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

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Date:   Wed, 22 Sep 2021 14:47:05 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Sharma, Deepak" <deesharm@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Deepak Sharma <deepak.sharma@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:SUSPEND TO RAM" <linux-pm@...r.kernel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/ACPI/State: Optimize C3 entry on AMD CPUs

On Wed, Sep 22, 2021 at 5:50 AM Sharma, Deepak <deesharm@....com> wrote:
>
> Hi Rafael,
>
> On 9/1/2021 5:45 AM, Rafael J. Wysocki wrote:
> > On Wed, Sep 1, 2021 at 4:14 AM Deepak Sharma <deesharm@....com> wrote:
> >>
> >> On 8/25/21 11:07 AM, Rafael J. Wysocki wrote:
> >>> On Thu, Aug 19, 2021 at 2:43 AM Deepak Sharma <deepak.sharma@....com> wrote:
> >>>> AMD CPU which support C3 shares cache. Its not necessary to flush the
> >>>> caches in software before entering C3. This will cause performance drop
> >>>> 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>
> >>> Applied as 5.15 material under the edited subject "x86: ACPI: cstate:
> >>> Optimize C3 entry on AMD CPUs", thanks!
> >> I might need to send subsequent patch for this. Can you please point me
> >> to git and branch where this has been merged.
> > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
>
> Still I am not able to see this patch merged on linux-next branch.

It was there, but got dropped before the merge window due to the
unclear next steps.

I'd rather see this resent along with the subsequent patch you were
talking about.