[PATCH v11 0/5] rework bo mem stats tracking

[Yunxiang Li]

Right now every time the fdinfo is read, we go through the vm lists and
lock all the BOs to calcuate the statistics. This causes a lot of lock
contention when the VM is actively used. It gets worse if there is a lot
of shared BOs or if there's a lot of submissions. We have seen
submissions lock-up for seconds due to fdinfo for some workload.
Therefore, rework the implementation to track the BOs as they get moved
around.

The amd-only visible memory stat is removed to simplify implementation,
it's unclear how useful this stat is since kernel map/unmap BOs whenever
it wants to and on a modern system all of VRAM can be mapped if needed.

v5: rebase on top of the drm_print_memory_stats refactor
v6: split the drm changes into a separate patch for drm-devel review,
fix handling of drm-total- vs drm-resident- and handle drm-purgable-.
v7: make drm-active- optional
v8: clearify documentation, minor tweaks, and some bug fixes found
during testing
v9: documentation fix as suggested, no functional change
v10: change how gem objects shared via flink is counted, and fix a race
between fdinfo read and buffer move
v11: drop the v10 flink changes and instead hook into gem open/close

Yunxiang Li (5):
  drm: add drm_memory_stats_is_zero
  drm: make drm-active- stats optional
  Documentation/gpu: Clarify drm memory stats definition
  drm/amdgpu: remove unused function parameter
  drm/amdgpu: track bo memory stats at runtime

 Documentation/gpu/drm-usage-stats.rst       |  54 ++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c      |   4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_fdinfo.c  |  17 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c     |   6 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c  | 111 ++++-------
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h  |   4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |   4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c      | 208 +++++++++++++++-----
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      |  26 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c   |   1 +
 drivers/gpu/drm/drm_file.c                  |  23 ++-
 drivers/gpu/drm/i915/i915_drm_client.c      |   1 +
 drivers/gpu/drm/xe/xe_drm_client.c          |   1 +
 include/drm/drm_file.h                      |   1 +
 include/drm/drm_gem.h                       |  14 +-
 16 files changed, 289 insertions(+), 188 deletions(-)

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2.47.0