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src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author
aoqi
date
Wed, 27 Apr 2016 01:25:04 +0800
changeset 0
f90c822e73f8
child 6876
710a3c8b516e
permissions
-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0 1 /*
aoqi@0 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0 4 *
aoqi@0 5 * This code is free software; you can redistribute it and/or modify it
aoqi@0 6 * under the terms of the GNU General Public License version 2 only, as
aoqi@0 7 * published by the Free Software Foundation.
aoqi@0 8 *
aoqi@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0 12 * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0 13 * accompanied this code).
aoqi@0 14 *
aoqi@0 15 * You should have received a copy of the GNU General Public License version
aoqi@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0 18 *
aoqi@0 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0 20 * or visit www.oracle.com if you need additional information or have any
aoqi@0 21 * questions.
aoqi@0 22 *
aoqi@0 23 */
aoqi@0 24
aoqi@0 25 #include "precompiled.hpp"
aoqi@0 26 #include "gc_implementation/parallelScavenge/objectStartArray.hpp"
aoqi@0 27 #include "memory/allocation.inline.hpp"
aoqi@0 28 #include "memory/cardTableModRefBS.hpp"
aoqi@0 29 #include "oops/oop.inline.hpp"
aoqi@0 30 #include "runtime/java.hpp"
aoqi@0 31 #include "services/memTracker.hpp"
aoqi@0 32
aoqi@0 33 void ObjectStartArray::initialize(MemRegion reserved_region) {
aoqi@0 34 // We're based on the assumption that we use the same
aoqi@0 35 // size blocks as the card table.
aoqi@0 36 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity");
aoqi@0 37 assert((int)block_size <= 512, "block_size must be less than or equal to 512");
aoqi@0 38
aoqi@0 39 // Calculate how much space must be reserved
aoqi@0 40 _reserved_region = reserved_region;
aoqi@0 41
aoqi@0 42 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words;
aoqi@0 43 assert(bytes_to_reserve > 0, "Sanity");
aoqi@0 44
aoqi@0 45 bytes_to_reserve =
aoqi@0 46 align_size_up(bytes_to_reserve, os::vm_allocation_granularity());
aoqi@0 47
aoqi@0 48 // Do not use large-pages for the backing store. The one large page region
aoqi@0 49 // will be used for the heap proper.
aoqi@0 50 ReservedSpace backing_store(bytes_to_reserve);
aoqi@0 51 if (!backing_store.is_reserved()) {
aoqi@0 52 vm_exit_during_initialization("Could not reserve space for ObjectStartArray");
aoqi@0 53 }
aoqi@0 54 MemTracker::record_virtual_memory_type((address)backing_store.base(), mtGC);
aoqi@0 55
aoqi@0 56 // We do not commit any memory initially
aoqi@0 57 if (!_virtual_space.initialize(backing_store, 0)) {
aoqi@0 58 vm_exit_during_initialization("Could not commit space for ObjectStartArray");
aoqi@0 59 }
aoqi@0 60
aoqi@0 61 _raw_base = (jbyte*)_virtual_space.low_boundary();
aoqi@0 62
aoqi@0 63 if (_raw_base == NULL) {
aoqi@0 64 vm_exit_during_initialization("Could not get raw_base address");
aoqi@0 65 }
aoqi@0 66
aoqi@0 67 MemTracker::record_virtual_memory_type((address)_raw_base, mtGC);
aoqi@0 68
aoqi@0 69
aoqi@0 70 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift);
aoqi@0 71
aoqi@0 72 _covered_region.set_start(reserved_region.start());
aoqi@0 73 _covered_region.set_word_size(0);
aoqi@0 74
aoqi@0 75 _blocks_region.set_start((HeapWord*)_raw_base);
aoqi@0 76 _blocks_region.set_word_size(0);
aoqi@0 77 }
aoqi@0 78
aoqi@0 79 void ObjectStartArray::set_covered_region(MemRegion mr) {
aoqi@0 80 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space");
aoqi@0 81 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region");
aoqi@0 82
aoqi@0 83 HeapWord* low_bound = mr.start();
aoqi@0 84 HeapWord* high_bound = mr.end();
aoqi@0 85 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary");
aoqi@0 86 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary");
aoqi@0 87
aoqi@0 88 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words;
aoqi@0 89
aoqi@0 90 // Only commit memory in page sized chunks
aoqi@0 91 requested_blocks_size_in_bytes =
aoqi@0 92 align_size_up(requested_blocks_size_in_bytes, os::vm_page_size());
aoqi@0 93
aoqi@0 94 _covered_region = mr;
aoqi@0 95
aoqi@0 96 size_t current_blocks_size_in_bytes = _blocks_region.byte_size();
aoqi@0 97
aoqi@0 98 if (requested_blocks_size_in_bytes > current_blocks_size_in_bytes) {
aoqi@0 99 // Expand
aoqi@0 100 size_t expand_by = requested_blocks_size_in_bytes - current_blocks_size_in_bytes;
aoqi@0 101 if (!_virtual_space.expand_by(expand_by)) {
aoqi@0 102 vm_exit_out_of_memory(expand_by, OOM_MMAP_ERROR, "object start array expansion");
aoqi@0 103 }
aoqi@0 104 // Clear *only* the newly allocated region
aoqi@0 105 memset(_blocks_region.end(), clean_block, expand_by);
aoqi@0 106 }
aoqi@0 107
aoqi@0 108 if (requested_blocks_size_in_bytes < current_blocks_size_in_bytes) {
aoqi@0 109 // Shrink
aoqi@0 110 size_t shrink_by = current_blocks_size_in_bytes - requested_blocks_size_in_bytes;
aoqi@0 111 _virtual_space.shrink_by(shrink_by);
aoqi@0 112 }
aoqi@0 113
aoqi@0 114 _blocks_region.set_word_size(requested_blocks_size_in_bytes / sizeof(HeapWord));
aoqi@0 115
aoqi@0 116 assert(requested_blocks_size_in_bytes % sizeof(HeapWord) == 0, "Block table not expanded in word sized increment");
aoqi@0 117 assert(requested_blocks_size_in_bytes == _blocks_region.byte_size(), "Sanity");
aoqi@0 118 assert(block_for_addr(low_bound) == &_raw_base[0], "Checking start of map");
aoqi@0 119 assert(block_for_addr(high_bound-1) <= &_raw_base[_blocks_region.byte_size()-1], "Checking end of map");
aoqi@0 120 }
aoqi@0 121
aoqi@0 122 void ObjectStartArray::reset() {
aoqi@0 123 memset(_blocks_region.start(), clean_block, _blocks_region.byte_size());
aoqi@0 124 }
aoqi@0 125
aoqi@0 126
aoqi@0 127 bool ObjectStartArray::object_starts_in_range(HeapWord* start_addr,
aoqi@0 128 HeapWord* end_addr) const {
aoqi@0 129 assert(start_addr <= end_addr, "range is wrong");
aoqi@0 130 if (start_addr > end_addr) {
aoqi@0 131 return false;
aoqi@0 132 }
aoqi@0 133
aoqi@0 134 jbyte* start_block = block_for_addr(start_addr);
aoqi@0 135 jbyte* end_block = block_for_addr(end_addr);
aoqi@0 136
aoqi@0 137 for (jbyte* block = start_block; block <= end_block; block++) {
aoqi@0 138 if (*block != clean_block) {
aoqi@0 139 return true;
aoqi@0 140 }
aoqi@0 141 }
aoqi@0 142
aoqi@0 143 return false;
aoqi@0 144 }

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