Add histogram for total heap fragmentation, don't report fragmentation for new space, and report fr…

src/heap.cc

 // Copyright 2012 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 429 matching lines @@
 #endif
 
   isolate_->counters()->alive_after_last_gc()->Set(
       static_cast<int>(SizeOfObjects()));
 
   isolate_->counters()->symbol_table_capacity()->Set(
       symbol_table()->Capacity());
   isolate_->counters()->number_of_symbols()->Set(
       symbol_table()->NumberOfElements());
 
+  if (isolate()->memory_allocator()->Size() > 0) {
+    isolate_->counters()->external_fragmentation_total()->AddSample(
+        static_cast<int>(100 -
+            (SizeOfObjects() * 100) / isolate()->memory_allocator()->Size()));
+  }
+
 #define UPDATE_COUNTERS_FOR_SPACE(space)                                     \
   isolate_->counters()->space##_bytes_available()->Set(                      \
       static_cast<int>(space()->Available()));                               \
   isolate_->counters()->space##_bytes_committed()->Set(                      \
       static_cast<int>(space()->CommittedMemory()));                         \
   isolate_->counters()->space##_bytes_used()->Set(                           \
-      static_cast<int>(space()->SizeOfObjects()));                           \
+      static_cast<int>(space()->SizeOfObjects()));
+#define UPDATE_FRAGMENTATION_FOR_SPACE(space)                                \
   if (space()->CommittedMemory() > 0) {                                      \
     isolate_->counters()->external_fragmentation_##space()->AddSample(       \
-        static_cast<int>(                                                    \
+        static_cast<int>(100 -                                               \
             (space()->SizeOfObjects() * 100) / space()->CommittedMemory())); \
   }
+#define UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(space)                   \
+  UPDATE_COUNTERS_FOR_SPACE(space)                                           \
+  UPDATE_FRAGMENTATION_FOR_SPACE(space)
+
   UPDATE_COUNTERS_FOR_SPACE(new_space)
-  UPDATE_COUNTERS_FOR_SPACE(old_pointer_space)
-  UPDATE_COUNTERS_FOR_SPACE(old_data_space)
-  UPDATE_COUNTERS_FOR_SPACE(code_space)
-  UPDATE_COUNTERS_FOR_SPACE(map_space)
-  UPDATE_COUNTERS_FOR_SPACE(cell_space)
-  UPDATE_COUNTERS_FOR_SPACE(lo_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(old_pointer_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(old_data_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(code_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(map_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(cell_space)
+  UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE(lo_space)
 #undef UPDATE_COUNTERS_FOR_SPACE
+#undef UPDATE_FRAGMENTATION_FOR_SPACE
+#undef UPDATE_COUNTERS_AND_FRAGMENTATION_FOR_SPACE
 
 #if defined(DEBUG)
   ReportStatisticsAfterGC();
 #endif  // DEBUG
 #ifdef ENABLE_DEBUGGER_SUPPORT
   isolate_->debug()->AfterGarbageCollection();
 #endif  // ENABLE_DEBUGGER_SUPPORT
 }
 
 
@@ skipping 6744 matching lines @@
   INSTANCE_TYPE_LIST(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
   memcpy(object_counts_last_time_, object_counts_,
          sizeof(object_counts_));
   memcpy(object_sizes_last_time_, object_sizes_,
          sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal