Wed, 26 Jun 2013 16:58:37 +0200
8013590: NPG: Add a memory pool MXBean for Metaspace
Reviewed-by: jmasa, mgerdin
1 /*
2 * Copyright (c) 2001, 2012, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.hpp"
27 #include "memory/cardTableRS.hpp"
28 #include "memory/genRemSet.hpp"
30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and
31 // enumerate ref fields that have been modified (since the last
32 // enumeration.)
34 uintx GenRemSet::max_alignment_constraint(Name nm) {
35 switch (nm) {
36 case GenRemSet::CardTable:
37 return CardTableRS::ct_max_alignment_constraint();
38 default:
39 guarantee(false, "Unrecognized GenRemSet type.");
40 return (0); // Make Windows compiler happy
41 }
42 }
44 class HasAccumulatedModifiedOopsClosure : public KlassClosure {
45 bool _found;
46 public:
47 HasAccumulatedModifiedOopsClosure() : _found(false) {}
48 void do_klass(Klass* klass) {
49 if (_found) {
50 return;
51 }
53 if (klass->has_accumulated_modified_oops()) {
54 _found = true;
55 }
56 }
57 bool found() {
58 return _found;
59 }
60 };
62 bool KlassRemSet::mod_union_is_clear() {
63 HasAccumulatedModifiedOopsClosure closure;
64 ClassLoaderDataGraph::classes_do(&closure);
66 return !closure.found();
67 }
70 class ClearKlassModUnionClosure : public KlassClosure {
71 public:
72 void do_klass(Klass* klass) {
73 if (klass->has_accumulated_modified_oops()) {
74 klass->clear_accumulated_modified_oops();
75 }
76 }
77 };
79 void KlassRemSet::clear_mod_union() {
80 ClearKlassModUnionClosure closure;
81 ClassLoaderDataGraph::classes_do(&closure);
82 }