Remove shrinking of new space on compaction and only do it on idle...

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 2761)
+++ src/heap.cc	(working copy)
@@ -465,9 +465,9 @@
     old_gen_allocation_limit_ =
         old_gen_size + Max(kMinimumAllocationLimit, old_gen_size / 2);
     old_gen_exhausted_ = false;
-  } else {
-    Scavenge();
   }
+  Scavenge();
+
   Counters::objs_since_last_young.Set(0);
 
   PostGarbageCollectionProcessing();
@@ -521,12 +521,6 @@
 
   Counters::objs_since_last_full.Set(0);
   context_disposed_pending_ = false;
-
-  Scavenge();
-
-  // Shrink new space as much as possible after compacting full
-  // garbage collections.
-  if (is_compacting) new_space_.Shrink();
 }
 
 
@@ -2807,6 +2801,8 @@
     CollectAllGarbage(force_compaction);
     last_gc_count = gc_count_;
     if (force_compaction) {
+      // Shrink new space.
+      new_space_.Shrink();
       number_idle_notifications = 0;
       finished = true;
     }