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Subject[tip:sched/core] sched/fair: Remove rq's runnable avg
Commit-ID:  cd126afe838d7ea9b971cdea087fd498a7293c7f
Gitweb: http://git.kernel.org/tip/cd126afe838d7ea9b971cdea087fd498a7293c7f
Author: Yuyang Du <yuyang.du@intel.com>
AuthorDate: Wed, 15 Jul 2015 08:04:36 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 3 Aug 2015 12:21:28 +0200

sched/fair: Remove rq's runnable avg

The current rq->avg is not used at all since its merge into the kernel,
and the code is in the scheduler's hot path, so remove it.

Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Yuyang Du <yuyang.du@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
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: arjan@linux.intel.com
Cc: bsegall@google.com
Cc: fengguang.wu@intel.com
Cc: len.brown@intel.com
Cc: morten.rasmussen@arm.com
Cc: pjt@google.com
Cc: rafael.j.wysocki@intel.com
Cc: umgwanakikbuti@gmail.com
Cc: vincent.guittot@linaro.org
Link: http://lkml.kernel.org/r/1436918682-4971-2-git-send-email-yuyang.du@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/debug.c | 7 +------
kernel/sched/fair.c | 25 ++++---------------------
kernel/sched/sched.h | 2 --
3 files changed, 5 insertions(+), 29 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 4222ec5..363b7e8 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -68,13 +68,8 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group
#define PN(F) \
SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))

- if (!se) {
- struct sched_avg *avg = &cpu_rq(cpu)->avg;
- P(avg->runnable_avg_sum);
- P(avg->avg_period);
+ if (!se)
return;
- }
-

PN(se->exec_start);
PN(se->vruntime);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ea23f9f..90292c67 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2724,19 +2724,12 @@ static inline void __update_group_entity_contrib(struct sched_entity *se)
}
}

-static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
-{
- __update_entity_runnable_avg(rq_clock_task(rq), cpu_of(rq), &rq->avg,
- runnable, runnable);
- __update_tg_runnable_avg(&rq->avg, &rq->cfs);
-}
#else /* CONFIG_FAIR_GROUP_SCHED */
static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
int force_update) {}
static inline void __update_tg_runnable_avg(struct sched_avg *sa,
struct cfs_rq *cfs_rq) {}
static inline void __update_group_entity_contrib(struct sched_entity *se) {}
-static inline void update_rq_runnable_avg(struct rq *rq, int runnable) {}
#endif /* CONFIG_FAIR_GROUP_SCHED */

static inline void __update_task_entity_contrib(struct sched_entity *se)
@@ -2940,7 +2933,6 @@ static inline void dequeue_entity_load_avg(struct cfs_rq *cfs_rq,
*/
void idle_enter_fair(struct rq *this_rq)
{
- update_rq_runnable_avg(this_rq, 1);
}

/*
@@ -2950,7 +2942,6 @@ void idle_enter_fair(struct rq *this_rq)
*/
void idle_exit_fair(struct rq *this_rq)
{
- update_rq_runnable_avg(this_rq, 0);
}

static int idle_balance(struct rq *this_rq);
@@ -2959,7 +2950,6 @@ static int idle_balance(struct rq *this_rq);

static inline void update_entity_load_avg(struct sched_entity *se,
int update_cfs_rq) {}
-static inline void update_rq_runnable_avg(struct rq *rq, int runnable) {}
static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
struct sched_entity *se,
int wakeup) {}
@@ -4258,10 +4248,9 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
update_entity_load_avg(se, 1);
}

- if (!se) {
- update_rq_runnable_avg(rq, rq->nr_running);
+ if (!se)
add_nr_running(rq, 1);
- }
+
hrtick_update(rq);
}

@@ -4319,10 +4308,9 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
update_entity_load_avg(se, 1);
}

- if (!se) {
+ if (!se)
sub_nr_running(rq, 1);
- update_rq_runnable_avg(rq, 1);
- }
+
hrtick_update(rq);
}

@@ -6005,9 +5993,6 @@ static void __update_blocked_averages_cpu(struct task_group *tg, int cpu)
*/
if (!se->avg.runnable_avg_sum && !cfs_rq->nr_running)
list_del_leaf_cfs_rq(cfs_rq);
- } else {
- struct rq *rq = rq_of(cfs_rq);
- update_rq_runnable_avg(rq, rq->nr_running);
}
}

@@ -7988,8 +7973,6 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)

if (numabalancing_enabled)
task_tick_numa(rq, curr);
-
- update_rq_runnable_avg(rq, 1);
}

/*
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 84d4879..e13210c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -595,8 +595,6 @@ struct rq {
#ifdef CONFIG_FAIR_GROUP_SCHED
/* list of leaf cfs_rq on this cpu: */
struct list_head leaf_cfs_rq_list;
-
- struct sched_avg avg;
#endif /* CONFIG_FAIR_GROUP_SCHED */

/*

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