|
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"
|
|
|
26 #include "gc_implementation/g1/heapRegionSets.hpp"
|
|
|
27
|
|
|
28 //////////////////// FreeRegionList ////////////////////
|
|
|
29
|
|
|
30 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) {
|
|
|
31 if (hr->is_young()) {
|
|
|
32 return "the region should not be young";
|
|
|
33 }
|
|
|
34 // The superclass will check that the region is empty and
|
|
|
35 // not-humongous.
|
|
|
36 return HeapRegionLinkedList::verify_region_extra(hr);
|
|
|
37 }
|
|
|
38
|
|
|
39 //////////////////// MasterFreeRegionList ////////////////////
|
|
|
40
|
|
|
41 bool MasterFreeRegionList::check_mt_safety() {
|
|
|
42 // Master Free List MT safety protocol:
|
|
|
43 // (a) If we're at a safepoint, operations on the master free list
|
|
|
44 // should be invoked by either the VM thread (which will serialize
|
|
|
45 // them) or by the GC workers while holding the
|
|
|
46 // FreeList_lock.
|
|
|
47 // (b) If we're not at a safepoint, operations on the master free
|
|
|
48 // list should be invoked while holding the Heap_lock.
|
|
|
49
|
|
|
50 guarantee((SafepointSynchronize::is_at_safepoint() &&
|
|
|
51 (Thread::current()->is_VM_thread() ||
|
|
|
52 FreeList_lock->owned_by_self())) ||
|
|
|
53 (!SafepointSynchronize::is_at_safepoint() &&
|
|
|
54 Heap_lock->owned_by_self()),
|
|
|
55 hrl_ext_msg(this, "master free list MT safety protocol"));
|
|
|
56
|
|
|
57 return FreeRegionList::check_mt_safety();
|
|
|
58 }
|
|
|
59
|
|
|
60 //////////////////// SecondaryFreeRegionList ////////////////////
|
|
|
61
|
|
|
62 bool SecondaryFreeRegionList::check_mt_safety() {
|
|
|
63 // Secondary Free List MT safety protocol:
|
|
|
64 // Operations on the secondary free list should always be invoked
|
|
|
65 // while holding the SecondaryFreeList_lock.
|
|
|
66
|
|
|
67 guarantee(SecondaryFreeList_lock->owned_by_self(),
|
|
|
68 hrl_ext_msg(this, "secondary free list MT safety protocol"));
|
|
|
69
|
|
|
70 return FreeRegionList::check_mt_safety();
|
|
|
71 }
|
|
|
72
|
|
|
73 //////////////////// HumongousRegionSet ////////////////////
|
|
|
74
|
|
|
75 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) {
|
|
|
76 if (hr->is_young()) {
|
|
|
77 return "the region should not be young";
|
|
|
78 }
|
|
|
79 // The superclass will check that the region is not empty and
|
|
|
80 // humongous.
|
|
|
81 return HeapRegionSet::verify_region_extra(hr);
|
|
|
82 }
|
|
|
83
|
|
|
84 //////////////////// HumongousRegionSet ////////////////////
|
|
|
85
|
|
|
86 bool MasterHumongousRegionSet::check_mt_safety() {
|
|
|
87 // Master Humongous Set MT safety protocol:
|
|
|
88 // (a) If we're at a safepoint, operations on the master humongous
|
|
|
89 // set should be invoked by either the VM thread (which will
|
|
|
90 // serialize them) or by the GC workers while holding the
|
|
|
91 // OldSets_lock.
|
|
|
92 // (b) If we're not at a safepoint, operations on the master
|
|
|
93 // humongous set should be invoked while holding the Heap_lock.
|
|
|
94
|
|
|
95 guarantee((SafepointSynchronize::is_at_safepoint() &&
|
|
|
96 (Thread::current()->is_VM_thread() ||
|
|
|
97 OldSets_lock->owned_by_self())) ||
|
|
|
98 (!SafepointSynchronize::is_at_safepoint() &&
|
|
|
99 Heap_lock->owned_by_self()),
|
|
|
100 hrl_ext_msg(this, "master humongous set MT safety protocol"));
|
|
|
101 return HumongousRegionSet::check_mt_safety();
|
|
|
102 }
|
