linux-kernel - Re: [PATCH 2/2] perf: Add missing metrics to POWER9 'cpi

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Date:   Thu, 14 May 2020 16:04:25 -0500
From:   "Paul A. Clarke" <pc@...ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        acme@...nel.org, ananth@...ux.vnet.ibm.com,
        maddy@...ux.vnet.ibm.com, naveen.n.rao@...ux.vnet.ibm.com,
        sukadev@...ux.ibm.com, irogers@...gle.com
Subject: Re: [PATCH 2/2] perf: Add missing metrics to POWER9 'cpi_breakdown'

On Wed, May 13, 2020 at 06:28:31PM +1000, Michael Ellerman wrote:
> "Paul A. Clarke" <pc@...ibm.com> writes:
> > Add the following metrics to the POWER9 'cpi_breakdown' metricgroup:
> > - ict_noslot_br_mpred_cpi
> > - ict_noslot_br_mpred_icmiss_cpi
> > - ict_noslot_cyc_other_cpi
> > - ict_noslot_disp_held_cpi
> > - ict_noslot_disp_held_hb_full_cpi
> > - ict_noslot_disp_held_issq_cpi
> > - ict_noslot_disp_held_other_cpi
> > - ict_noslot_disp_held_sync_cpi
> > - ict_noslot_disp_held_tbegin_cpi
> > - ict_noslot_ic_l2_cpi
> > - ict_noslot_ic_l3_cpi
> > - ict_noslot_ic_l3miss_cpi
> > - ict_noslot_ic_miss_cpi
> >
> > Signed-off-by: Paul A. Clarke <pc@...ibm.com>
> > ---
> >  .../arch/powerpc/power9/metrics.json          | 143 ++++++++++--------
> >  1 file changed, 78 insertions(+), 65 deletions(-)
> >
> > diff --git a/tools/perf/pmu-events/arch/powerpc/power9/metrics.json b/tools/perf/pmu-events/arch/powerpc/power9/metrics.json
> > index 811c2a8c1c9e..6169351a72c8 100644
> > --- a/tools/perf/pmu-events/arch/powerpc/power9/metrics.json
> > +++ b/tools/perf/pmu-events/arch/powerpc/power9/metrics.json
> > @@ -207,6 +207,84 @@
> >          "MetricGroup": "cpi_breakdown",
> >          "MetricName": "fxu_stall_cpi"
> >      },
> > +    {
> > +        "BriefDescription": "Ict empty for this thread due to branch mispred",
> 
> I think you're just moving this, not adding it. But ICT is an acronym,
> so it should be spelled ICT not Ict.
> 
> It might be worth expanding it too?

This was 98% produced through automated means, translating an existing
XML file to perf's JSON format.

I've gotten the upstream XML file changed to include the "ICT" metrics
in the "cpi_breakdown" group already, and can request the changes you
suggest also be incorporated.

For the time being, can we move forward with the patch as-is?

PC