linux-kernel - Re: [PATCH V2 1/6] perf/x86/intel: Add Grand Ridge and Sierra Forest

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Date:   Thu, 8 Jun 2023 09:24:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     "kan.liang@...ux.intel.com" <kan.liang@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "irogers@...gle.com" <irogers@...gle.com>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Eranian, Stephane" <eranian@...gle.com>,
        "alexey.v.bayduraev@...ux.intel.com" 
        <alexey.v.bayduraev@...ux.intel.com>,
        "Zhang, Tinghao" <tinghao.zhang@...el.com>
Subject: Re: [PATCH V2 1/6] perf/x86/intel: Add Grand Ridge and Sierra Forest

On Wed, Jun 07, 2023 at 09:43:57PM +0000, Luck, Tony wrote:
> > > Create a non-hybrid PMU setup for Grand Ridge and Sierra Forest.
> >
> > Moo... Tony, did you sneak product names instead of uarch names in the
> > intel-family thing again?
> >
> > That is; I'm thinking we want the below, no?
> >
> > -#define INTEL_FAM6_SIERRAFOREST_X    0xAF
> > -
> > -#define INTEL_FAM6_GRANDRIDGE                0xB6
> > +#define INTEL_FAM6_ATOM_CRESTMONT_X  0xAF /* Sierra Forest */
> > +#define INTEL_FAM6_ATOM_CRESTMONT    0xB6 /* Grand Ridge */
> 
> I don't think that's really any more helpful.

Well, it clearly shows why these two are grouped together. They are the
same bloody uarch. OTOH 'Sierra Forest' and 'Grand Ridge' is just random
gibberish that nobody can relate without looking up some website.

> Using the code name of the model makes it easy to look things
> up in ark.intel.com. Using the "core" name doesn't even work for
> hybrid CPU models which have more than one core type.
> So I'd like to keep it as it is.

ark.intel.com is a travesty anyway... if I get it as a result to a
Google query I will almost always avoid it because it is not useful.

Wikipedia and Wikichip are by far more useful.

> But if you want to change to the core name, then please just
> do it now.
> 
> There are folks internally worried that all upstream work for
> these two CPU models is going to be blocked while this
> is discussed.

Then I'm hoping their take-away is that random gibberish names don't
help anybody. The whole Intel naming scheme is impenetrable crap.