linux-kernel - [PATCH v2 2/6] perf Document: Capture that sysfs event names must be lower case

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Message-Id: <20240423031719.1941141-3-irogers@google.com>
Date: Mon, 22 Apr 2024 20:17:15 -0700
From: Ian Rogers <irogers@...gle.com>
To: Kan Liang <kan.liang@...ux.intel.com>, 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>, 
	Jonathan Corbet <corbet@....net>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Randy Dunlap <rdunlap@...radead.org>, Jing Zhang <renyu.zj@...ux.alibaba.com>, 
	James Clark <james.clark@....com>, Ravi Bangoria <ravi.bangoria@....com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 2/6] perf Document: Capture that sysfs event names must be
 lower case

To avoid directory scans in perf it is going to be assumed that sysfs
event names are lower case.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 .../ABI/testing/sysfs-bus-event_source-devices-events       | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
index 77de58d03822..3e0100e9c664 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
@@ -37,6 +37,12 @@ Description:	Per-pmu performance monitoring events specific to the running syste
 		performance monitoring event supported by the <pmu>. The name
 		of the file is the name of the event.
 
+		As performance monitoring event names are case
+		insensitive in the perf tool, the perf tool only looks
+		for lower case event names in sysfs to avoid scanning
+		the directory. It is therefore required the name of
+		the event here is lower case.
+
 		File contents:
 
 			<term>[=<value>][,<term>[=<value>]]...
-- 
2.44.0.769.g3c40516874-goog