[PATCH v2] perf tools: Support -x for perf stat report

[Andi Kleen <andi@firstfloor.org>]

Add support for the -x, option to enable CSV output with perf stat
report. Useful to parse the information with other programs.

% perf stat record --quiet -a -I 1000 sleep 5
% perf stat report -x,
     1.000838672,4003.55,msec,cpu-clock,4003548736,100.00,,
     1.000838672,11243,,context-switches,4003631885,100.00,0.003,M/sec
     1.000838672,1682,,cpu-migrations,4003672150,100.00,0.420,K/sec
     1.000838672,13244,,page-faults,4003697471,100.00,0.003,M/sec
     1.000838672,2953214077,,cycles,4003715495,100.00,0.738,GHz
     1.000838672,4380820799,,instructions,4003738270,100.00,1.48,insn per cycle
     1.000838672,809865653,,branches,4003760616,100.00,202.287,M/sec
     1.000838672,12439843,,branch-misses,4003780785,100.00,1.54,of all branches
...

Signed-off-by: Andi Kleen <ak@linux.intel.com>

---

v2: Fix default output (Jiri). Also handle \t as special value like the
original parser (Andi)
---
 tools/perf/builtin-stat.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 743fe47e7a88..2f7eb6b68344 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1988,6 +1988,8 @@ static int __cmd_report(int argc, const char **argv)
 		     "aggregate counts per numa node", AGGR_NODE),
 	OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
 		     "disable CPU count aggregation", AGGR_NONE),
+	OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
+		   "print counts with custom separator"),
 	OPT_END()
 	};
 	struct stat st;
@@ -2002,6 +2004,13 @@ static int __cmd_report(int argc, const char **argv)
 			input_name = "perf.data";
 	}
 
+	if (strcmp(stat_config.csv_sep, " ")) {
+		stat_config.csv_output = true;
+		if (!strcmp(stat_config.csv_sep, "\\t"))
+			stat_config.csv_sep = "\t";
+		stat_config.big_num = false;
+	}
+
 	perf_stat.data.path = input_name;
 	perf_stat.data.mode = PERF_DATA_MODE_READ;
 
-- 
2.28.0