Tracing macros perftests.

components/tracing/test/trace_event_perftest.cc

Index: components/tracing/test/trace_event_perftest.cc
diff --git a/components/tracing/test/trace_event_perftest.cc b/components/tracing/test/trace_event_perftest.cc
index 4c93e2fb0cfefbc34bf495d40036bebe2543f0f2..98f398a1424794b905f4b4dbcfe3ef44af3712e9 100644
--- a/components/tracing/test/trace_event_perftest.cc
+++ b/components/tracing/test/trace_event_perftest.cc
@@ -3,9 +3,11 @@
 // found in the LICENSE file.
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/run_loop.h"
 #include "base/trace_event/trace_event.h"
+#include "base/trace_event/trace_event_argument.h"
 #include "perf_test_helpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -15,6 +17,7 @@ namespace {
 using base::trace_event::TraceConfig;
 using base::trace_event::TraceLog;
 using base::trace_event::TraceRecordMode;
+using base::trace_event::TracedValue;
 
 const int kNumRuns = 100;
 
@@ -35,6 +38,24 @@ class TraceEventPerfTest : public ::testing::Test {
     run_loop.Run();
   }
 
+  std::unique_ptr<TracedValue> MakeTracedValue(int counter) {
+    auto value = base::WrapUnique(new TracedValue);

[Primiano Tucci (use gerrit), 2016/10/28 09:43:11]

I think MakeUnique is the preferred one for new instances? 

+    value->SetInteger("counter", counter);
+    value->BeginDictionary("test_dict");
+    value->BeginArray("nodes");
+    for (int i = 0; i < 10; i++) {
+      value->BeginDictionary();
+      value->SetInteger("id", i);
+      value->SetBoolean("valid", true);
+      value->SetString("value", "foo");
+      value->EndDictionary();
+    }
+    value->EndArray();
+    value->SetInteger("count", 10);
+    value->EndDictionary();
+    return value;
+  }
+
   static void OnTraceDataCollected(
       base::Closure quit_closure,
       const scoped_refptr<base::RefCountedString>& events_str,
@@ -57,5 +78,39 @@ TEST_F(TraceEventPerfTest, Submit_10000_TRACE_EVENT0) {
   EndTraceAndFlush();
 }
 
+TEST_F(TraceEventPerfTest, Long_TRACE_EVENT0) {
+  BeginTrace();
+  IterableStopwatch stopwatch("long_event");
+  for (int lap = 0; lap < kNumRuns; lap++) {
+    TRACE_EVENT0("test_category", "Outter event");

[Primiano Tucci (use gerrit), 2016/10/28 09:43:11]

typo, extra t in outter

+    for (int i = 0; i < 10000; i++) {
+      TRACE_EVENT0("test_category", "TRACE_EVENT0 call");
+    }
+    stopwatch.NextLap();
+  }
+  EndTraceAndFlush();
+}
+
+TEST_F(TraceEventPerfTest, UsingTracedValue) {
+  BeginTrace();
+  std::unique_ptr<TracedValue> value;
+  {
+    ScopedStopwatch value_sw("create_traced_values");
+    for (int i = 0; i < 10000; i++) {
+      value = MakeTracedValue(i);
+    }
+  }
+
+  IterableStopwatch trace_sw("instant_events_with_value");

[Primiano Tucci (use gerrit), 2016/10/28 09:43:11]

i'd just drop instant_ here to keep the metric more compact.

+  for (int lap = 0; lap < kNumRuns; lap++) {
+    for (int i = 0; i < 10000; i++) {
+      TRACE_EVENT_INSTANT1("test_category", "event_with_value",
+          TRACE_EVENT_SCOPE_THREAD, "value", MakeTracedValue(i));
+    }
+    trace_sw.NextLap();
+  }
+  EndTraceAndFlush();
+}
+
 }  // namespace
 }  // namespace tracing