linux-kernel - Re: [RESEND PATCH] x86: ACPI: cstate: Optimize C3 entry on AMD CPUs

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Message-ID: <CAJZ5v0ggnbFvpcmKpemF9Kt9hTGNEDHr+zeXhW+yNqz9KSeZsg@mail.gmail.com>
Date:   Fri, 1 Oct 2021 20:46:17 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Deepak Sharma <deepak.sharma@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [RESEND PATCH] x86: ACPI: cstate: Optimize C3 entry on AMD CPUs

On Sun, Sep 26, 2021 at 5:13 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Fri, Sep 24 2021 at 18:48, Rafael J. Wysocki wrote:
>
> > On Fri, Sep 24, 2021 at 8:12 AM Deepak Sharma <deepak.sharma@....com> wrote:
> >>
> >> All Zen or newer CPU which support C3 shares cache. Its not necessary to
> >> flush the caches in software before entering C3. This will cause drop in
> >> performance for the cores which share some caches. ARB_DIS is not used
> >> with current AMD C state implementation. So set related flags correctly.
> >>
> >> Signed-off-by: Deepak Sharma <deepak.sharma@....com>
> >
> > I'm planning to take this one unless the x86 maintainers have concerns, thanks.
>
> Acked-by: Thomas Gleixner <tglx@...utronix.de>

Thanks!

Applied as 5.16 material, thanks!