Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/memory/genRemSet.cpp@da91efe96a93 (annotated)
src/share/vm/memory/genRemSet.cpp
Sat, 01 Sep 2012 13:25:18 -0400
- author
- coleenp
- date
- Sat, 01 Sep 2012 13:25:18 -0400
- changeset 4037
- da91efe96a93
- parent 2314
- f95d63e2154a
- child 5818
- ab68fc0101ce
- permissions
- -rw-r--r--
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| duke@435 | 1 | /* |
| coleenp@4037 | 2 | * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #include "precompiled.hpp" |
| coleenp@4037 | 26 | #include "classfile/classLoaderData.hpp" |
| stefank@2314 | 27 | #include "memory/cardTableRS.hpp" |
| stefank@2314 | 28 | #include "memory/genRemSet.hpp" |
| stefank@2314 | 29 | |
| duke@435 | 30 | // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
| duke@435 | 31 | // enumerate ref fields that have been modified (since the last |
| duke@435 | 32 | // enumeration.) |
| duke@435 | 33 | |
| duke@435 | 34 | uintx GenRemSet::max_alignment_constraint(Name nm) { |
| duke@435 | 35 | switch (nm) { |
| duke@435 | 36 | case GenRemSet::CardTable: |
| duke@435 | 37 | return CardTableRS::ct_max_alignment_constraint(); |
| duke@435 | 38 | default: |
| duke@435 | 39 | guarantee(false, "Unrecognized GenRemSet type."); |
| duke@435 | 40 | return (0); // Make Windows compiler happy |
| duke@435 | 41 | } |
| duke@435 | 42 | } |
| coleenp@4037 | 43 | |
| coleenp@4037 | 44 | class HasAccumulatedModifiedOopsClosure : public KlassClosure { |
| coleenp@4037 | 45 | bool _found; |
| coleenp@4037 | 46 | public: |
| coleenp@4037 | 47 | HasAccumulatedModifiedOopsClosure() : _found(false) {} |
| coleenp@4037 | 48 | void do_klass(Klass* klass) { |
| coleenp@4037 | 49 | if (_found) { |
| coleenp@4037 | 50 | return; |
| coleenp@4037 | 51 | } |
| coleenp@4037 | 52 | |
| coleenp@4037 | 53 | if (klass->has_accumulated_modified_oops()) { |
| coleenp@4037 | 54 | _found = true; |
| coleenp@4037 | 55 | } |
| coleenp@4037 | 56 | } |
| coleenp@4037 | 57 | bool found() { |
| coleenp@4037 | 58 | return _found; |
| coleenp@4037 | 59 | } |
| coleenp@4037 | 60 | }; |
| coleenp@4037 | 61 | |
| coleenp@4037 | 62 | bool KlassRemSet::mod_union_is_clear() { |
| coleenp@4037 | 63 | HasAccumulatedModifiedOopsClosure closure; |
| coleenp@4037 | 64 | ClassLoaderDataGraph::classes_do(&closure); |
| coleenp@4037 | 65 | |
| coleenp@4037 | 66 | return !closure.found(); |
| coleenp@4037 | 67 | } |
| coleenp@4037 | 68 | |
| coleenp@4037 | 69 | |
| coleenp@4037 | 70 | class ClearKlassModUnionClosure : public KlassClosure { |
| coleenp@4037 | 71 | public: |
| coleenp@4037 | 72 | void do_klass(Klass* klass) { |
| coleenp@4037 | 73 | if (klass->has_accumulated_modified_oops()) { |
| coleenp@4037 | 74 | klass->clear_accumulated_modified_oops(); |
| coleenp@4037 | 75 | } |
| coleenp@4037 | 76 | } |
| coleenp@4037 | 77 | }; |
| coleenp@4037 | 78 | |
| coleenp@4037 | 79 | void KlassRemSet::clear_mod_union() { |
| coleenp@4037 | 80 | ClearKlassModUnionClosure closure; |
| coleenp@4037 | 81 | ClassLoaderDataGraph::classes_do(&closure); |
| coleenp@4037 | 82 | } |
