linux-kernel - Re: [PATCH] perf vendor events power10: Add metric events json file for power10 platform

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Date:   Fri, 08 Oct 2021 16:58:52 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Segher Boessenkool <segher@...nel.crashing.org>,
        "Paul A. Clarke" <pc@...ibm.com>
Cc:     Kajol Jain <kjain@...ux.ibm.com>, maddy@...ux.vnet.ibm.com,
        rnsastry@...ux.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, acme@...nel.org,
        linux-perf-users@...r.kernel.org, atrajeev@...ux.vnet.ibm.com,
        jolsa@...hat.com
Subject: Re: [PATCH] perf vendor events power10: Add metric events json file
 for power10 platform

Segher Boessenkool <segher@...nel.crashing.org> writes:
> On Thu, Oct 07, 2021 at 08:47:50AM -0500, Paul A. Clarke wrote:
>> On Wed, Oct 06, 2021 at 12:32:48PM -0500, Paul A. Clarke wrote:
>> > > +    {
>> > > +        "BriefDescription": "Average cycles per instruction when the instruction finishes at dispatch",
>> > 
>> > I'm not sure what that means.
>> 
>> After doing a bit of research, I think it might be a bit more clear as:
>> "Average cycles per instruction when the NTF instruction finishes at dispatch"
>
> Is "next to finish" some defined and/or sensible term in this context?
> Or do you mean NTC here?  Or what :-)

Yeah I am also more familiar with NTC.

But those descriptions originally come from a spreadsheet we're given,
and they do include NTF as an acronym.

eg. search for NTF in here:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/pmu-events/arch/powerpc/power9/metrics.json

>From the context it does presumably mean "next to finish".

cheers