linux-kernel - Re: [PATCH v1 2/2] perf stat: Document --metric-no-threshold and threshold colors

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Date:   Thu, 18 May 2023 15:52:34 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Ian Rogers <irogers@...gle.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>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Eduard Zingerman <eddyz87@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ahmad Yasin <ahmad.yasin@...el.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Weilin Wang <weilin.wang@...el.com>,
        Edward Baker <edward.baker@...el.com>
Subject: Re: [PATCH v1 2/2] perf stat: Document --metric-no-threshold and
 threshold colors



On 2023-05-04 3:58 p.m., Ian Rogers wrote:
> Document the threshold behavior for -M/--metrics.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/Documentation/perf-stat.txt | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
> index 29bdcfa93f04..ff71399db738 100644
> --- a/tools/perf/Documentation/perf-stat.txt
> +++ b/tools/perf/Documentation/perf-stat.txt
> @@ -353,6 +353,15 @@ small group that need not have multiplexing is lowered. This option
>  forbids the event merging logic from sharing events between groups and
>  may be used to increase accuracy in this case.
>  
> +--metric-no-threshold::
> +Metric thresholds may increase the number of events necessary to
> +compute whether a metric has exceeded its threshold expression. This
> +may not be desirable, for example, as the events can introduce
> +multiplexing. This option disables the adding of threshold expression
> +events for a metric. However, if there are sufficient events to
> +compute the threshold then the threshold is still computed and used to
> +color the metric's computed value.
> +
>  --quiet::
>  Don't print output, warnings or messages. This is useful with perf stat
>  record below to only write data to the perf.data file.
> @@ -389,6 +398,12 @@ For a group all metrics from the group are added.
>  The events from the metrics are automatically measured.
>  See perf list output for the possible metrics and metricgroups.
>  
> +	When threshold information is available for a metric, the
> +	color red is used to signify a metric has exceeded a threshold
> +	while green shows it is hasn't. The default color means that

A typo. "it is hasn't" -> "it hasn't"

Rest looks good to me.

Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>

Thanks,
Kan

> +	no threshold information was available or the threshold
> +	couldn't be computed.
> +
>  -A::
>  --no-aggr::
>  Do not aggregate counts across all monitored CPUs.