117 lines
4.1 KiB
C++
117 lines
4.1 KiB
C++
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "runtime/os.hpp"
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#include "unittest.hpp"
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static size_t small_page_size() {
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return os::vm_page_size();
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}
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static size_t large_page_size() {
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const size_t large_page_size_example = 4 * M;
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return os::page_size_for_region_aligned(large_page_size_example, 1);
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}
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TEST_VM(os, page_size_for_region) {
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size_t large_page_example = 4 * M;
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size_t large_page = os::page_size_for_region_aligned(large_page_example, 1);
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size_t small_page = os::vm_page_size();
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if (large_page > small_page) {
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size_t num_small_in_large = large_page / small_page;
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size_t page = os::page_size_for_region_aligned(large_page, num_small_in_large);
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ASSERT_EQ(page, small_page) << "Did not get a small page";
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}
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}
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TEST_VM(os, page_size_for_region_aligned) {
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if (UseLargePages) {
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const size_t small_page = small_page_size();
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const size_t large_page = large_page_size();
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if (large_page > small_page) {
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size_t num_small_pages_in_large = large_page / small_page;
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size_t page = os::page_size_for_region_aligned(large_page, num_small_pages_in_large);
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ASSERT_EQ(page, small_page);
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}
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}
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}
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TEST_VM(os, page_size_for_region_alignment) {
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if (UseLargePages) {
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const size_t small_page = small_page_size();
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const size_t large_page = large_page_size();
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if (large_page > small_page) {
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const size_t unaligned_region = large_page + 17;
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size_t page = os::page_size_for_region_aligned(unaligned_region, 1);
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ASSERT_EQ(page, small_page);
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const size_t num_pages = 5;
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const size_t aligned_region = large_page * num_pages;
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page = os::page_size_for_region_aligned(aligned_region, num_pages);
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ASSERT_EQ(page, large_page);
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}
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}
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}
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TEST_VM(os, page_size_for_region_unaligned) {
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if (UseLargePages) {
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// Given exact page size, should return that page size.
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for (size_t i = 0; os::_page_sizes[i] != 0; i++) {
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size_t expected = os::_page_sizes[i];
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size_t actual = os::page_size_for_region_unaligned(expected, 1);
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ASSERT_EQ(expected, actual);
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}
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// Given slightly larger size than a page size, return the page size.
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for (size_t i = 0; os::_page_sizes[i] != 0; i++) {
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size_t expected = os::_page_sizes[i];
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size_t actual = os::page_size_for_region_unaligned(expected + 17, 1);
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ASSERT_EQ(expected, actual);
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}
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// Given a slightly smaller size than a page size,
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// return the next smaller page size.
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if (os::_page_sizes[1] > os::_page_sizes[0]) {
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size_t expected = os::_page_sizes[0];
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size_t actual = os::page_size_for_region_unaligned(os::_page_sizes[1] - 17, 1);
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ASSERT_EQ(actual, expected);
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}
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// Return small page size for values less than a small page.
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size_t small_page = small_page_size();
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size_t actual = os::page_size_for_region_unaligned(small_page - 17, 1);
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ASSERT_EQ(small_page, actual);
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}
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}
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#ifdef ASSERT
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TEST_VM_ASSERT_MSG(os, page_size_for_region_with_zero_min_pages, "sanity") {
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size_t region_size = 16 * os::vm_page_size();
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os::page_size_for_region_aligned(region_size, 0); // should assert
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}
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#endif
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