Fix JS ratio computation on startup.

src/runtime-profiler.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 class Isolate;
 class JSFunction;
 class Object;
 class PendingListNode;
 class Semaphore;
 
-
-enum SamplerState {
-  IN_NON_JS_STATE = 0,
-  IN_JS_STATE = 1
-};
-
-
 class RuntimeProfiler {
  public:
   explicit RuntimeProfiler(Isolate* isolate);
 
   static bool IsEnabled();
 
   void OptimizeNow();
   void OptimizeSoon(JSFunction* function);
 
   void NotifyTick();
@@ skipping 34 matching lines @@
   static void WakeUpRuntimeProfilerThreadBeforeShutdown();
 
   void UpdateSamplesAfterScavenge();
   void RemoveDeadSamples();
   void UpdateSamplesAfterCompact(ObjectVisitor* visitor);
 
  private:
   static const int kSamplerWindowSize = 16;
   static const int kStateWindowSize = 128;
 
+  enum SamplerState {
+    IN_NON_JS_STATE = 0,
+    IN_JS_STATE = 1
+  };
+
   static void HandleWakeUp(Isolate* isolate);
 
   void Optimize(JSFunction* function, bool eager, int delay);
 
   void AttemptOnStackReplacement(JSFunction* function);
 
   void ClearSampleBuffer();
 
   void ClearSampleBufferNewSpaceEntries();
 
@@ skipping 16 matching lines @@
 
   Object* sampler_window_[kSamplerWindowSize];
   int sampler_window_position_;
   int sampler_window_weight_[kSamplerWindowSize];
 
   // Support for pending 'optimize soon' requests.
   PendingListNode* optimize_soon_list_;
 
   SamplerState state_window_[kStateWindowSize];
   int state_window_position_;
+  int state_window_ticks_;
   int state_counts_[2];
 
   // Possible state values:
   //   -1            => the profiler thread is waiting on the semaphore
   //   0 or positive => the number of isolates running JavaScript code.
   static Atomic32 state_;
   static Semaphore* semaphore_;
 };
 
 
@@ skipping 33 matching lines @@
 
 void RuntimeProfiler::IsolateExitedJS(Isolate* isolate) {
   Atomic32 new_state = NoBarrier_AtomicIncrement(&state_, -1);
   ASSERT(new_state >= 0);
   USE(new_state);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_PROFILER_H_