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Date: Wed, 15 Jul 2015 08:04:42 +0800
From: Yuyang Du <yuyang.du@...el.com>
To: mingo@...nel.org, peterz@...radead.org,
linux-kernel@...r.kernel.org
Cc: pjt@...gle.com, bsegall@...gle.com, morten.rasmussen@....com,
vincent.guittot@...aro.org, dietmar.eggemann@....com,
umgwanakikbuti@...il.com, len.brown@...el.com,
rafael.j.wysocki@...el.com, arjan@...ux.intel.com,
fengguang.wu@...el.com, Yuyang Du <yuyang.du@...el.com>
Subject: [PATCH v10 7/7] sched: Clean up load average references
For cfs_rq, we have load.weight, runnable_load_avg, and load_avg. We
now start to clean up how they are used.
First, as group sched_entity already largely uses load_avg, we now expand
to use load_avg in all cases. Second, for CPU-wide load balancing, we
choose to use runnable_load_avg in all cases, which is the same as before
this series.
Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
kernel/sched/fair.c | 44 +++++++++++++++++++++++++++++---------------
1 file changed, 29 insertions(+), 15 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a1bffe1..cd07138 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -690,6 +690,9 @@ void init_entity_runnable_average(struct sched_entity *se)
sa->util_sum = LOAD_AVG_MAX;
/* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */
}
+
+static inline unsigned long cfs_rq_runnable_load_avg(struct cfs_rq *cfs_rq);
+static inline unsigned long cfs_rq_load_avg(struct cfs_rq *cfs_rq);
#else
void init_entity_runnable_average(struct sched_entity *se)
{
@@ -2364,7 +2367,7 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
*/
tg_weight = atomic_long_read(&tg->load_avg);
tg_weight -= cfs_rq->tg_load_avg_contrib;
- tg_weight += cfs_rq->avg.load_avg;
+ tg_weight += cfs_rq_load_avg(cfs_rq);
return tg_weight;
}
@@ -2374,7 +2377,7 @@ static long calc_cfs_shares(struct cfs_rq *cfs_rq, struct task_group *tg)
long tg_weight, load, shares;
tg_weight = calc_tg_weight(tg, cfs_rq);
- load = cfs_rq->avg.load_avg;
+ load = cfs_rq_load_avg(cfs_rq);
shares = (tg->shares * load);
if (tg_weight)
@@ -2799,6 +2802,16 @@ 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;
+}
+
+static inline unsigned long cfs_rq_load_avg(struct cfs_rq *cfs_rq)
+{
+ return cfs_rq->avg.load_avg;
+}
+
static int idle_balance(struct rq *this_rq);
#else /* CONFIG_SMP */
@@ -4273,6 +4286,12 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
sched_avg_update(this_rq);
}
+/* Used instead of source_load when we know the type == 0 */
+static unsigned long weighted_cpuload(const int cpu)
+{
+ return cfs_rq_runnable_load_avg(&cpu_rq(cpu)->cfs);
+}
+
#ifdef CONFIG_NO_HZ_COMMON
/*
* There is no sane way to deal with nohz on smp when using jiffies because the
@@ -4294,7 +4313,7 @@ static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
static void update_idle_cpu_load(struct rq *this_rq)
{
unsigned long curr_jiffies = READ_ONCE(jiffies);
- unsigned long load = this_rq->cfs.avg.load_avg;
+ unsigned long load = weighted_cpuload(cpu_of(this_rq));
unsigned long pending_updates;
/*
@@ -4340,7 +4359,7 @@ void update_cpu_load_nohz(void)
*/
void update_cpu_load_active(struct rq *this_rq)
{
- unsigned long load = this_rq->cfs.avg.load_avg;
+ unsigned long load = weighted_cpuload(cpu_of(this_rq));
/*
* See the mess around update_idle_cpu_load() / update_cpu_load_nohz().
*/
@@ -4348,12 +4367,6 @@ void update_cpu_load_active(struct rq *this_rq)
__update_cpu_load(this_rq, load, 1);
}
-/* Used instead of source_load when we know the type == 0 */
-static unsigned long weighted_cpuload(const int cpu)
-{
- return cpu_rq(cpu)->cfs.avg.load_avg;
-}
-
/*
* Return a low guess at the load of a migration-source cpu weighted
* according to the scheduling class and "nice" value.
@@ -4401,7 +4414,7 @@ static unsigned long cpu_avg_load_per_task(int cpu)
{
struct rq *rq = cpu_rq(cpu);
unsigned long nr_running = READ_ONCE(rq->cfs.h_nr_running);
- unsigned long load_avg = rq->cfs.avg.load_avg;
+ unsigned long load_avg = weighted_cpuload(cpu);
if (nr_running)
return load_avg / nr_running;
@@ -4520,7 +4533,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg)
/*
* w = rw_i + @wl
*/
- w = se->my_q->avg.load_avg + wl;
+ w = cfs_rq_load_avg(se->my_q) + wl;
/*
* wl = S * s'_i; see (2)
@@ -5891,13 +5904,14 @@ static void update_cfs_rq_h_load(struct cfs_rq *cfs_rq)
}
if (!se) {
- cfs_rq->h_load = cfs_rq->avg.load_avg;
+ cfs_rq->h_load = cfs_rq_load_avg(cfs_rq);
cfs_rq->last_h_load_update = now;
}
while ((se = cfs_rq->h_load_next) != NULL) {
load = cfs_rq->h_load;
- load = div64_ul(load * se->avg.load_avg, cfs_rq->avg.load_avg + 1);
+ load = div64_ul(load * se->avg.load_avg,
+ cfs_rq_load_avg(cfs_rq) + 1);
cfs_rq = group_cfs_rq(se);
cfs_rq->h_load = load;
cfs_rq->last_h_load_update = now;
@@ -5910,7 +5924,7 @@ static unsigned long task_h_load(struct task_struct *p)
update_cfs_rq_h_load(cfs_rq);
return div64_ul(p->se.avg.load_avg * cfs_rq->h_load,
- cfs_rq->avg.load_avg + 1);
+ cfs_rq_load_avg(cfs_rq) + 1);
}
#else
static inline void update_blocked_averages(int cpu)
--
2.1.4
--
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