This is a note to let you know that I've just added the patch titled
sched: Clean up idle task SMP logic
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-clean-up-idle-task-smp-logic.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6c3b4d44ba2838f00614a5a2d777d4401e0bfd71 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 17 Jan 2014 15:09:39 +0100
Subject: sched: Clean up idle task SMP logic
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: alex.shi@xxxxxxxxxx
Cc: mingo@xxxxxxxxxx
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-aljykihtxJt3mkokxi0qZurb@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Byungchul Park <byungchul.park@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/idle_task.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -19,11 +19,6 @@ static void pre_schedule_idle(struct rq
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_tas
{
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_clas
#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,
Patches currently in stable-queue which might be from peterz@xxxxxxxxxxxxx are
queue-3.14/sched-clean-up-idle-task-smp-logic.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html