Now that we have a nohz full remote kick based on irq work, lets use
it to notify a CPU that it's exiting single task mode.
This unbloats a bit the scheduler IPI that the nohz code was abusing
for its cool "callable anywhere/anytime" properties.
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Kevin Hilman <khil...@linaro.org>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
---
kernel/sched/core.c | 5 +----
kernel/sched/sched.h | 2 +-
2 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 03dc7e9..5d25274 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1506,9 +1506,7 @@ void scheduler_ipi(void)
*/
preempt_fold_need_resched();
- if (llist_empty(&this_rq()->wake_list)
- && !tick_nohz_full_cpu(smp_processor_id())
- && !got_nohz_idle_kick())
+ if (llist_empty(&this_rq()->wake_list) && !got_nohz_idle_kick())
return;
/*
@@ -1525,7 +1523,6 @@ void scheduler_ipi(void)
* somewhat pessimize the simple resched case.
*/
irq_enter();
- tick_nohz_full_check();
sched_ttwu_pending();
/*
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 456e492..6089e00 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1225,7 +1225,7 @@ static inline void inc_nr_running(struct rq *rq)
if (tick_nohz_full_cpu(rq->cpu)) {
/* Order rq->nr_running write against the IPI */
smp_wmb();
- smp_send_reschedule(rq->cpu);
+ tick_nohz_full_kick_cpu(rq->cpu);
}
}
#endif
--
1.8.3.1
--
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