Commit 601b2185 authored by Ruchi Kandoi's avatar Ruchi Kandoi Committed by Rafael J. Wysocki
Browse files

cpufreq: trace frequency limits change 



systrace used for tracing for Android systems has carried a patch for
many years in the Android tree that traces when the cpufreq limits
change.  With the help of this information, systrace can know when the
policy limits change and can visually display the data. Lets add
upstream support for the same.

Signed-off-by: default avatarRuchi Kandoi <kandoiruchi@google.com>
Signed-off-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Acked-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 6e926363

Documentation/trace/events-power.rst

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ cpufreq. 


  cpu_idle		"state=%lu cpu_id=%lu"

  cpu_frequency		"state=%lu cpu_id=%lu"

  cpu_frequency_limits	"min=%lu max=%lu cpu_id=%lu"



A suspend event is used to indicate the system going in and out of the

suspend mode:

drivers/cpufreq/cpufreq.c

+1 −0
Original line number Diff line number Diff line
@@ -2236,6 +2236,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, 


	policy->min = new_policy->min;

	policy->max = new_policy->max;

	trace_cpu_frequency_limits(policy);



	policy->cached_target_freq = UINT_MAX;

include/trace/events/power.h

+25 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#if !defined(_TRACE_POWER_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_POWER_H



#include <linux/cpufreq.h>

#include <linux/ktime.h>

#include <linux/pm_qos.h>

#include <linux/tracepoint.h>
@@ -148,6 +149,30 @@ DEFINE_EVENT(cpu, cpu_frequency, 
	TP_ARGS(frequency, cpu_id)

);



TRACE_EVENT(cpu_frequency_limits,



	TP_PROTO(struct cpufreq_policy *policy),



	TP_ARGS(policy),



	TP_STRUCT__entry(

		__field(u32, min_freq)

		__field(u32, max_freq)

		__field(u32, cpu_id)

	),



	TP_fast_assign(

		__entry->min_freq = policy->min;

		__entry->max_freq = policy->max;

		__entry->cpu_id = policy->cpu;

	),



	TP_printk("min=%lu max=%lu cpu_id=%lu",

		  (unsigned long)__entry->min_freq,

		  (unsigned long)__entry->max_freq,

		  (unsigned long)__entry->cpu_id)

);



TRACE_EVENT(device_pm_callback_start,



	TP_PROTO(struct device *dev, const char *pm_ops, int event),

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