diff -r 97fbf5beff7b -r 8b10f48633dc src/share/vm/gc_implementation/parallelScavenge/pcTasks.hpp
--- a/src/share/vm/gc_implementation/parallelScavenge/pcTasks.hpp	Thu Sep 16 13:45:55 2010 -0700
+++ b/src/share/vm/gc_implementation/parallelScavenge/pcTasks.hpp	Mon Sep 20 14:38:38 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -242,7 +242,11 @@
 //
 
 class DrainStacksCompactionTask : public GCTask {
+ uint _stack_index;
+ uint stack_index() { return _stack_index; }
  public:
+  DrainStacksCompactionTask(uint stack_index) : GCTask(),
+                                                _stack_index(stack_index) {};
   char* name() { return (char *)"drain-region-task"; }
   virtual void do_it(GCTaskManager* manager, uint which);
 };