From 601b218568a107370086dc5c7a1b283f8d463268 Mon Sep 17 00:00:00 2001 From: Ruchi Kandoi Date: Tue, 24 Jul 2018 10:35:44 -0700 Subject: [PATCH] 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 Signed-off-by: Joel Fernandes (Google) Acked-by: Viresh Kumar Acked-by: Steven Rostedt (VMware) Signed-off-by: Rafael J. Wysocki --- Documentation/trace/events-power.rst | 1 + drivers/cpufreq/cpufreq.c | 1 + include/trace/events/power.h | 25 +++++++++++++++++++++++++ 3 files changed, 27 insertions(+) diff --git a/Documentation/trace/events-power.rst b/Documentation/trace/events-power.rst index a77daca75e30..2ef318962e29 100644 --- a/Documentation/trace/events-power.rst +++ b/Documentation/trace/events-power.rst @@ -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: diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index b0dfd3222013..52566f1f1050 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -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; diff --git a/include/trace/events/power.h b/include/trace/events/power.h index 908977d69783..f7aece721aed 100644 --- a/include/trace/events/power.h +++ b/include/trace/events/power.h @@ -5,6 +5,7 @@ #if !defined(_TRACE_POWER_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_POWER_H +#include #include #include #include @@ -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), -- GitLab