1 /* 2 * Copyright (c) 2019, 2020, 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/zGlobals.hpp" 26 #include "gc/z/zGranuleMap.inline.hpp" 27 #include "gc/z/zMapper_windows.hpp" 28 #include "gc/z/zPhysicalMemoryBacking_windows.hpp" 29 #include "logging/log.hpp" 30 #include "runtime/globals.hpp" 31 #include "utilities/debug.hpp" 32 33 // The backing 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'd chunk is mapped to 36 // a separate paging file mapping. 37 38 ZPhysicalMemoryBacking::ZPhysicalMemoryBacking(size_t max_capacity) : 39 _handles(max_capacity) {} 40 41 bool ZPhysicalMemoryBacking::is_initialized() const { 42 return true; 43 } 44 45 void ZPhysicalMemoryBacking::warn_commit_limits(size_t max) const { 46 // Does nothing 47 } 48 49 HANDLE ZPhysicalMemoryBacking::get_handle(uintptr_t offset) const { 50 HANDLE const handle = _handles.get(offset); 51 assert(handle != 0, "Should be set"); 52 return handle; 53 } 54 55 void ZPhysicalMemoryBacking::put_handle(uintptr_t offset, HANDLE handle) { 56 assert(handle != INVALID_HANDLE_VALUE, "Invalid handle"); 57 assert(_handles.get(offset) == 0, "Should be cleared"); 58 _handles.put(offset, handle); 59 } 60 61 void ZPhysicalMemoryBacking::clear_handle(uintptr_t offset) { 62 assert(_handles.get(offset) != 0, "Should be set"); 63 _handles.put(offset, 0); 64 } 65 66 size_t ZPhysicalMemoryBacking::commit_from_paging_file(size_t offset, size_t size) { 67 for (size_t i = 0; i < size; i += ZGranuleSize) { 68 HANDLE const handle = ZMapper::create_and_commit_paging_file_mapping(ZGranuleSize); 69 if (handle == 0) { 70 return i; 71 } 72 73 put_handle(offset + i, handle); 74 } 75 76 return size; 77 } 78 79 size_t ZPhysicalMemoryBacking::uncommit_from_paging_file(size_t offset, size_t size) { 80 for (size_t i = 0; i < size; i += ZGranuleSize) { 81 HANDLE const handle = get_handle(offset + i); 82 clear_handle(offset + i); 83 ZMapper::close_paging_file_mapping(handle); 84 } 85 86 return size; 87 } 88 89 size_t ZPhysicalMemoryBacking::commit(size_t offset, size_t length) { 90 log_trace(gc, heap)("Committing memory: " SIZE_FORMAT "M-" SIZE_FORMAT "M (" SIZE_FORMAT "M)", 91 offset / M, (offset + length) / M, length / M); 92 93 return commit_from_paging_file(offset, length); 94 } 95 96 size_t ZPhysicalMemoryBacking::uncommit(size_t offset, size_t length) { 97 log_trace(gc, heap)("Uncommitting memory: " SIZE_FORMAT "M-" SIZE_FORMAT "M (" SIZE_FORMAT "M)", 98 offset / M, (offset + length) / M, length / M); 99 100 return uncommit_from_paging_file(offset, length); 101 } 102 103 void ZPhysicalMemoryBacking::map(uintptr_t addr, size_t size, size_t offset) const { 104 assert(is_aligned(offset, ZGranuleSize), "Misaligned"); 105 assert(is_aligned(addr, ZGranuleSize), "Misaligned"); 106 assert(is_aligned(size, ZGranuleSize), "Misaligned"); 107 108 for (size_t i = 0; i < size; i += ZGranuleSize) { 109 HANDLE const handle = get_handle(offset + i); 110 ZMapper::map_view_replace_placeholder(handle, 0 /* offset */, addr + i, ZGranuleSize); 111 } 112 } 113 114 void ZPhysicalMemoryBacking::unmap(uintptr_t addr, size_t size) const { 115 assert(is_aligned(addr, ZGranuleSize), "Misaligned"); 116 assert(is_aligned(size, ZGranuleSize), "Misaligned"); 117 118 for (size_t i = 0; i < size; i += ZGranuleSize) { 119 ZMapper::unmap_view_preserve_placeholder(addr + i, ZGranuleSize); 120 } 121 }