Add accumulator to allocation profiler

runtime/vm/class_table.h

Index: runtime/vm/class_table.h
diff --git a/runtime/vm/class_table.h b/runtime/vm/class_table.h
index c20e1b70665b6ca71fe444fb99bfffcdacecbddc..fca69d4979c8c96cebd1aa684a5d203ef297bfb0 100644
--- a/runtime/vm/class_table.h
+++ b/runtime/vm/class_table.h
@@ -38,6 +38,18 @@ class ClassHeapStats {
   intptr_t allocated_size_since_gc_new_space;
   intptr_t allocated_size_since_gc_old_space;
 
+  // Accumulator.
+  int64_t accumulated_post_gc_new_space;
+  int64_t accumulated_post_gc_old_space;
+  int64_t accumulated_post_gc_size_new_space;
+  int64_t accumulated_post_gc_size_old_space;
+
+  // Offset used when zeroing accumulators.
+  intptr_t accumulator_new_space_offset;
+  intptr_t accumulator_old_space_offset;
+  intptr_t accumulator_size_new_space_offset;
+  intptr_t accumulator_size_old_space_offset;

[turnidge, 2014/02/27 18:29:13]

 Notes from our offline discussion:

struct AllocStats {
  intptr_t old_count;
  intptr_t new_count;
  intptr_t old_size;
  intptr_t new_size;

  AddOld(intptr_t sz);
  AddNew(intptr_t sz);
  Reset();
}

AllocStats pre_gc;
AllocStats post_gc;

AllocStats recent;
AllocStats accumulated;
AllocStats last_reset;

[Cutch, 2014/02/27 21:50:33]

Done.

+
   static intptr_t allocated_since_gc_new_space_offset() {
     return OFFSET_OF(ClassHeapStats, allocated_since_gc_new_space);
   }
@@ -54,6 +66,7 @@ class ClassHeapStats {
   void Initialize();
   void ResetAtNewGC();
   void ResetAtOldGC();
+  void ResetAccumulator();
   void UpdateSize(intptr_t instance_size);
   void PrintTOJSONArray(const Class& cls, JSONArray* array);
 };
@@ -113,6 +126,7 @@ class ClassTable {
 
 
   void AllocationProfilePrintToJSONStream(JSONStream* stream);
+  void ResetAllocationAccumulators();
 
  private:
   friend class MarkingVisitor;