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From: Douglas RAILLARD <douglas.raillard@arm.com>
To: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org, mingo@redhat.com, peterz@infradead.org,
	rjw@rjwysocki.net, viresh.kumar@linaro.org,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	douglas.raillard@arm.com, dietmar.eggemann@arm.com,
	qperret@qperret.net, patrick.bellasi@matbug.net,
	dh.han@samsung.com
Subject: [RFC PATCH v3 6/6] sched/cpufreq: Add schedutil_em_tp tracepoint
Date: Fri, 11 Oct 2019 14:45:00 +0100
Message-ID: <20191011134500.235736-7-douglas.raillard@arm.com> (raw)
In-Reply-To: <20191011134500.235736-1-douglas.raillard@arm.com>

Introduce a new tracepoint reporting the effect of using the Energy
Model inside get_next_freq() in schedutil.

Signed-off-by: Douglas RAILLARD <douglas.raillard@arm.com>
---
 include/trace/events/power.h     |  9 +++++++++
 kernel/sched/cpufreq_schedutil.c | 20 ++++++++++++++------
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index f7aece721aed..87a14f5208a7 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -529,6 +529,15 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request,
 
 	TP_ARGS(name, type, new_value)
 );
+
+DECLARE_TRACE(schedutil_em_tp,
+	TP_PROTO(unsigned int cpu, unsigned long util,
+		unsigned int cost_margin, unsigned int policy_cost_margin,
+		unsigned int base_freq, unsigned int boosted_freq),
+	TP_ARGS(cpu, util, cost_margin, policy_cost_margin, base_freq,
+		boosted_freq)
+);
+
 #endif /* _TRACE_POWER_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 7c1a749fb6ef..076bbb69ff42 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -14,6 +14,8 @@
 #include <linux/sched/cpufreq.h>
 #include <trace/events/power.h>
 
+EXPORT_TRACEPOINT_SYMBOL_GPL(schedutil_em_tp);
+
 #define IOWAIT_BOOST_MIN	(SCHED_CAPACITY_SCALE / 8)
 
 struct sugov_tunables {
@@ -223,7 +225,7 @@ static unsigned long sugov_cpu_ramp_boost_update(struct sugov_cpu *sg_cpu)
 
 /**
  * get_next_freq - Compute a new frequency for a given cpufreq policy.
- * @sg_policy: schedutil policy object to compute the new frequency for.
+ * @sg_cpu: schedutil CPU object to compute the new frequency for.
  * @util: Current CPU utilization.
  * @max: CPU capacity.
  * @boost: Extra power that can be spent on top of the minimum amount of power
@@ -246,22 +248,28 @@ static unsigned long sugov_cpu_ramp_boost_update(struct sugov_cpu *sg_cpu)
  * next_freq (as calculated above) is returned, subject to policy min/max and
  * cpufreq driver limitations.
  */
-static unsigned int get_next_freq(struct sugov_policy *sg_policy,
+static unsigned int get_next_freq(struct sugov_cpu *sg_cpu,
 				  unsigned long util, unsigned long max,
 				  unsigned long boost)
 {
+	struct sugov_policy *sg_policy = sg_cpu->sg_policy;
 	struct cpufreq_policy *policy = sg_policy->policy;
 	unsigned int freq = arch_scale_freq_invariant() ?
 				policy->cpuinfo.max_freq : policy->cur;
 	struct em_perf_domain *pd = sugov_policy_get_pd(sg_policy);
+	unsigned int base_freq;
 
-	freq = map_util_freq(util, freq, max);
+	base_freq = map_util_freq(util, freq, max);
 
 	/*
 	 * Try to get a higher frequency if one is available, given the extra
 	 * power we are ready to spend.
 	 */
-	freq = em_pd_get_higher_freq(pd, freq, boost);
+	freq = em_pd_get_higher_freq(pd, base_freq, boost);
+
+	trace_schedutil_em_tp(sg_cpu->cpu, util,
+				 sugov_cpu_ramp_boost(sg_cpu), boost,
+				 base_freq, freq);
 
 	if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
 		return sg_policy->next_freq;
@@ -560,7 +568,7 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
 	ramp_boost = sugov_cpu_ramp_boost_update(sg_cpu);
 	max = sg_cpu->max;
 	util = sugov_iowait_apply(sg_cpu, time, util, max);
-	next_f = get_next_freq(sg_policy, util, max, ramp_boost);
+	next_f = get_next_freq(sg_cpu, util, max, ramp_boost);
 	/*
 	 * Do not reduce the frequency if the CPU has not been idle
 	 * recently, as the reduction is likely to be premature then.
@@ -616,7 +624,7 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
 	}
 
 
-	return get_next_freq(sg_policy, util, max, ramp_boost);
+	return get_next_freq(sg_cpu, util, max, ramp_boost);
 }
 
 static void
-- 
2.23.0


  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11 13:44 [RFC PATCH v3 0/6] sched/cpufreq: Make schedutil energy aware Douglas RAILLARD
2019-10-11 13:44 ` [RFC PATCH v3 1/6] PM: Introduce em_pd_get_higher_freq() Douglas RAILLARD
2019-10-17  8:57   ` Dietmar Eggemann
2019-10-17  9:58   ` Dietmar Eggemann
2019-10-17 11:09     ` Douglas Raillard
2019-10-11 13:44 ` [RFC PATCH v3 2/6] sched/cpufreq: Attach perf domain to sugov policy Douglas RAILLARD
2019-10-17  8:57   ` Dietmar Eggemann
2019-10-17 10:22     ` Douglas Raillard
2019-10-11 13:44 ` [RFC PATCH v3 3/6] sched/cpufreq: Hook em_pd_get_higher_power() into get_next_freq() Douglas RAILLARD
2019-10-11 13:44 ` [RFC PATCH v3 4/6] sched/cpufreq: Introduce sugov_cpu_ramp_boost Douglas RAILLARD
2019-10-14 14:33   ` Peter Zijlstra
2019-10-14 15:32     ` Douglas Raillard
2019-10-17  8:57   ` Dietmar Eggemann
2019-10-17 11:19     ` Douglas Raillard
2019-10-11 13:44 ` [RFC PATCH v3 5/6] sched/cpufreq: Boost schedutil frequency ramp up Douglas RAILLARD
2019-10-17  9:21   ` Dietmar Eggemann
2019-10-11 13:45 ` Douglas RAILLARD [this message]
2019-10-14 14:53 ` [RFC PATCH v3 0/6] sched/cpufreq: Make schedutil energy aware Peter Zijlstra
2019-10-14 15:50   ` Douglas Raillard
2019-10-17  9:50     ` Peter Zijlstra
2019-10-17 11:11       ` Quentin Perret
2019-10-17 14:11         ` Peter Zijlstra
2019-10-18  7:44           ` Dietmar Eggemann
2019-10-18  7:59             ` Peter Zijlstra
2019-10-18 17:24               ` Douglas Raillard
2019-10-18  8:11             ` Peter Zijlstra
2019-10-17 14:23       ` Douglas Raillard
2019-10-17 14:53         ` Peter Zijlstra
2019-10-17 19:07         ` Peter Zijlstra
2019-10-18 11:46           ` Douglas Raillard
2019-10-18 12:07             ` Peter Zijlstra
2019-10-18 14:44               ` Douglas Raillard
2019-10-18 15:15                 ` Vincent Guittot
2019-10-18 16:03                   ` Douglas Raillard
2019-10-18 15:20                 ` Vincent Guittot

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