ubuntu-x-swat team mailing list archive

[Gurmeet <524281@xxxxxxxxxxxxxxxxxx>]

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-X,
which is subscribed to xorg in 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