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authorFrederic Weisbecker <fweisbec@gmail.com>2015-12-07 16:55:23 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2016-02-13 15:34:28 +0100
commit8537bb95a63e4be330359721f0ecd422f4a4c0ca (patch)
tree09ff9ff84c7d1efc45cfa8ad506e9db6d4485506 /kernel/time
parent5fd7a09cfb8c6852f596c1f8c891c6158395250e (diff)
downloadlinux-8537bb95a63e4be330359721f0ecd422f4a4c0ca.tar.bz2
nohz: Implement wide kick on top of irq work
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>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-sched.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0b17424349eb..548a4e2551a9 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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();
}