linux-kernel - [RFC PATCH v3 2/5] cpuidle: Add Cpufreq Active Stats calls tracking idle entry/exit

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Date:   Wed,  6 Apr 2022 23:08:06 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org
Cc:     lukasz.luba@....com, dietmar.eggemann@....com,
        viresh.kumar@...aro.org, rafael@...nel.org,
        daniel.lezcano@...aro.org, amitk@...nel.org, rui.zhang@...el.com,
        amit.kachhap@...il.com, linux-pm@...r.kernel.org
Subject: [RFC PATCH v3 2/5] cpuidle: Add Cpufreq Active Stats calls tracking idle entry/exit

The Cpufreq Active Stats tracks and accounts the activity of the CPU
for each performance level. It accounts the real residency, when the CPU
was not idle, at a given performance level. This patch adds needed calls
which provide the CPU idle entry/exit events to the Cpufreq Active Stats.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 drivers/cpuidle/cpuidle.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index ef2ea1b12cd8..f19711b95afb 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -16,6 +16,7 @@
 #include <linux/notifier.h>
 #include <linux/pm_qos.h>
 #include <linux/cpu.h>
+#include <linux/cpufreq_stats.h>
 #include <linux/cpuidle.h>
 #include <linux/ktime.h>
 #include <linux/hrtimer.h>
@@ -231,6 +232,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
 	trace_cpu_idle(index, dev->cpu);
 	time_start = ns_to_ktime(local_clock());
 
+	cpufreq_active_stats_cpu_idle_enter(time_start);
+
 	stop_critical_timings();
 	if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
 		rcu_idle_enter();
@@ -243,6 +246,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
 	time_end = ns_to_ktime(local_clock());
 	trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
 
+	cpufreq_active_stats_cpu_idle_exit(time_end);
+
 	/* The cpu is no longer idle or about to enter idle. */
 	sched_idle_set_state(NULL);
 
-- 
2.17.1