1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,205 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
1.30 +#include "gc_implementation/g1/heapRegion.hpp"
1.31 +#include "gc_implementation/g1/satbQueue.hpp"
1.32 +#include "runtime/mutexLocker.hpp"
1.33 +#include "runtime/thread.inline.hpp"
1.34 +
1.35 +G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
1.36 + int max_covered_regions) :
1.37 + CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
1.38 +{
1.39 + _kind = G1SATBCT;
1.40 +}
1.41 +
1.42 +
1.43 +void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
1.44 + // Nulls should have been already filtered.
1.45 + assert(pre_val->is_oop(true), "Error");
1.46 +
1.47 + if (!JavaThread::satb_mark_queue_set().is_active()) return;
1.48 + Thread* thr = Thread::current();
1.49 + if (thr->is_Java_thread()) {
1.50 + JavaThread* jt = (JavaThread*)thr;
1.51 + jt->satb_mark_queue().enqueue(pre_val);
1.52 + } else {
1.53 + MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
1.54 + JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
1.55 + }
1.56 +}
1.57 +
1.58 +template <class T> void
1.59 +G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
1.60 + if (!JavaThread::satb_mark_queue_set().is_active()) return;
1.61 + T* elem_ptr = dst;
1.62 + for (int i = 0; i < count; i++, elem_ptr++) {
1.63 + T heap_oop = oopDesc::load_heap_oop(elem_ptr);
1.64 + if (!oopDesc::is_null(heap_oop)) {
1.65 + enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
1.66 + }
1.67 + }
1.68 +}
1.69 +
1.70 +bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) {
1.71 + jbyte val = _byte_map[card_index];
1.72 + // It's already processed
1.73 + if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) {
1.74 + return false;
1.75 + }
1.76 +
1.77 + if (val == g1_young_gen) {
1.78 + // the card is for a young gen region. We don't need to keep track of all pointers into young
1.79 + return false;
1.80 + }
1.81 +
1.82 + // Cached bit can be installed either on a clean card or on a claimed card.
1.83 + jbyte new_val = val;
1.84 + if (val == clean_card_val()) {
1.85 + new_val = (jbyte)deferred_card_val();
1.86 + } else {
1.87 + if (val & claimed_card_val()) {
1.88 + new_val = val | (jbyte)deferred_card_val();
1.89 + }
1.90 + }
1.91 + if (new_val != val) {
1.92 + Atomic::cmpxchg(new_val, &_byte_map[card_index], val);
1.93 + }
1.94 + return true;
1.95 +}
1.96 +
1.97 +void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) {
1.98 + jbyte *const first = byte_for(mr.start());
1.99 + jbyte *const last = byte_after(mr.last());
1.100 +
1.101 + // Below we may use an explicit loop instead of memset() because on
1.102 + // certain platforms memset() can give concurrent readers phantom zeros.
1.103 + if (UseMemSetInBOT) {
1.104 + memset(first, g1_young_gen, last - first);
1.105 + } else {
1.106 + for (jbyte* i = first; i < last; i++) {
1.107 + *i = g1_young_gen;
1.108 + }
1.109 + }
1.110 +}
1.111 +
1.112 +#ifndef PRODUCT
1.113 +void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) {
1.114 + verify_region(mr, g1_young_gen, true);
1.115 +}
1.116 +#endif
1.117 +
1.118 +G1SATBCardTableLoggingModRefBS::
1.119 +G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
1.120 + int max_covered_regions) :
1.121 + G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
1.122 + _dcqs(JavaThread::dirty_card_queue_set())
1.123 +{
1.124 + _kind = G1SATBCTLogging;
1.125 +}
1.126 +
1.127 +void
1.128 +G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
1.129 + oop new_val,
1.130 + bool release) {
1.131 + volatile jbyte* byte = byte_for(field);
1.132 + if (*byte == g1_young_gen) {
1.133 + return;
1.134 + }
1.135 + OrderAccess::storeload();
1.136 + if (*byte != dirty_card) {
1.137 + *byte = dirty_card;
1.138 + Thread* thr = Thread::current();
1.139 + if (thr->is_Java_thread()) {
1.140 + JavaThread* jt = (JavaThread*)thr;
1.141 + jt->dirty_card_queue().enqueue(byte);
1.142 + } else {
1.143 + MutexLockerEx x(Shared_DirtyCardQ_lock,
1.144 + Mutex::_no_safepoint_check_flag);
1.145 + _dcqs.shared_dirty_card_queue()->enqueue(byte);
1.146 + }
1.147 + }
1.148 +}
1.149 +
1.150 +void
1.151 +G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
1.152 + oop new_val) {
1.153 + uintptr_t field_uint = (uintptr_t)field;
1.154 + uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val);
1.155 + uintptr_t comb = field_uint ^ new_val_uint;
1.156 + comb = comb >> HeapRegion::LogOfHRGrainBytes;
1.157 + if (comb == 0) return;
1.158 + if (new_val == NULL) return;
1.159 + // Otherwise, log it.
1.160 + G1SATBCardTableLoggingModRefBS* g1_bs =
1.161 + (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
1.162 + g1_bs->write_ref_field_work(field, new_val);
1.163 +}
1.164 +
1.165 +void
1.166 +G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
1.167 + volatile jbyte* byte = byte_for(mr.start());
1.168 + jbyte* last_byte = byte_for(mr.last());
1.169 + Thread* thr = Thread::current();
1.170 + if (whole_heap) {
1.171 + while (byte <= last_byte) {
1.172 + *byte = dirty_card;
1.173 + byte++;
1.174 + }
1.175 + } else {
1.176 + // skip all consecutive young cards
1.177 + for (; byte <= last_byte && *byte == g1_young_gen; byte++);
1.178 +
1.179 + if (byte <= last_byte) {
1.180 + OrderAccess::storeload();
1.181 + // Enqueue if necessary.
1.182 + if (thr->is_Java_thread()) {
1.183 + JavaThread* jt = (JavaThread*)thr;
1.184 + for (; byte <= last_byte; byte++) {
1.185 + if (*byte == g1_young_gen) {
1.186 + continue;
1.187 + }
1.188 + if (*byte != dirty_card) {
1.189 + *byte = dirty_card;
1.190 + jt->dirty_card_queue().enqueue(byte);
1.191 + }
1.192 + }
1.193 + } else {
1.194 + MutexLockerEx x(Shared_DirtyCardQ_lock,
1.195 + Mutex::_no_safepoint_check_flag);
1.196 + for (; byte <= last_byte; byte++) {
1.197 + if (*byte == g1_young_gen) {
1.198 + continue;
1.199 + }
1.200 + if (*byte != dirty_card) {
1.201 + *byte = dirty_card;
1.202 + _dcqs.shared_dirty_card_queue()->enqueue(byte);
1.203 + }
1.204 + }
1.205 + }
1.206 + }
1.207 + }
1.208 +}
