perf ftrace: Add support for -a and -C option
The -a/--all-cpus and -C/--cpu option is for controlling tracing cpus.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170224011251.14946-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 2d39397..6e6a8b2 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -34,6 +34,20 @@
--pid=::
Trace on existing process id (comma separated list).
+-a::
+--all-cpus::
+ Force system-wide collection. Scripts run without a <command>
+ normally use -a by default, while scripts run with a <command>
+ normally don't - this option allows the latter to be run in
+ system-wide mode.
+
+-C::
+--cpu=::
+ Only trace for the list of CPUs provided. Multiple CPUs can
+ be provided as a comma separated list with no space like: 0,1.
+ Ranges of CPUs are specified with -: 0-2.
+ Default is to trace on all online CPUs.
+
SEE ALSO
--------