diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index e4a5888549a..e60786eb731 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1406,7 +1406,16 @@ static int wake_idle(int cpu, struct task_struct *p) struct sched_domain *sd; int i; - if (idle_cpu(cpu)) + /* + * If it is idle, then it is the best cpu to run this task. + * + * This cpu is also the best, if it has more than one task already. + * Siblings must be also busy(in most cases) as they didn't already + * pickup the extra load from this cpu and hence we need not check + * sibling runqueue info. This will avoid the checks and cache miss + * penalities associated with that. + */ + if (idle_cpu(cpu) || cpu_rq(cpu)->nr_running > 1) return cpu; for_each_domain(cpu, sd) { |