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* [PATCH v10 0/7] TTM shrinker helpers and xe buffer object shrinker
@ 2024-09-16 14:51 Thomas Hellström
  2024-09-16 14:51 ` [PATCH v10 1/7] drm/ttm: Balance ttm_resource_cursor_init() and ttm_resource_cursor_fini() Thomas Hellström
                   ` (14 more replies)
  0 siblings, 15 replies; 17+ messages in thread
From: Thomas Hellström @ 2024-09-16 14:51 UTC (permalink / raw)
  To: intel-xe
  Cc: Thomas Hellström, Somalapuram Amaranath,
	Christian König, Matthew Brost, Paulo Zanoni, dri-devel,
	Simona Vetter

This series implements TTM shrinker / eviction helpers and an xe bo
shrinker. It builds on a previous series, *and obsoletes that one*.

https://lore.kernel.org/linux-mm/b7491378-defd-4f1c-31e2-29e4c77e2d67@amd.com/T/

Where the comment about layering
https://lore.kernel.org/linux-mm/b7491378-defd-4f1c-31e2-29e4c77e2d67@amd.com/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.

The series earlier consisted of a LRU traversal part and the current part.
The LRU traversal part is merged, but is still mentioned in the history
below.

Patch 1 balances ttm_resource_cursor_fini() with an init function. It
makes patch 5 more straightforward.

Patch 2 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 3 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 4 Adds a simple error injection to the above code to help increase
test coverage.

Patch 5 Implements a shrinker helper in TTM, and a macro for LRU iteration.

Patch 6 Implements the xe bo shrinker.

Patch 7 Increases (removes) the XE_PL_TT watermark.

v2:
- Squash obsolete revision history in the patch commit messages.
- Fix a couple of review comments by Christian
- Don't store the mem_type in the TTM managers but in the
  resource cursor.
- Rename introduced TTM *back_up* function names to *backup*
- Add ttm pool recovery fault injection.
- Shrinker xe kunit test
- Various bugfixes

v3:
- Address some review comments from Matthew Brost and Christian König.
- Use the restartable LRU walk for TTM swapping and eviction.
- Provide a POC drm_exec locking implementation for exhaustive
  eviction. (Christian König).

v4:
- Remove the RFC exhaustive eviction part. While the path to exhaustive
  eviction is pretty clear and demonstrated in v3, there is still some
  drm_exec work that needs to be agreed and implemented.
- Add shrinker power management. On some hw we need to wake when shrinking.
- Fix the lru walker helper for -EALREADY errors.
- Add drm/xe: Increase the XE_PL_TT watermark.

v5:
- Update also TTM kunit tests
- Handle ghost- and zombie objects in the shrinker.
- A couple of compile- and UAF fixes reported by Kernel Build Robot and
  Dan Carpenter.

v6:
- Address review comments from Matthew Brost on the
  restartable LRU traversal path.

v7:
- Split out TTM restartable LRU traversal path and merge that.
- Adapt the review comments on that series.

v8:
- Address review comments from Matthew Brost as detailed in the
  respective patches.

v9:
- Rebase and fix compilation errors

v10:
- Use a LRU iteration macro rather than a function with a callback.
- Rebasing and cleanups
- Address some additional review comments from Matt Brost.
- Drop the shrinker selftest. It was already merged as a swapout
  self-test.

Cc: Somalapuram Amaranath <Amaranath.Somalapuram@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: <dri-devel@lists.freedesktop.org>

Thomas Hellström (7):
  drm/ttm: Balance ttm_resource_cursor_init() and
    ttm_resource_cursor_fini()
  drm/ttm: Add a virtual base class for graphics memory backup
  drm/ttm/pool: Provide a helper to shrink pages
  drm/ttm: Use fault-injection to test error paths
  drm/ttm: Add a shrinker helper and a macro to perform LRU iteration
  drm/xe: Add a shrinker for xe bos
  drm/xe: Increase the XE_PL_TT watermark

 drivers/gpu/drm/ttm/Makefile           |   2 +-
 drivers/gpu/drm/ttm/ttm_backup_shmem.c | 139 ++++++++
 drivers/gpu/drm/ttm/ttm_bo.c           |   3 +-
 drivers/gpu/drm/ttm/ttm_bo_util.c      | 207 +++++++++++-
 drivers/gpu/drm/ttm/ttm_pool.c         | 419 ++++++++++++++++++++++++-
 drivers/gpu/drm/ttm/ttm_resource.c     |  35 ++-
 drivers/gpu/drm/ttm/ttm_tt.c           |  37 +++
 drivers/gpu/drm/xe/Makefile            |   1 +
 drivers/gpu/drm/xe/tests/xe_bo.c       |   6 +-
 drivers/gpu/drm/xe/xe_bo.c             | 195 +++++++++++-
 drivers/gpu/drm/xe/xe_bo.h             |  36 +++
 drivers/gpu/drm/xe/xe_device.c         |   8 +
 drivers/gpu/drm/xe/xe_device_types.h   |   2 +
 drivers/gpu/drm/xe/xe_shrinker.c       | 248 +++++++++++++++
 drivers/gpu/drm/xe/xe_shrinker.h       |  18 ++
 drivers/gpu/drm/xe/xe_ttm_sys_mgr.c    |   3 +-
 include/drm/ttm/ttm_backup.h           | 137 ++++++++
 include/drm/ttm/ttm_bo.h               |  88 ++++++
 include/drm/ttm/ttm_pool.h             |   6 +
 include/drm/ttm/ttm_resource.h         |  11 +-
 include/drm/ttm/ttm_tt.h               |  30 ++
 21 files changed, 1576 insertions(+), 55 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 include/drm/ttm/ttm_backup.h

-- 
2.46.0


^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2024-09-18 11:42 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-09-16 14:51 [PATCH v10 0/7] TTM shrinker helpers and xe buffer object shrinker Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 1/7] drm/ttm: Balance ttm_resource_cursor_init() and ttm_resource_cursor_fini() Thomas Hellström
2024-09-18 11:42   ` Christian König
2024-09-16 14:51 ` [PATCH v10 2/7] drm/ttm: Add a virtual base class for graphics memory backup Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 3/7] drm/ttm/pool: Provide a helper to shrink pages Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 4/7] drm/ttm: Use fault-injection to test error paths Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 5/7] drm/ttm: Add a shrinker helper and a macro to perform LRU iteration Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 6/7] drm/xe: Add a shrinker for xe bos Thomas Hellström
2024-09-16 14:51 ` [PATCH v10 7/7] drm/xe: Increase the XE_PL_TT watermark Thomas Hellström
2024-09-16 14:56 ` ✓ CI.Patch_applied: success for TTM shrinker helpers and xe buffer object shrinker (rev9) Patchwork
2024-09-16 14:57 ` ✗ CI.checkpatch: warning " Patchwork
2024-09-16 14:58 ` ✓ CI.KUnit: success " Patchwork
2024-09-16 15:09 ` ✓ CI.Build: " Patchwork
2024-09-16 15:12 ` ✓ CI.Hooks: " Patchwork
2024-09-16 15:13 ` ✗ CI.checksparse: warning " Patchwork
2024-09-16 15:41 ` ✓ CI.BAT: success " Patchwork
2024-09-16 18:40 ` ✗ CI.FULL: failure " Patchwork

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