simpleperf: add interval to stat print

Add a stat interval printing

Bug: http://b/31806433
Test: simpleperf_unit_test --gtest_filter=stat_cmd.interval_option
Change-Id: Ia2881d990036cc099baccb8a2d8cd3828877a910
(cherry picked from commit e6d8a52400fe710b743ce57b89bd015ab219434b)

1 files changed, 18 insertions, 1 deletions

diff --git a/simpleperf/cmd_stat_test.cpp b/simpleperf/cmd_stat_test.cpp
index 5748b7a7..25fcaf99 100644
--- a/simpleperf/cmd_stat_test.cpp
+++ b/simpleperf/cmd_stat_test.cpp
@@ -85,7 +85,7 @@ TEST(stat_cmd, no_monitored_threads) { ASSERT_FALSE(StatCmd()->Run({""})); }
 
 TEST(stat_cmd, group_option) {
   ASSERT_TRUE(
-      StatCmd()->Run({"--group", "cpu-cycles,cpu-clock", "sleep", "1"}));
+      StatCmd()->Run({"--group", "cpu-clock,page-faults", "sleep", "1"}));
   ASSERT_TRUE(StatCmd()->Run({"--group", "cpu-cycles,instructions", "--group",
                               "cpu-cycles:u,instructions:u", "--group",
                               "cpu-cycles:k,instructions:k", "sleep", "1"}));
@@ -112,6 +112,23 @@ TEST(stat_cmd, duration_option) {
   ASSERT_TRUE(StatCmd()->Run({"--duration", "1", "sleep", "2"}));
 }
 
+TEST(stat_cmd, interval_option) {
+  TemporaryFile tmp_file;
+  ASSERT_TRUE(
+    StatCmd()->Run({"--interval", "500.0", "--duration", "1.2", "-o",
+          tmp_file.path, "sleep", "2"}));
+  std::string s;
+  ASSERT_TRUE(android::base::ReadFileToString(tmp_file.path, &s));
+  size_t count = 0;
+  size_t pos = 0;
+  std::string subs = "statistics:";
+  while((pos = s.find(subs, pos)) != s.npos) {
+    pos += subs.size();
+    ++count ;
+  }
+  ASSERT_EQ(count, 3UL);
+}
+
 TEST(stat_cmd, no_modifier_for_clock_events) {
   for (const std::string& e : {"cpu-clock", "task-clock"}) {
     for (const std::string& m : {"u", "k"}) {