From 3d36aebc2e78923095575df954f3f3b430ac0a30 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Wed, 4 Jun 2014 16:17:33 +0200 Subject: nohz: Support nohz full remote kick Remotely kicking a full nohz CPU in order to make it re-evaluate its next tick is currently implemented using the scheduler IPI. However this bloats a scheduler fast path with an off-topic feature. The scheduler tick was abused here for its cool "callable anywhere/anytime" properties. But now that the irq work subsystem can queue remote callbacks, it's a perfect fit to safely queue IPIs when interrupts are disabled without worrying about concurrent callers. So lets implement remote kick on top of irq work. This is going to be used when a new event requires the next tick to be recalculated: more than 1 task competing on the CPU, timer armed, ... Acked-by: Peter Zijlstra Cc: Andrew Morton Cc: Ingo Molnar Cc: Kevin Hilman Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Viresh Kumar Signed-off-by: Frederic Weisbecker --- kernel/time/tick-sched.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'kernel/time') diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 6558b7ac112d..3d63944a3eca 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -224,13 +224,15 @@ static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = { }; /* - * Kick the current CPU if it's full dynticks in order to force it to + * Kick the CPU if it's full dynticks in order to force it to * re-evaluate its dependency on the tick and restart it if necessary. */ -void tick_nohz_full_kick(void) +void tick_nohz_full_kick_cpu(int cpu) { - if (tick_nohz_full_cpu(smp_processor_id())) - irq_work_queue(&__get_cpu_var(nohz_full_kick_work)); + if (!tick_nohz_full_cpu(cpu)) + return; + + irq_work_queue_on(&per_cpu(nohz_full_kick_work, cpu), cpu); } static void nohz_full_kick_ipi(void *info) -- cgit