--- a/src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp	Wed Apr 11 16:18:45 2012 +0200
+++ b/src/share/vm/gc_implementation/g1/g1MonitoringSupport.cpp	Wed Apr 18 07:21:15 2012 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2012 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2012, 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
@@ -177,19 +177,19 @@
   // values we read here are possible (i.e., at a STW phase at the end
   // of a GC).
 
-  size_t young_list_length = g1->young_list()->length();
-  size_t survivor_list_length = g1->g1_policy()->recorded_survivor_regions();
+  uint young_list_length = g1->young_list()->length();
+  uint survivor_list_length = g1->g1_policy()->recorded_survivor_regions();
   assert(young_list_length >= survivor_list_length, "invariant");
-  size_t eden_list_length = young_list_length - survivor_list_length;
+  uint eden_list_length = young_list_length - survivor_list_length;
   // Max length includes any potential extensions to the young gen
   // we'll do when the GC locker is active.
-  size_t young_list_max_length = g1->g1_policy()->young_list_max_length();
+  uint young_list_max_length = g1->g1_policy()->young_list_max_length();
   assert(young_list_max_length >= survivor_list_length, "invariant");
-  size_t eden_list_max_length = young_list_max_length - survivor_list_length;
+  uint eden_list_max_length = young_list_max_length - survivor_list_length;
 
   _overall_used = g1->used_unlocked();
-  _eden_used = eden_list_length * HeapRegion::GrainBytes;
-  _survivor_used = survivor_list_length * HeapRegion::GrainBytes;
+  _eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
+  _survivor_used = (size_t) survivor_list_length * HeapRegion::GrainBytes;
   _young_region_num = young_list_length;
   _old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used);
 
@@ -207,7 +207,7 @@
   committed -= _survivor_committed + _old_committed;
 
   // Next, calculate and remove the committed size for the eden.
-  _eden_committed = eden_list_max_length * HeapRegion::GrainBytes;
+  _eden_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
   // Somewhat defensive: be robust in case there are inaccuracies in
   // the calculations
   _eden_committed = MIN2(_eden_committed, committed);
@@ -237,10 +237,10 @@
   // When a new eden region is allocated, only the eden_used size is
   // affected (since we have recalculated everything else at the last GC).
 
-  size_t young_region_num = g1h()->young_list()->length();
+  uint young_region_num = g1h()->young_list()->length();
   if (young_region_num > _young_region_num) {
-    size_t diff = young_region_num - _young_region_num;
-    _eden_used += diff * HeapRegion::GrainBytes;
+    uint diff = young_region_num - _young_region_num;
+    _eden_used += (size_t) diff * HeapRegion::GrainBytes;
     // Somewhat defensive: cap the eden used size to make sure it
     // never exceeds the committed size.
     _eden_used = MIN2(_eden_used, _eden_committed);