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drm/ttm: Move swapped objects off the manager's LRU list

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Resources of swapped objects remains on the TTM_PL_SYSTEM manager's
LRU list, which is bad for the LRU walk efficiency.

Rename the device-wide "pinned" list to "unevictable" and move
also resources of swapped-out objects to that list.

An alternative would be to create an "UNEVICTABLE" priority to
be able to keep the pinned- and swapped objects on their
respective manager's LRU without affecting the LRU walk efficiency.

v2:
- Remove a bogus WARN_ON (Christian König)
- Update ttm_resource_[add|del] bulk move (Christian König)
- Fix TTM KUNIT tests (Intel CI)
v3:
- Check for non-NULL bo->resource in ttm_bo_populate().
v4:
- Don't move to LRU tail during swapout until the resource
  is properly swapped or there was a swapout failure.
  (Intel Ci)
- Add a newline after checkpatch check.
v5:
- Introduce ttm_resource_is_swapped() to avoid a corner-case where
  a newly created resource was considered swapped. (Intel CI)
v6:
- Move an assert.

Cc: Christian König <christian.koenig@amd.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: <dri-devel@lists.freedesktop.org>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240911121859.85387-2-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström
2024-09-11 14:18:58 +02:00
parent 42aa18d1c3
commit fc5d96670e
15 changed files with 109 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/ttm/tests/ttm_resource_test.c
View File

@@ -164,18 +164,18 @@ static void ttm_resource_init_pinned(struct kunit *test)
res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, res);
KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->unevictable));
dma_resv_lock(bo->base.resv, NULL);
ttm_bo_pin(bo);
ttm_resource_init(bo, place, res);
KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->unevictable));
ttm_bo_unpin(bo);
ttm_resource_fini(man, res);
dma_resv_unlock(bo->base.resv);
KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->unevictable));
}
static void ttm_resource_fini_basic(struct kunit *test)