On Wed, 2011-12-28 at 09:22 +0100, Mike Galbraith wrote:
> (Hm, wonder if nohz is usable now... nope. Tell nohz that isolated
> cores don't play balancer again, maybe it'll work now)
Yup, worked. 60 core jitter test is approaching single digit. Woohoo.
---
kernel/sched_fair.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -4517,6 +4517,10 @@ void select_nohz_load_balancer(int stop_
{
int cpu = smp_processor_id();
+ /* Isolated cores do not play */
+ if (!cpu_rq(cpu)->sd)
+ return;
+
if (stop_tick) {
if (!cpu_active(cpu)) {
if (atomic_read(&nohz.load_balancer) != cpu)
--
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