diff --git a/.hgtags b/.hgtags
index 1b6f676bfa9756c6cdb8da4f3a01aad3dfbc08f7..c5fad07f840047d38bc855dfff99a2996a388137 100644
--- a/.hgtags
+++ b/.hgtags
@@ -414,3 +414,4 @@ c89630a122b43d0eabd78b74f6498a1c3cf04ca3 hs25.20-b00
 df333ee12bba67e2e928f8ce1da37afd9bf95b48 jdk8-b124
 412d3b5fe90e54c0ff9d9ac7374b98607c561d5a hs25.20-b01
 4638c4d7ff106db0f29ef7f18b128dd7e69bc470 hs25.20-b02
+e56d11f8cc2158d4280f80e56d196193349c150a hs25.20-b03
diff --git a/make/hotspot_version b/make/hotspot_version
index 214ce6e99197043354ab2cf30f0739cc70256187..5677417e31c82038c795f2256cb11b819f49be4b 100644
--- a/make/hotspot_version
+++ b/make/hotspot_version
@@ -35,7 +35,7 @@ HOTSPOT_VM_COPYRIGHT=Copyright 2014
 
 HS_MAJOR_VER=25
 HS_MINOR_VER=20
-HS_BUILD_NUMBER=02
+HS_BUILD_NUMBER=03
 
 JDK_MAJOR_VER=1
 JDK_MINOR_VER=8
diff --git a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
index 6ed0244214b28ec7b88fae6cb4509d232413066e..64b2995af27fd9eed9e58d1f354b03dff410b0cb 100644
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2014, 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
@@ -1575,8 +1575,6 @@ void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) {
 void
 G1CollectedHeap::
 resize_if_necessary_after_full_collection(size_t word_size) {
-  assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check");
-
   // Include the current allocation, if any, and bytes that will be
   // pre-allocated to support collections, as "used".
   const size_t used_after_gc = used();
@@ -5212,9 +5210,12 @@ private:
   bool  _process_symbols;
   int _symbols_processed;
   int _symbols_removed;
+
+  bool _do_in_parallel;
 public:
   G1StringSymbolTableUnlinkTask(BoolObjectClosure* is_alive, bool process_strings, bool process_symbols) :
     AbstractGangTask("Par String/Symbol table unlink"), _is_alive(is_alive),
+    _do_in_parallel(G1CollectedHeap::use_parallel_gc_threads()),
     _process_strings(process_strings), _strings_processed(0), _strings_removed(0),
     _process_symbols(process_symbols), _symbols_processed(0), _symbols_removed(0) {
 
@@ -5229,16 +5230,16 @@ public:
   }
 
   ~G1StringSymbolTableUnlinkTask() {
-    guarantee(!_process_strings || StringTable::parallel_claimed_index() >= _initial_string_table_size,
+    guarantee(!_process_strings || !_do_in_parallel || StringTable::parallel_claimed_index() >= _initial_string_table_size,
               err_msg("claim value "INT32_FORMAT" after unlink less than initial string table size "INT32_FORMAT,
                       StringTable::parallel_claimed_index(), _initial_string_table_size));
-    guarantee(!_process_strings || SymbolTable::parallel_claimed_index() >= _initial_symbol_table_size,
+    guarantee(!_process_symbols || !_do_in_parallel || SymbolTable::parallel_claimed_index() >= _initial_symbol_table_size,
               err_msg("claim value "INT32_FORMAT" after unlink less than initial symbol table size "INT32_FORMAT,
                       SymbolTable::parallel_claimed_index(), _initial_symbol_table_size));
   }
 
   void work(uint worker_id) {
-    if (G1CollectedHeap::use_parallel_gc_threads()) {
+    if (_do_in_parallel) {
       int strings_processed = 0;
       int strings_removed = 0;
       int symbols_processed = 0;
diff --git a/src/share/vm/gc_implementation/g1/g1OopClosures.hpp b/src/share/vm/gc_implementation/g1/g1OopClosures.hpp
index 414b82f95bcf98cbbd49e28affc9a2fd82466fc2..bda11dc6b98fbb1b31ce73301e92282f85181f42 100644
--- a/src/share/vm/gc_implementation/g1/g1OopClosures.hpp
+++ b/src/share/vm/gc_implementation/g1/g1OopClosures.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2014, 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
@@ -86,13 +86,26 @@ public:
 
 #define G1_PARTIAL_ARRAY_MASK 0x2
 
-template <class T> inline bool has_partial_array_mask(T* ref) {
+inline bool has_partial_array_mask(oop* ref) {
   return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
 }
 
-template <class T> inline T* set_partial_array_mask(T obj) {
+// We never encode partial array oops as narrowOop*, so return false immediately.
+// This allows the compiler to create optimized code when popping references from
+// the work queue.
+inline bool has_partial_array_mask(narrowOop* ref) {
+  assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
+  return false;
+}
+
+// Only implement set_partial_array_mask() for regular oops, not for narrowOops.
+// We always encode partial arrays as regular oop, to allow the
+// specialization for has_partial_array_mask() for narrowOops above.
+// This means that unintentional use of this method with narrowOops are caught
+// by the compiler.
+inline oop* set_partial_array_mask(oop obj) {
   assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
-  return (T*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
+  return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
 }
 
 template <class T> inline oop clear_partial_array_mask(T* ref) {
diff --git a/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp b/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp
index a2f2fa722bf0ce752448f09f839cbd382779db9c..0fb87664ec65196a527b6d7cd616a32474a23070 100644
--- a/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp
+++ b/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "precompiled.hpp"
+#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp"
 #include "gc_implementation/parallelScavenge/psGCAdaptivePolicyCounters.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
@@ -76,6 +77,38 @@ PSAdaptiveSizePolicy::PSAdaptiveSizePolicy(size_t init_eden_size,
   _old_gen_policy_is_ready = false;
 }
 
+size_t PSAdaptiveSizePolicy::calculate_free_based_on_live(size_t live, uintx ratio_as_percentage) {
+  // We want to calculate how much free memory there can be based on the
+  // amount of live data currently in the old gen. Using the formula:
+  // ratio * (free + live) = free
+  // Some equation solving later we get:
+  // free = (live * ratio) / (1 - ratio)
+
+  const double ratio = ratio_as_percentage / 100.0;
+  const double ratio_inverse = 1.0 - ratio;
+  const double tmp = live * ratio;
+  size_t free = (size_t)(tmp / ratio_inverse);
+
+  return free;
+}
+
+size_t PSAdaptiveSizePolicy::calculated_old_free_size_in_bytes() const {
+  size_t free_size = (size_t)(_promo_size + avg_promoted()->padded_average());
+  size_t live = ParallelScavengeHeap::heap()->old_gen()->used_in_bytes();
+
+  if (MinHeapFreeRatio != 0) {
+    size_t min_free = calculate_free_based_on_live(live, MinHeapFreeRatio);
+    free_size = MAX2(free_size, min_free);
+  }
+
+  if (MaxHeapFreeRatio != 100) {
+    size_t max_free = calculate_free_based_on_live(live, MaxHeapFreeRatio);
+    free_size = MIN2(max_free, free_size);
+  }
+
+  return free_size;
+}
+
 void PSAdaptiveSizePolicy::major_collection_begin() {
   // Update the interval time
   _major_timer.stop();
@@ -1292,3 +1325,18 @@ bool PSAdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st)
                           st,
                           PSScavenge::tenuring_threshold());
 }
+
+#ifndef PRODUCT
+
+void TestOldFreeSpaceCalculation_test() {
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 20) == 25, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 50) == 100, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 60) == 150, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(100, 75) == 300, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 20) == 100, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 50) == 400, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 60) == 600, "Calculation of free memory failed");
+  assert(PSAdaptiveSizePolicy::calculate_free_based_on_live(400, 75) == 1200, "Calculation of free memory failed");
+}
+
+#endif /* !PRODUCT */
diff --git a/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp b/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp
index 3389911876f74227675adea71971d2ecea484c31..5cea21ae2bc3f010437e414d66d97920a03fb43d 100644
--- a/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp
+++ b/src/share/vm/gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp
@@ -240,7 +240,6 @@ class PSAdaptiveSizePolicy : public AdaptiveSizePolicy {
   void major_collection_begin();
   void major_collection_end(size_t amount_live, GCCause::Cause gc_cause);
 
-  //
   void tenured_allocation(size_t size) {
     _avg_pretenured->sample(size);
   }
@@ -248,9 +247,9 @@ class PSAdaptiveSizePolicy : public AdaptiveSizePolicy {
   // Accessors
   // NEEDS_CLEANUP   should use sizes.hpp
 
-  size_t calculated_old_free_size_in_bytes() const {
-    return (size_t)(_promo_size + avg_promoted()->padded_average());
-  }
+  static size_t calculate_free_based_on_live(size_t live, uintx ratio_as_percentage);
+
+  size_t calculated_old_free_size_in_bytes() const;
 
   size_t average_old_live_in_bytes() const {
     return (size_t) avg_old_live()->average();
diff --git a/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp b/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
index 8f47d582fd60bebc9488c9b3359a1e6f148381ed..1bc0cd5f8a97eaec4783492a1b2a92ad5c5e2edd 100644
--- a/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
+++ b/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
@@ -529,8 +529,19 @@ bool PSScavenge::invoke_no_policy() {
           counters->update_survivor_overflowed(_survivor_overflow);
         }
 
+        size_t max_young_size = young_gen->max_size();
+
+        // Deciding a free ratio in the young generation is tricky, so if
+        // MinHeapFreeRatio or MaxHeapFreeRatio are in use (implicating
+        // that the old generation size may have been limited because of them) we
+        // should then limit our young generation size using NewRatio to have it
+        // follow the old generation size.
+        if (MinHeapFreeRatio != 0 || MaxHeapFreeRatio != 100) {
+          max_young_size = MIN2(old_gen->capacity_in_bytes() / NewRatio, young_gen->max_size());
+        }
+
         size_t survivor_limit =
-          size_policy->max_survivor_size(young_gen->max_size());
+          size_policy->max_survivor_size(max_young_size);
         _tenuring_threshold =
           size_policy->compute_survivor_space_size_and_threshold(
                                                            _survivor_overflow,
@@ -553,8 +564,7 @@ bool PSScavenge::invoke_no_policy() {
         // Do call at minor collections?
         // Don't check if the size_policy is ready at this
         // level.  Let the size_policy check that internally.
-        if (UseAdaptiveSizePolicy &&
-            UseAdaptiveGenerationSizePolicyAtMinorCollection &&
+        if (UseAdaptiveGenerationSizePolicyAtMinorCollection &&
             ((gc_cause != GCCause::_java_lang_system_gc) ||
               UseAdaptiveSizePolicyWithSystemGC)) {
 
@@ -568,7 +578,7 @@ bool PSScavenge::invoke_no_policy() {
           size_t eden_live = young_gen->eden_space()->used_in_bytes();
           size_t cur_eden = young_gen->eden_space()->capacity_in_bytes();
           size_t max_old_gen_size = old_gen->max_gen_size();
-          size_t max_eden_size = young_gen->max_size() -
+          size_t max_eden_size = max_young_size -
             young_gen->from_space()->capacity_in_bytes() -
             young_gen->to_space()->capacity_in_bytes();
 
diff --git a/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp b/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
index 6bc8ef7375305e704df5dabb670b681e4224e211..e3da6bdf2b85990456d9433e2192c6897362df04 100644
--- a/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
+++ b/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
@@ -127,7 +127,7 @@ class PSYoungGen : public CHeapObj<mtGC> {
   void adjust_pointers();
   void compact();
 
-  // Called during/after gc
+  // Called during/after GC
   void swap_spaces();
 
   // Resize generation using suggested free space size and survivor size
@@ -146,14 +146,14 @@ class PSYoungGen : public CHeapObj<mtGC> {
   size_t free_in_words() const;
 
   // The max this generation can grow to
-  size_t max_size() const            { return _reserved.byte_size(); }
+  size_t max_size() const { return _reserved.byte_size(); }
 
   // The max this generation can grow to if the boundary between
   // the generations are allowed to move.
   size_t gen_size_limit() const { return _max_gen_size; }
 
   bool is_maximal_no_gc() const {
-    return true;  // never expands except at a GC
+    return true;  // Never expands except at a GC
   }
 
   // Allocation
diff --git a/src/share/vm/prims/jni.cpp b/src/share/vm/prims/jni.cpp
index ab24446baf19056fb1a80dddaa3d475e85ced385..4f8f063b3954d26c57119ff9e0a26c154896b780 100644
--- a/src/share/vm/prims/jni.cpp
+++ b/src/share/vm/prims/jni.cpp
@@ -5061,6 +5061,7 @@ void TestVirtualSpace_test();
 void TestMetaspaceAux_test();
 void TestMetachunk_test();
 void TestVirtualSpaceNode_test();
+void TestOldFreeSpaceCalculation_test();
 #if INCLUDE_ALL_GCS
 void TestG1BiasedArray_test();
 #endif
@@ -5081,6 +5082,7 @@ void execute_internal_vm_tests() {
     run_unit_test(QuickSort::test_quick_sort());
     run_unit_test(AltHashing::test_alt_hash());
     run_unit_test(test_loggc_filename());
+    run_unit_test(TestOldFreeSpaceCalculation_test());
 #if INCLUDE_VM_STRUCTS
     run_unit_test(VMStructs::test());
 #endif
diff --git a/src/share/vm/runtime/arguments.cpp b/src/share/vm/runtime/arguments.cpp
index 2769eece6095d1e6b873c464dec95dc1ad6d7328..2d7c5851fad3f71d29c82e6f563ec2d7da9c887b 100644
--- a/src/share/vm/runtime/arguments.cpp
+++ b/src/share/vm/runtime/arguments.cpp
@@ -1569,6 +1569,16 @@ void Arguments::set_parallel_gc_flags() {
     vm_exit(1);
   }
 
+  if (UseAdaptiveSizePolicy) {
+    // We don't want to limit adaptive heap sizing's freedom to adjust the heap
+    // unless the user actually sets these flags.
+    if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
+      FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
+    }
+    if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
+      FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
+    }
+  }
 
   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
@@ -1844,7 +1854,7 @@ bool Arguments::verify_min_value(intx val, intx min, const char* name) {
 }
 
 bool Arguments::verify_percentage(uintx value, const char* name) {
-  if (value <= 100) {
+  if (is_percentage(value)) {
     return true;
   }
   jio_fprintf(defaultStream::error_stream(),
@@ -1932,6 +1942,34 @@ bool is_filename_valid(const char *file_name) {
   return count_p < 2 && count_t < 2;
 }
 
+bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
+  if (!is_percentage(min_heap_free_ratio)) {
+    err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
+    return false;
+  }
+  if (min_heap_free_ratio > MaxHeapFreeRatio) {
+    err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
+                  "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
+                  MaxHeapFreeRatio);
+    return false;
+  }
+  return true;
+}
+
+bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
+  if (!is_percentage(max_heap_free_ratio)) {
+    err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
+    return false;
+  }
+  if (max_heap_free_ratio < MinHeapFreeRatio) {
+    err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
+                  "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
+                  MinHeapFreeRatio);
+    return false;
+  }
+  return true;
+}
+
 // Check consistency of GC selection
 bool Arguments::check_gc_consistency() {
   check_gclog_consistency();
@@ -2037,8 +2075,6 @@ bool Arguments::check_vm_args_consistency() {
   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
                               "AdaptiveSizePolicyWeight");
   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
-  status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
-  status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
 
   // Divide by bucket size to prevent a large size from causing rollover when
   // calculating amount of memory needed to be allocated for the String table.
@@ -2048,15 +2084,19 @@ bool Arguments::check_vm_args_consistency() {
   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
 
-  if (MinHeapFreeRatio > MaxHeapFreeRatio) {
-    jio_fprintf(defaultStream::error_stream(),
-                "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
-                "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
-                MinHeapFreeRatio, MaxHeapFreeRatio);
-    status = false;
+  {
+    // Using "else if" below to avoid printing two error messages if min > max.
+    // This will also prevent us from reporting both min>100 and max>100 at the
+    // same time, but that is less annoying than printing two identical errors IMHO.
+    FormatBuffer<80> err_msg("");
+    if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
+      jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
+      status = false;
+    } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
+      jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
+      status = false;
+    }
   }
-  // Keeping the heap 100% free is hard ;-) so limit it to 99%.
-  MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
 
   // Min/MaxMetaspaceFreeRatio
   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
@@ -2689,7 +2729,7 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
     } else if (match_option(option, "-Xmaxf", &tail)) {
       char* err;
       int maxf = (int)(strtod(tail, &err) * 100);
-      if (*err != '\0' || maxf < 0 || maxf > 100) {
+      if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
         jio_fprintf(defaultStream::error_stream(),
                     "Bad max heap free percentage size: %s\n",
                     option->optionString);
@@ -2701,7 +2741,7 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
     } else if (match_option(option, "-Xminf", &tail)) {
       char* err;
       int minf = (int)(strtod(tail, &err) * 100);
-      if (*err != '\0' || minf < 0 || minf > 100) {
+      if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
         jio_fprintf(defaultStream::error_stream(),
                     "Bad min heap free percentage size: %s\n",
                     option->optionString);
@@ -3646,9 +3686,9 @@ jint Arguments::apply_ergo() {
   // Set per-collector flags
   if (UseParallelGC || UseParallelOldGC) {
     set_parallel_gc_flags();
-  } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
+  } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
     set_cms_and_parnew_gc_flags();
-  } else if (UseParNewGC) {  // skipped if CMS is set above
+  } else if (UseParNewGC) {  // Skipped if CMS is set above
     set_parnew_gc_flags();
   } else if (UseG1GC) {
     set_g1_gc_flags();
@@ -3662,6 +3702,10 @@ jint Arguments::apply_ergo() {
               " using -XX:ParallelGCThreads=N");
     }
   }
+  if (MinHeapFreeRatio == 100) {
+    // Keeping the heap 100% free is hard ;-) so limit it to 99%.
+    FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
+  }
 #else // INCLUDE_ALL_GCS
   assert(verify_serial_gc_flags(), "SerialGC unset");
 #endif // INCLUDE_ALL_GCS
diff --git a/src/share/vm/runtime/arguments.hpp b/src/share/vm/runtime/arguments.hpp
index d016e22f22e629e77f562c61a8ad856ce4d8f2cc..ec4b1f630efe308d16eb8f959ef2b289caff9cc4 100644
--- a/src/share/vm/runtime/arguments.hpp
+++ b/src/share/vm/runtime/arguments.hpp
@@ -27,6 +27,7 @@
 
 #include "runtime/java.hpp"
 #include "runtime/perfData.hpp"
+#include "utilities/debug.hpp"
 #include "utilities/top.hpp"
 
 // Arguments parses the command line and recognizes options
@@ -370,11 +371,16 @@ class Arguments : AllStatic {
   static jint parse_vm_init_args(const JavaVMInitArgs* args);
   static jint parse_each_vm_init_arg(const JavaVMInitArgs* args, SysClassPath* scp_p, bool* scp_assembly_required_p, Flag::Flags origin);
   static jint finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required);
-  static bool is_bad_option(const JavaVMOption* option, jboolean ignore,
-    const char* option_type);
+  static bool is_bad_option(const JavaVMOption* option, jboolean ignore, const char* option_type);
+
   static bool is_bad_option(const JavaVMOption* option, jboolean ignore) {
     return is_bad_option(option, ignore, NULL);
   }
+
+  static bool is_percentage(uintx val) {
+    return val <= 100;
+  }
+
   static bool verify_interval(uintx val, uintx min,
                               uintx max, const char* name);
   static bool verify_min_value(intx val, intx min, const char* name);
@@ -440,6 +446,15 @@ class Arguments : AllStatic {
   static jint apply_ergo();
   // Adjusts the arguments after the OS have adjusted the arguments
   static jint adjust_after_os();
+
+  // Verifies that the given value will fit as a MinHeapFreeRatio. If not, an error
+  // message is returned in the provided buffer.
+  static bool verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio);
+
+  // Verifies that the given value will fit as a MaxHeapFreeRatio. If not, an error
+  // message is returned in the provided buffer.
+  static bool verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio);
+
   // Check for consistency in the selection of the garbage collector.
   static bool check_gc_consistency();
   static void check_deprecated_gcs();
diff --git a/src/share/vm/runtime/globals.hpp b/src/share/vm/runtime/globals.hpp
index e8c695756f392d437891bff363bc1e72240ae9f7..e7f6340969236e73be13aa4768489a440528ff17 100644
--- a/src/share/vm/runtime/globals.hpp
+++ b/src/share/vm/runtime/globals.hpp
@@ -3133,15 +3133,15 @@ class CommandLineFlags {
           "Maximum size of class area in Metaspace when compressed "        \
           "class pointers are used")                                        \
                                                                             \
-  product(uintx, MinHeapFreeRatio,    40,                                   \
+  manageable(uintx, MinHeapFreeRatio, 40,                                   \
           "The minimum percentage of heap free after GC to avoid expansion."\
-          " For most GCs this applies to the old generation. In G1 it"      \
-          " applies to the whole heap. Not supported by ParallelGC.")       \
+          " For most GCs this applies to the old generation. In G1 and"     \
+          " ParallelGC it applies to the whole heap.")                      \
                                                                             \
-  product(uintx, MaxHeapFreeRatio,    70,                                   \
+  manageable(uintx, MaxHeapFreeRatio, 70,                                   \
           "The maximum percentage of heap free after GC to avoid shrinking."\
-          " For most GCs this applies to the old generation. In G1 it"      \
-          " applies to the whole heap. Not supported by ParallelGC.")       \
+          " For most GCs this applies to the old generation. In G1 and"     \
+          " ParallelGC it applies to the whole heap.")                      \
                                                                             \
   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
           "Number of milliseconds per MB of free space in the heap")        \
diff --git a/src/share/vm/services/attachListener.cpp b/src/share/vm/services/attachListener.cpp
index 51fdb6fa9aece1c29cb5acf54fa9db5f8ca9aa5f..6ab6c8f9e6dcad095cda588c8615d6241eddfe4d 100644
--- a/src/share/vm/services/attachListener.cpp
+++ b/src/share/vm/services/attachListener.cpp
@@ -282,6 +282,20 @@ static jint set_uintx_flag(const char* name, AttachOperation* op, outputStream*
       return JNI_ERR;
     }
   }
+
+  if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
+    FormatBuffer<80> err_msg("");
+    if (!Arguments::verify_MaxHeapFreeRatio(err_msg, value)) {
+      out->print_cr(err_msg.buffer());
+      return JNI_ERR;
+    }
+  } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
+    FormatBuffer<80> err_msg("");
+    if (!Arguments::verify_MinHeapFreeRatio(err_msg, value)) {
+      out->print_cr(err_msg.buffer());
+      return JNI_ERR;
+    }
+  }
   bool res = CommandLineFlags::uintxAtPut((char*)name, &value, Flag::ATTACH_ON_DEMAND);
   if (! res) {
     out->print_cr("setting flag %s failed", name);
diff --git a/src/share/vm/services/management.cpp b/src/share/vm/services/management.cpp
index 9585960daa2d8da3bfd616bb67a4bd2ba0e78bd6..7d39a2e0490de6ac8deb6f7757a0e92a61bd5a43 100644
--- a/src/share/vm/services/management.cpp
+++ b/src/share/vm/services/management.cpp
@@ -1830,6 +1830,18 @@ JVM_ENTRY(void, jmm_SetVMGlobal(JNIEnv *env, jstring flag_name, jvalue new_value
     succeed = CommandLineFlags::intxAtPut(name, &ivalue, Flag::MANAGEMENT);
   } else if (flag->is_uintx()) {
     uintx uvalue = (uintx)new_value.j;
+
+    if (strncmp(name, "MaxHeapFreeRatio", 17) == 0) {
+      FormatBuffer<80> err_msg("");
+      if (!Arguments::verify_MaxHeapFreeRatio(err_msg, uvalue)) {
+        THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
+      }
+    } else if (strncmp(name, "MinHeapFreeRatio", 17) == 0) {
+      FormatBuffer<80> err_msg("");
+      if (!Arguments::verify_MinHeapFreeRatio(err_msg, uvalue)) {
+        THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), err_msg.buffer());
+      }
+    }
     succeed = CommandLineFlags::uintxAtPut(name, &uvalue, Flag::MANAGEMENT);
   } else if (flag->is_uint64_t()) {
     uint64_t uvalue = (uint64_t)new_value.j;
diff --git a/test/gc/TestVerifySilently.java b/test/gc/TestVerifySilently.java
new file mode 100644
index 0000000000000000000000000000000000000000..deefd4863e45ef1e8d56d3340f4485c4782b1d92
--- /dev/null
+++ b/test/gc/TestVerifySilently.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2014, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test TestVerifySilently.java
+ * @key gc
+ * @bug 8032771
+ * @summary Test silent verification.
+ * @library /testlibrary
+ */
+
+import com.oracle.java.testlibrary.OutputAnalyzer;
+import com.oracle.java.testlibrary.ProcessTools;
+import java.util.ArrayList;
+import java.util.Collections;
+
+class RunSystemGC {
+  public static void main(String args[]) throws Exception {
+    System.gc();
+  }
+}
+
+
+public class TestVerifySilently {
+  private static String[] getTestJavaOpts() {
+    String testVmOptsStr = System.getProperty("test.java.opts");
+    if (!testVmOptsStr.isEmpty()) {
+      return testVmOptsStr.split(" ");
+    } else {
+      return new String[] {};
+    }
+  }
+
+  private static OutputAnalyzer runTest(boolean verifySilently) throws Exception {
+    ArrayList<String> vmOpts = new ArrayList();
+
+    Collections.addAll(vmOpts, getTestJavaOpts());
+    Collections.addAll(vmOpts, new String[] {"-XX:+UnlockDiagnosticVMOptions",
+                                             "-XX:+VerifyDuringStartup",
+                                             "-XX:+VerifyBeforeGC",
+                                             "-XX:+VerifyAfterGC",
+                                             "-XX:" + (verifySilently ? "+":"-") + "VerifySilently",
+                                             RunSystemGC.class.getName()});
+    ProcessBuilder pb =
+      ProcessTools.createJavaProcessBuilder(vmOpts.toArray(new String[vmOpts.size()]));
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+
+    System.out.println("Output:\n" + output.getOutput());
+    return output;
+  }
+
+
+  public static void main(String args[]) throws Exception {
+
+    OutputAnalyzer output;
+
+    output = runTest(false);
+    output.shouldContain("[Verifying");
+    output.shouldHaveExitValue(0);
+
+    output = runTest(true);
+    output.shouldNotContain("[Verifying");
+    output.shouldHaveExitValue(0);
+  }
+}
diff --git a/test/runtime/NMT/CommandLineDetail.java b/test/runtime/NMT/CommandLineDetail.java
index d993316ba9c8add5535d8eb41cd9ec58ca3d6a23..0151b48a67ea16ff703e568b7e9d90a32586bc24 100644
--- a/test/runtime/NMT/CommandLineDetail.java
+++ b/test/runtime/NMT/CommandLineDetail.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2014, 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
@@ -24,7 +24,7 @@
  /*
  * @test
  * @key nmt
- * @summary Running with NMT detail should not result in an error or warning
+ * @summary Running with NMT detail should not result in an error
  * @library /testlibrary
  */
 
@@ -39,7 +39,6 @@ public class CommandLineDetail {
       "-version");
     OutputAnalyzer output = new OutputAnalyzer(pb.start());
     output.shouldNotContain("error");
-    output.shouldNotContain("warning");
     output.shouldHaveExitValue(0);
   }
 }
diff --git a/test/runtime/NMT/CommandLineSummary.java b/test/runtime/NMT/CommandLineSummary.java
index b8415d1bde9233eb65ec710fb50e30a1f187e4c2..9680c345bfb8b47afdf82fe80f55133bab5b36f3 100644
--- a/test/runtime/NMT/CommandLineSummary.java
+++ b/test/runtime/NMT/CommandLineSummary.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2014, 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
@@ -24,7 +24,7 @@
  /*
  * @test
  * @key nmt
- * @summary Running with NMT summary should not result in an error or warning
+ * @summary Running with NMT summary should not result in an error
  * @library /testlibrary
  */
 
@@ -39,7 +39,6 @@ public class CommandLineSummary {
       "-version");
     OutputAnalyzer output = new OutputAnalyzer(pb.start());
     output.shouldNotContain("error");
-    output.shouldNotContain("warning");
     output.shouldHaveExitValue(0);
   }
 }
diff --git a/test/runtime/NMT/CommandLineTurnOffNMT.java b/test/runtime/NMT/CommandLineTurnOffNMT.java
index e8d950cba0ae54394e8f5f22a87308944e96776e..7b8f8beba071d9337235a4a791face65b2f64ce6 100644
--- a/test/runtime/NMT/CommandLineTurnOffNMT.java
+++ b/test/runtime/NMT/CommandLineTurnOffNMT.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2014, 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
@@ -24,7 +24,7 @@
  /*
  * @test
  * @key nmt
- * @summary Turning off NMT should not result in an error or warning
+ * @summary Turning off NMT should not result in an error
  * @library /testlibrary
  */
 
@@ -38,7 +38,6 @@ public class CommandLineTurnOffNMT {
               "-version");
     OutputAnalyzer output = new OutputAnalyzer(pb.start());
     output.shouldNotContain("error");
-    output.shouldNotContain("warning");
     output.shouldHaveExitValue(0);
   }
 }
diff --git a/test/runtime/NMT/PrintNMTStatistics.java b/test/runtime/NMT/PrintNMTStatistics.java
index 96bc2f3267f91fbd3f167f732d61133572a9ae30..fc039d6b24ef14a5c506a79384472a5475706c36 100644
--- a/test/runtime/NMT/PrintNMTStatistics.java
+++ b/test/runtime/NMT/PrintNMTStatistics.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2014 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
@@ -64,7 +64,6 @@ public class PrintNMTStatistics {
     OutputAnalyzer output = new OutputAnalyzer(pb.start());
     output.shouldContain("Java Heap (reserved=");
     output.shouldNotContain("error");
-    output.shouldNotContain("warning");
     output.shouldHaveExitValue(0);
   }
 }