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.
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
