Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 746b070f5022 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6964458: Reimplement class meta-data storage to use native memory
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2 * Copyright (c) 2001, 2012, 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/objectStartArray.hpp" | |
| 27 #include "memory/allocation.inline.hpp" | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "runtime/java.hpp" | |
| 6197 | 31 #include "services/memTracker.hpp" |
| 0 | 32 |
| 33 void ObjectStartArray::initialize(MemRegion reserved_region) { | |
| 34 // We're based on the assumption that we use the same | |
| 35 // size blocks as the card table. | |
| 36 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity"); | |
| 37 assert((int)block_size <= 512, "block_size must be less than or equal to 512"); | |
| 38 | |
| 39 // Calculate how much space must be reserved | |
| 40 _reserved_region = reserved_region; | |
| 41 | |
| 42 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words; | |
| 43 assert(bytes_to_reserve > 0, "Sanity"); | |
| 44 | |
| 45 bytes_to_reserve = | |
| 46 align_size_up(bytes_to_reserve, os::vm_allocation_granularity()); | |
| 47 | |
| 48 // Do not use large-pages for the backing store. The one large page region | |
| 49 // will be used for the heap proper. | |
| 50 ReservedSpace backing_store(bytes_to_reserve); | |
| 51 if (!backing_store.is_reserved()) { | |
| 52 vm_exit_during_initialization("Could not reserve space for ObjectStartArray"); | |
| 53 } | |
| 6197 | 54 MemTracker::record_virtual_memory_type((address)backing_store.base(), mtGC); |
| 0 | 55 |
| 56 // We do not commit any memory initially | |
| 57 if (!_virtual_space.initialize(backing_store, 0)) { | |
| 58 vm_exit_during_initialization("Could not commit space for ObjectStartArray"); | |
| 59 } | |
| 60 | |
| 61 _raw_base = (jbyte*)_virtual_space.low_boundary(); | |
| 6197 | 62 |
| 0 | 63 if (_raw_base == NULL) { |
| 64 vm_exit_during_initialization("Could not get raw_base address"); | |
| 65 } | |
| 66 | |
| 6197 | 67 MemTracker::record_virtual_memory_type((address)_raw_base, mtGC); |
| 68 | |
| 69 | |
| 0 | 70 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift); |
| 71 | |
| 72 _covered_region.set_start(reserved_region.start()); | |
| 73 _covered_region.set_word_size(0); | |
| 74 | |
| 75 _blocks_region.set_start((HeapWord*)_raw_base); | |
| 76 _blocks_region.set_word_size(0); | |
| 77 } | |
| 78 | |
| 79 void ObjectStartArray::set_covered_region(MemRegion mr) { | |
| 80 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space"); | |
| 81 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region"); | |
| 82 | |
| 83 HeapWord* low_bound = mr.start(); | |
| 84 HeapWord* high_bound = mr.end(); | |
| 85 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary"); | |
| 86 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary"); | |
| 87 | |
| 88 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words; | |
| 89 | |
| 90 // Only commit memory in page sized chunks | |
| 91 requested_blocks_size_in_bytes = | |
| 92 align_size_up(requested_blocks_size_in_bytes, os::vm_page_size()); | |
| 93 | |
| 94 _covered_region = mr; | |
| 95 | |
| 96 size_t current_blocks_size_in_bytes = _blocks_region.byte_size(); | |
| 97 | |
| 98 if (requested_blocks_size_in_bytes > current_blocks_size_in_bytes) { | |
| 99 // Expand | |
| 100 size_t expand_by = requested_blocks_size_in_bytes - current_blocks_size_in_bytes; | |
| 101 if (!_virtual_space.expand_by(expand_by)) { | |
| 102 vm_exit_out_of_memory(expand_by, "object start array expansion"); | |
| 103 } | |
| 104 // Clear *only* the newly allocated region | |
| 105 memset(_blocks_region.end(), clean_block, expand_by); | |
| 106 } | |
| 107 | |
| 108 if (requested_blocks_size_in_bytes < current_blocks_size_in_bytes) { | |
| 109 // Shrink | |
| 110 size_t shrink_by = current_blocks_size_in_bytes - requested_blocks_size_in_bytes; | |
| 111 _virtual_space.shrink_by(shrink_by); | |
| 112 } | |
| 113 | |
| 114 _blocks_region.set_word_size(requested_blocks_size_in_bytes / sizeof(HeapWord)); | |
| 115 | |
| 116 assert(requested_blocks_size_in_bytes % sizeof(HeapWord) == 0, "Block table not expanded in word sized increment"); | |
| 117 assert(requested_blocks_size_in_bytes == _blocks_region.byte_size(), "Sanity"); | |
| 118 assert(block_for_addr(low_bound) == &_raw_base[0], "Checking start of map"); | |
| 119 assert(block_for_addr(high_bound-1) <= &_raw_base[_blocks_region.byte_size()-1], "Checking end of map"); | |
| 120 } | |
| 121 | |
| 122 void ObjectStartArray::reset() { | |
| 123 memset(_blocks_region.start(), clean_block, _blocks_region.byte_size()); | |
| 124 } | |
| 125 | |
| 126 | |
| 127 bool ObjectStartArray::object_starts_in_range(HeapWord* start_addr, | |
| 128 HeapWord* end_addr) const { | |
| 129 assert(start_addr <= end_addr, "range is wrong"); | |
| 130 if (start_addr > end_addr) { | |
| 131 return false; | |
| 132 } | |
| 133 | |
| 134 jbyte* start_block = block_for_addr(start_addr); | |
| 135 jbyte* end_block = block_for_addr(end_addr); | |
| 136 | |
| 137 for (jbyte* block = start_block; block <= end_block; block++) { | |
| 138 if (*block != clean_block) { | |
| 139 return true; | |
| 140 } | |
| 141 } | |
| 142 // No object starts in this slice; verify this using | |
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6725
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6964458: Reimplement class meta-data storage to use native memory
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parents:
6197
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143 // more traditional methods: Note that no object can |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
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144 // start before the start_addr. |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
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145 assert(end_addr == start_addr || |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
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146 object_start(end_addr - 1) <= start_addr, |
| 0 | 147 "Oops an object does start in this slice?"); |
| 148 return false; | |
| 149 } |