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cgroup/cpuset: Add test cases for sibling CPU exclusion on partition update

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When sibling CPU exclusion occurs, a partition's effective_xcpus may be
a subset of its user_xcpus. The partcmd_update path must use
effective_xcpus instead of user_xcpus when calculating CPUs to return
to or request from the parent.

Add two test cases to verify this behavior:

  1) Narrowing cpuset.cpus to only the sibling-excluded CPUs should not
     return CPUs to parent that the partition never actually owned.

  2) Expanding cpuset.cpus after a sibling becomes a member should
     correctly request the additional CPUs from parent.

Co-developed-by: Zhang Guopeng <zhangguopeng@kylinos.cn>
Signed-off-by: Zhang Guopeng <zhangguopeng@kylinos.cn>
Signed-off-by: Sun Shaojie <sunshaojie@kylinos.cn>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Sun Shaojie 2026-05-27 15:05:09 +08:00 committed by Tejun Heo
parent 0a68853de2
commit 645c3b7ef1
1 changed files with 10 additions and 0 deletions
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10
tools/testing/selftests/cgroup/test_cpuset_prs.sh
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@ -492,6 +492,16 @@ REMOTE_TEST_MATRIX=(
" C1-5:P1 . C1-4:P1 C2-3 . . \
. . . P1 . . p1:5|c11:1-4|c12:5 \
p1:P1|c11:P1|c12:P-1"
# Narrowing cpuset.cpus to previously sibling-excluded CPUs should
# not return CPUs that were never actually owned.
" C1-4:P1 . C1-2:P1 C1-3:P2 . . \
. . . C3 . . p1:4|c11:1-2|c12:3 \
p1:P1|c11:P1|c12:P2 3"
# Expanding cpuset.cpus to include a previously sibling-excluded CPU
# after the sibling has become a member should correctly request it.
" 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"
)
#