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Message-Id: <ee36ee687fa390924b88ce40bf1789a8abb340bd.1457082108.git.jslaby@suse.cz>
Date: Fri, 4 Mar 2016 10:01:25 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
alex.shi@...aro.org, mingo@...nel.org,
Steven Rostedt <rostedt@...dmis.org>,
Byungchul Park <byungchul.park@....com>,
Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 040/116] sched: Clean up idle task SMP logic
From: Peter Zijlstra <peterz@...radead.org>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 6c3b4d44ba2838f00614a5a2d777d4401e0bfd71 upstream.
The idle post_schedule flag is just a vile waste of time, furthermore
it appears unneeded, move the idle_enter_fair() call into
pick_next_task_idle().
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: alex.shi@...aro.org
Cc: mingo@...nel.org
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/n/tip-aljykihtxJt3mkokxi0qZurb@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Byungchul Park <byungchul.park@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
kernel/sched/idle_task.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index d8da01008d39..ecc371e86da1 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -19,11 +19,6 @@ static void pre_schedule_idle(struct rq *rq, struct task_struct *prev)
idle_exit_fair(rq);
rq_last_tick_reset(rq);
}
-
-static void post_schedule_idle(struct rq *rq)
-{
- idle_enter_fair(rq);
-}
#endif /* CONFIG_SMP */
/*
* Idle tasks are unconditionally rescheduled:
@@ -37,8 +32,7 @@ static struct task_struct *pick_next_task_idle(struct rq *rq)
{
schedstat_inc(rq, sched_goidle);
#ifdef CONFIG_SMP
- /* Trigger the post schedule to do an idle_enter for CFS */
- rq->post_schedule = 1;
+ idle_enter_fair(rq);
#endif
return rq->idle;
}
@@ -102,7 +96,6 @@ const struct sched_class idle_sched_class = {
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_idle,
.pre_schedule = pre_schedule_idle,
- .post_schedule = post_schedule_idle,
#endif
.set_curr_task = set_curr_task_idle,
--
2.7.2
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