[PATCH 08/11] sched: schedutil: remove sugov_aggregate_util()

[Vincent Guittot]

There is no reason why sugov_get_util() and sugov_aggregate_util()
were in fact separate functions.

Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
[rebased after adding irq tracking and fixed some compilation errors]
Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---
 kernel/sched/cpufreq_schedutil.c | 44 ++++++++++++++--------------------------
 kernel/sched/sched.h             |  2 +-
 2 files changed, 16 insertions(+), 30 deletions(-)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index b77bfef..d04f941 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -53,12 +53,7 @@ struct sugov_cpu {
 	unsigned int		iowait_boost_max;
 	u64			last_update;
 
-	/* The fields below are only needed when sharing a policy: */
-	unsigned long		util_cfs;
-	unsigned long		util_dl;
 	unsigned long		bw_dl;
-	unsigned long		util_rt;
-	unsigned long		util_irq;
 	unsigned long		max;
 
 	/* The field below is for single-CPU policies only: */
@@ -182,38 +177,31 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
 	return cpufreq_driver_resolve_freq(policy, freq);
 }
 
-static void sugov_get_util(struct sugov_cpu *sg_cpu)
+static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
 {
 	struct rq *rq = cpu_rq(sg_cpu->cpu);
+	unsigned long util, irq, max;
 
-	sg_cpu->max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
-	sg_cpu->util_cfs = cpu_util_cfs(rq);
-	sg_cpu->util_dl  = cpu_util_dl(rq);
-	sg_cpu->bw_dl    = cpu_bw_dl(rq);
-	sg_cpu->util_rt  = cpu_util_rt(rq);
-	sg_cpu->util_irq = cpu_util_irq(rq);
-}
-
-static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
-{
-	struct rq *rq = cpu_rq(sg_cpu->cpu);
-	unsigned long util, max = sg_cpu->max;
+	sg_cpu->max = max = arch_scale_cpu_capacity(NULL, sg_cpu->cpu);
+	sg_cpu->bw_dl = cpu_bw_dl(rq);
 
 	if (rq->rt.rt_nr_running)
-		return sg_cpu->max;
+		return max;
+
+	irq = cpu_util_irq(rq);
 
-	if (unlikely(sg_cpu->util_irq >= max))
+	if (unlikely(irq >= max))
 		return max;
 
 	/* Sum rq utilization */
-	util = sg_cpu->util_cfs;
-	util += sg_cpu->util_rt;
+	util = cpu_util_cfs(rq);
+	util += cpu_util_rt(rq);
 
 	/*
 	 * Interrupt time is not seen by rqs utilization nso we can compare
 	 * them with the CPU capacity
 	 */
-	if ((util + sg_cpu->util_dl) >= max)
+	if ((util + cpu_util_dl(rq)) >= max)
 		return max;
 
 	/*
@@ -231,11 +219,11 @@ static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
 	 */
 
 	/* Weight rqs utilization to normal context window */
-	util *= (max - sg_cpu->util_irq);
+	util *= (max - irq);
 	util /= max;
 
 	/* Add interrupt utilization */
-	util += sg_cpu->util_irq;
+	util += irq;
 
 	/* Add DL bandwidth requirement */
 	util += sg_cpu->bw_dl;
@@ -418,9 +406,8 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
 
 	busy = sugov_cpu_is_busy(sg_cpu);
 
-	sugov_get_util(sg_cpu);
+	util = sugov_get_util(sg_cpu);
 	max = sg_cpu->max;
-	util = sugov_aggregate_util(sg_cpu);
 	sugov_iowait_apply(sg_cpu, time, &util, &max);
 	next_f = get_next_freq(sg_policy, util, max);
 	/*
@@ -459,9 +446,8 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
 		struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
 		unsigned long j_util, j_max;
 
-		sugov_get_util(j_sg_cpu);
+		j_util = sugov_get_util(j_sg_cpu);
 		j_max = j_sg_cpu->max;
-		j_util = sugov_aggregate_util(j_sg_cpu);
 		sugov_iowait_apply(j_sg_cpu, time, &j_util, &j_max);
 
 		if (j_util * max > j_max * util) {
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 9438e68..59a633d 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2219,7 +2219,7 @@ static inline unsigned long cpu_util_cfs(struct rq *rq)
 
 static inline unsigned long cpu_util_rt(struct rq *rq)
 {
-	return rq->avg_rt.util_avg;
+	return READ_ONCE(rq->avg_rt.util_avg);
 }
 
 #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING)
-- 
2.7.4