Hi, Amaranath, On Tue, 2024-04-02 at 17:25 +0530, Somalapuram, Amaranath wrote: > > On 3/29/2024 8:26 PM, Thomas Hellström wrote: > > 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 > On the latest drm-misc good amount of conflicts on both patch series, > able to re-base first one, Second on has 16 patches. > If you have latest re-base patches, Please share it. I was a bit unclear here. This series includes a rebased variant of the first series, and the rest of this series is a rework of the remaining patches in the second series below. So this series is self-contained and the links are provided only for reference and context. This series still seems to apply using git am -3 on drm-tip, and with a minor single conflict on drm-misc-next. (Typically we send the patches against drm-tip since that's what CI is using). The below series has not been rebased but I have a version of this series with a direct-swap-cache insertion backend lying around somewhere. I can post it or share it on gitlab if you want. Thanks, /Thomas > > Regards, > S.Amarnath > > 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 > >
