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

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Date:   Wed, 13 May 2020 18:28:31 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     "Paul A. Clarke" <pc@...ibm.com>, linux-perf-users@...r.kernel.org
Cc:     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'

"Paul A. Clarke" <pc@...ibm.com> writes:
> From: "Paul A. Clarke" <pc@...ibm.com>
>
> 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?

cheers