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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: Ruchi Kandoi <kandoiruchi@google.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ruchi Kandoi 2018-07-24 10:35:44 -07:00 committed by Rafael J. Wysocki
parent 6e926363fc
commit 601b218568
3 changed files with 27 additions and 0 deletions
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1
Documentation/trace/events-power.rst
View File

@ -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:

1
drivers/cpufreq/cpufreq.c
View File

@ -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;

25
include/trace/events/power.h
View File

@ -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),