8024366: Make UseNUMA enable UseNUMAInterleaving

Reviewed-by: mgerdin
Contributed-by: shrinivas.joshi@oracle.com

src/share/vm/runtime/arguments.cpp

@@ -3835,18 +3835,24 @@ jint Arguments::apply_ergo() {
 }
 
 jint Arguments::adjust_after_os() {
-#if INCLUDE_ALL_GCS
-  if (UseParallelGC || UseParallelOldGC) {
   if (UseNUMA) {
+    if (UseParallelGC || UseParallelOldGC) {
       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
       }
-      // For those collectors or operating systems (eg, Windows) that do
-      // not support full UseNUMA, we will map to UseNUMAInterleaving for now
-      UseNUMAInterleaving = true;
+    }
+    // UseNUMAInterleaving is set to ON for all collectors and
+    // platforms when UseNUMA is set to ON. NUMA-aware collectors
+    // such as the parallel collector for Linux and Solaris will
+    // interleave old gen and survivor spaces on top of NUMA
+    // allocation policy for the eden space.
+    // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
+    // all platforms and ParallelGC on Windows will interleave all
+    // of the heap spaces across NUMA nodes.
+    if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
+      FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
     }
   }
-#endif // INCLUDE_ALL_GCS
   return JNI_OK;
 }