linux-kernel - Re: [PATCH 1/2] perf vendor events arm64: AmpereOne/AmpereOneX: Mark LD

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Message-ID: <9fe071f9-27bb-4694-ace5-f23eb0d0e50d@linaro.org>
Date: Tue, 18 Mar 2025 10:48:49 +0000
From: James Clark <james.clark@...aro.org>
To: Ilkka Koskinen <ilkka@...amperecomputing.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Ian Rogers <irogers@...gle.com>,
 John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
 Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/2] perf vendor events arm64: AmpereOne/AmpereOneX: Mark
 LD_RETIRED impacted by errata



On 13/03/2025 8:15 pm, Ilkka Koskinen wrote:
> Atomic instructions are both memory-reading and memory-writing
> instructions and so should be counted by both LD_RETIRED and ST_RETIRED
> performance monitoring events. However LD_RETIRED does not count atomic
> instructions.
> 
> Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
> ---
>   tools/perf/pmu-events/arch/arm64/ampere/ampereone/memory.json | 4 +++-
>   .../perf/pmu-events/arch/arm64/ampere/ampereonex/memory.json  | 4 +++-
>   2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/arch/arm64/ampere/ampereone/memory.json b/tools/perf/pmu-events/arch/arm64/ampere/ampereone/memory.json
> index 0711782bfa6b..13382d29b25f 100644
> --- a/tools/perf/pmu-events/arch/arm64/ampere/ampereone/memory.json
> +++ b/tools/perf/pmu-events/arch/arm64/ampere/ampereone/memory.json
> @@ -1,6 +1,8 @@
>   [
>       {
> -        "ArchStdEvent": "LD_RETIRED"
> +        "ArchStdEvent": "LD_RETIRED",
> +        "Errata": "Errata AC03_CPU_52",
> +        "BriefDescription": "Instruction architecturally executed, condition code check pass, load. Impacted by errata -"

I think this could also have a 'Fixes:' tag, either way:

Reviewed-by: James Clark <james.clark@...aro.org>