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drm/ttm: Handle cgroup based eviction in TTM

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cgroup resource allocation has to be handled in TTM, so -EAGAIN from
cgroups can be converted into -ENOSPC, and the limitcg can be properly
evicted in ttm code.

When hitting a resource limit through -EAGAIN, the cgroup for which the
limit is hit is also returned. This allows eviction to delete only from
cgroups which are a subgroup of the current cgroup.

The returned CSS is used to determine if eviction is valuable for a
given resource, and allows TTM to only target specific resources to
lower memory usage.

Co-developed-by: Friedrich Vock <friedrich.vock@gmx.de>
Signed-off-by: Friedrich Vock <friedrich.vock@gmx.de>
Co-developed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20241204134410.1161769-4-dev@lankhorst.se
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Maarten Lankhorst
2024-12-04 14:44:03 +01:00
committed by Maxime Ripard
parent 7b0af165e2
commit 2b624a2c18
6 changed files with 89 additions and 22 deletions
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4
drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
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@@ -542,7 +542,7 @@ static void ttm_bo_validate_no_placement_signaled(struct kunit *test)
bo->ttm = old_tt;
}
err = ttm_resource_alloc(bo, place, &bo->resource);
err = ttm_resource_alloc(bo, place, &bo->resource, NULL);
KUNIT_EXPECT_EQ(test, err, 0);
KUNIT_ASSERT_EQ(test, man->usage, size);
@@ -603,7 +603,7 @@ static void ttm_bo_validate_no_placement_not_signaled(struct kunit *test)
bo = ttm_bo_kunit_init(test, test->priv, size, NULL);
bo->type = params->bo_type;
err = ttm_resource_alloc(bo, place, &bo->resource);
err = ttm_resource_alloc(bo, place, &bo->resource, NULL);
KUNIT_EXPECT_EQ(test, err, 0);
placement = kunit_kzalloc(test, sizeof(*placement), GFP_KERNEL);