1 /* 2 * Copyright (c) 2014, 2015, 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(), _commit_size(0), _special(false), 49 _dirty(), _executable(false) { 50 } 51 52 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t actual_size, size_t commit_size) { 53 if (!rs.is_reserved()) { 54 return false; // Allocation failed. 55 } 56 assert(_low_boundary == NULL, "VirtualSpace already initialized"); 57 assert(commit_size > 0, "Granularity must be non-zero."); 58 59 guarantee(is_ptr_aligned(rs.base(), commit_size), 60 err_msg("Reserved space base " PTR_FORMAT" is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), commit_size)); 61 guarantee(is_size_aligned(actual_size, os::vm_page_size()), 62 err_msg("Given actual reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), actual_size)); 63 guarantee(actual_size <= rs.size(), 64 err_msg("Actual size of reserved space " SIZE_FORMAT" bytes is smaller than reservation at " SIZE_FORMAT" bytes", actual_size, rs.size())); 65 66 _low_boundary = rs.base(); 67 _high_boundary = _low_boundary + actual_size; 68 69 _special = rs.special(); 70 _executable = rs.executable(); 71 72 _commit_size = commit_size; 73 74 assert(_committed.size() == 0, "virtual space initialized more than once"); 75 BitMap::idx_t size_in_commit_pages = round_to(rs.size(), commit_size); 76 _committed.resize(size_in_commit_pages, /* in_resource_area */ false); 77 if (_special) { 78 _dirty.resize(size_in_commit_pages, /* in_resource_area */ false); 79 } 80 81 return true; 82 } 83 84 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() { 85 release(); 86 } 87 88 void G1PageBasedVirtualSpace::release() { 89 // This does not release memory it never reserved. 90 // Caller must release via rs.release(); 91 _low_boundary = NULL; 92 _high_boundary = NULL; 93 _special = false; 94 _executable = false; 95 _commit_size = 0; 96 _committed.resize(0, false); 97 _dirty.resize(0, false); 98 } 99 100 size_t G1PageBasedVirtualSpace::committed_size() const { 101 size_t result = _committed.count_one_bits() * _commit_size; 102 // The last page might not be in full. 103 if (_committed.at(_committed.size()-1)) { 104 result -= pointer_delta((char*)align_ptr_up(_high_boundary, _commit_size), _high_boundary, sizeof(char)); 105 } 106 return result; 107 } 108 109 size_t G1PageBasedVirtualSpace::reserved_size() const { 110 return pointer_delta(_high_boundary, _low_boundary, sizeof(char)); 111 } 112 113 size_t G1PageBasedVirtualSpace::uncommitted_size() const { 114 return reserved_size() - committed_size(); 115 } 116 117 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { 118 return (addr - _low_boundary) / _commit_size; 119 } 120 121 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const { 122 uintptr_t end = start + size_in_pages; 123 return _committed.get_next_zero_offset(start, end) >= end; 124 } 125 126 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const { 127 uintptr_t end = start + size_in_pages; 128 return _committed.get_next_one_offset(start, end) >= end; 129 } 130 131 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) { 132 return _low_boundary + index * _commit_size; 133 } 134 135 char* G1PageBasedVirtualSpace::page_end(uintptr_t index) { 136 guarantee(index < _committed.size(), "invariant"); 137 if (index != (_committed.size() - 1)) { 138 return page_start(index + 1); 139 } 140 return _high_boundary; 141 } 142 143 void G1PageBasedVirtualSpace::commit_internal(char* start, char* end) { 144 guarantee(start >= _low_boundary && start < _high_boundary, 145 err_msg("Start address " PTR_FORMAT" is outside of reserved space.", p2i(start))); 146 guarantee(is_ptr_aligned(start, _commit_size), 147 err_msg("Start address should be aligned to commit size " SIZE_FORMAT" but got " PTR_FORMAT".", 148 _commit_size, p2i(start))); 149 150 guarantee(end >= _low_boundary && end <= _high_boundary, 151 err_msg("End address " PTR_FORMAT" is outside of reserved space.", p2i(end))); 152 bool is_high_aligned_to_commit_size = is_ptr_aligned(_high_boundary, _commit_size); 153 guarantee(is_ptr_aligned(end, is_high_aligned_to_commit_size ? _commit_size : os::vm_page_size()), 154 err_msg("End address should be aligned to page size " SIZE_FORMAT" but got " PTR_FORMAT".", 155 is_high_aligned_to_commit_size ? _commit_size : os::vm_page_size(), 156 p2i(end))); 157 // First try to commit in commit_size chunks. 158 char* const aligned_end_address = (char*)align_ptr_down(end, _commit_size); 159 size_t const size = pointer_delta(aligned_end_address, start, sizeof(char)); 160 if (size != 0) { 161 os::commit_memory_or_exit(start, size, _commit_size, _executable, 162 err_msg("Failed to commit area from " PTR_FORMAT" to " PTR_FORMAT" of length " SIZE_FORMAT".", 163 p2i(start), p2i(aligned_end_address), size)); 164 } 165 // Finally, commit any remaining tail. 166 if (end != aligned_end_address) { 167 size_t const tail_size = pointer_delta(end, aligned_end_address, sizeof(char)); 168 guarantee(tail_size < _commit_size, 169 err_msg("Remaining size " SIZE_FORMAT "must be smaller than commit size of " SIZE_FORMAT, tail_size, _commit_size)); 170 os::commit_memory_or_exit(start, tail_size, _executable, 171 err_msg("Failed to commit remainder pages from " PTR_FORMAT" to " PTR_FORMAT" of length "SIZE_FORMAT".", 172 p2i(aligned_end_address), p2i(end), tail_size)); 173 } 174 } 175 176 bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) { 177 // We need to make sure to commit all pages covered by the given area. 178 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted"); 179 180 bool zero_filled = true; 181 uintptr_t end = start + size_in_pages; 182 183 if (_special) { 184 // Check for dirty pages and update zero_filled if any found. 185 if (_dirty.get_next_one_offset(start,end) < end) { 186 zero_filled = false; 187 _dirty.clear_range(start, end); 188 } 189 } else { 190 commit_internal(page_start(start), page_end(end - 1)); 191 } 192 _committed.set_range(start, end); 193 194 if (AlwaysPreTouch) { 195 os::pretouch_memory(page_start(start), page_end(end - 1)); 196 } 197 return zero_filled; 198 } 199 200 void G1PageBasedVirtualSpace::uncommit_internal(char* start, char* end) { 201 os::uncommit_memory(start, pointer_delta(end, start, sizeof(char))); 202 } 203 204 void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) { 205 guarantee(is_area_committed(start, size_in_pages), "checking"); 206 207 uintptr_t end = start + size_in_pages; 208 if (_special) { 209 // Mark that memory is dirty. If committed again the memory might 210 // need to be cleared explicitly. 211 _dirty.set_range(start, end); 212 } else { 213 uncommit_internal(page_start(start), page_end(end - 1)); 214 } 215 216 _committed.clear_range(start, end); 217 } 218 219 bool G1PageBasedVirtualSpace::contains(const void* p) const { 220 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary; 221 } 222 223 #ifndef PRODUCT 224 void G1PageBasedVirtualSpace::print_on(outputStream* out) { 225 out->print ("Virtual space:"); 226 if (_special) out->print(" (pinned in memory)"); 227 out->cr(); 228 out->print_cr(" - committed: " SIZE_FORMAT, committed_size()); 229 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); 230 out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT", " PTR_FORMAT"]", p2i(_low_boundary), p2i(_high_boundary)); 231 } 232 233 void G1PageBasedVirtualSpace::print() { 234 print_on(tty); 235 } 236 #endif