/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "precompiled.hpp"

#include "gc/z/zAddressSpaceLimit.hpp"

#include "gc/z/zGlobals.hpp"

#include "runtime/os.hpp"

#include "utilities/align.hpp"

static size_t address_space_limit() {

  julong limit = 0;

  if (os::has_allocatable_memory_limit(&limit)) {

    return (size_t)limit;

  }

  // No limit

  return SIZE_MAX;

}

size_t ZAddressSpaceLimit::mark_stack() {

  // Allow mark stacks to occupy 10% of the address space

  const size_t limit = address_space_limit() / 10;

  return align_up(limit, ZMarkStackSpaceExpandSize);

}

size_t ZAddressSpaceLimit::heap_view() {

  // Allow all heap views to occupy 50% of the address space

  const size_t limit = address_space_limit() / 2 / ZHeapViews;

  return align_up(limit, ZGranuleSize);

}