Split the TRACE_EVENTs from the LOG/HistogramTimers/TimerEvents functionality.

This CL adds a TRACE_EVENT where there is an isolated LOG, a HistogramTimer
or a TimerEvent.

Once we have a d8 tracing controller, all TimerEvents will be removed since
they do not provide an added value over TRACE_EVENTs. HistogramTimers will
remain, but their functionality will be limited to Histograms only.

BUG=v8:4562
LOG=N

Review URL: https://codereview.chromium.org/1707563002

Cr-Commit-Position: refs/heads/master@{#34099}

src/api.cc

@@ -58,6 +58,7 @@
 #include "src/snapshot/natives.h"
 #include "src/snapshot/snapshot.h"
 #include "src/startup-data-util.h"
+#include "src/tracing/trace-event.h"
 #include "src/unicode-inl.h"
 #include "src/v8.h"
 #include "src/v8threads.h"
@@ -1709,6 +1710,7 @@ MaybeLocal<Value> Script::Run(Local<Context> context) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Script::Run()", Value)
   i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
+  TRACE_EVENT0("v8", "V8.Execute");
   auto fun = i::Handle<i::JSFunction>::cast(Utils::OpenHandle(this));
   i::Handle<i::Object> receiver(isolate->global_proxy(), isolate);
   Local<Value> result;
@@ -1762,6 +1764,7 @@ MaybeLocal<UnboundScript> ScriptCompiler::CompileUnboundInternal(
   i::Handle<i::SharedFunctionInfo> result;
   {
     i::HistogramTimerScope total(isolate->counters()->compile_script(), true);
+    TRACE_EVENT0("v8", "V8.CompileScript");
     i::Handle<i::Object> name_obj;
     i::Handle<i::Object> source_map_url;
     int line_offset = 0;
@@ -4281,6 +4284,7 @@ MaybeLocal<Value> Object::CallAsFunction(Local<Context> context,
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Object::CallAsFunction()",
                                       Value);
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
+  TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
   auto recv_obj = Utils::OpenHandle(*recv);
   STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Object**));
@@ -4307,6 +4311,7 @@ MaybeLocal<Value> Object::CallAsConstructor(Local<Context> context, int argc,
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context,
                                       "v8::Object::CallAsConstructor()", Value);
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
+  TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
   STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Object**));
   i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
@@ -4356,6 +4361,7 @@ MaybeLocal<Object> Function::NewInstance(Local<Context> context, int argc,
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Function::NewInstance()",
                                       Object);
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
+  TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
   STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Object**));
   i::Handle<i::Object>* args = reinterpret_cast<i::Handle<i::Object>*>(argv);
@@ -4379,6 +4385,7 @@ MaybeLocal<v8::Value> Function::Call(Local<Context> context,
                                      v8::Local<v8::Value> argv[]) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Function::Call()", Value);
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
+  TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
   i::Handle<i::Object> recv_obj = Utils::OpenHandle(*recv);
   STATIC_ASSERT(sizeof(v8::Local<v8::Value>) == sizeof(i::Object**));
@@ -7476,6 +7483,7 @@ void Isolate::LowMemoryNotification() {
   {
     i::HistogramTimerScope idle_notification_scope(
         isolate->counters()->gc_low_memory_notification());
+    TRACE_EVENT0("v8", "V8.GCLowMemoryNotification");
     isolate->heap()->CollectAllAvailableGarbage("low memory notification");
   }
 }

src/compiler.cc

@@ -928,10 +928,12 @@ static bool GetOptimizedCodeNow(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
   CanonicalHandleScope canonical(isolate);
   TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
+  TRACE_EVENT0("v8", "V8.OptimizeCode");
 
   if (!Compiler::ParseAndAnalyze(info->parse_info())) return false;
 
   TimerEventScope<TimerEventRecompileSynchronous> timer(isolate);
+  TRACE_EVENT0("v8", "V8.RecompileSynchronous");
 
   OptimizedCompileJob job(info);
   if (job.CreateGraph() != OptimizedCompileJob::SUCCEEDED ||
@@ -958,6 +960,7 @@ static bool GetOptimizedCodeLater(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
   CanonicalHandleScope canonical(isolate);
   TimerEventScope<TimerEventOptimizeCode> optimize_code_timer(isolate);
+  TRACE_EVENT0("v8", "V8.OptimizeCode");
 
   if (!isolate->optimizing_compile_dispatcher()->IsQueueAvailable()) {
     if (FLAG_trace_concurrent_recompilation) {
@@ -976,6 +979,7 @@ static bool GetOptimizedCodeLater(CompilationInfo* info) {
   info->parse_info()->ReopenHandlesInNewHandleScope();
 
   TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
+  TRACE_EVENT0("v8", "V8.RecompileSynchronous");
 
   OptimizedCompileJob* job = new (info->zone()) OptimizedCompileJob(info);
   OptimizedCompileJob::Status status = job->CreateGraph();
@@ -1016,6 +1020,7 @@ MaybeHandle<Code> Compiler::GetLazyCode(Handle<JSFunction> function) {
   DCHECK(!isolate->has_pending_exception());
   DCHECK(!function->is_compiled());
   TimerEventScope<TimerEventCompileCode> compile_timer(isolate);
+  TRACE_EVENT0("v8", "V8.CompileCode");
   AggregatedHistogramTimerScope timer(isolate->counters()->compile_lazy());
   // If the debugger is active, do not compile with turbofan unless we can
   // deopt from turbofan code.
@@ -1224,6 +1229,7 @@ void Compiler::CompileForLiveEdit(Handle<Script> script) {
 static Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
   TimerEventScope<TimerEventCompileCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.CompileCode");
   PostponeInterruptsScope postpone(isolate);
   DCHECK(!isolate->native_context().is_null());
   ParseInfo* parse_info = info->parse_info();
@@ -1283,6 +1289,7 @@ static Handle<SharedFunctionInfo> CompileToplevel(CompilationInfo* info) {
           ? info->isolate()->counters()->compile_eval()
           : info->isolate()->counters()->compile();
     HistogramTimerScope timer(rate);
+    TRACE_EVENT0("v8", info->is_eval() ? "V8.CompileEval" : "V8.Compile");
 
     // Compile the code.
     if (!CompileBaselineCode(info)) {
@@ -1453,6 +1460,7 @@ Handle<SharedFunctionInfo> Compiler::CompileScript(
         !isolate->debug()->is_loaded()) {
       // Then check cached code provided by embedder.
       HistogramTimerScope timer(isolate->counters()->compile_deserialize());
+      TRACE_EVENT0("v8", "V8.CompileDeserialize");
       Handle<SharedFunctionInfo> result;
       if (CodeSerializer::Deserialize(isolate, *cached_data, source)
               .ToHandle(&result)) {
@@ -1521,6 +1529,7 @@ Handle<SharedFunctionInfo> Compiler::CompileScript(
           compile_options == ScriptCompiler::kProduceCodeCache) {
         HistogramTimerScope histogram_timer(
             isolate->counters()->compile_serialize());
+        TRACE_EVENT0("v8", "V8.CompileSerialize");
         *cached_data = CodeSerializer::Serialize(isolate, result, source);
         if (FLAG_profile_deserialization) {
           PrintF("[Compiling and serializing took %0.3f ms]\n",
@@ -1622,6 +1631,7 @@ Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
 
   // Generate code
   TimerEventScope<TimerEventCompileCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.CompileCode");
   Handle<ScopeInfo> scope_info;
   if (lazy) {
     Handle<Code> code = isolate->builtins()->CompileLazy();
@@ -1801,6 +1811,7 @@ MaybeHandle<Code> Compiler::GetConcurrentlyOptimizedCode(
 
   VMState<COMPILER> state(isolate);
   TimerEventScope<TimerEventRecompileSynchronous> timer(info->isolate());
+  TRACE_EVENT0("v8", "V8.RecompileSynchronous");
 
   Handle<SharedFunctionInfo> shared = info->shared_info();
   shared->code()->set_profiler_ticks(0);

src/counters.h

@@ -198,6 +198,8 @@ class Histogram {
     lookup_done_ = false;
   }
 
+  const char* name() { return name_; }
+
  protected:
   // Returns the handle to the histogram.
   void* GetHistogram() {
@@ -208,7 +210,6 @@ class Histogram {
     return histogram_;
   }
 
-  const char* name() { return name_; }
   Isolate* isolate() const { return isolate_; }
 
  private:

src/deoptimizer.cc

@@ -14,6 +14,7 @@
 #include "src/interpreter/interpreter.h"
 #include "src/macro-assembler.h"
 #include "src/profiler/cpu-profiler.h"
+#include "src/tracing/trace-event.h"
 #include "src/v8.h"
 
 
@@ -372,6 +373,7 @@ void Deoptimizer::DeoptimizeMarkedCodeForContext(Context* context) {
 
 void Deoptimizer::DeoptimizeAll(Isolate* isolate) {
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   if (FLAG_trace_deopt) {
     CodeTracer::Scope scope(isolate->GetCodeTracer());
     PrintF(scope.file(), "[deoptimize all code in all contexts]\n");
@@ -390,6 +392,7 @@ void Deoptimizer::DeoptimizeAll(Isolate* isolate) {
 
 void Deoptimizer::DeoptimizeMarkedCode(Isolate* isolate) {
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   if (FLAG_trace_deopt) {
     CodeTracer::Scope scope(isolate->GetCodeTracer());
     PrintF(scope.file(), "[deoptimize marked code in all contexts]\n");
@@ -418,6 +421,7 @@ void Deoptimizer::MarkAllCodeForContext(Context* context) {
 
 void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
   TimerEventScope<TimerEventDeoptimizeCode> timer(function->GetIsolate());
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
   Code* code = function->code();
   if (code->kind() == Code::OPTIMIZED_FUNCTION) {
     // Mark the code for deoptimization and unlink any functions that also

src/full-codegen/full-codegen.cc

@@ -17,6 +17,7 @@
 #include "src/isolate-inl.h"
 #include "src/macro-assembler.h"
 #include "src/snapshot/snapshot.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -27,6 +28,7 @@ bool FullCodeGenerator::MakeCode(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
 
   TimerEventScope<TimerEventCompileFullCode> timer(info->isolate());
+  TRACE_EVENT0("v8", "V8.CompileFullCode");
 
   // Ensure that the feedback vector is large enough.
   info->EnsureFeedbackVector();

src/heap/heap.cc

@@ -38,6 +38,7 @@
 #include "src/snapshot/natives.h"
 #include "src/snapshot/serialize.h"
 #include "src/snapshot/snapshot.h"
+#include "src/tracing/trace-event.h"
 #include "src/type-feedback-vector.h"
 #include "src/utils.h"
 #include "src/v8.h"
@@ -817,6 +818,7 @@ void Heap::FinalizeIncrementalMarking(const char* gc_reason) {
   GCTracer::Scope gc_scope(tracer(), GCTracer::Scope::MC_INCREMENTAL_FINALIZE);
   HistogramTimerScope incremental_marking_scope(
       isolate()->counters()->gc_incremental_marking_finalize());
+  TRACE_EVENT0("v8", "V8.GCIncrementalMarkingFinalize");
 
   {
     GCCallbacksScope scope(this);
@@ -858,7 +860,6 @@ HistogramTimer* Heap::GCTypeTimer(GarbageCollector collector) {
   }
 }
 
-
 void Heap::CollectAllGarbage(int flags, const char* gc_reason,
                              const v8::GCCallbackFlags gc_callback_flags) {
   // Since we are ignoring the return value, the exact choice of space does
@@ -1006,7 +1007,9 @@ bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
     GarbageCollectionPrologue();
 
     {
-      HistogramTimerScope histogram_timer_scope(GCTypeTimer(collector));
+      HistogramTimer* gc_type_timer = GCTypeTimer(collector);
+      HistogramTimerScope histogram_timer_scope(gc_type_timer);
+      TRACE_EVENT0("v8", gc_type_timer->name());
 
       next_gc_likely_to_collect_more =
           PerformGarbageCollection(collector, gc_callback_flags);
@@ -4204,6 +4207,7 @@ bool Heap::PerformIdleTimeAction(GCIdleTimeAction action,
     case DO_FULL_GC: {
       DCHECK(contexts_disposed_ > 0);
       HistogramTimerScope scope(isolate_->counters()->gc_context());
+      TRACE_EVENT0("v8", "V8.GCContext");
       CollectAllGarbage(kNoGCFlags, "idle notification: contexts disposed");
       break;
     }
@@ -4289,6 +4293,7 @@ bool Heap::IdleNotification(double deadline_in_seconds) {
       static_cast<double>(base::Time::kMillisecondsPerSecond);
   HistogramTimerScope idle_notification_scope(
       isolate_->counters()->gc_idle_notification());
+  TRACE_EVENT0("v8", "V8.GCIdleNotification");
   double start_ms = MonotonicallyIncreasingTimeInMs();
   double idle_time_in_ms = deadline_in_ms - start_ms;
 

src/heap/incremental-marking.cc

@@ -12,6 +12,7 @@
 #include "src/heap/mark-compact-inl.h"
 #include "src/heap/objects-visiting.h"
 #include "src/heap/objects-visiting-inl.h"
+#include "src/tracing/trace-event.h"
 #include "src/v8.h"
 
 namespace v8 {
@@ -534,6 +535,7 @@ void IncrementalMarking::Start(const char* reason) {
 
   HistogramTimerScope incremental_marking_scope(
       heap_->isolate()->counters()->gc_incremental_marking_start());
+  TRACE_EVENT0("v8", "V8.GCIncrementalMarkingStart");
   ResetStepCounters();
 
   was_activated_ = true;
@@ -1151,6 +1153,7 @@ intptr_t IncrementalMarking::Step(intptr_t allocated_bytes,
   {
     HistogramTimerScope incremental_marking_scope(
         heap_->isolate()->counters()->gc_incremental_marking());
+    TRACE_EVENT0("v8", "V8.GCIncrementalMarking");
     double start = heap_->MonotonicallyIncreasingTimeInMs();
 
     // The marking speed is driven either by the allocation rate or by the rate

src/ic/ic.cc

@@ -23,6 +23,7 @@
 #include "src/prototype.h"
 #include "src/runtime/runtime.h"
 #include "src/runtime/runtime-utils.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -2209,6 +2210,7 @@ void CallIC::HandleMiss(Handle<Object> function) {
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(Runtime_CallIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
   Handle<Object> function = args.at<Object>(0);
@@ -2225,6 +2227,7 @@ RUNTIME_FUNCTION(Runtime_CallIC_Miss) {
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(Runtime_LoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
@@ -2257,6 +2260,7 @@ RUNTIME_FUNCTION(Runtime_LoadIC_Miss) {
 // Used from ic-<arch>.cc
 RUNTIME_FUNCTION(Runtime_KeyedLoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
@@ -2276,6 +2280,7 @@ RUNTIME_FUNCTION(Runtime_KeyedLoadIC_Miss) {
 
 RUNTIME_FUNCTION(Runtime_KeyedLoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
@@ -2297,6 +2302,7 @@ RUNTIME_FUNCTION(Runtime_KeyedLoadIC_MissFromStubFailure) {
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(Runtime_StoreIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
@@ -2328,6 +2334,7 @@ RUNTIME_FUNCTION(Runtime_StoreIC_Miss) {
 
 RUNTIME_FUNCTION(Runtime_StoreIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
@@ -2380,6 +2387,7 @@ RUNTIME_FUNCTION(Runtime_StoreIC_MissFromStubFailure) {
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(Runtime_KeyedStoreIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
@@ -2401,6 +2409,7 @@ RUNTIME_FUNCTION(Runtime_KeyedStoreIC_Miss) {
 
 RUNTIME_FUNCTION(Runtime_KeyedStoreIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
@@ -2458,6 +2467,7 @@ RUNTIME_FUNCTION(Runtime_KeyedStoreIC_Slow) {
 
 RUNTIME_FUNCTION(Runtime_ElementsTransitionAndStoreIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   // Length == 5 or 6, depending on whether the vector slot
   // is passed in a virtual register or not.
@@ -2605,6 +2615,7 @@ MaybeHandle<Object> BinaryOpIC::Transition(
 
 RUNTIME_FUNCTION(Runtime_BinaryOpIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   Handle<Object> left = args.at<Object>(BinaryOpICStub::kLeft);
@@ -2620,6 +2631,7 @@ RUNTIME_FUNCTION(Runtime_BinaryOpIC_Miss) {
 
 RUNTIME_FUNCTION(Runtime_BinaryOpIC_MissWithAllocationSite) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   Handle<AllocationSite> allocation_site =
@@ -2694,6 +2706,7 @@ Code* CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
 // Used from CompareICStub::GenerateMiss in code-stubs-<arch>.cc.
 RUNTIME_FUNCTION(Runtime_CompareIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
   CompareIC ic(isolate, static_cast<Token::Value>(args.smi_at(2)));
@@ -2744,6 +2757,7 @@ Handle<Object> CompareNilIC::CompareNil(Handle<Object> object) {
 
 RUNTIME_FUNCTION(Runtime_CompareNilIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> object = args.at<Object>(0);
   CompareNilIC ic(isolate);
@@ -2769,6 +2783,7 @@ Handle<Object> ToBooleanIC::ToBoolean(Handle<Object> object) {
 
 RUNTIME_FUNCTION(Runtime_ToBooleanIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   DCHECK(args.length() == 1);
   HandleScope scope(isolate);
   Handle<Object> object = args.at<Object>(0);
@@ -2917,6 +2932,7 @@ RUNTIME_FUNCTION(Runtime_LoadElementWithInterceptor) {
 
 RUNTIME_FUNCTION(Runtime_LoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.IcMiss");
   HandleScope scope(isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);

src/log-inl.h

@@ -38,19 +38,6 @@ void Logger::CallEventLogger(Isolate* isolate, const char* name, StartEnd se,
       isolate->event_logger()(name, se);
     }
   }
-  if (expose_to_api) {
-    if (se == START) {
-      TRACE_EVENT_BEGIN0("v8", name);
-    } else {
-      TRACE_EVENT_END0("v8", name);
-    }
-  } else {
-    if (se == START) {
-      TRACE_EVENT_BEGIN0(TRACE_DISABLED_BY_DEFAULT("v8"), name);
-    } else {
-      TRACE_EVENT_END0(TRACE_DISABLED_BY_DEFAULT("v8"), name);
-    }
-  }
 }
 }  // namespace internal
 }  // namespace v8

src/log.cc

@@ -934,6 +934,7 @@ void Logger::TimerEvent(Logger::StartEnd se, const char* name) {
 
 void Logger::EnterExternal(Isolate* isolate) {
   LOG(isolate, TimerEvent(START, TimerEventExternal::name()));
+  TRACE_EVENT_BEGIN0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.External");
   DCHECK(isolate->current_vm_state() == JS);
   isolate->set_current_vm_state(EXTERNAL);
 }
@@ -941,6 +942,7 @@ void Logger::EnterExternal(Isolate* isolate) {
 
 void Logger::LeaveExternal(Isolate* isolate) {
   LOG(isolate, TimerEvent(END, TimerEventExternal::name()));
+  TRACE_EVENT_END0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.External");
   DCHECK(isolate->current_vm_state() == EXTERNAL);
   isolate->set_current_vm_state(JS);
 }

src/optimizing-compile-dispatcher.cc

@@ -7,6 +7,7 @@
 #include "src/base/atomicops.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/isolate.h"
+#include "src/tracing/trace-event.h"
 #include "src/v8.h"
 
 namespace v8 {
@@ -59,6 +60,7 @@ class OptimizingCompileDispatcher::CompileTask : public v8::Task {
         isolate_->optimizing_compile_dispatcher();
     {
       TimerEventScope<TimerEventRecompileConcurrent> timer(isolate_);
+      TRACE_EVENT0("v8", "V8.RecompileConcurrent");
 
       if (dispatcher->recompilation_delay_ != 0) {
         base::OS::Sleep(base::TimeDelta::FromMilliseconds(

src/parsing/parser.cc

@@ -23,6 +23,7 @@
 #include "src/parsing/scanner-character-streams.h"
 #include "src/runtime/runtime.h"
 #include "src/string-stream.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -796,6 +797,7 @@ FunctionLiteral* Parser::ParseProgram(Isolate* isolate, ParseInfo* info) {
   DCHECK(parsing_on_main_thread_);
 
   HistogramTimerScope timer_scope(isolate->counters()->parse(), true);
+  TRACE_EVENT0("v8", "V8.Parse");
   Handle<String> source(String::cast(info->script()->source()));
   isolate->counters()->total_parse_size()->Increment(source->length());
   base::ElapsedTimer timer;
@@ -964,6 +966,7 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info) {
   // called in the main thread.
   DCHECK(parsing_on_main_thread_);
   HistogramTimerScope timer_scope(isolate->counters()->parse_lazy());
+  TRACE_EVENT0("v8", "V8.ParseLazy");
   Handle<String> source(String::cast(info->script()->source()));
   isolate->counters()->total_parse_size()->Increment(source->length());
   base::ElapsedTimer timer;
@@ -4838,6 +4841,8 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
   if (pre_parse_timer_ != NULL) {
     pre_parse_timer_->Start();
   }
+  TRACE_EVENT0("v8", "V8.PreParse");
+
   DCHECK_EQ(Token::LBRACE, scanner()->current_token());
 
   if (reusable_preparser_ == NULL) {

src/runtime/runtime-compiler.cc

@@ -137,6 +137,7 @@ RUNTIME_FUNCTION(Runtime_NotifyDeoptimized) {
   Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
   DCHECK(AllowHeapAllocation::IsAllowed());
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
+  TRACE_EVENT0("v8", "V8.DeoptimizeCode");
 
   Handle<JSFunction> function = deoptimizer->function();
   Handle<Code> optimized_code = deoptimizer->compiled_code();

src/vm-state-inl.h

@@ -8,6 +8,7 @@
 #include "src/vm-state.h"
 #include "src/log.h"
 #include "src/simulator.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -39,18 +40,24 @@ inline const char* StateToString(StateTag state) {
 template <StateTag Tag>
 VMState<Tag>::VMState(Isolate* isolate)
     : isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
-  if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
+  if (previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
+    if (FLAG_log_timer_events) {
       LOG(isolate_, TimerEvent(Logger::START, TimerEventExternal::name()));
     }
+    TRACE_EVENT_BEGIN0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.External");
+  }
   isolate_->set_current_vm_state(Tag);
 }
 
 
 template <StateTag Tag>
 VMState<Tag>::~VMState() {
-  if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
+  if (previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
+    if (FLAG_log_timer_events) {
       LOG(isolate_, TimerEvent(Logger::END, TimerEventExternal::name()));
     }
+    TRACE_EVENT_END0(TRACE_DISABLED_BY_DEFAULT("v8"), "V8.External");
+  }
   isolate_->set_current_vm_state(previous_tag_);
 }