summaryrefslogtreecommitdiff
path: root/kernel/cgroup
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/cgroup')
-rw-r--r--kernel/cgroup/cpuset.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index e136269c152c..a46deb8a64dd 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -2487,6 +2487,7 @@ static int cpuset_can_attach(struct cgroup_taskset *tset)
struct cgroup_subsys_state *css;
struct cpuset *cs, *oldcs;
struct task_struct *task;
+ bool cpus_updated, mems_updated;
int ret;
/* used later by cpuset_attach() */
@@ -2501,13 +2502,25 @@ static int cpuset_can_attach(struct cgroup_taskset *tset)
if (ret)
goto out_unlock;
+ cpus_updated = !cpumask_equal(cs->effective_cpus, oldcs->effective_cpus);
+ mems_updated = !nodes_equal(cs->effective_mems, oldcs->effective_mems);
+
cgroup_taskset_for_each(task, css, tset) {
ret = task_can_attach(task);
if (ret)
goto out_unlock;
- ret = security_task_setscheduler(task);
- if (ret)
- goto out_unlock;
+
+ /*
+ * Skip rights over task check in v2 when nothing changes,
+ * migration permission derives from hierarchy ownership in
+ * cgroup_procs_write_permission()).
+ */
+ if (!cgroup_subsys_on_dfl(cpuset_cgrp_subsys) ||
+ (cpus_updated || mems_updated)) {
+ ret = security_task_setscheduler(task);
+ if (ret)
+ goto out_unlock;
+ }
if (dl_task(task)) {
cs->nr_migrate_dl_tasks++;