1/*
2 * Copyright (c) 2018, 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#include "precompiled.hpp"
25
26#ifdef _WINDOWS
27
28#include "runtime/os.hpp"
29#include "runtime/flags/flagSetting.hpp"
30#include "runtime/globals_extension.hpp"
31#include "unittest.hpp"
32
33namespace {
34 class MemoryReleaser {
35 char* const _ptr;
36 const size_t _size;
37 public:
38 MemoryReleaser(char* ptr, size_t size) : _ptr(ptr), _size(size) { }
39 ~MemoryReleaser() {
40 os::release_memory_special(_ptr, _size);
41 }
42 };
43}
44
45// test tries to allocate memory in a single contiguous memory block at a particular address.
46// The test first tries to find a good approximate address to allocate at by using the same
47// method to allocate some memory at any address. The test then tries to allocate memory in
48// the vicinity (not directly after it to avoid possible by-chance use of that location)
49// This is of course only some dodgy assumption, there is no guarantee that the vicinity of
50// the previously allocated memory is available for allocation. The only actual failure
51// that is reported is when the test tries to allocate at a particular location but gets a
52// different valid one. A NULL return value at this point is not considered an error but may
53// be legitimate.
54TEST_VM(os_windows, reserve_memory_special) {
55 if (!UseLargePages) {
56 return;
57 }
58
59 // set globals to make sure we hit the correct code path
60 FLAG_GUARD(UseLargePagesIndividualAllocation);
61 FLAG_GUARD(UseNUMAInterleaving);
62 FLAG_SET_CMDLINE(UseLargePagesIndividualAllocation, false);
63 FLAG_SET_CMDLINE(UseNUMAInterleaving, false);
64
65 const size_t large_allocation_size = os::large_page_size() * 4;
66 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
67 if (result != NULL) {
68 // failed to allocate memory, skipping the test
69 return;
70 }
71 MemoryReleaser mr(result, large_allocation_size);
72
73 // allocate another page within the recently allocated memory area which seems to be a good location. At least
74 // we managed to get it once.
75 const size_t expected_allocation_size = os::large_page_size();
76 char* expected_location = result + os::large_page_size();
77 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
78 if (actual_location != NULL) {
79 // failed to allocate memory, skipping the test
80 return;
81 }
82 MemoryReleaser mr2(actual_location, expected_allocation_size);
83
84 EXPECT_EQ(expected_location, actual_location)
85 << "Failed to allocate memory at requested location " << expected_location << " of size " << expected_allocation_size;
86}
87
88#endif
89