On Fri, 2026-03-27 at 09:15 +0100, Thomas Hellström wrote: > When writing a "max" limit lower than the current usage, the > existing code silently failed. This series aims to improve > on that by returning -EBUSY on failure and also attempt > to synchronously reclaim device memory to push the usage > under the new max limit to avoid the error. > > Patch 1 implements error propagation. > Patch 2 implements and documents a reclaim callback interface > for the dmem controller. > Patch 3 implements a TTM reclaim callback. > Patch 4-5 hooks up the reclaim callback to the dmem cgroups- > aware drivers xe and amdgpu. > > Thomas Hellström (5): > cgroup/dmem: Return error when setting max below current usage > cgroup/dmem: Add reclaim callback for lowering max below current > usage > drm/ttm: Hook up a cgroup-aware reclaim callback for the dmem > controller > drm/xe: Wire up dmem cgroup reclaim for VRAM manager > drm/amdgpu: Wire up dmem cgroup reclaim for VRAM manager > > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 10 +- > drivers/gpu/drm/ttm/ttm_bo.c | 95 ++++++++++++++++- > drivers/gpu/drm/ttm/ttm_bo_util.c | 3 +- > drivers/gpu/drm/ttm/ttm_resource.c | 36 +++++++ > drivers/gpu/drm/xe/xe_ttm_vram_mgr.c | 19 ++-- > include/drm/ttm/ttm_bo.h | 10 ++ > include/drm/ttm/ttm_resource.h | 4 + > include/linux/cgroup_dmem.h | 11 ++ > kernel/cgroup/dmem.c | 102 ++++++++++++++++- > -- > 10 files changed, 265 insertions(+), 27 deletions(-)
For reference, Series introducing igt test is here: https://patchwork.freedesktop.org/series/163935/ /Thomas
