--- a/hotspot/src/share/vm/runtime/os.cpp	Thu Mar 05 22:07:29 2009 -0500
+++ b/hotspot/src/share/vm/runtime/os.cpp	Mon Mar 09 11:32:57 2009 -0400
@@ -207,7 +207,8 @@
         VMThread::execute(&op1);
         Universe::print_heap_at_SIGBREAK();
         if (PrintClassHistogram) {
-          VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */);
+          VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */,
+                                   true /* need_prologue */);
           VMThread::execute(&op1);
         }
         if (JvmtiExport::should_post_data_dump()) {