From: Michael Wang <[email protected]> In real world, tick_nohz_idle_enter() will be invoked by idle thread when the cpu change from active to idle, and will only be invoked again after tick_nohz_idle_exit() was invoked by idle thread when cpu is going to recover, invoke it multiple times in one idle may cause unexpected troubles.
The patch add a check to avoid invoke tick_nohz_idle_enter() again after idle. Signed-off-by: Michael Wang <[email protected]> --- tools/linsched/hrtimer.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-) diff --git a/tools/linsched/hrtimer.c b/tools/linsched/hrtimer.c index de88b25..3203253 100644 --- a/tools/linsched/hrtimer.c +++ b/tools/linsched/hrtimer.c @@ -149,6 +149,15 @@ void linsched_check_idle_cpu(void) } } +void linsched_enter_idle(void) +{ + int cpu = smp_processor_id(); + struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); + + if (!ts->inidle && idle_cpu(cpu)) + tick_nohz_idle_enter(); +} + /* Run a simulation for some number of ticks. Each tick, * scheduling and load balancing decisions are made. Obviously, we * could create tasks, change priorities, etc., at certain ticks @@ -210,7 +219,7 @@ void linsched_run_sim(int sim_ticks) BUG_ON(irqs_disabled()); if (idle_cpu(active_cpu) && !need_resched()) { - tick_nohz_idle_enter(); + linsched_enter_idle(); } else { linsched_current_handler(); } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
