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>
---
kernel/cgroup/cpuset.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index e8c0b3cfd1f9..05adf6697030 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1179,11 +1179,15 @@ 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;
}
--
2.53.0