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sched/fair: Remove empty idle enter and exit functions 

Commit cd126afe83 ("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>
This commit is contained in:
Dietmar Eggemann 2015-10-20 13:04:41 +01:00 committed by Ingo Molnar
parent 89b411081d
commit 38c6ade2dd
3 changed files with 1 additions and 32 deletions
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24
kernel/sched/fair.c
View File

@ -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;
}

1
kernel/sched/idle_task.c
View File

@ -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);
}

8
kernel/sched/sched.h
View File

@ -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