handle page faults. Signed-off-by: Christian König <christian.koenig@xxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index cd0ccfbbcb84..c1240bf243ba 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -1371,6 +1371,13 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo, struct dma_fence *f; int i; + /* Don't evict VM page tables while they are busy, otherwise we can't + * cleanly handle page faults. + */ + if (bo->type == ttm_bo_type_kernel && + !reservation_object_test_signaled_rcu(bo->resv, true)) + return false; + /* If bo is a KFD BO, check if the bo belongs to the current process. * If true, then return false as any KFD process needs all its BOs to * be resident to run successfully -- 2.17.1 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
