8372961: [BACKOUT] Remove the default value of InitialRAMPercentage

Author: jsikstro

src/hotspot/share/gc/shared/gc_globals.hpp

@@ -291,7 +291,7 @@
           "size on systems with small physical memory size")                \
           range(0.0, 100.0)                                                 \
                                                                             \
-  product(double, InitialRAMPercentage, 0.0,                                \
+  product(double, InitialRAMPercentage, 0.2,                                \
           "Percentage of real memory used for initial heap size")           \
           range(0.0, 100.0)                                                 \
                                                                             \

src/hotspot/share/runtime/flags/jvmFlag.cpp

@@ -162,7 +162,7 @@ void JVMFlag::print_on(outputStream* st, bool withComments, bool printRanges) co
     //      uintx ThresholdTolerance                       = 10                                        {product} {default}
     //     size_t TLABSize                                 = 0                                         {product} {default}
     //      uintx SurvivorRatio                            = 8                                         {product} {default}
-    //     double InitialRAMPercentage                     = 0.000000                                  {product} {default}
+    //     double InitialRAMPercentage                     = 1.562500                                  {product} {default}
     //      ccstr CompileCommandFile                       = MyFile.cmd                                {product} {command line}
     //  ccstrlist CompileOnly                              = Method1
     //            CompileOnly                             += Method2                                   {product} {command line}

src/java.base/share/man/java.md

@@ -2455,7 +2455,8 @@ Java HotSpot VM.
 `-XX:InitialRAMPercentage=`*percent*
 :   Sets the initial amount of memory that the JVM will use for the Java heap
     before applying ergonomics heuristics as a percentage of the maximum amount
-    determined as described in the `-XX:MaxRAM` option.
+    determined as described in the `-XX:MaxRAM` option. The default value is
+    0.2 percent.
 
     The following example shows how to set the percentage of the initial
     amount of memory used for the Java heap: