diff options
| -rw-r--r-- | kernel/cgroup/cpuset.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 315f8cbd6d35..f9b97f65e204 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -964,6 +964,7 @@ static int generate_sched_domains(cpumask_var_t **domains, /* Special case for the 99% of systems with one, full, sched domain */ if (root_load_balance && !top_cpuset.nr_subparts) { +single_root_domain: ndoms = 1; doms = alloc_sched_domains(ndoms); if (!doms) @@ -1022,6 +1023,13 @@ static int generate_sched_domains(cpumask_var_t **domains, } rcu_read_unlock(); + /* + * If there are only isolated partitions underneath the cgroup root, + * we can optimize out unneeded sched domains scanning. + */ + if (root_load_balance && (csn == 1)) + goto single_root_domain; + for (i = 0; i < csn; i++) csa[i]->pn = i; ndoms = csn; |