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perf docs: Document tool and hwmon events

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Add a few paragraphs on tool and hwmon events.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Yoshihiro Furudera <fj5100bi@fujitsu.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ze Gao <zegao2021@gmail.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Junhao He <hejunhao3@huawei.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20241109003759.473460-8-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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Ian Rogers 2024-11-08 16:37:59 -08:00 committed by Namhyung Kim
parent 531ee0fd48
commit 6d5d90a6ab
1 changed files with 15 additions and 0 deletions
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15
tools/perf/Documentation/perf-list.txt
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@ -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
-------