linux-kernel - Re: [PATCH v2 0/3] Add support for frequency invariance to AMD EPYC Zen2

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Date:   Tue, 10 Nov 2020 21:10:24 +0100
From:   Giovanni Gherdovich <ggherdovich@...e.cz>
To:     Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:     Jon Grimm <Jon.Grimm@....com>,
        Nathan Fontenot <Nathan.Fontenot@....com>,
        Yazen Ghannam <Yazen.Ghannam@....com>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pu Wen <puwen@...on.cn>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Doug Smythies <dsmythies@...us.net>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Add support for frequency invariance to AMD EPYC
 Zen2

On Tue, 2020-11-10 at 19:30 +0100, Giovanni Gherdovich wrote:
> v1 at https://lore.kernel.org/lkml/20201110083936.31994-1-ggherdovich@suse.cz/
> 
> Changes wrt v1:
> 
> - made initialization safe under CPU hotplug.
>   The function init_freq_invariance_cppc now lets only the first caller
>   into init_freq_invariance().
> 
> Giovanni Gherdovich (2):
>   x86, sched: Use midpoint of max_boost and max_P for frequency
>     invariance on AMD EPYC
>   x86: Print ratio freq_max/freq_base used in frequency invariance
>     calculations
> 
> Nathan Fontenot (1):
>   x86, sched: Calculate frequency invariance for AMD systems
> 
>  arch/x86/include/asm/topology.h |  8 ++++
>  arch/x86/kernel/smpboot.c       | 84 +++++++++++++++++++++++++++++++--
>  drivers/acpi/cppc_acpi.c        |  3 ++
>  3 files changed, 90 insertions(+), 5 deletions(-)
> 

Hello,

I've sent a V3 at
https://lore.kernel.org/lkml/20201110200519.18180-1-ggherdovich@suse.cz/
which is slightly better than this V2.

Please ignore V2, the V3 submission is the most up-to-date.
Sorry for the noise.


Giovanni