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>

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This commit is contained in:

Maarten Lankhorst 2024-12-04 14:44:03 +01:00 • committed by Maxime Ripard

parent 7b0af165e2

commit 2b624a2c18

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6 changed files with 89 additions and 22 deletions

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18

drivers/gpu/drm/ttm/tests/ttm_bo_test.c

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4

drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c

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2

drivers/gpu/drm/ttm/tests/ttm_resource_test.c

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52

drivers/gpu/drm/ttm/ttm_bo.c

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23

drivers/gpu/drm/ttm/ttm_resource.c

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12

include/drm/ttm/ttm_resource.h

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