Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 52b4284cb496 ab5fbf410512 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
| 28 #include "oops/oop.inline.hpp" | |
| 29 #include "runtime/os.hpp" | |
| 30 #include "utilities/bitMap.inline.hpp" | |
| 6197 | 31 #include "services/memTracker.hpp" |
| 1972 | 32 #ifdef TARGET_OS_FAMILY_linux |
| 33 # include "os_linux.inline.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_OS_FAMILY_solaris | |
| 36 # include "os_solaris.inline.hpp" | |
| 37 #endif | |
| 38 #ifdef TARGET_OS_FAMILY_windows | |
| 39 # include "os_windows.inline.hpp" | |
| 40 #endif | |
| 14411 | 41 #ifdef TARGET_OS_FAMILY_aix |
| 42 # include "os_aix.inline.hpp" | |
| 43 #endif | |
| 3960 | 44 #ifdef TARGET_OS_FAMILY_bsd |
| 45 # include "os_bsd.inline.hpp" | |
| 46 #endif | |
| 0 | 47 |
| 48 bool | |
| 49 ParMarkBitMap::initialize(MemRegion covered_region) | |
| 50 { | |
| 51 const idx_t bits = bits_required(covered_region); | |
| 52 // The bits will be divided evenly between two bitmaps; each of them should be | |
| 53 // an integral number of words. | |
| 54 assert(bits % (BitsPerWord * 2) == 0, "region size unaligned"); | |
| 55 | |
| 56 const size_t words = bits / BitsPerWord; | |
| 57 const size_t raw_bytes = words * sizeof(idx_t); | |
| 58 const size_t page_sz = os::page_size_for_region(raw_bytes, raw_bytes, 10); | |
| 59 const size_t granularity = os::vm_allocation_granularity(); | |
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60 _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity)); |
| 0 | 61 |
| 62 const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 : | |
| 63 MAX2(page_sz, granularity); | |
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64 ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0); |
| 0 | 65 os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz, |
| 66 rs.base(), rs.size()); | |
| 6197 | 67 |
| 68 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
| 69 | |
| 0 | 70 _virtual_space = new PSVirtualSpace(rs, page_sz); |
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71 if (_virtual_space != NULL && _virtual_space->expand_by(_reserved_byte_size)) { |
| 0 | 72 _region_start = covered_region.start(); |
| 73 _region_size = covered_region.word_size(); | |
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74 BitMap::bm_word_t* map = (BitMap::bm_word_t*)_virtual_space->reserved_low_addr(); |
| 0 | 75 _beg_bits.set_map(map); |
| 76 _beg_bits.set_size(bits / 2); | |
| 77 _end_bits.set_map(map + words / 2); | |
| 78 _end_bits.set_size(bits / 2); | |
| 79 return true; | |
| 80 } | |
| 81 | |
| 82 _region_start = 0; | |
| 83 _region_size = 0; | |
| 84 if (_virtual_space != NULL) { | |
| 85 delete _virtual_space; | |
| 86 _virtual_space = NULL; | |
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87 // Release memory reserved in the space. |
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88 rs.release(); |
| 0 | 89 } |
| 90 return false; | |
| 91 } | |
| 92 | |
| 93 #ifdef ASSERT | |
| 94 extern size_t mark_bitmap_count; | |
| 95 extern size_t mark_bitmap_size; | |
| 96 #endif // #ifdef ASSERT | |
| 97 | |
| 98 bool | |
| 99 ParMarkBitMap::mark_obj(HeapWord* addr, size_t size) | |
| 100 { | |
| 101 const idx_t beg_bit = addr_to_bit(addr); | |
| 102 if (_beg_bits.par_set_bit(beg_bit)) { | |
| 103 const idx_t end_bit = addr_to_bit(addr + size - 1); | |
| 104 bool end_bit_ok = _end_bits.par_set_bit(end_bit); | |
| 105 assert(end_bit_ok, "concurrency problem"); | |
| 106 DEBUG_ONLY(Atomic::inc_ptr(&mark_bitmap_count)); | |
| 107 DEBUG_ONLY(Atomic::add_ptr(size, &mark_bitmap_size)); | |
| 108 return true; | |
| 109 } | |
| 110 return false; | |
| 111 } | |
| 112 | |
| 113 size_t ParMarkBitMap::live_words_in_range(HeapWord* beg_addr, oop end_obj) const | |
| 114 { | |
| 115 assert(beg_addr <= (HeapWord*)end_obj, "bad range"); | |
| 116 assert(is_marked(end_obj), "end_obj must be live"); | |
| 117 | |
| 118 idx_t live_bits = 0; | |
| 119 | |
| 120 // The bitmap routines require the right boundary to be word-aligned. | |
| 121 const idx_t end_bit = addr_to_bit((HeapWord*)end_obj); | |
| 122 const idx_t range_end = BitMap::word_align_up(end_bit); | |
| 123 | |
| 124 idx_t beg_bit = find_obj_beg(addr_to_bit(beg_addr), range_end); | |
| 125 while (beg_bit < end_bit) { | |
| 126 idx_t tmp_end = find_obj_end(beg_bit, range_end); | |
| 127 assert(tmp_end < end_bit, "missing end bit"); | |
| 128 live_bits += tmp_end - beg_bit + 1; | |
| 129 beg_bit = find_obj_beg(tmp_end + 1, range_end); | |
| 130 } | |
| 131 return bits_to_words(live_bits); | |
| 132 } | |
| 133 | |
| 134 ParMarkBitMap::IterationStatus | |
| 135 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 136 idx_t range_beg, idx_t range_end) const | |
| 137 { | |
| 138 DEBUG_ONLY(verify_bit(range_beg);) | |
| 139 DEBUG_ONLY(verify_bit(range_end);) | |
| 140 assert(range_beg <= range_end, "live range invalid"); | |
| 141 | |
| 142 // The bitmap routines require the right boundary to be word-aligned. | |
| 143 const idx_t search_end = BitMap::word_align_up(range_end); | |
| 144 | |
| 145 idx_t cur_beg = find_obj_beg(range_beg, search_end); | |
| 146 while (cur_beg < range_end) { | |
| 147 const idx_t cur_end = find_obj_end(cur_beg, search_end); | |
| 148 if (cur_end >= range_end) { | |
| 149 // The obj ends outside the range. | |
| 150 live_closure->set_source(bit_to_addr(cur_beg)); | |
| 151 return incomplete; | |
| 152 } | |
| 153 | |
| 154 const size_t size = obj_size(cur_beg, cur_end); | |
| 155 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
| 156 if (status != incomplete) { | |
| 157 assert(status == would_overflow || status == full, "sanity"); | |
| 158 return status; | |
| 159 } | |
| 160 | |
| 161 // Successfully processed the object; look for the next object. | |
| 162 cur_beg = find_obj_beg(cur_end + 1, search_end); | |
| 163 } | |
| 164 | |
| 165 live_closure->set_source(bit_to_addr(range_end)); | |
| 166 return complete; | |
| 167 } | |
| 168 | |
| 169 ParMarkBitMap::IterationStatus | |
| 170 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 171 ParMarkBitMapClosure* dead_closure, | |
| 172 idx_t range_beg, idx_t range_end, | |
| 173 idx_t dead_range_end) const | |
| 174 { | |
| 175 DEBUG_ONLY(verify_bit(range_beg);) | |
| 176 DEBUG_ONLY(verify_bit(range_end);) | |
| 177 DEBUG_ONLY(verify_bit(dead_range_end);) | |
| 178 assert(range_beg <= range_end, "live range invalid"); | |
| 179 assert(range_end <= dead_range_end, "dead range invalid"); | |
| 180 | |
| 181 // The bitmap routines require the right boundary to be word-aligned. | |
| 182 const idx_t live_search_end = BitMap::word_align_up(range_end); | |
| 183 const idx_t dead_search_end = BitMap::word_align_up(dead_range_end); | |
| 184 | |
| 185 idx_t cur_beg = range_beg; | |
| 186 if (range_beg < range_end && is_unmarked(range_beg)) { | |
| 187 // The range starts with dead space. Look for the next object, then fill. | |
| 188 cur_beg = find_obj_beg(range_beg + 1, dead_search_end); | |
| 189 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
| 190 const size_t size = obj_size(range_beg, dead_space_end); | |
| 191 dead_closure->do_addr(bit_to_addr(range_beg), size); | |
| 192 } | |
| 193 | |
| 194 while (cur_beg < range_end) { | |
| 195 const idx_t cur_end = find_obj_end(cur_beg, live_search_end); | |
| 196 if (cur_end >= range_end) { | |
| 197 // The obj ends outside the range. | |
| 198 live_closure->set_source(bit_to_addr(cur_beg)); | |
| 199 return incomplete; | |
| 200 } | |
| 201 | |
| 202 const size_t size = obj_size(cur_beg, cur_end); | |
| 203 IterationStatus status = live_closure->do_addr(bit_to_addr(cur_beg), size); | |
| 204 if (status != incomplete) { | |
| 205 assert(status == would_overflow || status == full, "sanity"); | |
| 206 return status; | |
| 207 } | |
| 208 | |
| 209 // Look for the start of the next object. | |
| 210 const idx_t dead_space_beg = cur_end + 1; | |
| 211 cur_beg = find_obj_beg(dead_space_beg, dead_search_end); | |
| 212 if (cur_beg > dead_space_beg) { | |
| 213 // Found dead space; compute the size and invoke the dead closure. | |
| 214 const idx_t dead_space_end = MIN2(cur_beg - 1, dead_range_end - 1); | |
| 215 const size_t size = obj_size(dead_space_beg, dead_space_end); | |
| 216 dead_closure->do_addr(bit_to_addr(dead_space_beg), size); | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 live_closure->set_source(bit_to_addr(range_end)); | |
| 221 return complete; | |
| 222 } | |
| 223 | |
| 224 #ifdef ASSERT | |
| 225 void ParMarkBitMap::verify_clear() const | |
| 226 { | |
| 227 const idx_t* const beg = (const idx_t*)_virtual_space->committed_low_addr(); | |
| 228 const idx_t* const end = (const idx_t*)_virtual_space->committed_high_addr(); | |
| 229 for (const idx_t* p = beg; p < end; ++p) { | |
| 230 assert(*p == 0, "bitmap not clear"); | |
| 231 } | |
| 232 } | |
| 233 #endif // #ifdef ASSERT |