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nohz: Implement wide kick on top of irq work

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It simplifies it and allows wide kick to be performed, even when IRQs
are disabled, without an asynchronous level in the middle.

This comes at a cost of some more overhead on features like perf and
posix cpu timers slow-paths, which is probably not much important
for nohz full users.

Requested-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker 2015-12-07 16:55:23 +01:00
parent 5fd7a09cfb
commit 8537bb95a6
1 changed files with 4 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/time/tick-sched.c
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@ -234,24 +234,20 @@ void tick_nohz_full_kick_cpu(int cpu)
irq_work_queue_on(&per_cpu(nohz_full_kick_work, cpu), cpu);
}
static void nohz_full_kick_ipi(void *info)
{
/* Empty, the tick restart happens on tick_nohz_irq_exit() */
}
/*
* Kick all full dynticks CPUs in order to force these to re-evaluate
* their dependency on the tick and restart it if necessary.
*/
void tick_nohz_full_kick_all(void)
{
int cpu;
if (!tick_nohz_full_running)
return;
preempt_disable();
smp_call_function_many(tick_nohz_full_mask,
nohz_full_kick_ipi, NULL, false);
tick_nohz_full_kick();
for_each_cpu_and(cpu, tick_nohz_full_mask, cpu_online_mask)
tick_nohz_full_kick_cpu(cpu);
preempt_enable();
}