On 8/20/2026 8:41 PM, Guopeng Zhang wrote:
From: Guopeng Zhang <[email protected]>
update_prstate() uses effective_xcpus for isolation accounting and
housekeeping checks when switching a partition between root and
isolated. The mask also includes CPUs granted to valid child partitions.
Such a type change can alter isolation accounting for child-owned CPUs
or fail a housekeeping check because of a CPU the parent does not own.
A rejected type change can leave CPUs assigned to the invalidated
partition instead of returning them to the partition that owns the
invalidated subtree. When cpuset.cpus changes, child validation can use
the old parent mask, and a remote update can observe stale cpus_allowed
when it revisits a cpuset. Direct and propagated invalidation can leave
isolated_cpus reflecting the released partition's type instead of the
type of the partition receiving its CPUs. Releasing an isolated
partition can clear boot-isolated CPUs from isolated_cpus.
Limit type-change checks and accounting to CPUs owned directly by the
partition. Preserve boot-isolated CPUs when a partition is released,
return CPUs after rejected type changes, validate children against the
new parent mask, and publish cpus_allowed before a partition update can
revisit the cpuset. Fix isolation accounting during direct and
propagated invalidation.
Patch 1 removes an invalid selftest comparison that makes
test_cpuset_prs.sh fail when boot-time domain isolation is configured.
Each kernel fix is followed by a focused selftest update.
Guopeng Zhang (17):
selftests/cgroup: Drop invalid boot isolation comparison
cgroup/cpuset: Preserve boot-isolated CPUs on partition release
selftests/cgroup: Test boot-isolated CPU partition release
cgroup/cpuset: Limit type-change accounting to owned CPUs
selftests/cgroup: Test isolated CPU accounting on type changes
cgroup/cpuset: Validate type changes against owned CPUs
selftests/cgroup: Test type-change validation with child-owned CPUs
cgroup/cpuset: Release CPUs when a type change is rejected
selftests/cgroup: Test rejected partition type changes
cgroup/cpuset: Fix isolated accounting on direct child invalidation
selftests/cgroup: Test isolation accounting on direct child
invalidation
cgroup/cpuset: Invalidate children outside the new CPU mask
selftests/cgroup: Test child invalidation after shrinking cpuset.cpus
cgroup/cpuset: Publish cpus_allowed before partition updates
selftests/cgroup: Test shrinking cpuset.cpus in a remote partition
cgroup/cpuset: Fix isolated accounting on propagated invalidation
selftests/cgroup: Test isolation accounting on propagated invalidation
kernel/cgroup/cpuset.c | 162 ++++++++++--
.../selftests/cgroup/test_cpuset_prs.sh | 231 +++++++++++++++++-
2 files changed, 361 insertions(+), 32 deletions(-)
base-commit: 6a746cd265aed59107ebdaa9ce039bb832922969
Hi Guopeng,
This is a fairly large series, which may make the review process challenging. I
would suggest splitting it into smaller, more focused patches. It would also be
very helpful if you could provide a reproducer for each bug you are trying to
fix, so that we can verify the issue and the fix more effectively.
--
Best regards
Ridong
