linux-kernel - [PATCH v4 5/5] perf docs: Document tool and hwmon events

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Message-Id: <20241015210629.1150428-6-irogers@google.com>
Date: Tue, 15 Oct 2024 14:06:28 -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>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Ravi Bangoria <ravi.bangoria@....com>, 
	Weilin Wang <weilin.wang@...el.com>, Yoshihiro Furudera <fj5100bi@...itsu.com>, 
	James Clark <james.clark@...aro.org>, Athira Jajeev <atrajeev@...ux.vnet.ibm.com>, 
	Howard Chu <howardchu95@...il.com>, Oliver Upton <oliver.upton@...ux.dev>, 
	Changbin Du <changbin.du@...wei.com>, Ze Gao <zegao2021@...il.com>, 
	Yang Jihong <yangjihong1@...wei.com>, Junhao He <hejunhao3@...wei.com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v4 5/5] perf docs: Document tool and hwmon events

Add a few paragraphs on tool and hwmon events.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Documentation/perf-list.txt | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 14621f39b375..d0c65fad419a 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -243,6 +243,21 @@ For accessing trace point events perf needs to have read access to
 /sys/kernel/tracing, even when perf_event_paranoid is in a relaxed
 setting.
 
+TOOL/HWMON EVENTS
+-----------------
+
+Some events don't have an associated PMU instead reading values
+available to software without perf_event_open. As these events don't
+support sampling they can only really be read by tools like perf stat.
+
+Tool events provide times and certain system parameters. Examples
+include duration_time, user_time, system_time and num_cpus_online.
+
+Hwmon events provide easy access to hwmon sysfs data typically in
+/sys/class/hwmon. This information includes temperatures, fan speeds
+and energy usage.
+
+
 TRACING
 -------
 
-- 
2.47.0.rc1.288.g06298d1525-goog