linux-kernel - Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD P-State module

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Date:   Tue, 1 Mar 2022 17:07:45 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Doug Smythies <dsmythies@...us.net>,
        "Huang, Ray" <Ray.Huang@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Todd Brandt <todd.e.brandt@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Yuan, Perry" <Perry.Yuan@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>
Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD
 P-State module

On Tue, Mar 1, 2022 at 5:05 PM Deucher, Alexander
<Alexander.Deucher@....com> wrote:
>
> [AMD Official Use Only]
>
> > -----Original Message-----
> > From: Rafael J. Wysocki <rafael@...nel.org>
> > Sent: Tuesday, March 1, 2022 10:26 AM
> > To: Su, Jinzhou (Joe) <Jinzhou.Su@....com>
> > Cc: Rafael J. Wysocki <rjw@...ysocki.net>; Linux PM <linux-
> > pm@...r.kernel.org>; Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com>; Doug Smythies
> > <dsmythies@...us.net>; Huang, Ray <Ray.Huang@....com>; Viresh Kumar
> > <viresh.kumar@...aro.org>; Todd Brandt <todd.e.brandt@...ux.intel.com>;
> > Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; Sharma, Deepak
> > <Deepak.Sharma@....com>; Deucher, Alexander
> > <Alexander.Deucher@....com>; Du, Xiaojian <Xiaojian.Du@....com>;
> > Yuan, Perry <Perry.Yuan@....com>; Meng, Li (Jassmine)
> > <Li.Meng@....com>
> > Subject: Re: [PATCH 1/3] cpufreq: amd-pstate: Add more tracepoint for AMD
> > P-State module
> >
> > On Wed, Feb 23, 2022 at 11:04 AM Jinzhou Su <Jinzhou.Su@....com>
> > wrote:
> > >
> > > Add frequency, mperf, aperf and tsc in the trace. This can be used to
> > > debug and tune the performance of AMD P-state driver.
> > >
> > > Use the time difference between amd_pstate_update to calculate CPU
> > > frequency. There could be sleep in arch_freq_get_on_cpu, so do not use
> > > it here.
> > >
> > > Signed-off-by: Jinzhou Su <Jinzhou.Su@....com>
> > > Signed-off-by: Huang Rui <ray.huang@....com>
> >
> > I'm not sure what the second sign-off is for.
> >
> > If this is a maintainer's sign-off, it should be added by the maintainer himself
> > and you should not add it when submitting the patch.
>
> Both developers co-worked on the patch.  Isn't that pretty standard when you rework someone else's patch?

It is, but that's when Co-developed-by should be used.  Otherwise the
meaning of the second s-o-b is unclear.