8005972: ParNew should not update the tenuring threshold when promotion failed has occurred

Reviewed-by: ysr, johnc, jwilhelm

hotspot/src/share/vm/gc_implementation/parNew/parNewGeneration.cpp

@@ -878,12 +878,6 @@ void EvacuateFollowersClosureGeneral::do_void() {
 
 bool ParNewGeneration::_avoid_promotion_undo = false;
 
-void ParNewGeneration::adjust_desired_tenuring_threshold() {
-  // Set the desired survivor size to half the real survivor space
-  _tenuring_threshold =
-    age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize);
-}
-
 // A Generation that does parallel young-gen collection.
 
 void ParNewGeneration::collect(bool   full,
@@ -1013,6 +1007,8 @@ void ParNewGeneration::collect(bool   full,
     size_policy->reset_gc_overhead_limit_count();
 
     assert(to()->is_empty(), "to space should be empty now");
+
+    adjust_desired_tenuring_threshold();
   } else {
     assert(_promo_failure_scan_stack.is_empty(), "post condition");
     _promo_failure_scan_stack.clear(true); // Clear cached segments.
@@ -1035,7 +1031,6 @@ void ParNewGeneration::collect(bool   full,
   from()->set_concurrent_iteration_safe_limit(from()->top());
   to()->set_concurrent_iteration_safe_limit(to()->top());
 
-  adjust_desired_tenuring_threshold();
   if (ResizePLAB) {
     plab_stats()->adjust_desired_plab_sz(n_workers);
   }

hotspot/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp

@@ -347,10 +347,6 @@ class ParNewGeneration: public DefNewGeneration {
   bool survivor_overflow() { return _survivor_overflow; }
   void set_survivor_overflow(bool v) { _survivor_overflow = v; }
 
-  // Adjust the tenuring threshold.  See the implementation for
-  // the details of the policy.
-  virtual void adjust_desired_tenuring_threshold();
-
  public:
   ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level);
 

hotspot/src/share/vm/memory/defNewGeneration.cpp

@@ -550,6 +550,11 @@ HeapWord* DefNewGeneration::expand_and_allocate(size_t size,
   return allocate(size, is_tlab);
 }
 
+void DefNewGeneration::adjust_desired_tenuring_threshold() {
+  // Set the desired survivor size to half the real survivor space
+  _tenuring_threshold =
+    age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize);
+}
 
 void DefNewGeneration::collect(bool   full,
                                bool   clear_all_soft_refs,
@@ -649,9 +654,7 @@ void DefNewGeneration::collect(bool   full,
 
     assert(to()->is_empty(), "to space should be empty now");
 
-    // Set the desired survivor size to half the real survivor space
-    _tenuring_threshold =
-      age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize);
+    adjust_desired_tenuring_threshold();
 
     // A successful scavenge should restart the GC time limit count which is
     // for full GC's.

hotspot/src/share/vm/memory/defNewGeneration.hpp

@@ -124,7 +124,9 @@ protected:
     _should_allocate_from_space = true;
   }
 
- protected:
+  // Tenuring
+  void adjust_desired_tenuring_threshold();
+
   // Spaces
   EdenSpace*       _eden_space;
   ContiguousSpace* _from_space;