--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -3006,7 +3006,10 @@
 
     if (failures) {
       gclog_or_tty->print_cr("Heap:");
-      print_on(gclog_or_tty, true /* extended */);
+      // It helps to have the per-region information in the output to
+      // help us track down what went wrong. This is why we call
+      // print_extended_on() instead of print_on().
+      print_extended_on(gclog_or_tty);
       gclog_or_tty->print_cr("");
 #ifndef PRODUCT
       if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) {
@@ -3032,13 +3035,7 @@
   }
 };
 
-void G1CollectedHeap::print() const { print_on(tty); }
-
 void G1CollectedHeap::print_on(outputStream* st) const {
-  print_on(st, PrintHeapAtGCExtended);
-}
-
-void G1CollectedHeap::print_on(outputStream* st, bool extended) const {
   st->print(" %-20s", "garbage-first heap");
   st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
             capacity()/K, used_unlocked()/K);
@@ -3056,13 +3053,14 @@
             survivor_regions, survivor_regions * HeapRegion::GrainBytes / K);
   st->cr();
   perm()->as_gen()->print_on(st);
-  if (extended) {
-    st->cr();
-    print_on_extended(st);
-  }
-}
-
-void G1CollectedHeap::print_on_extended(outputStream* st) const {
+}
+
+void G1CollectedHeap::print_extended_on(outputStream* st) const {
+  print_on(st);
+
+  // Print the per-region information.
+  st->cr();
+  st->print_cr("Heap Regions: (Y=young(eden), SU=young(survivor), HS=humongous(starts), HC=humongous(continues), CS=collection set, F=free, TS=gc time stamp, PTAMS=previous top-at-mark-start, NTAMS=next top-at-mark-start)");
   PrintRegionClosure blk(st);
   heap_region_iterate(&blk);
 }

--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Tue Nov 08 00:41:28 2011 -0500
@@ -1449,14 +1449,8 @@
 
   // Override; it uses the "prev" marking information
   virtual void verify(bool allow_dirty, bool silent);
-  // Default behavior by calling print(tty);
-  virtual void print() const;
-  // This calls print_on(st, PrintHeapAtGCExtended).
   virtual void print_on(outputStream* st) const;
-  // If extended is true, it will print out information for all
-  // regions in the heap by calling print_on_extended(st).
-  virtual void print_on(outputStream* st, bool extended) const;
-  virtual void print_on_extended(outputStream* st) const;
+  virtual void print_extended_on(outputStream* st) const;
 
   virtual void print_gc_threads_on(outputStream* st) const;
   virtual void gc_threads_do(ThreadClosure* tc) const;

--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -722,7 +722,7 @@
     st->print(" F");
   else
     st->print("  ");
-  st->print(" %5d", _gc_time_stamp);
+  st->print(" TS %5d", _gc_time_stamp);
   st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT,
             prev_top_at_mark_start(), next_top_at_mark_start());
   G1OffsetTableContigSpace::print_on(st);

--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -863,8 +863,6 @@
   ensure_parsability(false);  // no need to retire TLABs for verification
 }
 
-void ParallelScavengeHeap::print() const { print_on(tty); }
-
 void ParallelScavengeHeap::print_on(outputStream* st) const {
   young_gen()->print_on(st);
   old_gen()->print_on(st);

--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp	Tue Nov 08 00:41:28 2011 -0500
@@ -246,8 +246,7 @@
   jlong millis_since_last_gc();
 
   void prepare_for_verify();
-  void print() const;
-  void print_on(outputStream* st) const;
+  virtual void print_on(outputStream* st) const;
   virtual void print_gc_threads_on(outputStream* st) const;
   virtual void gc_threads_do(ThreadClosure* tc) const;
   virtual void print_tracing_info() const;

--- a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp	Tue Nov 08 00:41:28 2011 -0500
@@ -590,13 +590,27 @@
   void pre_full_gc_dump();
   void post_full_gc_dump();
 
-  virtual void print() const = 0;
+  // Print heap information on the given outputStream.
   virtual void print_on(outputStream* st) const = 0;
+  // The default behavior is to call print_on() on tty.
+  virtual void print() const {
+    print_on(tty);
+  }
+  // Print more detailed heap information on the given
+  // outputStream. The default behaviour is to call print_on(). It is
+  // up to each subclass to override it and add any additional output
+  // it needs.
+  virtual void print_extended_on(outputStream* st) const {
+    print_on(st);
+  }
 
   // Print all GC threads (other than the VM thread)
   // used by this heap.
   virtual void print_gc_threads_on(outputStream* st) const = 0;
-  void print_gc_threads() { print_gc_threads_on(tty); }
+  // The default behavior is to call print_gc_threads_on() on tty.
+  void print_gc_threads() {
+    print_gc_threads_on(tty);
+  }
   // Iterator for all GC threads (other than VM thread)
   virtual void gc_threads_do(ThreadClosure* tc) const = 0;
 

--- a/hotspot/src/share/vm/memory/genCollectedHeap.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -1270,7 +1270,6 @@
   rem_set()->verify();
 }
 
-void GenCollectedHeap::print() const { print_on(tty); }
 void GenCollectedHeap::print_on(outputStream* st) const {
   for (int i = 0; i < _n_gens; i++) {
     _gens[i]->print_on(st);

--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Tue Nov 08 00:41:28 2011 -0500
@@ -360,8 +360,7 @@
   void verify(bool allow_dirty, bool silent, VerifyOption option);
 
   // Override.
-  void print() const;
-  void print_on(outputStream* st) const;
+  virtual void print_on(outputStream* st) const;
   virtual void print_gc_threads_on(outputStream* st) const;
   virtual void gc_threads_do(ThreadClosure* tc) const;
   virtual void print_tracing_info() const;

--- a/hotspot/src/share/vm/memory/universe.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/memory/universe.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -1281,11 +1281,17 @@
   }
 }
 
-void Universe::print() { print_on(gclog_or_tty); }
+void Universe::print() {
+  print_on(gclog_or_tty);
+}
 
-void Universe::print_on(outputStream* st) {
+void Universe::print_on(outputStream* st, bool extended) {
   st->print_cr("Heap");
-  heap()->print_on(st);
+  if (!extended) {
+    heap()->print_on(st);
+  } else {
+    heap()->print_extended_on(st);
+  }
 }
 
 void Universe::print_heap_at_SIGBREAK() {
@@ -1301,14 +1307,22 @@
   st->print_cr("{Heap before GC invocations=%u (full %u):",
                heap()->total_collections(),
                heap()->total_full_collections());
-  heap()->print_on(st);
+  if (!PrintHeapAtGCExtended) {
+    heap()->print_on(st);
+  } else {
+    heap()->print_extended_on(st);
+  }
 }
 
 void Universe::print_heap_after_gc(outputStream* st) {
   st->print_cr("Heap after GC invocations=%u (full %u):",
                heap()->total_collections(),
                heap()->total_full_collections());
-  heap()->print_on(st);
+  if (!PrintHeapAtGCExtended) {
+    heap()->print_on(st);
+  } else {
+    heap()->print_extended_on(st);
+  }
   st->print_cr("}");
 }
 

--- a/hotspot/src/share/vm/memory/universe.hpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/memory/universe.hpp	Tue Nov 08 00:41:28 2011 -0500
@@ -414,9 +414,13 @@
   static bool verify_in_progress() { return _verify_in_progress; }
   static void verify(bool allow_dirty = true, bool silent = false,
                      VerifyOption option = VerifyOption_Default );
-  static int  verify_count()                  { return _verify_count; }
+  static int  verify_count()       { return _verify_count; }
+  // The default behavior is to call print_on() on gclog_or_tty.
   static void print();
-  static void print_on(outputStream* st);
+  // The extended parameter determines which method on the heap will
+  // be called: print_on() (extended == false) or print_extended_on()
+  // (extended == true).
+  static void print_on(outputStream* st, bool extended = false);
   static void print_heap_at_SIGBREAK();
   static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }
   static void print_heap_after_gc()  { print_heap_after_gc(gclog_or_tty); }

--- a/hotspot/src/share/vm/utilities/vmError.cpp	Mon Nov 07 22:11:12 2011 -0500
+++ b/hotspot/src/share/vm/utilities/vmError.cpp	Tue Nov 08 00:41:28 2011 -0500
@@ -680,8 +680,10 @@
   STEP(190, "(printing heap information)" )
 
      if (_verbose && Universe::is_fully_initialized()) {
-       // print heap information before vm abort
-       Universe::print_on(st);
+       // Print heap information before vm abort. As we'd like as much
+       // information as possible in the report we ask for the
+       // extended (i.e., more detailed) version.
+       Universe::print_on(st, true /* extended */);
        st->cr();
      }