perf config: Add stat.big-num support

Add support for new "stat.big-num" boolean option.

This allows a user to set a default for "--no-big-num" for "perf stat"
commands.

--
  $ perf config stat.big-num
  $ perf stat --event cycles /bin/true

   Performance counter stats for '/bin/true':

             778,849      cycles
  [...]
  $ perf config stat.big-num=false
  $ perf config stat.big-num
  stat.big-num=false
  $ perf stat --event cycles /bin/true

   Performance counter stats for '/bin/true':

              769622      cycles
  [...]
--

There is an interaction with "--field-separator" that must be
accommodated, such that specifying "--big-num --field-separator={x}"
still reports an invalid combination of options.

Documentation for perf-config and perf-stat updated.

Signed-off-by: Paul Clarke <pc@us.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lore.kernel.org/lkml/1589991815-17951-1-git-send-email-pc@us.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index ef38eba56ed0..8e65f1fa421f 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -17,6 +17,7 @@
 #include "util/event.h"  /* proc_map_timeout */
 #include "util/hist.h"  /* perf_hist_config */
 #include "util/llvm-utils.h"   /* perf_llvm_config */
+#include "util/stat.h"  /* perf_stat__set_big_num */
 #include "build-id.h"
 #include "debug.h"
 #include "config.h"
@@ -452,6 +453,15 @@ static int perf_ui_config(const char *var, const char *value)
 	return 0;
 }
 
+static int perf_stat_config(const char *var, const char *value)
+{
+	if (!strcmp(var, "stat.big-num"))
+		perf_stat__set_big_num(perf_config_bool(var, value));
+
+	/* Add other config variables here. */
+	return 0;
+}
+
 int perf_default_config(const char *var, const char *value,
 			void *dummy __maybe_unused)
 {
@@ -473,6 +483,9 @@ int perf_default_config(const char *var, const char *value,
 	if (strstarts(var, "buildid."))
 		return perf_buildid_config(var, value);
 
+	if (strstarts(var, "stat."))
+		return perf_stat_config(var, value);
+
 	/* Add other config variables here. */
 	return 0;
 }