Revert r16548 due to cpu profiler test falkiness

The change made cctest/test-cpu-profiler/CollectCpuProfile and cctest/test-cpu-profiler/JsNative1JsNative2JsSample flaky.

BUG=v8:2871
TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23615011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16553 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/cpu-profiler.cc

@@ -104,45 +104,49 @@ bool ProfilerEventsProcessor::ProcessCodeEvent() {
 }
 
 
-bool ProfilerEventsProcessor::ProcessOneSample() {
+bool ProfilerEventsProcessor::ProcessTicks() {
-  if (!ticks_from_vm_buffer_.IsEmpty()
+  while (true) {
+    while (!ticks_from_vm_buffer_.IsEmpty()
         && ticks_from_vm_buffer_.Peek()->order ==
            last_processed_code_event_id_) {
       TickSampleEventRecord record;
       ticks_from_vm_buffer_.Dequeue(&record);
       generator_->RecordTickSample(record.sample);
-    return false;
     }
 
     const TickSampleEventRecord* record = ticks_buffer_.Peek();
-  if (record == NULL) return true;
+    if (record == NULL) return !ticks_from_vm_buffer_.IsEmpty();
     if (record->order != last_processed_code_event_id_) return true;
     generator_->RecordTickSample(record->sample);
     ticks_buffer_.Remove();
-  return false;
+  }
+}
+
+
+void ProfilerEventsProcessor::ProcessEventsAndDoSample() {
+  ElapsedTimer timer;
+  timer.Start();
+  // Keep processing existing events until we need to do next sample.
+  while (!timer.HasExpired(period_)) {
+    if (ProcessTicks()) {
+      // All ticks of the current dequeue_order are processed,
+      // proceed to the next code event.
+      ProcessCodeEvent();
+    }
+  }
+  // Schedule next sample. sampler_ is NULL in tests.
+  if (sampler_) sampler_->DoSample();
 }
 
 
 void ProfilerEventsProcessor::Run() {
   while (running_) {
-    ElapsedTimer timer;
+    ProcessEventsAndDoSample();
-    timer.Start();
-    // Keep processing existing events until we need to do next sample.
-    do {
-      if (ProcessOneSample()) {
-        // All ticks of the current last_processed_code_event_id_ are
-        // processed, proceed to the next code event.
-        ProcessCodeEvent();
-      }
-    } while (!timer.HasExpired(period_));
-
-    // Schedule next sample. sampler_ is NULL in tests.
-    if (sampler_) sampler_->DoSample();
   }
 
   // Process remaining tick events.
   do {
-    while (!ProcessOneSample()) {}
+    ProcessTicks();
   } while (ProcessCodeEvent());
 }
 

src/cpu-profiler.h

@@ -161,7 +161,9 @@ class ProfilerEventsProcessor : public Thread {
  private:
   // Called from events processing thread (Run() method.)
   bool ProcessCodeEvent();
-  bool ProcessOneSample();
+  bool ProcessTicks();
+
+  void ProcessEventsAndDoSample();
 
   ProfileGenerator* generator_;
   Sampler* sampler_;