cpufreq: conservative: call dbs_check_cpu only when necessary

Modify conservative timer to not resample CPU utilization if recently
sampled from another SW coordinated core.
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/cpufreq_conservative.c

@@ -111,22 +111,57 @@ static void cs_check_cpu(int cpu, unsigned int load)
 	}
 }
 
-static void cs_dbs_timer(struct work_struct *work)
+static void cs_timer_update(struct cs_cpu_dbs_info_s *dbs_info, bool sample,
+			    struct delayed_work *dw)
 {
-	struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
-			struct cs_cpu_dbs_info_s, cdbs.work.work);
 	unsigned int cpu = dbs_info->cdbs.cpu;
 	int delay = delay_for_sampling_rate(cs_tuners.sampling_rate);
 
+	if (sample)
+		dbs_check_cpu(&cs_dbs_data, cpu);
+
+	schedule_delayed_work_on(smp_processor_id(), dw, delay);
+}
+
+static void cs_timer_coordinated(struct cs_cpu_dbs_info_s *dbs_info_local,
+				 struct delayed_work *dw)
+{
+	struct cs_cpu_dbs_info_s *dbs_info;
+	ktime_t time_now;
+	s64 delta_us;
+	bool sample = true;
+
+	/* use leader CPU's dbs_info */
+	dbs_info = &per_cpu(cs_cpu_dbs_info, dbs_info_local->cdbs.cpu);
 	mutex_lock(&dbs_info->cdbs.timer_mutex);
 
-	dbs_check_cpu(&cs_dbs_data, cpu);
+	time_now = ktime_get();
+	delta_us = ktime_us_delta(time_now, dbs_info->cdbs.time_stamp);
 
-	schedule_delayed_work_on(smp_processor_id(), &dbs_info->cdbs.work,
-			delay);
+	/* Do nothing if we recently have sampled */
+	if (delta_us < (s64)(cs_tuners.sampling_rate / 2))
+		sample = false;
+	else
+		dbs_info->cdbs.time_stamp = time_now;
+
+	cs_timer_update(dbs_info, sample, dw);
 	mutex_unlock(&dbs_info->cdbs.timer_mutex);
 }
 
+static void cs_dbs_timer(struct work_struct *work)
+{
+	struct delayed_work *dw = to_delayed_work(work);
+	struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
+			struct cs_cpu_dbs_info_s, cdbs.work.work);
+
+	if (dbs_sw_coordinated_cpus(&dbs_info->cdbs)) {
+		cs_timer_coordinated(dbs_info, dw);
+	} else {
+		mutex_lock(&dbs_info->cdbs.timer_mutex);
+		cs_timer_update(dbs_info, true, dw);
+		mutex_unlock(&dbs_info->cdbs.timer_mutex);
+	}
+}
 static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 		void *data)
 {