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Subject[tip:sched/core] sched/fair: Remove empty idle enter and exit functions
Commit-ID:  38c6ade2dd4dcc3bca06c981e2a1b91289046177
Gitweb: http://git.kernel.org/tip/38c6ade2dd4dcc3bca06c981e2a1b91289046177
Author: Dietmar Eggemann <dietmar.eggemann@arm.com>
AuthorDate: Tue, 20 Oct 2015 13:04:41 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 23 Nov 2015 09:37:51 +0100

sched/fair: Remove empty idle enter and exit functions

Commit cd126afe838d ("sched/fair: Remove rq's runnable avg") got rid of
rq->avg and so there is no need to update it any more when entering or
exiting idle.

Remove the now empty functions idle_{enter|exit}_fair().

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yuyang Du <yuyang.du@intel.com>
Link: http://lkml.kernel.org/r/1445342681-17171-1-git-send-email-dietmar.eggemann@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/fair.c | 24 +-----------------------
kernel/sched/idle_task.c | 1 -
kernel/sched/sched.h | 8 --------
3 files changed, 1 insertion(+), 32 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f04fda8..2779dec 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2835,24 +2835,6 @@ void remove_entity_load_avg(struct sched_entity *se)
atomic_long_add(se->avg.util_avg, &cfs_rq->removed_util_avg);
}

-/*
- * Update the rq's load with the elapsed running time before entering
- * idle. if the last scheduled task is not a CFS task, idle_enter will
- * be the only way to update the runnable statistic.
- */
-void idle_enter_fair(struct rq *this_rq)
-{
-}
-
-/*
- * Update the rq's load with the elapsed idle time before a task is
- * scheduled. if the newly scheduled task is not a CFS task, idle_exit will
- * be the only way to update the runnable statistic.
- */
-void idle_exit_fair(struct rq *this_rq)
-{
-}
-
static inline unsigned long cfs_rq_runnable_load_avg(struct cfs_rq *cfs_rq)
{
return cfs_rq->runnable_load_avg;
@@ -7248,8 +7230,6 @@ static int idle_balance(struct rq *this_rq)
int pulled_task = 0;
u64 curr_cost = 0;

- idle_enter_fair(this_rq);
-
/*
* We must set idle_stamp _before_ calling idle_balance(), such that we
* measure the duration of idle_balance() as idle time.
@@ -7330,10 +7310,8 @@ out:
if (this_rq->nr_running != this_rq->cfs.h_nr_running)
pulled_task = -1;

- if (pulled_task) {
- idle_exit_fair(this_rq);
+ if (pulled_task)
this_rq->idle_stamp = 0;
- }

return pulled_task;
}
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index c4ae0f1..47ce949 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -47,7 +47,6 @@ dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags)

static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
{
- idle_exit_fair(rq);
rq_last_tick_reset(rq);
}

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index efd3bfc..2eb2002 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1249,16 +1249,8 @@ extern void update_group_capacity(struct sched_domain *sd, int cpu);

extern void trigger_load_balance(struct rq *rq);

-extern void idle_enter_fair(struct rq *this_rq);
-extern void idle_exit_fair(struct rq *this_rq);
-
extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask);

-#else
-
-static inline void idle_enter_fair(struct rq *rq) { }
-static inline void idle_exit_fair(struct rq *rq) { }
-
#endif

#ifdef CONFIG_CPU_IDLE

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