[PATCH 5/6] cgroup/cpuset: optimize cpuset_mems_allowed_intersects()

Yury Norov
2024-05-13T22:01:58Z

If the function is called with tsk1 == tsk2, we know for sure that their
mems_allowed nodes do intersect, and so we can return immediately instead
of checking the nodes content.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
kernel/cgroup/cpuset.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 4237c8748715..47ed206d4890 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -5010,6 +5010,9 @@ EXPORT_SYMBOL_GPL(cpuset_mem_spread_node);
int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
const struct task_struct *tsk2)
{
+ if (tsk1 == tsk2)
+ return 1;
+
return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
}

--
2.40.1