src/share/vm/gc_implementation/g1/g1_globals.hpp

rev 2907 : 7113021: G1: automatically enable young gen size auto-tuning when -Xms==-Xmx
Summary: Use a percentage of -Xms as min and another percentage of -Xmx as max for the young gen size
Reviewed-by: tonyp

@@ -287,10 +287,18 @@
           "Raise a fatal VM exit out of memory failure in the event "       \
           " that heap expansion fails due to running out of swap.")         \
                                                                             \
   develop(uintx, G1ConcMarkForceOverflow, 0,                                \
           "The number of times we'll force an overflow during "             \
-          "concurrent marking")
+          "concurrent marking")                                             \
+                                                                            \
+  develop(uintx, G1DefaultMinNewGenPercent, 20,                             \
+          "Percentage (0-100) of the heap size to use as minunimum "        \
+          "young gen size.")                                                \
+                                                                            \
+  develop(uintx, G1DefaultMaxNewGenPercent, 50,                             \
+          "Percentage (0-100) of the heap size to use as minunimum "        \
+          "young gen size.")
 
 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)
 
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1_GLOBALS_HPP