linux-kernel - Re: [PATCH v3 3/3] Documentation: intel_pstate: Add base

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Date:   Mon, 15 Oct 2018 10:53:25 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     Jonathan Corbet <corbet@....net>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Robert Moore <robert.moore@...el.com>,
        "Schmauss, Erik" <erik.schmauss@...el.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>, devel@...ica.org,
        Prashanth Prakash <pprakash@...eaurora.org>,
        George Cherian <george.cherian@...ium.com>
Subject: Re: [PATCH v3 3/3] Documentation: intel_pstate: Add base_frequency information

On Fri, Oct 12, 2018 at 6:44 PM Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> Updated documentation to explain base_frequency attribute.
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
>  Documentation/admin-guide/pm/intel_pstate.rst | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/admin-guide/pm/intel_pstate.rst b/Documentation/admin-guide/pm/intel_pstate.rst
> index 8f1d3de449b5..14a5505e073e 100644
> --- a/Documentation/admin-guide/pm/intel_pstate.rst
> +++ b/Documentation/admin-guide/pm/intel_pstate.rst
> @@ -465,6 +465,10 @@ Next, the following policy attributes have special meaning if
>         policy for the time interval between the last two invocations of the
>         driver's utilization update callback by the CPU scheduler for that CPU.
>
> +``base_frequency``
> +       When present, shows the base frequency of the CPU. Any frequency above
> +       this will be in the turbo frequency range.
> +

This isn't entirely correct, because base_frequency is not present in
the passive mode (and it is not present for the other drivers for that
matter).

>  The meaning of these attributes in the `passive mode <Passive Mode_>`_ is the
>  same as for other scaling drivers.

Instead, I would say:

"One more policy attribute is present if the `HWP feature is enabled
in the processor <Active Mode With HWP_>`_:"

here and I would add the description of the attribute below.

Thanks,
Rafael