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Date: Thu, 5 Jun 2014 06:51:37 +0800
From: Yuyang Du <yuyang.du@...el.com>
To: mingo@...hat.com, peterz@...radead.org, rafael.j.wysocki@...el.com,
linux-kernel@...r.kernel.org, pjt@...gle.com, bsegall@...gle.com
Cc: arjan.van.de.ven@...el.com, len.brown@...el.com,
alan.cox@...el.com, mark.gross@...el.com, morten.rasmussen@....com,
vincent.guittot@...aro.org, jacob.jun.pan@...ux.intel.com,
fengguang.wu@...el.com, yuyang.du@...el.com
Subject: [PATCH] sched: remove rq's runnable load average
Per rq runnable average has not been made use of anywhere since it was merged by:
commit 18bf2805d9b30cb823d4919b42cd230f59c7ce1f
Author: Ben Segall <bsegall@...gle.com>
Date: Thu Oct 4 12:51:20 2012 +0200
sched: Maintain per-rq runnable averages
Since runqueues do not have a corresponding sched_entity we instead embed a
sched_avg structure directly.
Signed-off-by: Ben Segall <bsegall@...gle.com>
Reviewed-by: Paul Turner <pjt@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20120823141506.442637130@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
So removing it does not hurt anything but can benefit PnP as the average trakcing
is in scheduler critical path.
Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
kernel/sched/debug.c | 8 --------
kernel/sched/fair.c | 24 ++++--------------------
kernel/sched/sched.h | 2 --
3 files changed, 4 insertions(+), 30 deletions(-)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 695f977..4b864c7 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -68,14 +68,6 @@ 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->runnable_avg_period);
- return;
- }
-
-
PN(se->exec_start);
PN(se->vruntime);
PN(se->sum_exec_runtime);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0fdb96d..18ee21d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2378,18 +2378,12 @@ 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), &rq->avg, 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)
@@ -2562,7 +2556,6 @@ 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);
}
/*
@@ -2572,7 +2565,6 @@ 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);
@@ -2581,7 +2573,6 @@ 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) {}
@@ -3882,10 +3873,9 @@ 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)
inc_nr_running(rq);
- }
+
hrtick_update(rq);
}
@@ -3943,10 +3933,9 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
update_entity_load_avg(se, 1);
}
- if (!se) {
+ if (!se)
dec_nr_running(rq);
- update_rq_runnable_avg(rq, 1);
- }
+
hrtick_update(rq);
}
@@ -5364,9 +5353,6 @@ 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);
}
}
@@ -7243,8 +7229,6 @@ 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 456e492..5a66776 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -552,8 +552,6 @@ 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 */
/*
--
1.9.1
--
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