--- a/hotspot/src/share/vm/gc/g1/g1YoungGenSizer.cpp	Tue Jun 21 19:35:39 2016 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1YoungGenSizer.cpp	Tue Jun 21 19:37:30 2016 +0200
@@ -45,7 +45,7 @@
                             "A new max generation size of " SIZE_FORMAT "k will be used.",
                             NewSize/K, MaxNewSize/K, NewSize/K);
     }
-    MaxNewSize = NewSize;
+    FLAG_SET_ERGO(size_t, MaxNewSize, NewSize);
   }
 
   if (FLAG_IS_CMDLINE(NewSize)) {

--- a/hotspot/src/share/vm/gc/shared/collectorPolicy.cpp	Tue Jun 21 19:35:39 2016 +0200
+++ b/hotspot/src/share/vm/gc/shared/collectorPolicy.cpp	Tue Jun 21 19:37:30 2016 +0200
@@ -50,7 +50,6 @@
     _initial_heap_byte_size(InitialHeapSize),
     _max_heap_byte_size(MaxHeapSize),
     _min_heap_byte_size(Arguments::min_heap_size()),
-    _max_heap_size_cmdline(false),
     _size_policy(NULL),
     _should_clear_all_soft_refs(false),
     _all_soft_refs_clear(false)
@@ -92,7 +91,6 @@
     if (_min_heap_byte_size != 0 && MaxHeapSize < _min_heap_byte_size) {
       vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified");
     }
-    _max_heap_size_cmdline = true;
   }
 
   // Check heap parameter properties
@@ -285,7 +283,7 @@
          "heap_alignment: " SIZE_FORMAT " not aligned by gen_alignment: " SIZE_FORMAT,
          _heap_alignment, _gen_alignment);
 
-  // All generational heaps have a youngest gen; handle those flags here
+  // All generational heaps have a young gen; handle those flags here
 
   // Make sure the heap is large enough for two generations
   size_t smallest_new_size = young_gen_size_lower_bound();
@@ -307,7 +305,7 @@
   // Make sure NewSize allows an old generation to fit even if set on the command line
   if (FLAG_IS_CMDLINE(NewSize) && NewSize >= _initial_heap_byte_size) {
     log_warning(gc, ergo)("NewSize was set larger than initial heap size, will use initial heap size.");
-    NewSize = bound_minus_alignment(NewSize, _initial_heap_byte_size);
+    FLAG_SET_ERGO(size_t, NewSize, bound_minus_alignment(NewSize, _initial_heap_byte_size));
   }
 
   // Now take the actual NewSize into account. We will silently increase NewSize
@@ -315,10 +313,7 @@
   size_t bounded_new_size = bound_minus_alignment(NewSize, MaxHeapSize);
   bounded_new_size = MAX2(smallest_new_size, (size_t)align_size_down(bounded_new_size, _gen_alignment));
   if (bounded_new_size != NewSize) {
-    // Do not use FLAG_SET_ERGO to update NewSize here, since this will override
-    // if NewSize was set on the command line or not. This information is needed
-    // later when setting the initial and minimum young generation size.
-    NewSize = bounded_new_size;
+    FLAG_SET_ERGO(size_t, NewSize, bounded_new_size);
   }
   _min_young_size = smallest_new_size;
   _initial_young_size = NewSize;
@@ -361,11 +356,11 @@
     vm_exit_during_initialization("Invalid young gen ratio specified");
   }
 
-  OldSize = MAX2(OldSize, old_gen_size_lower_bound());
+  if (OldSize < old_gen_size_lower_bound()) {
+    FLAG_SET_ERGO(size_t, OldSize, old_gen_size_lower_bound());
+  }
   if (!is_size_aligned(OldSize, _gen_alignment)) {
-    // Setting OldSize directly to preserve information about the possible
-    // setting of OldSize on the command line.
-    OldSize = align_size_down(OldSize, _gen_alignment);
+    FLAG_SET_ERGO(size_t, OldSize, align_size_down(OldSize, _gen_alignment));
   }
 
   if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(MaxHeapSize)) {
@@ -384,7 +379,7 @@
 
   // Adjust NewSize and OldSize or MaxHeapSize to match each other
   if (NewSize + OldSize > MaxHeapSize) {
-    if (_max_heap_size_cmdline) {
+    if (FLAG_IS_CMDLINE(MaxHeapSize)) {
       // Somebody has set a maximum heap size with the intention that we should not
       // exceed it. Adjust New/OldSize as necessary.
       size_t calculated_size = NewSize + OldSize;

--- a/hotspot/src/share/vm/gc/shared/collectorPolicy.hpp	Tue Jun 21 19:35:39 2016 +0200
+++ b/hotspot/src/share/vm/gc/shared/collectorPolicy.hpp	Tue Jun 21 19:37:30 2016 +0200
@@ -72,10 +72,6 @@
   size_t _space_alignment;
   size_t _heap_alignment;
 
-  // Needed to keep information if MaxHeapSize was set on the command line
-  // when the flag value is aligned etc by ergonomics.
-  bool _max_heap_size_cmdline;
-
   // The sizing of the heap is controlled by a sizing policy.
   AdaptiveSizePolicy* _size_policy;