1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "runtime/os.hpp"
  26 #include "unittest.hpp"
  27 
  28 TEST_VM(os, page_size_for_region) {
  29   size_t large_page_example = 4 * M;
  30   size_t large_page = os::page_size_for_region_aligned(large_page_example, 1);
  31 
  32   size_t small_page = os::vm_page_size();
  33   if (large_page > small_page) {
  34     size_t num_small_in_large = large_page / small_page;
  35     size_t page = os::page_size_for_region_aligned(large_page, num_small_in_large);
  36     ASSERT_EQ(page, small_page) << "Did not get a small page";
  37   }
  38 }
  39 
  40 #ifdef ASSERT
  41 TEST_VM_ASSERT_MSG(os, page_size_for_region_with_zero_min_pages, "sanity") {
  42   size_t region_size = 16 * os::vm_page_size();
  43   os::page_size_for_region_aligned(region_size, 0); // should assert
  44 }
  45 #endif