This series implements TTM shrinker / eviction helpers and an xe bo shrinker. It builds on two previous series. First https://www.mail-archive.com/dri-devel@xxxxxxxxxxxxxxxxxxxxx/msg484425.html for patch 1-4, which IMO still could be reviewed and pushed as a separate series. Second the previous TTM shrinker series https://lore.kernel.org/linux-mm/b7491378-defd-4f1c-31e2-29e4c77e2d67@xxxxxxx/T/ Where the comment about layering https://lore.kernel.org/linux-mm/b7491378-defd-4f1c-31e2-29e4c77e2d67@xxxxxxx/T/#ma918844aa8a6efe8768fdcda0c6590d5c93850c9 now addressed, and this version also implements shmem objects for backup rather than direct swap-cache insertions, which was used in the previuos series. It turns out that with per-page backup / shrinking, shmem objects appears to work just as well as direct swap-cache insertions with the added benefit that was introduced in the previous TTM shrinker series to avoid running out of swap entries isn't really needed. In any case, patch 1-4 are better described in their separate series. (RFC is removed for those). Patch 5 could in theory be skipped but introduces a possibility to easily add or test multiple backup backends, like the direct swap-cache insertion or even files into fast dedicated nvme storage for for example. Patch 6 introduces helpers in the ttm_pool code for page-by-page shrinking and recovery. It avoids having to temporarily allocate a huge amount of memory to be able to shrink a buffer object. It also introduces the possibility to immediately write-back pages if needed, since that tends to be a bit delayed when left to kswapd. Patch 7 introduces a LRU walk helper for eviction and shrinking. It's currently xe-only but not xe-specific and can easily be moved to TTM when used by more than one driver or when eviction is implemented using it. Patch 8 introduces a helper callback for shrinking (Also ready to be moved to TTM) and an xe-specific shrinker implementation. Testing: ATM I don't think we have good tests to cover the shrinking functionality The series has been tested with a hack that continously creates TTM_TT buffer objects until system memory and swap space is exhausted, and then reads them back and frees them. However, these tests seem to be very slow. Ideally a similar test on a machine with very fast solid state or similar storage should be set up. Ideally also verifying content preservation. Cc: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx> Cc: Christian König <christian.koenig@xxxxxxx> Cc: <dri-devel@xxxxxxxxxxxxxxxxxxxxx> Thomas Hellström (8): drm/ttm: Allow TTM LRU list nodes of different types drm/ttm: Use LRU hitches drm/ttm, drm/amdgpu, drm/xe: Consider hitch moves within bulk sublist moves drm/ttm: Allow continued swapout after -ENOSPC falure drm/ttm: Add a virtual base class for graphics memory backup drm/ttm/pool: Provide a helper to shrink pages. drm/xe, drm/ttm: Provide a generic LRU walker helper drm/xe: Add a shrinker for xe bos drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 4 + drivers/gpu/drm/ttm/Makefile | 2 +- drivers/gpu/drm/ttm/ttm_backup_shmem.c | 137 +++++++++ drivers/gpu/drm/ttm/ttm_bo.c | 1 + drivers/gpu/drm/ttm/ttm_device.c | 33 ++- drivers/gpu/drm/ttm/ttm_pool.c | 391 ++++++++++++++++++++++++- drivers/gpu/drm/ttm/ttm_resource.c | 231 ++++++++++++--- drivers/gpu/drm/ttm/ttm_tt.c | 34 +++ drivers/gpu/drm/xe/Makefile | 2 + drivers/gpu/drm/xe/xe_bo.c | 123 ++++++-- drivers/gpu/drm/xe/xe_bo.h | 3 + drivers/gpu/drm/xe/xe_device.c | 8 + drivers/gpu/drm/xe/xe_device_types.h | 2 + drivers/gpu/drm/xe/xe_shrinker.c | 237 +++++++++++++++ drivers/gpu/drm/xe/xe_shrinker.h | 18 ++ drivers/gpu/drm/xe/xe_ttm_helpers.c | 224 ++++++++++++++ drivers/gpu/drm/xe/xe_ttm_helpers.h | 63 ++++ drivers/gpu/drm/xe/xe_vm.c | 4 + include/drm/ttm/ttm_backup.h | 136 +++++++++ include/drm/ttm/ttm_device.h | 2 + include/drm/ttm/ttm_pool.h | 4 + include/drm/ttm/ttm_resource.h | 96 +++++- include/drm/ttm/ttm_tt.h | 19 ++ 23 files changed, 1683 insertions(+), 91 deletions(-) create mode 100644 drivers/gpu/drm/ttm/ttm_backup_shmem.c create mode 100644 drivers/gpu/drm/xe/xe_shrinker.c create mode 100644 drivers/gpu/drm/xe/xe_shrinker.h create mode 100644 drivers/gpu/drm/xe/xe_ttm_helpers.c create mode 100644 drivers/gpu/drm/xe/xe_ttm_helpers.h create mode 100644 include/drm/ttm/ttm_backup.h -- 2.44.0
