Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp @ 17755:96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set.
Reviewed-by: brutisso
author | tschatzl |
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date | Mon, 24 Mar 2014 15:30:36 +0100 |
parents | aa6f2ea19d8f |
children | 3205e78d8193 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" | |
27 #include "gc_implementation/g1/heapRegion.hpp" | |
28 #include "gc_implementation/g1/satbQueue.hpp" | |
29 #include "runtime/mutexLocker.hpp" | |
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30 #include "runtime/thread.inline.hpp" |
342 | 31 |
32 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap, | |
33 int max_covered_regions) : | |
34 CardTableModRefBSForCTRS(whole_heap, max_covered_regions) | |
35 { | |
36 _kind = G1SATBCT; | |
37 } | |
38 | |
39 | |
40 void G1SATBCardTableModRefBS::enqueue(oop pre_val) { | |
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41 // Nulls should have been already filtered. |
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42 assert(pre_val->is_oop(true), "Error"); |
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43 |
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44 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
342 | 45 Thread* thr = Thread::current(); |
46 if (thr->is_Java_thread()) { | |
47 JavaThread* jt = (JavaThread*)thr; | |
48 jt->satb_mark_queue().enqueue(pre_val); | |
49 } else { | |
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50 MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag); |
342 | 51 JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val); |
52 } | |
53 } | |
54 | |
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55 template <class T> void |
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56 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) { |
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57 if (!JavaThread::satb_mark_queue_set().is_active()) return; |
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58 T* elem_ptr = dst; |
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59 for (int i = 0; i < count; i++, elem_ptr++) { |
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60 T heap_oop = oopDesc::load_heap_oop(elem_ptr); |
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61 if (!oopDesc::is_null(heap_oop)) { |
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62 enqueue(oopDesc::decode_heap_oop_not_null(heap_oop)); |
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63 } |
342 | 64 } |
65 } | |
66 | |
12343 | 67 bool G1SATBCardTableModRefBS::mark_card_deferred(size_t card_index) { |
68 jbyte val = _byte_map[card_index]; | |
69 // It's already processed | |
70 if ((val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val()) { | |
71 return false; | |
72 } | |
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73 |
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74 if (val == g1_young_gen) { |
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75 // the card is for a young gen region. We don't need to keep track of all pointers into young |
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76 return false; |
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77 } |
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78 |
12343 | 79 // Cached bit can be installed either on a clean card or on a claimed card. |
80 jbyte new_val = val; | |
81 if (val == clean_card_val()) { | |
82 new_val = (jbyte)deferred_card_val(); | |
83 } else { | |
84 if (val & claimed_card_val()) { | |
85 new_val = val | (jbyte)deferred_card_val(); | |
86 } | |
87 } | |
88 if (new_val != val) { | |
89 Atomic::cmpxchg(new_val, &_byte_map[card_index], val); | |
90 } | |
91 return true; | |
92 } | |
93 | |
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94 void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) { |
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95 jbyte *const first = byte_for(mr.start()); |
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96 jbyte *const last = byte_after(mr.last()); |
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97 |
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98 memset(first, g1_young_gen, last - first); |
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99 } |
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100 |
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101 #ifndef PRODUCT |
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102 void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) { |
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103 verify_region(mr, g1_young_gen, true); |
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104 } |
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105 #endif |
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106 |
342 | 107 G1SATBCardTableLoggingModRefBS:: |
108 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
109 int max_covered_regions) : | |
110 G1SATBCardTableModRefBS(whole_heap, max_covered_regions), | |
111 _dcqs(JavaThread::dirty_card_queue_set()) | |
112 { | |
113 _kind = G1SATBCTLogging; | |
114 } | |
115 | |
116 void | |
117 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field, | |
118 oop new_val) { | |
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119 volatile jbyte* byte = byte_for(field); |
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120 if (*byte == g1_young_gen) { |
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121 return; |
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122 } |
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123 OrderAccess::storeload(); |
342 | 124 if (*byte != dirty_card) { |
125 *byte = dirty_card; | |
126 Thread* thr = Thread::current(); | |
127 if (thr->is_Java_thread()) { | |
128 JavaThread* jt = (JavaThread*)thr; | |
129 jt->dirty_card_queue().enqueue(byte); | |
130 } else { | |
131 MutexLockerEx x(Shared_DirtyCardQ_lock, | |
132 Mutex::_no_safepoint_check_flag); | |
133 _dcqs.shared_dirty_card_queue()->enqueue(byte); | |
134 } | |
135 } | |
136 } | |
137 | |
138 void | |
139 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field, | |
140 oop new_val) { | |
141 uintptr_t field_uint = (uintptr_t)field; | |
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142 uintptr_t new_val_uint = cast_from_oop<uintptr_t>(new_val); |
342 | 143 uintptr_t comb = field_uint ^ new_val_uint; |
144 comb = comb >> HeapRegion::LogOfHRGrainBytes; | |
145 if (comb == 0) return; | |
146 if (new_val == NULL) return; | |
147 // Otherwise, log it. | |
148 G1SATBCardTableLoggingModRefBS* g1_bs = | |
149 (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set(); | |
150 g1_bs->write_ref_field_work(field, new_val); | |
151 } | |
152 | |
153 void | |
154 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) { | |
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155 volatile jbyte* byte = byte_for(mr.start()); |
342 | 156 jbyte* last_byte = byte_for(mr.last()); |
157 Thread* thr = Thread::current(); | |
158 if (whole_heap) { | |
159 while (byte <= last_byte) { | |
160 *byte = dirty_card; | |
161 byte++; | |
162 } | |
163 } else { | |
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164 // skip all consecutive young cards |
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165 for (; byte <= last_byte && *byte == g1_young_gen; byte++); |
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166 |
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167 if (byte <= last_byte) { |
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168 OrderAccess::storeload(); |
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169 // Enqueue if necessary. |
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170 if (thr->is_Java_thread()) { |
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171 JavaThread* jt = (JavaThread*)thr; |
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172 for (; byte <= last_byte; byte++) { |
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173 if (*byte == g1_young_gen) { |
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174 continue; |
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175 } |
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176 if (*byte != dirty_card) { |
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177 *byte = dirty_card; |
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178 jt->dirty_card_queue().enqueue(byte); |
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179 } |
342 | 180 } |
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181 } else { |
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182 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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183 Mutex::_no_safepoint_check_flag); |
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184 for (; byte <= last_byte; byte++) { |
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185 if (*byte == g1_young_gen) { |
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186 continue; |
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187 } |
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188 if (*byte != dirty_card) { |
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189 *byte = dirty_card; |
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190 _dcqs.shared_dirty_card_queue()->enqueue(byte); |
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191 } |
342 | 192 } |
193 } | |
194 } | |
195 } | |
196 } |