1 /* 2 * Copyright (c) 2014, 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 25 #include "precompiled.hpp" 26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp" 27 #include "oops/markOop.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "services/memTracker.hpp" 30 #ifdef TARGET_OS_FAMILY_linux 31 # include "os_linux.inline.hpp" 32 #endif 33 #ifdef TARGET_OS_FAMILY_solaris 34 # include "os_solaris.inline.hpp" 35 #endif 36 #ifdef TARGET_OS_FAMILY_windows 37 # include "os_windows.inline.hpp" 38 #endif 39 #ifdef TARGET_OS_FAMILY_aix 40 # include "os_aix.inline.hpp" 41 #endif 42 #ifdef TARGET_OS_FAMILY_bsd 43 # include "os_bsd.inline.hpp" 44 #endif 45 #include "utilities/bitMap.inline.hpp" 46 47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL), 48 _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) { 49 } 50 51 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) { 52 if (!rs.is_reserved()) { 53 return false; // Allocation failed. 54 } 55 assert(_low_boundary == NULL, "VirtualSpace already initialized"); 56 assert(page_size > 0, "Granularity must be non-zero."); 57 58 _low_boundary = rs.base(); 59 _high_boundary = _low_boundary + rs.size(); 60 61 _special = rs.special(); 62 _executable = rs.executable(); 63 64 _page_size = page_size; 65 66 assert(_committed.size() == 0, "virtual space initialized more than once"); 67 uintx size_in_bits = rs.size() / page_size; 68 _committed.resize(size_in_bits, /* in_resource_area */ false); 69 70 return true; 71 } 72 73 74 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() { 75 release(); 76 } 77 78 void G1PageBasedVirtualSpace::release() { 79 // This does not release memory it never reserved. 80 // Caller must release via rs.release(); 81 _low_boundary = NULL; 82 _high_boundary = NULL; 83 _special = false; 84 _executable = false; 85 _page_size = 0; 86 _committed.resize(0, false); 87 } 88 89 size_t G1PageBasedVirtualSpace::committed_size() const { 90 return _committed.count_one_bits() * _page_size; 91 } 92 93 size_t G1PageBasedVirtualSpace::reserved_size() const { 94 return pointer_delta(_high_boundary, _low_boundary, sizeof(char)); 95 } 96 97 size_t G1PageBasedVirtualSpace::uncommitted_size() const { 98 return reserved_size() - committed_size(); 99 } 100 101 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { 102 return (addr - _low_boundary) / _page_size; 103 } 104 105 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const { 106 uintptr_t end = start + size_in_pages; 107 return _committed.get_next_zero_offset(start, end) >= end; 108 } 109 110 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const { 111 uintptr_t end = start + size_in_pages; 112 return _committed.get_next_one_offset(start, end) >= end; 113 } 114 115 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) { 116 return _low_boundary + index * _page_size; 117 } 118 119 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) { 120 return num * _page_size; 121 } 122 123 MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) { 124 // We need to make sure to commit all pages covered by the given area. 125 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted"); 126 127 if (!_special) { 128 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable, 129 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages)); 130 } 131 _committed.set_range(start, start + size_in_pages); 132 133 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize); 134 if (AlwaysPreTouch) { 135 os::pretouch_memory((char*)result.start(), (char*)result.end()); 136 } 137 return result; 138 } 139 140 MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) { 141 guarantee(is_area_committed(start, size_in_pages), "checking"); 142 143 if (!_special) { 144 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages)); 145 } 146 147 _committed.clear_range(start, start + size_in_pages); 148 149 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize); 150 return result; 151 } 152 153 bool G1PageBasedVirtualSpace::contains(const void* p) const { 154 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary; 155 } 156 157 #ifndef PRODUCT 158 void G1PageBasedVirtualSpace::print_on(outputStream* out) { 159 out->print ("Virtual space:"); 160 if (special()) out->print(" (pinned in memory)"); 161 out->cr(); 162 out->print_cr(" - committed: " SIZE_FORMAT, committed_size()); 163 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); 164 out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary)); 165 } 166 167 void G1PageBasedVirtualSpace::print() { 168 print_on(tty); 169 } 170 #endif