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comparison src/share/vm/gc_implementation/g1/ptrQueue.cpp @ 2149:7e37af9d69ef

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7011379: G1: overly long concurrent marking cycles Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads. Reviewed-by: johnc, ysr
author tonyp
date Wed, 19 Jan 2011 09:35:17 -0500
parents f95d63e2154a
children f08d439fab8c
comparison
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2137:ffd725ff6943 2149:7e37af9d69ef
1 /* 1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
36 #endif 36 #endif
37 #ifdef TARGET_OS_FAMILY_windows 37 #ifdef TARGET_OS_FAMILY_windows
38 # include "thread_windows.inline.hpp" 38 # include "thread_windows.inline.hpp"
39 #endif 39 #endif
40 40
41 PtrQueue::PtrQueue(PtrQueueSet* qset_, bool perm, bool active) : 41 PtrQueue::PtrQueue(PtrQueueSet* qset, bool perm, bool active) :
42 _qset(qset_), _buf(NULL), _index(0), _active(active), 42 _qset(qset), _buf(NULL), _index(0), _active(active),
43 _perm(perm), _lock(NULL) 43 _perm(perm), _lock(NULL)
44 {} 44 {}
45 45
46 void PtrQueue::flush() { 46 void PtrQueue::flush() {
47 if (!_perm && _buf != NULL) { 47 if (!_perm && _buf != NULL) {
151 n--; 151 n--;
152 } 152 }
153 } 153 }
154 154
155 void PtrQueue::handle_zero_index() { 155 void PtrQueue::handle_zero_index() {
156 assert(0 == _index, "Precondition."); 156 assert(_index == 0, "Precondition.");
157
157 // This thread records the full buffer and allocates a new one (while 158 // This thread records the full buffer and allocates a new one (while
158 // holding the lock if there is one). 159 // holding the lock if there is one).
159 if (_buf != NULL) { 160 if (_buf != NULL) {
161 if (!should_enqueue_buffer()) {
162 assert(_index > 0, "the buffer can only be re-used if it's not full");
163 return;
164 }
165
160 if (_lock) { 166 if (_lock) {
161 assert(_lock->owned_by_self(), "Required."); 167 assert(_lock->owned_by_self(), "Required.");
162 168
163 // The current PtrQ may be the shared dirty card queue and 169 // The current PtrQ may be the shared dirty card queue and
164 // may be being manipulated by more than one worker thread 170 // may be being manipulated by more than one worker thread