Wed, 27 Apr 2016 01:25:04 +0800
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/g1/g1SATBCardTableModRefBS.hpp" |
aoqi@0 | 27 | #include "gc_implementation/g1/heapRegion.hpp" |
aoqi@0 | 28 | #include "gc_implementation/g1/satbQueue.hpp" |
aoqi@0 | 29 | #include "runtime/mutexLocker.hpp" |
aoqi@0 | 30 | #include "runtime/thread.inline.hpp" |
aoqi@0 | 31 | |
aoqi@0 | 32 | G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, |
aoqi@0 | 33 | int max_covered_regions) : |
aoqi@0 | 34 | CardTableModRefBSForCTRS(whole_heap, max_covered_regions) |
aoqi@0 | 35 | { |
aoqi@0 | 36 | _kind = G1SATBCT; |
aoqi@0 | 37 | } |
aoqi@0 | 38 | |
aoqi@0 | 39 | |
aoqi@0 | 40 | void G1SATBCardTableModRefBS::enqueue(oop pre_val) { |
aoqi@0 | 41 | // Nulls should have been already filtered. |
aoqi@0 | 42 | assert(pre_val->is_oop(true), "Error"); |
aoqi@0 | 43 | |
aoqi@0 | 44 | if (!JavaThread::satb_mark_queue_set().is_active()) return; |
aoqi@0 | 45 | Thread* thr = Thread::current(); |
aoqi@0 | 46 | if (thr->is_Java_thread()) { |
aoqi@0 | 47 | JavaThread* jt = (JavaThread*)thr; |
aoqi@0 | 48 | jt->satb_mark_queue().enqueue(pre_val); |
aoqi@0 | 49 | } else { |
aoqi@0 | 50 | MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); |
aoqi@0 | 51 | JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); |
aoqi@0 | 52 | } |
aoqi@0 | 53 | } |
aoqi@0 | 54 | |
aoqi@0 | 55 | template <class T> void |
aoqi@0 | 56 | G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { |
aoqi@0 | 57 | if (!JavaThread::satb_mark_queue_set().is_active()) return; |
aoqi@0 | 58 | T* elem_ptr = dst; |
aoqi@0 | 59 | for (int i = 0; i < count; i++, elem_ptr++) { |
aoqi@0 | 60 | T heap_oop = oopDesc::load_heap_oop(elem_ptr); |
aoqi@0 | 61 | if (!oopDesc::is_null(heap_oop)) { |
aoqi@0 | 62 | enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); |
aoqi@0 | 63 | } |
aoqi@0 | 64 | } |
aoqi@0 | 65 | } |
aoqi@0 | 66 | |
aoqi@0 | 67 | bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) { |
aoqi@0 | 68 | jbyte val = _byte_map[card_index]; |
aoqi@0 | 69 | // It's already processed |
aoqi@0 | 70 | if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { |
aoqi@0 | 71 | return false; |
aoqi@0 | 72 | } |
aoqi@0 | 73 | |
aoqi@0 | 74 | if (val == g1_young_gen) { |
aoqi@0 | 75 | // the card is for a young gen region. We don't need to keep track of all pointers into young |
aoqi@0 | 76 | return false; |
aoqi@0 | 77 | } |
aoqi@0 | 78 | |
aoqi@0 | 79 | // Cached bit can be installed either on a clean card or on a claimed card. |
aoqi@0 | 80 | jbyte new_val = val; |
aoqi@0 | 81 | if (val == clean_card_val()) { |
aoqi@0 | 82 | new_val = (jbyte)deferred_card_val(); |
aoqi@0 | 83 | } else { |
aoqi@0 | 84 | if (val & claimed_card_val()) { |
aoqi@0 | 85 | new_val = val | (jbyte)deferred_card_val(); |
aoqi@0 | 86 | } |
aoqi@0 | 87 | } |
aoqi@0 | 88 | if (new_val != val) { |
aoqi@0 | 89 | Atomic::cmpxchg(new_val, &_byte_map[card_index], val); |
aoqi@0 | 90 | } |
aoqi@0 | 91 | return true; |
aoqi@0 | 92 | } |
aoqi@0 | 93 | |
aoqi@0 | 94 | void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) { |
aoqi@0 | 95 | jbyte *const first = byte_for(mr.start()); |
aoqi@0 | 96 | jbyte *const last = byte_after(mr.last()); |
aoqi@0 | 97 | |
aoqi@0 | 98 | // Below we may use an explicit loop instead of memset() because on |
aoqi@0 | 99 | // certain platforms memset() can give concurrent readers phantom zeros. |
aoqi@0 | 100 | if (UseMemSetInBOT) { |
aoqi@0 | 101 | memset(first, g1_young_gen, last - first); |
aoqi@0 | 102 | } else { |
aoqi@0 | 103 | for (jbyte* i = first; i < last; i++) { |
aoqi@0 | 104 | *i = g1_young_gen; |
aoqi@0 | 105 | } |
aoqi@0 | 106 | } |
aoqi@0 | 107 | } |
aoqi@0 | 108 | |
aoqi@0 | 109 | #ifndef PRODUCT |
aoqi@0 | 110 | void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) { |
aoqi@0 | 111 | verify_region(mr, g1_young_gen, true); |
aoqi@0 | 112 | } |
aoqi@0 | 113 | #endif |
aoqi@0 | 114 | |
aoqi@0 | 115 | G1SATBCardTableLoggingModRefBS:: |
aoqi@0 | 116 | G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, |
aoqi@0 | 117 | int max_covered_regions) : |
aoqi@0 | 118 | G1SATBCardTableModRefBS(whole_heap, max_covered_regions), |
aoqi@0 | 119 | _dcqs(JavaThread::dirty_card_queue_set()) |
aoqi@0 | 120 | { |
aoqi@0 | 121 | _kind = G1SATBCTLogging; |
aoqi@0 | 122 | } |
aoqi@0 | 123 | |
aoqi@0 | 124 | void |
aoqi@0 | 125 | G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, |
aoqi@0 | 126 | oop new_val, |
aoqi@0 | 127 | bool release) { |
aoqi@0 | 128 | volatile jbyte* byte = byte_for(field); |
aoqi@0 | 129 | if (*byte == g1_young_gen) { |
aoqi@0 | 130 | return; |
aoqi@0 | 131 | } |
aoqi@0 | 132 | OrderAccess::storeload(); |
aoqi@0 | 133 | if (*byte != dirty_card) { |
aoqi@0 | 134 | *byte = dirty_card; |
aoqi@0 | 135 | Thread* thr = Thread::current(); |
aoqi@0 | 136 | if (thr->is_Java_thread()) { |
aoqi@0 | 137 | JavaThread* jt = (JavaThread*)thr; |
aoqi@0 | 138 | jt->dirty_card_queue().enqueue(byte); |
aoqi@0 | 139 | } else { |
aoqi@0 | 140 | MutexLockerEx x(Shared_DirtyCardQ_lock, |
aoqi@0 | 141 | Mutex::_no_safepoint_check_flag); |
aoqi@0 | 142 | _dcqs.shared_dirty_card_queue()->enqueue(byte); |
aoqi@0 | 143 | } |
aoqi@0 | 144 | } |
aoqi@0 | 145 | } |
aoqi@0 | 146 | |
aoqi@0 | 147 | void |
aoqi@0 | 148 | G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, |
aoqi@0 | 149 | oop new_val) { |
aoqi@0 | 150 | uintptr_t field_uint = (uintptr_t)field; |
aoqi@0 | 151 | uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val); |
aoqi@0 | 152 | uintptr_t comb = field_uint ^ new_val_uint; |
aoqi@0 | 153 | comb = comb >> HeapRegion::LogOfHRGrainBytes; |
aoqi@0 | 154 | if (comb == 0) return; |
aoqi@0 | 155 | if (new_val == NULL) return; |
aoqi@0 | 156 | // Otherwise, log it. |
aoqi@0 | 157 | G1SATBCardTableLoggingModRefBS* g1_bs = |
aoqi@0 | 158 | (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); |
aoqi@0 | 159 | g1_bs->write_ref_field_work(field, new_val); |
aoqi@0 | 160 | } |
aoqi@0 | 161 | |
aoqi@0 | 162 | void |
aoqi@0 | 163 | G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { |
aoqi@0 | 164 | volatile jbyte* byte = byte_for(mr.start()); |
aoqi@0 | 165 | jbyte* last_byte = byte_for(mr.last()); |
aoqi@0 | 166 | Thread* thr = Thread::current(); |
aoqi@0 | 167 | if (whole_heap) { |
aoqi@0 | 168 | while (byte <= last_byte) { |
aoqi@0 | 169 | *byte = dirty_card; |
aoqi@0 | 170 | byte++; |
aoqi@0 | 171 | } |
aoqi@0 | 172 | } else { |
aoqi@0 | 173 | // skip all consecutive young cards |
aoqi@0 | 174 | for (; byte <= last_byte && *byte == g1_young_gen; byte++); |
aoqi@0 | 175 | |
aoqi@0 | 176 | if (byte <= last_byte) { |
aoqi@0 | 177 | OrderAccess::storeload(); |
aoqi@0 | 178 | // Enqueue if necessary. |
aoqi@0 | 179 | if (thr->is_Java_thread()) { |
aoqi@0 | 180 | JavaThread* jt = (JavaThread*)thr; |
aoqi@0 | 181 | for (; byte <= last_byte; byte++) { |
aoqi@0 | 182 | if (*byte == g1_young_gen) { |
aoqi@0 | 183 | continue; |
aoqi@0 | 184 | } |
aoqi@0 | 185 | if (*byte != dirty_card) { |
aoqi@0 | 186 | *byte = dirty_card; |
aoqi@0 | 187 | jt->dirty_card_queue().enqueue(byte); |
aoqi@0 | 188 | } |
aoqi@0 | 189 | } |
aoqi@0 | 190 | } else { |
aoqi@0 | 191 | MutexLockerEx x(Shared_DirtyCardQ_lock, |
aoqi@0 | 192 | Mutex::_no_safepoint_check_flag); |
aoqi@0 | 193 | for (; byte <= last_byte; byte++) { |
aoqi@0 | 194 | if (*byte == g1_young_gen) { |
aoqi@0 | 195 | continue; |
aoqi@0 | 196 | } |
aoqi@0 | 197 | if (*byte != dirty_card) { |
aoqi@0 | 198 | *byte = dirty_card; |
aoqi@0 | 199 | _dcqs.shared_dirty_card_queue()->enqueue(byte); |
aoqi@0 | 200 | } |
aoqi@0 | 201 | } |
aoqi@0 | 202 | } |
aoqi@0 | 203 | } |
aoqi@0 | 204 | } |
aoqi@0 | 205 | } |