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trace: cpufreq: Add tracing for min/max cpufreq

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Change-Id: I73f6ec437c1f805437d9376abb6510d1364b07ec
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
This commit is contained in:
Ruchi Kandoi 2015-11-19 16:07:19 -08:00 • committed by John Stultz
parent a2b15c0b53
commit 2665ab98e7
3 changed files with 27 additions and 0 deletions
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1
Documentation/trace/events-power.txt
View file

@ -25,6 +25,7 @@ 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

@ -2128,6 +2128,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
policy->min = new_policy->min;
policy->max = new_policy->max;
trace_cpu_frequency_limits(policy->max, policy->min, policy->cpu);
pr_debug("new min and max freqs are %u - %u kHz\n",
policy->min, policy->max);

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

@ -120,6 +120,31 @@ DEFINE_EVENT(cpu, cpu_frequency,
TP_ARGS(frequency, cpu_id)
);
TRACE_EVENT(cpu_frequency_limits,
TP_PROTO(unsigned int max_freq, unsigned int min_freq,
unsigned int cpu_id),
TP_ARGS(max_freq, min_freq, cpu_id),
TP_STRUCT__entry(
__field( u32, min_freq )
__field( u32, max_freq )
__field( u32, cpu_id )
),
TP_fast_assign(
__entry->min_freq = min_freq;
__entry->max_freq = min_freq;
__entry->cpu_id = cpu_id;
),
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),