Trace scavenger throughput.

src/heap/gc-tracer.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_GC_TRACER_H_
 #define V8_HEAP_GC_TRACER_H_
 
 namespace v8 {
 namespace internal {
 
@@ skipping 153 matching lines @@
     intptr_t end_memory_size;
 
     // Total amount of space either wasted or contained in one of free lists
     // before the current GC.
     intptr_t start_holes_size;
 
     // Total amount of space either wasted or contained in one of free lists
     // after the current GC.
     intptr_t end_holes_size;
 
+    // Size of new space objects in constructor.
+    intptr_t new_space_object_size;
+
     // Number of incremental marking steps since creation of tracer.
     // (value at start of event)
     int cumulative_incremental_marking_steps;
 
     // Incremental marking steps since
     // - last event for SCAVENGER events
     // - last MARK_COMPACTOR event for MARK_COMPACTOR events
     int incremental_marking_steps;
 
     // Bytes marked since creation of tracer (value at start of event).
@@ skipping 89 matching lines @@
   }
 
   // Compute the mean step duration of the last incremental marking round.
   // Returns 0 if no incremental marking round has been completed.
   double MeanIncrementalMarkingDuration() const;
 
   // Compute the max step duration of the last incremental marking round.
   // Returns 0 if no incremental marking round has been completed.
   double MaxIncrementalMarkingDuration() const;
 
-  // Compute the average incremental marking speed in bytes/second. Returns 0 if
-  // no events have been recorded.
+  // Compute the average incremental marking speed in bytes/millisecond.
+  // Returns 0 if no events have been recorded.
   intptr_t IncrementalMarkingSpeedInBytesPerMillisecond() const;
 
+  // Compute the average scavenge speed in bytes/millisecond.
+  // Returns 0 if no events have been recorded.
+  intptr_t ScavengeSpeedInBytesPerMillisecond() const;
+
  private:
   // Print one detailed trace line in name=value format.
   // TODO(ernstm): Move to Heap.
   void PrintNVP() const;
 
   // Print one trace line.
   // TODO(ernstm): Move to Heap.
   void Print() const;
 
   // Compute the mean duration of the events in the given ring buffer.
@@ skipping 50 matching lines @@
   // of the initial atomic sweeping pause. Make sure that it accumulates
   // all sweeping operations performed on the main thread.
   double cumulative_sweeping_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(GCTracer);
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_GC_TRACER_H_