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 33 namespace { 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. 54 TEST_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