Exploring the latest code on github. Comparing the two.
Again, no guarantees. This is just a lead, for the brave at heart ....
--- tick-sched-2.6.35-23.c 2010-12-06 22:44:02.821102001 +0530
+++ tick-sched-2.6.37-github.c 2010-12-06 22:42:40.451102001 +0530
@@ -405,13 +405,7 @@ void tick_nohz_stop_sched_tick(int inidl
* the scheduler tick in nohz_restart_sched_tick.
*/
if (!ts->tick_stopped) {
- if (select_nohz_load_balancer(1)) {
- /*
- * sched tick not stopped!
- */
- cpumask_clear_cpu(cpu, nohz_cpu_mask);
- goto out;
- }
+ select_nohz_load_balancer(1);
ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
ts->tick_stopped = 1;
@@ -780,7 +774,6 @@ void tick_setup_sched_timer(void)
{
struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
ktime_t now = ktime_get();
- u64 offset;
/*
* Emulate tick processing via per-CPU hrtimers:
@@ -790,10 +783,6 @@ void tick_setup_sched_timer(void)
/* Get the next period (per cpu) */
hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
- offset = ktime_to_ns(tick_period) >> 1;
- do_div(offset, num_possible_cpus());
- offset *= smp_processor_id();
- hrtimer_add_expires_ns(&ts->sched_timer, offset);
for (;;) {
hrtimer_forward(&ts->sched_timer, now, tick_period);
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/524281
Title:
Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core
2 Duo even with only 1 core enabled
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
