linux-kernel - [PATCH v2 2/2] perf stat: Document --metric-no-threshold and threshold colors

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Message-Id: <20230519063719.1029596-2-irogers@google.com>
Date:   Thu, 18 May 2023 23:37:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Kan Liang <kan.liang@...ux.intel.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>
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 2/2] perf stat: Document --metric-no-threshold and
 threshold colors

Document the threshold behavior for -M/--metrics.

Signed-off-by: Ian Rogers <irogers@...gle.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.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..694950345e15 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 hasn't. The default color means that
+	no threshold information was available or the threshold
+	couldn't be computed.
+
 -A::
 --no-aggr::
 Do not aggregate counts across all monitored CPUs.
-- 
2.40.1.698.g37aff9b760-goog