Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionSets.cpp @ 10100:9aa8d8037ee3
Merge
| author | mgerdin |
|---|---|
| date | Tue, 16 Apr 2013 12:46:24 +0200 |
| parents | 8aae2050e83e |
| children | 58fc1b1523dc |
| rev | line source |
|---|---|
| 2152 | 1 /* |
| 2 * Copyright (c) 2011, 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" | |
|
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26 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 2152 | 27 #include "gc_implementation/g1/heapRegionSets.hpp" |
| 28 | |
| 4072 | 29 // Note on the check_mt_safety() methods below: |
| 30 // | |
| 31 // Verification of the "master" heap region sets / lists that are | |
| 32 // maintained by G1CollectedHeap is always done during a STW pause and | |
| 33 // by the VM thread at the start / end of the pause. The standard | |
| 34 // verification methods all assert check_mt_safety(). This is | |
| 35 // important as it ensures that verification is done without | |
| 36 // concurrent updates taking place at the same time. It follows, that, | |
| 37 // for the "master" heap region sets / lists, the check_mt_safety() | |
| 38 // method should include the VM thread / STW case. | |
| 39 | |
| 2152 | 40 //////////////////// FreeRegionList //////////////////// |
| 41 | |
| 42 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) { | |
| 43 if (hr->is_young()) { | |
| 44 return "the region should not be young"; | |
| 45 } | |
| 46 // The superclass will check that the region is empty and | |
| 4072 | 47 // not humongous. |
| 2152 | 48 return HeapRegionLinkedList::verify_region_extra(hr); |
| 49 } | |
| 50 | |
| 51 //////////////////// MasterFreeRegionList //////////////////// | |
| 52 | |
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53 const char* MasterFreeRegionList::verify_region_extra(HeapRegion* hr) { |
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54 // We should reset the RSet for parallel iteration before we add it |
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55 // to the master free list so that it is ready when the region is |
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56 // re-allocated. |
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57 if (!hr->rem_set()->verify_ready_for_par_iteration()) { |
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58 return "the region's RSet should be ready for parallel iteration"; |
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59 } |
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60 return FreeRegionList::verify_region_extra(hr); |
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61 } |
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62 |
| 2152 | 63 bool MasterFreeRegionList::check_mt_safety() { |
| 64 // Master Free List MT safety protocol: | |
| 65 // (a) If we're at a safepoint, operations on the master free list | |
| 66 // should be invoked by either the VM thread (which will serialize | |
| 67 // them) or by the GC workers while holding the | |
| 68 // FreeList_lock. | |
| 69 // (b) If we're not at a safepoint, operations on the master free | |
| 70 // list should be invoked while holding the Heap_lock. | |
| 71 | |
| 4072 | 72 if (SafepointSynchronize::is_at_safepoint()) { |
| 73 guarantee(Thread::current()->is_VM_thread() || | |
| 74 FreeList_lock->owned_by_self(), | |
| 75 hrs_ext_msg(this, "master free list MT safety protocol " | |
| 76 "at a safepoint")); | |
| 77 } else { | |
| 78 guarantee(Heap_lock->owned_by_self(), | |
| 79 hrs_ext_msg(this, "master free list MT safety protocol " | |
| 80 "outside a safepoint")); | |
| 81 } | |
| 2152 | 82 |
| 83 return FreeRegionList::check_mt_safety(); | |
| 84 } | |
| 85 | |
| 86 //////////////////// SecondaryFreeRegionList //////////////////// | |
| 87 | |
| 88 bool SecondaryFreeRegionList::check_mt_safety() { | |
| 89 // Secondary Free List MT safety protocol: | |
| 90 // Operations on the secondary free list should always be invoked | |
| 91 // while holding the SecondaryFreeList_lock. | |
| 92 | |
| 93 guarantee(SecondaryFreeList_lock->owned_by_self(), | |
| 2361 | 94 hrs_ext_msg(this, "secondary free list MT safety protocol")); |
| 2152 | 95 |
| 96 return FreeRegionList::check_mt_safety(); | |
| 97 } | |
| 98 | |
| 4072 | 99 //////////////////// OldRegionSet //////////////////// |
| 100 | |
| 101 const char* OldRegionSet::verify_region_extra(HeapRegion* hr) { | |
| 102 if (hr->is_young()) { | |
| 103 return "the region should not be young"; | |
| 104 } | |
| 105 // The superclass will check that the region is not empty and not | |
| 106 // humongous. | |
| 107 return HeapRegionSet::verify_region_extra(hr); | |
| 108 } | |
| 109 | |
| 110 //////////////////// MasterOldRegionSet //////////////////// | |
| 111 | |
| 112 bool MasterOldRegionSet::check_mt_safety() { | |
| 113 // Master Old Set MT safety protocol: | |
| 114 // (a) If we're at a safepoint, operations on the master old set | |
| 115 // should be invoked: | |
| 116 // - by the VM thread (which will serialize them), or | |
| 117 // - by the GC workers while holding the FreeList_lock, if we're | |
| 118 // at a safepoint for an evacuation pause (this lock is taken | |
| 119 // anyway when an GC alloc region is retired so that a new one | |
| 120 // is allocated from the free list), or | |
| 121 // - by the GC workers while holding the OldSets_lock, if we're at a | |
| 122 // safepoint for a cleanup pause. | |
| 123 // (b) If we're not at a safepoint, operations on the master old set | |
| 124 // should be invoked while holding the Heap_lock. | |
| 125 | |
| 126 if (SafepointSynchronize::is_at_safepoint()) { | |
| 127 guarantee(Thread::current()->is_VM_thread() || | |
| 128 _phase == HRSPhaseEvacuation && FreeList_lock->owned_by_self() || | |
| 129 _phase == HRSPhaseCleanup && OldSets_lock->owned_by_self(), | |
| 130 hrs_ext_msg(this, "master old set MT safety protocol " | |
| 131 "at a safepoint")); | |
| 132 } else { | |
| 133 guarantee(Heap_lock->owned_by_self(), | |
| 134 hrs_ext_msg(this, "master old set MT safety protocol " | |
| 135 "outside a safepoint")); | |
| 136 } | |
| 137 | |
| 138 return OldRegionSet::check_mt_safety(); | |
| 139 } | |
| 140 | |
| 2152 | 141 //////////////////// HumongousRegionSet //////////////////// |
| 142 | |
| 143 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) { | |
| 144 if (hr->is_young()) { | |
| 145 return "the region should not be young"; | |
| 146 } | |
| 147 // The superclass will check that the region is not empty and | |
| 148 // humongous. | |
| 149 return HeapRegionSet::verify_region_extra(hr); | |
| 150 } | |
| 151 | |
| 2361 | 152 //////////////////// MasterHumongousRegionSet //////////////////// |
| 2152 | 153 |
| 154 bool MasterHumongousRegionSet::check_mt_safety() { | |
| 155 // Master Humongous Set MT safety protocol: | |
| 156 // (a) If we're at a safepoint, operations on the master humongous | |
| 157 // set should be invoked by either the VM thread (which will | |
| 158 // serialize them) or by the GC workers while holding the | |
| 159 // OldSets_lock. | |
| 160 // (b) If we're not at a safepoint, operations on the master | |
| 161 // humongous set should be invoked while holding the Heap_lock. | |
| 162 | |
| 4072 | 163 if (SafepointSynchronize::is_at_safepoint()) { |
| 164 guarantee(Thread::current()->is_VM_thread() || | |
| 165 OldSets_lock->owned_by_self(), | |
| 166 hrs_ext_msg(this, "master humongous set MT safety protocol " | |
| 167 "at a safepoint")); | |
| 168 } else { | |
| 169 guarantee(Heap_lock->owned_by_self(), | |
| 170 hrs_ext_msg(this, "master humongous set MT safety protocol " | |
| 171 "outside a safepoint")); | |
| 172 } | |
| 173 | |
| 2152 | 174 return HumongousRegionSet::check_mt_safety(); |
| 175 } |