No need to start Ticker for Crankshaft

Crankshaft doesn't depend on the sampler thread any more. No
need to start the that thread for Crankshaft.

BUG=v8:2609

Review URL: https://codereview.chromium.org/13526003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14166 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.cc

@@ -1808,7 +1808,8 @@ void Isolate::Deinit() {
     if (FLAG_hydrogen_stats) GetHStatistics()->Print();
 
     // We must stop the logger before we tear down other components.
-    logger_->EnsureTickerStopped();
+    Sampler* sampler = logger_->sampler();
+    if (sampler && sampler->IsActive()) sampler->Stop();
 
     delete deoptimizer_data_;
     deoptimizer_data_ = NULL;

src/log.cc

@@ -1560,11 +1560,6 @@ void Logger::LogFailure() {
 }
 
 
-bool Logger::IsProfilerSamplerActive() {
-  return ticker_->IsActive();
-}
-
-
 class EnumerateOptimizedFunctionsVisitor: public OptimizedFunctionVisitor {
  public:
   EnumerateOptimizedFunctionsVisitor(Handle<SharedFunctionInfo>* sfis,
@@ -1937,17 +1932,6 @@ Sampler* Logger::sampler() {
 }
 
 
-void Logger::EnsureTickerStarted() {
-  ASSERT(ticker_ != NULL);
-  if (!ticker_->IsActive()) ticker_->Start();
-}
-
-
-void Logger::EnsureTickerStopped() {
-  if (ticker_ != NULL && ticker_->IsActive()) ticker_->Stop();
-}
-
-
 FILE* Logger::TearDown() {
   if (!is_initialized_) return NULL;
   is_initialized_ = false;

src/log.h

@@ -168,9 +168,6 @@ class Logger {
   void SetCodeEventHandler(uint32_t options,
                            JitCodeEventHandler event_handler);
 
-  void EnsureTickerStarted();
-  void EnsureTickerStopped();
-
   Sampler* sampler();
 
   // Frees resources acquired in SetUp.
@@ -448,9 +445,6 @@ class Logger {
   void UncheckedIntEvent(const char* name, int value);
   void UncheckedIntPtrTEvent(const char* name, intptr_t value);
 
-  // Returns whether profiler's sampler is active.
-  bool IsProfilerSamplerActive();
-
   Isolate* isolate_;
 
   // The sampler used by the profiler and the sliding state window.

src/runtime-profiler.cc

@@ -389,9 +389,6 @@ void RuntimeProfiler::SetUp() {
   if (!FLAG_watch_ic_patching) {
     ClearSampleBuffer();
   }
-  // If the ticker hasn't already started, make sure to do so to get
-  // the ticks for the runtime profiler.
-  if (IsEnabled()) isolate_->logger()->EnsureTickerStarted();
 }