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cgroup/cpuset: Add test for partition root invalidation returning wrong CPUs

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Add a test case to REMOTE_TEST_MATRIX covering the bug fixed by
commit 345f401666 ("cgroup/cpuset: Return only actually allocated
CPUs during partition invalidation"). The test verifies that when a
sibling partition root changes its cpuset.cpus to overlap with another
partition root, only actually allocated CPUs (effective_xcpus) are
returned to the parent, not all CPUs in cpus_allowed.

Signed-off-by: Shaojie Sun <sunshaojie@kylinos.cn>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Shaojie Sun
2026-08-11 17:58:48 +08:00
committed by Tejun Heo
parent 6dd5d93f6c
commit 44f57a2b1b
1 changed files with 6 additions and 0 deletions
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6
tools/testing/selftests/cgroup/test_cpuset_prs.sh
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@@ -502,6 +502,12 @@ REMOTE_TEST_MATRIX=(
" C1-4:P1 . C1-2:P1 C1-3:P2 . . \
. . P0 C2-3 . . p1:1,4|c11:1|c12:2-3 \
p1:P1|c11:P0|c12:P2 2-3"
# Changing a sibling partition's cpuset.cpus to overlap with another
# sibling partition should invalidate itself and return only actually
# allocated CPUs (effective_xcpus) to the parent.
" C1-4:P1 . C1-2:P1 C2-4:P2 . . \
. . . C1-2 . . p1:3-4|c11:1-2|c12:3-4 \
p1:P1|c11:P1|c12:P-2"
# Cpusets with empty cpuset.cpus should inherit parent's effective_cpus
" C1-4:P1 C5-6 C1-2 . C5 . \
. P1 P1 . . . p1:3-4|p2:5-6|c11:1-2|c12:3-4|c21:5|c22:5-6 \