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cgroup/cpuset: Set isolated_cpus_updating only if isolated_cpus is changed

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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>
This commit is contained in:
Waiman Long 2026-02-21 13:54:14 -05:00 • committed by Tejun Heo
parent 17b1860034
commit 14713ed9e9
1 changed files with 7 additions and 3 deletions
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10
kernel/cgroup/cpuset.c
View file

@ -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;
}