Add histograms for total allocated/live heap size, as well as allocated size and percentage of tota…

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 48cf266826dd53b6dae18a328a1959c206c12eb7..ff5328fd99bbd8ce56cbcad319b4afe245b0ec49 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -453,6 +453,20 @@ void Heap::GarbageCollectionEpilogue() {
   if (CommittedMemory() > 0) {
     isolate_->counters()->external_fragmentation_total()->AddSample(
         static_cast<int>(100 - (SizeOfObjects() * 100.0) / CommittedMemory()));
+
+    isolate_->counters()->map_space_fraction_of_total()->AddSample(
+        static_cast<int>(
+            (map_space()->CommittedMemory() * 100.0) / CommittedMemory()));
+    isolate_->counters()->cell_space_fraction_of_total()->AddSample(
+        static_cast<int>(
+            (cell_space()->CommittedMemory() * 100.0) / CommittedMemory()));
+
+    isolate_->counters()->total_heap_size()->AddSample(CommittedMemory() / KB);

[Michael Starzinger, 2012/08/08 18:44:36]

It doesn't make much of a difference, but we could sample these last four
numbers even if CommittedMemory() == 0.

[jochen (gone - plz use gerrit), 2012/08/09 13:31:29]

We'd just keep adding 0 samples (probably during startup or so)

+    isolate_->counters()->live_heap_size()->AddSample(SizeOfObjects() / KB);
+    isolate_->counters()->total_map_space_size()->AddSample(
+        map_space()->CommittedMemory() / KB);
+    isolate_->counters()->total_cell_space_size()->AddSample(
+        cell_space()->CommittedMemory() / KB);
   }
 
 #define UPDATE_COUNTERS_FOR_SPACE(space)                                       \