linux-kernel - Re: [PATCH 2/4] perf vendor events arm64: AmpereOne: Mark affected STALL

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Date:   Fri, 4 Aug 2023 12:05:15 +0100
From:   John Garry <john.g.garry@...cle.com>
To:     Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Will Deacon <will@...nel.org>, James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org,
        Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: Re: [PATCH 2/4] perf vendor events arm64: AmpereOne: Mark affected
 STALL_* events impacted by errata

On 03/08/2023 22:13, Ilkka Koskinen wrote:
> Per errata AC03_CPU_29, STALL_SLOT_FRONTEND, STALL_FRONTEND, and STALL
> events are not counting as expected. The follow up metrics patch will
> include correct way to calculate the impacted events.
> 
> Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>

Reviewed-by: John Garry <john.g.garry@...cle.com>

> ---
>   .../arch/arm64/ampere/ampereone/pipeline.json        | 12 +++++++++---
>   1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/arch/arm64/ampere/ampereone/pipeline.json b/tools/perf/pmu-events/arch/arm64/ampere/ampereone/pipeline.json
> index f9fae15f7555..711028377f3e 100644
> --- a/tools/perf/pmu-events/arch/arm64/ampere/ampereone/pipeline.json
> +++ b/tools/perf/pmu-events/arch/arm64/ampere/ampereone/pipeline.json
> @@ -1,18 +1,24 @@
>   [
>       {
> -        "ArchStdEvent": "STALL_FRONTEND"
> +        "ArchStdEvent": "STALL_FRONTEND",
> +        "Errata": "Errata AC03_CPU_29",
> +        "BriefDescription": "Impacted by errata, use metrics instead -"

why end with a '-'?

>       },
>       {
>           "ArchStdEvent": "STALL_BACKEND"
>       },
>       {
> -        "ArchStdEvent": "STALL"
> +        "ArchStdEvent": "STALL",
> +        "Errata": "Errata AC03_CPU_29",
> +        "BriefDescription": "Impacted by errata, use metrics instead -"
>       },
>       {
>           "ArchStdEvent": "STALL_SLOT_BACKEND"
>       },
>       {
> -        "ArchStdEvent": "STALL_SLOT_FRONTEND"
> +        "ArchStdEvent": "STALL_SLOT_FRONTEND",
> +        "Errata": "Errata AC03_CPU_29",
> +        "BriefDescription": "Impacted by errata, use metrics instead -"
>       },
>       {
>           "ArchStdEvent": "STALL_SLOT"