linux-kernel - Re: [RFC PATCH v3 0/5] Introduce Cpufreq Active Stats

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Message-ID: <9eac86b6-0221-0f62-ac4f-f9e3b1613422@arm.com>
Date:   Tue, 26 Apr 2022 08:59:33 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        rafael@...nel.org, daniel.lezcano@...aro.org, amitk@...nel.org,
        rui.zhang@...el.com, amit.kachhap@...il.com,
        linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH v3 0/5] Introduce Cpufreq Active Stats



On 4/26/22 08:54, Viresh Kumar wrote:
> On 26-04-22, 08:46, Lukasz Luba wrote:
>> I haven't modify your current cpufreq stats, they are still counting
>> total time (idle + running) for the given frequency. I think this is
>> still useful for some userspace tools. These new proposed stats don't
>> have such sysfs interface to read them. I don't know if userspace would
>> be interested in this information (the running only time). IIRC Android
>> uses bpf mechanisms to get this information to the userspace.
> 
> I saw some debugfs bits there, aren't you exposing any data via it ? I
> am just asking about, not suggesting :)
> 

:) but I didn't dare to make it sysfs. I don't know if anything in
user-space would be interested (apart from my test scripts).