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>

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0b17424349eb4dafd76a2cf588748988ce51a295..548a4e2551a93a23a9a11fd8ad0717b23b8fd144 100644 (file)
--- 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();
 }