diff options
| author | Waiman Long <longman@redhat.com> | 2026-02-21 13:54:14 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-02-23 10:41:09 -1000 |
| commit | 14713ed9e9291813849018f32edbf5f6de362088 (patch) | |
| tree | afa4d27ce68b42230e7334124eae560dc8c0870a /kernel/cgroup | |
| parent | 17b1860034c769c9f7669ae2612e91ef8fdde769 (diff) | |
cgroup/cpuset: Set isolated_cpus_updating only if isolated_cpus is changed
As cpuset is updating HK_TYPE_DOMAIN housekeeping mask when there is
a change in the set of isolated CPUs, making this change is now more
costly than before. Right now, the isolated_cpus_updating flag can be
set even if there is no real change in isolated_cpus. Put in additional
checks to make sure that isolated_cpus_updating is set only if there
is a real change in isolated_cpus.
Reviewed-by: Chen Ridong <chenridong@huaweicloud.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 165e2967025b..edc67c6aa553 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -1180,11 +1180,15 @@ static void isolated_cpus_update(int old_prs, int new_prs, struct cpumask *xcpus WARN_ON_ONCE(old_prs == new_prs); lockdep_assert_held(&callback_lock); lockdep_assert_held(&cpuset_mutex); - if (new_prs == PRS_ISOLATED) + if (new_prs == PRS_ISOLATED) { + if (cpumask_subset(xcpus, isolated_cpus)) + return; cpumask_or(isolated_cpus, isolated_cpus, xcpus); - else + } else { + if (!cpumask_intersects(xcpus, isolated_cpus)) + return; cpumask_andnot(isolated_cpus, isolated_cpus, xcpus); - + } isolated_cpus_updating = true; } |