Messages in this thread Patch in this message | | | Date | Mon, 16 Apr 2012 11:38:02 +0800 | From | Michael Wang <> | Subject | [RFC PATCH 3/4] linsched: avoid invoke "tick_nohz_idle_enter" when cpu in idle |
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From: Michael Wang <wangyun@linux.vnet.ibm.com>
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 going to recover.
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com> --- 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..1981bc9 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_cpu(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_cpu(); } else { linsched_current_handler(); } -- 1.7.1
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