Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp @ 6862:8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich.
Reviewed-by: johnc
Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
| author | johnc |
|---|---|
| date | Sat, 06 Oct 2012 01:17:44 -0700 |
| parents | da91efe96a93 |
| children | 746b070f5022 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
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
|
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
|
145 assert(end_addr == start_addr || |
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da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6197
diff
changeset
|
146 object_start(end_addr - 1) <= start_addr, |
| 0 | 147 "Oops an object does start in this slice?"); |
| 148 return false; | |
| 149 } |