Commit-ID: fd2ac4f4a65a7f34b0bc6433fcca1192d7ba8b8e
Gitweb: http://git.kernel.org/tip/fd2ac4f4a65a7f34b0bc6433fcca1192d7ba8b8e
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Tue, 18 Mar 2014 21:12:53 +0100
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Mon, 16 Jun 2014 16:26:55 +0200
nohz: Use nohz own full kick on 2nd task enqueue
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.
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
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 feb5496..13f5857 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1574,9 +1574,7 @@ 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;
/*
@@ -1593,7 +1591,6 @@ 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 31cc02e..599a72af 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1223,7 +1223,7 @@ static inline void add_nr_running(struct rq *rq, unsigned count)
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
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