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

[Ian Rogers <irogers@google.com>]

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@google.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