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

Ian Rogers
2024-04-23T03:17:43Z

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