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| 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 | +} |
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