Add a test case covering the bug fixed by
commit 345f40166694 ("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 <[email protected]> --- tools/testing/selftests/cgroup/test_cpuset_prs.sh | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/cgroup/test_cpuset_prs.sh b/tools/testing/selftests/cgroup/test_cpuset_prs.sh index 0d41aa0d343d..a44e92c94081 100755 --- a/tools/testing/selftests/cgroup/test_cpuset_prs.sh +++ b/tools/testing/selftests/cgroup/test_cpuset_prs.sh @@ -393,6 +393,12 @@ TEST_MATRIX=( " C0-1:P1 . . P1:C2-3 C0-2 . . . 0 A1:0-1|XA1:0-1|B1:2-3 A1:P1|B1:P1" " C0-1 . . P1:C2-3 C0-2 . . . 0 A1:0-1|B1:2-3 A1:P0|B1:P1" + # However, a partition root changing its own cpuset.cpus to overlap with + # a sibling partition root will invalidate itself. Only actually allocated + # CPUs (effective_xcpus) should be returned to the parent, not all CPUs + # in cpus_allowed. The root cgroup effective CPUs must remain unchanged. + " C0-1:P1 . . C1-2:P1 . . . C0-1 0 A1:0-1 A1:P1|B1:P-1" + # cpuset.cpus can overlap with sibling cpuset.cpus.exclusive but not subsumed by it " C0-3 . . C4-5 X5 . . . 0 A1:0-3|B1:4-5" -- 2.25.1
