1 /* 2 * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "gc/g1/g1CollectedHeap.inline.hpp" 28 #include "gc/g1/satbMarkQueue.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/mutexLocker.hpp" 33 #include "runtime/safepoint.hpp" 34 #include "runtime/thread.hpp" 35 #include "runtime/threadSMR.hpp" 36 #include "runtime/vmThread.hpp" 37 38 SATBMarkQueue::SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent) : 39 // SATB queues are only active during marking cycles. We create 40 // them with their active field set to false. If a thread is 41 // created during a cycle and its SATB queue needs to be activated 42 // before the thread starts running, we'll need to set its active 43 // field to true. This is done in JavaThread::initialize_queues(). 44 PtrQueue(qset, permanent, false /* active */) 45 { } 46 47 void SATBMarkQueue::flush() { 48 // Filter now to possibly save work later. If filtering empties the 49 // buffer then flush_impl can deallocate the buffer. 50 filter(); 51 flush_impl(); 52 } 53 54 // Return true if a SATB buffer entry refers to an object that 55 // requires marking. 56 // 57 // The entry must point into the G1 heap. In particular, it must not 58 // be a NULL pointer. NULL pointers are pre-filtered and never 59 // inserted into a SATB buffer. 60 // 61 // An entry that is below the NTAMS pointer for the containing heap 62 // region requires marking. Such an entry must point to a valid object. 63 // | 1 /* 2 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "gc/g1/g1CollectedHeap.inline.hpp" 28 #include "gc/g1/satbMarkQueue.hpp" 29 #include "gc/shared/collectedHeap.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/mutexLocker.hpp" 33 #include "runtime/safepoint.hpp" 34 #include "runtime/thread.hpp" 35 #include "runtime/threadSMR.hpp" 36 #include "runtime/vmThread.hpp" 37 38 SATBMarkQueue::SATBMarkQueue(SATBMarkQueueSet* qset, bool permanent) : 39 // SATB queues are only active during marking cycles. We create 40 // them with their active field set to false. If a thread is 41 // created during a cycle and its SATB queue needs to be activated 42 // before the thread starts running, we'll need to set its active 43 // field to true. This is done in G1SATBCardTableLoggingModRefBS:: 44 // on_thread_attach(). 45 PtrQueue(qset, permanent, false /* active */) 46 { } 47 48 void SATBMarkQueue::flush() { 49 // Filter now to possibly save work later. If filtering empties the 50 // buffer then flush_impl can deallocate the buffer. 51 filter(); 52 flush_impl(); 53 } 54 55 // Return true if a SATB buffer entry refers to an object that 56 // requires marking. 57 // 58 // The entry must point into the G1 heap. In particular, it must not 59 // be a NULL pointer. NULL pointers are pre-filtered and never 60 // inserted into a SATB buffer. 61 // 62 // An entry that is below the NTAMS pointer for the containing heap 63 // region requires marking. Such an entry must point to a valid object. 64 // |