[PATCH 3/4] perf stat: Add --exclude-guest option

[Namhyung Kim <namhyung@kernel.org>]

This option is to support the old behavior of setting exclude_guest by
default.  Now it doesn't set the bit so users want the old behavior can
use this option.

  $ perf stat true

   Performance counter stats for 'true':

                0.86 msec task-clock:u                     #    0.443 CPUs utilized
                   0      context-switches:u               #    0.000 /sec
                   0      cpu-migrations:u                 #    0.000 /sec
                  49      page-faults:u                    #   56.889 K/sec
                 ...

  $ perf stat --exclude-guest true

   Performance counter stats for 'true':

                0.79 msec task-clock:Hu                    #    0.490 CPUs utilized
                   0      context-switches:Hu              #    0.000 /sec
                   0      cpu-migrations:Hu                #    0.000 /sec
                  49      page-faults:Hu                   #   62.078 K/sec
                 ...

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/Documentation/perf-stat.txt | 7 +++++++
 tools/perf/builtin-stat.c              | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 2bc063672486..d28d8370a856 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -382,6 +382,13 @@ color the metric's computed value.
 Don't print output, warnings or messages. This is useful with perf stat
 record below to only write data to the perf.data file.
 
+--exclude-guest::
+Don't count event in the guest mode.  It was the old behavior but the
+default is changed to count guest events also.  Use this option if you
+want the old behavior (host only).  Note that this option needs to be
+before other events in case you added -e/--event option in the command
+line.
+
 STAT RECORD
 -----------
 Stores stat data into perf data file.
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index cf985cdb9a6e..8b9889873d3e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2492,6 +2492,8 @@ int cmd_stat(int argc, const char **argv)
 		OPT_BOOLEAN_FLAG(0, "all-user", &stat_config.all_user,
 				"Configure all used events to run in user space.",
 				PARSE_OPT_EXCLUSIVE),
+		OPT_BOOLEAN(0, "exclude-guest", &exclude_HG_default,
+			"Don't count events in the guest mode"),
 		OPT_BOOLEAN(0, "percore-show-thread", &stat_config.percore_show_thread,
 			"Use with 'percore' event qualifier to show the event "
 			"counts of one hardware thread by sum up total hardware "
-- 
2.46.0.469.g59c65b2a67-goog