1 /* 2 * Copyright (c) 2019, 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 #include "gc/z/zBackingFile_windows.hpp" 26 #include "gc/z/zGlobals.hpp" 27 #include "gc/z/zGranuleMap.inline.hpp" 28 #include "gc/z/zMapper_windows.hpp" 29 #include "logging/log.hpp" 30 #include "runtime/globals.hpp" 31 #include "utilities/debug.hpp" 32 33 // The backing file commits and uncommits physical memory, that can be 34 // multi-mapped into the virtual address space. To support fine-graned 35 // committing and uncommitting, each ZGranuleSize chunked is mapped to 36 // a separate paging file mapping. 37 38 ZBackingFile::ZBackingFile() : 39 _handles(MaxHeapSize), 40 _size(0) {} 41 42 size_t ZBackingFile::size() const { 43 return _size; 44 } 45 46 HANDLE ZBackingFile::get_handle(uintptr_t offset) const { 47 HANDLE const handle = _handles.get(offset); 48 assert(handle != 0, "Should be set"); 49 return handle; 50 } 51 52 void ZBackingFile::put_handle(uintptr_t offset, HANDLE handle) { 53 assert(handle != INVALID_HANDLE_VALUE, "Invalid handle"); 54 assert(_handles.get(offset) == 0, "Should be cleared"); 55 _handles.put(offset, handle); 56 } 57 58 void ZBackingFile::clear_handle(uintptr_t offset) { 59 assert(_handles.get(offset) != 0, "Should be set"); 60 _handles.put(offset, 0); 61 } 62 63 size_t ZBackingFile::commit_from_paging_file(size_t offset, size_t size) { 64 for (size_t i = 0; i < size; i += ZGranuleSize) { 65 HANDLE const handle = ZMapper::create_and_commit_paging_file_mapping(ZGranuleSize); 66 if (handle == 0) { 67 return i; 68 } 69 70 put_handle(offset + i, handle); 71 } 72 73 return size; 74 } 75 76 size_t ZBackingFile::uncommit_from_paging_file(size_t offset, size_t size) { 77 for (size_t i = 0; i < size; i += ZGranuleSize) { 78 HANDLE const handle = get_handle(offset + i); 79 clear_handle(offset + i); 80 ZMapper::close_paging_file_mapping(handle); 81 } 82 83 return size; 84 } 85 86 size_t ZBackingFile::commit(size_t offset, size_t length) { 87 log_trace(gc, heap)("Committing memory: " SIZE_FORMAT "M-" SIZE_FORMAT "M (" SIZE_FORMAT "M)", 88 offset / M, (offset + length) / M, length / M); 89 90 const size_t committed = commit_from_paging_file(offset, length); 91 92 const size_t end = offset + committed; 93 if (end > _size) { 94 // Update size 95 _size = end; 96 } 97 98 return committed; 99 } 100 101 size_t ZBackingFile::uncommit(size_t offset, size_t length) { 102 log_trace(gc, heap)("Uncommitting memory: " SIZE_FORMAT "M-" SIZE_FORMAT "M (" SIZE_FORMAT "M)", 103 offset / M, (offset + length) / M, length / M); 104 105 return uncommit_from_paging_file(offset, length); 106 } 107 108 void ZBackingFile::map(uintptr_t addr, size_t size, size_t offset) const { 109 assert(is_aligned(offset, ZGranuleSize), "Misaligned"); 110 assert(is_aligned(addr, ZGranuleSize), "Misaligned"); 111 assert(is_aligned(size, ZGranuleSize), "Misaligned"); 112 113 for (size_t i = 0; i < size; i += ZGranuleSize) { 114 HANDLE const handle = get_handle(offset + i); 115 ZMapper::map_view_replace_placeholder(handle, 0 /* offset */, addr + i, ZGranuleSize); 116 } 117 } 118 119 void ZBackingFile::unmap(uintptr_t addr, size_t size) const { 120 assert(is_aligned(addr, ZGranuleSize), "Misaligned"); 121 assert(is_aligned(size, ZGranuleSize), "Misaligned"); 122 123 for (size_t i = 0; i < size; i += ZGranuleSize) { 124 ZMapper::unmap_view_preserve_placeholder(addr + i, ZGranuleSize); 125 } 126 }