Measure new space allocation 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_
 
 #include "src/base/platform/platform.h"
 
 namespace v8 {
@@ skipping 111 matching lines @@
 
    private:
     GCTracer* tracer_;
     ScopeId scope_;
     double start_time_;
 
     DISALLOW_COPY_AND_ASSIGN(Scope);
   };
 
 
+  class AllocationEvent {
+   public:
+    // Default constructor leaves the event uninitialized.
+    AllocationEvent() {}
+
+    AllocationEvent(double duration, intptr_t allocation_in_bytes);
+
+    // Time spent in the mutator during the end of the last garbage collection
+    // to the beginning of the next garbage collection.
+    double duration_;
+
+    // Memory allocated in the new space during the end of the last garbage
+    // collection to the beginning of the next garbage collection.
+    intptr_t allocation_in_bytes_;
+  };
+
   class Event {
    public:
     enum Type { SCAVENGER = 0, MARK_COMPACTOR = 1, START = 2 };
 
     // Default constructor leaves the event uninitialized.
     Event() {}
 
     Event(Type type, const char* gc_reason, const char* collector_reason);
 
     // Returns a string describing the event type.
@@ skipping 74 matching lines @@
     double longest_incremental_marking_step;
 
     // Amounts of time spent in different scopes during GC.
     double scopes[Scope::NUMBER_OF_SCOPES];
   };
 
   static const int kRingBufferMaxSize = 10;
 
   typedef RingBuffer<Event, kRingBufferMaxSize> EventBuffer;
 
+  typedef RingBuffer<AllocationEvent, kRingBufferMaxSize> AllocationEventBuffer;
+
   explicit GCTracer(Heap* heap);
 
   // Start collecting data.
   void Start(GarbageCollector collector, const char* gc_reason,
              const char* collector_reason);
 
   // Stop collecting data and print results.
   void Stop();
 
+  // Log an allocation throughput event.
+  void AddNewSpaceAllocationTime(double duration, intptr_t allocation_in_bytes);
+
   // Log an incremental marking step.
   void AddIncrementalMarkingStep(double duration, intptr_t bytes);
 
   // Log time spent in marking.
   void AddMarkingTime(double duration) {
     cumulative_marking_duration_ += duration;
   }
 
   // Time spent in marking.
   double cumulative_marking_duration() const {
@@ skipping 45 matching lines @@
   intptr_t IncrementalMarkingSpeedInBytesPerMillisecond() const;
 
   // Compute the average scavenge speed in bytes/millisecond.
   // Returns 0 if no events have been recorded.
   intptr_t ScavengeSpeedInBytesPerMillisecond() const;
 
   // Compute the max mark-sweep speed in bytes/millisecond.
   // Returns 0 if no events have been recorded.
   intptr_t MarkCompactSpeedInBytesPerMillisecond() const;
 
+  // Allocation throughput in the new space in bytes/millisecond.
+  // Returns 0 if no events have been recorded.
+  intptr_t NewSpaceAllocationThroughputInBytesPerMillisecond() 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 14 matching lines @@
 
   // Previous MARK_COMPACTOR event.
   Event previous_mark_compactor_event_;
 
   // RingBuffers for SCAVENGER events.
   EventBuffer scavenger_events_;
 
   // RingBuffers for MARK_COMPACTOR events.
   EventBuffer mark_compactor_events_;
 
+  // RingBuffer for allocation events.
+  AllocationEventBuffer allocation_events_;
+
   // Cumulative number of incremental marking steps since creation of tracer.
   int cumulative_incremental_marking_steps_;
 
   // Cumulative size of incremental marking steps (in bytes) since creation of
   // tracer.
   intptr_t cumulative_incremental_marking_bytes_;
 
   // Cumulative duration of incremental marking steps since creation of tracer.
   double cumulative_incremental_marking_duration_;
 
@@ skipping 10 matching lines @@
 
   // Total sweeping time on the main thread.
   // This timer is precise when run with --print-cumulative-gc-stat
   // TODO(hpayer): Account for sweeping time on sweeper threads. Add a
   // different field for that.
   // TODO(hpayer): This timer right now just holds the sweeping time
   // of the initial atomic sweeping pause. Make sure that it accumulates
   // all sweeping operations performed on the main thread.
   double cumulative_sweeping_duration_;
 
+  // Holds the new space top pointer recorded at the end of the last garbage
+  // collection.
+  intptr_t new_space_top_after_gc_;
+
   DISALLOW_COPY_AND_ASSIGN(GCTracer);
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_GC_TRACER_H_