From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle
Date: Fri, 1 Apr 2016 02:08:31 +0200
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To: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>, =?UTF-8?Q?J=C3=B6rg_Otte?= <jrg.otte@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>, "Rafael J. Wysocki" <rafael@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux PM list <linux-pm@vger.kernel.org>, Doug Smythies <dsmythies@telus.net>

On Thu, Mar 31, 2016 at 7:55 PM, Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> wrote:
> On Thu, 2016-03-31 at 19:27 +0200, J=C3=B6rg Otte wrote:
>> 2016-03-31 17:43 GMT+02:00 Rafael J. Wysocki <rjw@rjwysocki.net>:
>> > On Thursday, March 31, 2016 05:25:18 PM J=C3=B6rg Otte wrote:
>> > > 2016-03-31 13:42 GMT+02:00 Rafael J. Wysocki <rjw@rjwysocki.net>=
:
>> > > > On Thursday, March 31, 2016 11:05:56 AM J=C3=B6rg Otte wrote:
>> > > >

[cut]

>>
>> OK, patch is applied.
>> After some configurations and compilations I'm there.
>> Under pstate_sample I see:
>> enable  filter  format  id  trigger
>>
>> what to do now ? (never did tracing before)'
>
> # cd /sys/kernel/debug/tracing/
> # echo 1 > events/power/pstate_sample/enable
> # echo 1 > events/power/cpu_frequency/enable
> # cat trace
> Send us the trace file.

Here's what I do, for completeness:

# echo 0 > /sys/kernel/debug/tracing/tracing_on
# echo global > /sys/kernel/debug/tracing/trace_clock
# echo nop > /sys/kernel/debug/tracing/current_tracer
# echo 1000 > /sys/kernel/debug/tracing/buffer_size_kb
# echo 1 > /sys/kernel/debug/tracing/events/power/pstate_sample/enable
# echo "" > /sys/kernel/debug/tracing/trace
# echo 1 > /sys/kernel/debug/tracing/tracing_on

Then, (after a while) make a copy of the trace file.