linux-kernel - Re: [RFC PATCH v2 2/3] perf parse-events: Add a retirement latency modifier

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Message-ID: <CAM9d7cgcC-qO63neiCtyovC6qiAprMs=HKF66XvfiBqZrOiXXg@mail.gmail.com>
Date: Mon, 29 Apr 2024 14:07:48 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: weilin.wang@...el.com, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Ze Gao <zegao2021@...il.com>, Leo Yan <leo.yan@...ux.dev>, 
	Ravi Bangoria <ravi.bangoria@....com>, Dmitrii Dolgov <9erthalion6@...il.com>, 
	Song Liu <song@...nel.org>, James Clark <james.clark@....com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 2/3] perf parse-events: Add a retirement latency modifier

On Sat, Apr 27, 2024 at 10:36 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Retirement latency is a separate sampled count used on newer Intel
> CPUs.

Can you please update the "event modifiers" section in the perf list
documentation too?

Also I'm curious if we have a doc for the JSON metric format.

Thanks,
Namhyung

>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/evsel.h        | 1 +
>  tools/perf/util/parse-events.c | 2 ++
>  tools/perf/util/parse-events.h | 1 +
>  tools/perf/util/parse-events.l | 3 ++-
>  4 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 43f6fd1dcb4d..bd8e84954e34 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -98,6 +98,7 @@ struct evsel {
>                 bool                    bpf_counter;
>                 bool                    use_config_name;
>                 bool                    skippable;
> +               bool                    retire_lat;
>                 int                     bpf_fd;
>                 struct bpf_object       *bpf_obj;
>                 struct list_head        config_terms;
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 0f308b4db2b9..9c2a76ec8c99 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1818,6 +1818,8 @@ static int parse_events__modifier_list(struct parse_events_state *parse_state,
>                         evsel->weak_group = true;
>                 if (mod.bpf)
>                         evsel->bpf_counter = true;
> +               if (mod.retire_lat)
> +                       evsel->retire_lat = true;
>         }
>         return 0;
>  }
> diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> index 5695308efab9..eb94d1247dae 100644
> --- a/tools/perf/util/parse-events.h
> +++ b/tools/perf/util/parse-events.h
> @@ -201,6 +201,7 @@ struct parse_events_modifier {
>         bool hypervisor : 1;    /* 'h' */
>         bool guest : 1;         /* 'G' */
>         bool host : 1;          /* 'H' */
> +       bool retire_lat : 1;    /* 'R' */
>  };
>
>  int parse_events__modifier_event(struct parse_events_state *parse_state, void *loc,
> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> index 08ea2d845dc3..85015f080240 100644
> --- a/tools/perf/util/parse-events.l
> +++ b/tools/perf/util/parse-events.l
> @@ -209,6 +209,7 @@ static int modifiers(struct parse_events_state *parse_state, yyscan_t scanner)
>                 CASE('W', weak);
>                 CASE('e', exclusive);
>                 CASE('b', bpf);
> +               CASE('R', retire_lat);
>                 default:
>                         return PE_ERROR;
>                 }
> @@ -250,7 +251,7 @@ drv_cfg_term        [a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\:]+)?
>   * If you add a modifier you need to update check_modifier().
>   * Also, the letters in modifier_event must not be in modifier_bp.
>   */
> -modifier_event [ukhpPGHSDIWeb]{1,15}
> +modifier_event [ukhpPGHSDIWebR]{1,16}
>  modifier_bp    [rwx]{1,3}
>  lc_type        (L1-dcache|l1-d|l1d|L1-data|L1-icache|l1-i|l1i|L1-instruction|LLC|L2|dTLB|d-tlb|Data-TLB|iTLB|i-tlb|Instruction-TLB|branch|branches|bpu|btb|bpc|node)
>  lc_op_result   (load|loads|read|store|stores|write|prefetch|prefetches|speculative-read|speculative-load|refs|Reference|ops|access|misses|miss)
> --
> 2.44.0.769.g3c40516874-goog
>