components/runtime/openjdk-8/patches/0037-patch-hotspot_src_share_vm_runtime_arguments.cpp.patch

   1 $NetBSD: patch-hotspot_src_share_vm_runtime_arguments.cpp,v 1.1 2015/08/27 19:03:59 joerg Exp $
   2
   3 On 64bit systems, the JVM by default reserves 1GB VA to mangle class
   4 pointers into a 32bit representation. When the available memory is less
   5 than 16GB, e.g. due to process limits, scale this down. Even unused
   6 pages waste system resources and the default limit can stop the JVM
   7 from starting with ulimit -v 2G.
   8
   9 --- hotspot/src/share/vm/runtime/arguments.cpp.orig     2015-08-26 15:02:34.000000000 +0000
  10 +++ hotspot/src/share/vm/runtime/arguments.cpp
  11 @@ -1808,6 +1808,12 @@ void Arguments::set_heap_size() {
  12      FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
  13    }
  14
  15 +  if (FLAG_IS_DEFAULT(CompressedClassSpaceSize)) {
  16 +    julong reasonable_max = phys_mem / 16;
  17 +    reasonable_max = MIN2(reasonable_max, (julong)CompressedClassSpaceSize);
  18 +    FLAG_SET_ERGO(uintx, CompressedClassSpaceSize, (uintx)reasonable_max);
  19 +  }
  20 +
  21    // If the minimum or initial heap_size have not been set or requested to be set
  22    // ergonomically, set them accordingly.
  23    if (InitialHeapSize == 0 || min_heap_size() == 0) {