Tue, 14 Jul 2009 15:40:39 -0700
6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
ysr@777 | 1 | /* |
ysr@777 | 2 | * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
ysr@777 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
ysr@777 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
ysr@777 | 21 | * have any questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
ysr@777 | 25 | # include "incls/_precompiled.incl" |
ysr@777 | 26 | # include "incls/_satbQueue.cpp.incl" |
ysr@777 | 27 | |
ysr@777 | 28 | void ObjPtrQueue::apply_closure(ObjectClosure* cl) { |
ysr@777 | 29 | if (_buf != NULL) { |
ysr@777 | 30 | apply_closure_to_buffer(cl, _buf, _index, _sz); |
ysr@777 | 31 | _index = _sz; |
ysr@777 | 32 | } |
ysr@777 | 33 | } |
ysr@777 | 34 | |
ysr@777 | 35 | void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl, |
ysr@777 | 36 | void** buf, size_t index, size_t sz) { |
ysr@777 | 37 | if (cl == NULL) return; |
ysr@777 | 38 | for (size_t i = index; i < sz; i += oopSize) { |
ysr@777 | 39 | oop obj = (oop)buf[byte_index_to_index((int)i)]; |
ysr@777 | 40 | // There can be NULL entries because of destructors. |
ysr@777 | 41 | if (obj != NULL) { |
ysr@777 | 42 | cl->do_object(obj); |
ysr@777 | 43 | } |
ysr@777 | 44 | } |
ysr@777 | 45 | } |
ysr@1280 | 46 | |
ysr@1280 | 47 | #ifdef ASSERT |
ysr@1280 | 48 | void ObjPtrQueue::verify_oops_in_buffer() { |
ysr@1280 | 49 | if (_buf == NULL) return; |
ysr@1280 | 50 | for (size_t i = _index; i < _sz; i += oopSize) { |
ysr@1280 | 51 | oop obj = (oop)_buf[byte_index_to_index((int)i)]; |
ysr@1280 | 52 | assert(obj != NULL && obj->is_oop(true /* ignore mark word */), |
ysr@1280 | 53 | "Not an oop"); |
ysr@1280 | 54 | } |
ysr@1280 | 55 | } |
ysr@1280 | 56 | #endif |
ysr@1280 | 57 | |
ysr@777 | 58 | #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
ysr@777 | 59 | #pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
ysr@777 | 60 | #endif // _MSC_VER |
ysr@777 | 61 | |
ysr@777 | 62 | |
ysr@777 | 63 | SATBMarkQueueSet::SATBMarkQueueSet() : |
ysr@777 | 64 | PtrQueueSet(), |
ysr@777 | 65 | _closure(NULL), _par_closures(NULL), |
ysr@777 | 66 | _shared_satb_queue(this, true /*perm*/) |
ysr@777 | 67 | {} |
ysr@777 | 68 | |
ysr@777 | 69 | void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, |
ysr@777 | 70 | int max_completed_queue, |
ysr@777 | 71 | Mutex* lock) { |
ysr@777 | 72 | PtrQueueSet::initialize(cbl_mon, fl_lock, max_completed_queue); |
ysr@777 | 73 | _shared_satb_queue.set_lock(lock); |
ysr@777 | 74 | if (ParallelGCThreads > 0) { |
ysr@777 | 75 | _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads); |
ysr@777 | 76 | } |
ysr@777 | 77 | } |
ysr@777 | 78 | |
ysr@777 | 79 | |
ysr@777 | 80 | void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) { |
ysr@1280 | 81 | DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();) |
ysr@777 | 82 | t->satb_mark_queue().handle_zero_index(); |
ysr@777 | 83 | } |
ysr@777 | 84 | |
ysr@777 | 85 | void SATBMarkQueueSet::set_active_all_threads(bool b) { |
ysr@777 | 86 | _all_active = b; |
ysr@777 | 87 | for(JavaThread* t = Threads::first(); t; t = t->next()) { |
ysr@777 | 88 | t->satb_mark_queue().set_active(b); |
ysr@777 | 89 | } |
ysr@777 | 90 | } |
ysr@777 | 91 | |
ysr@777 | 92 | void SATBMarkQueueSet::set_closure(ObjectClosure* closure) { |
ysr@777 | 93 | _closure = closure; |
ysr@777 | 94 | } |
ysr@777 | 95 | |
ysr@777 | 96 | void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) { |
ysr@777 | 97 | assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition"); |
ysr@777 | 98 | _par_closures[i] = par_closure; |
ysr@777 | 99 | } |
ysr@777 | 100 | |
ysr@777 | 101 | void SATBMarkQueueSet::iterate_closure_all_threads() { |
ysr@777 | 102 | for(JavaThread* t = Threads::first(); t; t = t->next()) { |
ysr@777 | 103 | t->satb_mark_queue().apply_closure(_closure); |
ysr@777 | 104 | } |
ysr@777 | 105 | shared_satb_queue()->apply_closure(_closure); |
ysr@777 | 106 | } |
ysr@777 | 107 | |
ysr@777 | 108 | void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) { |
ysr@777 | 109 | SharedHeap* sh = SharedHeap::heap(); |
ysr@777 | 110 | int parity = sh->strong_roots_parity(); |
ysr@777 | 111 | |
ysr@777 | 112 | for(JavaThread* t = Threads::first(); t; t = t->next()) { |
ysr@777 | 113 | if (t->claim_oops_do(true, parity)) { |
ysr@777 | 114 | t->satb_mark_queue().apply_closure(_par_closures[worker]); |
ysr@777 | 115 | } |
ysr@777 | 116 | } |
ysr@777 | 117 | // We'll have worker 0 do this one. |
ysr@777 | 118 | if (worker == 0) { |
ysr@777 | 119 | shared_satb_queue()->apply_closure(_par_closures[0]); |
ysr@777 | 120 | } |
ysr@777 | 121 | } |
ysr@777 | 122 | |
ysr@777 | 123 | bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par, |
ysr@777 | 124 | int worker) { |
ysr@777 | 125 | CompletedBufferNode* nd = NULL; |
ysr@777 | 126 | { |
ysr@777 | 127 | MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
ysr@777 | 128 | if (_completed_buffers_head != NULL) { |
ysr@777 | 129 | nd = _completed_buffers_head; |
ysr@777 | 130 | _completed_buffers_head = nd->next; |
ysr@777 | 131 | if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
ysr@777 | 132 | _n_completed_buffers--; |
ysr@777 | 133 | if (_n_completed_buffers == 0) _process_completed = false; |
ysr@777 | 134 | } |
ysr@777 | 135 | } |
ysr@777 | 136 | ObjectClosure* cl = (par ? _par_closures[worker] : _closure); |
ysr@777 | 137 | if (nd != NULL) { |
ysr@777 | 138 | ObjPtrQueue::apply_closure_to_buffer(cl, nd->buf, 0, _sz); |
ysr@777 | 139 | deallocate_buffer(nd->buf); |
ysr@777 | 140 | delete nd; |
ysr@777 | 141 | return true; |
ysr@777 | 142 | } else { |
ysr@777 | 143 | return false; |
ysr@777 | 144 | } |
ysr@777 | 145 | } |
ysr@777 | 146 | |
ysr@777 | 147 | void SATBMarkQueueSet::abandon_partial_marking() { |
ysr@777 | 148 | CompletedBufferNode* buffers_to_delete = NULL; |
ysr@777 | 149 | { |
ysr@777 | 150 | MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); |
ysr@777 | 151 | while (_completed_buffers_head != NULL) { |
ysr@777 | 152 | CompletedBufferNode* nd = _completed_buffers_head; |
ysr@777 | 153 | _completed_buffers_head = nd->next; |
ysr@777 | 154 | nd->next = buffers_to_delete; |
ysr@777 | 155 | buffers_to_delete = nd; |
ysr@777 | 156 | } |
ysr@777 | 157 | _completed_buffers_tail = NULL; |
ysr@777 | 158 | _n_completed_buffers = 0; |
ysr@1280 | 159 | DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
ysr@777 | 160 | } |
ysr@777 | 161 | while (buffers_to_delete != NULL) { |
ysr@777 | 162 | CompletedBufferNode* nd = buffers_to_delete; |
ysr@777 | 163 | buffers_to_delete = nd->next; |
ysr@777 | 164 | deallocate_buffer(nd->buf); |
ysr@777 | 165 | delete nd; |
ysr@777 | 166 | } |
ysr@777 | 167 | assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
ysr@777 | 168 | // So we can safely manipulate these queues. |
ysr@777 | 169 | for (JavaThread* t = Threads::first(); t; t = t->next()) { |
ysr@777 | 170 | t->satb_mark_queue().reset(); |
ysr@777 | 171 | } |
ysr@777 | 172 | shared_satb_queue()->reset(); |
ysr@777 | 173 | } |