linux-kernel - [PATCH] ANDROID: cpufreq: times: record fast switch frequency transitions

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Date:   Sat,  8 Oct 2022 20:16:37 +0800
From:   hongchengwen <hongchengwen@...o.com>
To:     hongchengwen@...o.com, rafael@...nel.org, viresh.kumar@...aro.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhengding chen <chenzhengding@...o.com>
Subject: [PATCH] ANDROID: cpufreq: times: record fast switch frequency transitions

From: zhengding chen <chenzhengding@...o.com>

cpufreq_times_record_transition() is not called when fast switch is
enabled, leading /proc/[pid]/time_in_state to attribute all time on a
cluster to a single frequency. To fix this, add a call to
cpufreq_times_record_transition() in the fast switch path.

Test: /proc/[pid]/time_in_state shows times for more than one freq per
cluster

Bug: 204726690
Signed-off-by: zhengding chen <chenzhengding@...o.com>
---
 drivers/cpufreq/cpufreq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 69b3d61..1caaf63 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2128,6 +2128,7 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
        arch_set_freq_scale(policy->related_cpus, freq,
                            policy->cpuinfo.max_freq);
        cpufreq_stats_record_transition(policy, freq);
+       cpufreq_times_record_transition(policy, freq);

        if (trace_cpu_frequency_enabled()) {
                for_each_cpu(cpu, policy->cpus)
--
2.7.4

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