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nohz: Re-evaluate the tick from the scheduler IPI

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The scheduler IPI is used by the scheduler to kick
full dynticks CPUs asynchronously when more than one
task are running or when a new timer list timer is
enqueued. This way the destination CPU can decide
to restart the tick to handle this new situation.

Now let's call that kick in the scheduler IPI.

(Reusing the scheduler IPI rather than implementing
a new IPI was suggested by Peter Zijlstra a while ago)

Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Geoff Levand <[email protected]>
Cc: Gilad Ben Yossef <[email protected]>
Cc: Hakan Akkan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Kevin Hilman <[email protected]>
Cc: Li Zhong <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
This commit is contained in:
Frederic Weisbecker 2013-04-20 15:27:08 +02:00
commit ff442c51f6
3 changed files with 6 additions and 2 deletions
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4
kernel/sched/core.c
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@ -1398,7 +1398,8 @@ static void sched_ttwu_pending(void)
void scheduler_ipi(void)
{
if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick())
if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick()
&& !tick_nohz_full_cpu(smp_processor_id()))
return;
/*
@ -1415,6 +1416,7 @@ void scheduler_ipi(void)
* somewhat pessimize the simple resched case.
*/
irq_enter();
tick_nohz_full_check();
sched_ttwu_pending();
/*