linux-kernel - Re: [RFC PATCH 00/10] arch/x86: AMD QoS support

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Date:   Wed, 3 Oct 2018 11:52:09 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Moger, Babu" <Babu.Moger@....com>
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "reinette.chatre@...el.com" <reinette.chatre@...el.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "pombredanne@...b.com" <pombredanne@...b.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kstewart@...uxfoundation.org" <kstewart@...uxfoundation.org>,
        "bp@...e.de" <bp@...e.de>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "xiaochen.shen@...el.com" <xiaochen.shen@...el.com>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "Hurwitz, Sherry" <sherry.hurwitz@....com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "dwmw@...zon.co.uk" <dwmw@...zon.co.uk>,
        "luto@...nel.org" <luto@...nel.org>,
        "jroedel@...e.de" <jroedel@...e.de>,
        "jannh@...gle.com" <jannh@...gle.com>,
        "dima@...sta.com" <dima@...sta.com>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        James Morse <james.morse@....com>
Subject: Re: [RFC PATCH 00/10] arch/x86: AMD QoS support

On Tue, Oct 02, 2018 at 07:16:23PM +0000, Moger, Babu wrote:
> 
> 
> On 10/02/2018 01:46 PM, Fenghua Yu wrote:
> > On Tue, Oct 02, 2018 at 05:44:47PM +0000, Moger, Babu wrote:
> >> Hi Fenghua,
> >>
> >>> -----Original Message-----
> >>> From: Fenghua Yu <fenghua.yu@...el.com>
> >>> Sent: Tuesday, October 2, 2018 12:07 PM
> >>> On Mon, Sep 24, 2018 at 07:18:54PM +0000, Moger, Babu wrote:
> >>>> The public specification is still in works. Will add the link when it is
> >>>> available.
> >>>
> >>> Is this the public AMD QoS spec?
> >>> https://support.amd.com/TechDocs/56375_Quality_of_Service_Extensions.
> >>> pdf
> >>>
> >>
> >> Yes. That is the one. 
> >> I was going to send the link after refreshing the patches on 4-19-rc5.  You already got it. Please let know if you have any feedback on the patches. 
> > 
> > I don't see the name 'RDT' (Resource Director Technology) in the
> > spec "AMD64 Technology Platform Quality of Service Extensions".
> > Does AMD use the same name 'RDT' as Intel?
> 
> No. AMD uses the word "Platform Quality of Service"(or in short QoS) to
> refer this feature.

Hi, Thomas, Babu, and James,

Can we use "resctrl" to replace "intel_rdt" and "rdt" in kernel? "resctrl"
is a neutral name and has been used in user interface already. Hopefully
"resctrl" can be acceptable by ARM, AMD, and Intel. We only use "intel_rdt",
"amd_qos", or "arm mpam" for vendor specific code.

Can we move all of Intel RDT, AMD QoS, and ARM MPAM code into a generic
place fs/resctrl where both ARM and X86 code can stay?
 
Thanks.

-Fenghua