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-rw-r--r--tools/perf/Documentation/perf-record.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 3cf7bac67239..55df7b073a55 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -30,8 +30,10 @@ OPTIONS
- a symbolic event name (use 'perf list' to list all events)
- - a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
- hexadecimal event descriptor.
+ - a raw PMU event in the form of rN where N is a hexadecimal value
+ that represents the raw register encoding with the layout of the
+ event control registers as described by entries in
+ /sys/bus/event_sources/devices/cpu/format/*.
- a symbolic or raw PMU event followed by an optional colon
and a list of event modifiers, e.g., cpu-cycles:p. See the