Wed, 26 Jun 2013 16:58:37 +0200
8013590: NPG: Add a memory pool MXBean for Metaspace
Reviewed-by: jmasa, mgerdin
duke@435 | 1 | /* |
coleenp@4037 | 2 | * Copyright (c) 2000, 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 | #ifndef SHARE_VM_MEMORY_MEMREGION_HPP |
stefank@2314 | 26 | #define SHARE_VM_MEMORY_MEMREGION_HPP |
stefank@2314 | 27 | |
stefank@2314 | 28 | #include "memory/allocation.hpp" |
stefank@2314 | 29 | #include "utilities/debug.hpp" |
stefank@2314 | 30 | #include "utilities/globalDefinitions.hpp" |
stefank@2314 | 31 | |
duke@435 | 32 | // A very simple data structure representing a contigous region |
duke@435 | 33 | // region of address space. |
duke@435 | 34 | |
duke@435 | 35 | // Note that MemRegions are passed by value, not by reference. |
duke@435 | 36 | // The intent is that they remain very small and contain no |
minqi@5103 | 37 | // objects. _ValueObj should never be allocated in heap but we do |
minqi@5103 | 38 | // create MemRegions (in CardTableModRefBS) in heap so operator |
minqi@5103 | 39 | // new and operator new [] added for this special case. |
duke@435 | 40 | |
coleenp@4037 | 41 | class MetaWord; |
coleenp@4037 | 42 | |
duke@435 | 43 | class MemRegion VALUE_OBJ_CLASS_SPEC { |
duke@435 | 44 | friend class VMStructs; |
duke@435 | 45 | private: |
duke@435 | 46 | HeapWord* _start; |
duke@435 | 47 | size_t _word_size; |
duke@435 | 48 | |
duke@435 | 49 | public: |
duke@435 | 50 | MemRegion() : _start(NULL), _word_size(0) {}; |
duke@435 | 51 | MemRegion(HeapWord* start, size_t word_size) : |
duke@435 | 52 | _start(start), _word_size(word_size) {}; |
duke@435 | 53 | MemRegion(HeapWord* start, HeapWord* end) : |
duke@435 | 54 | _start(start), _word_size(pointer_delta(end, start)) { |
duke@435 | 55 | assert(end >= start, "incorrect constructor arguments"); |
duke@435 | 56 | } |
coleenp@4037 | 57 | MemRegion(MetaWord* start, MetaWord* end) : |
coleenp@4037 | 58 | _start((HeapWord*)start), _word_size(pointer_delta(end, start)) { |
coleenp@4037 | 59 | assert(end >= start, "incorrect constructor arguments"); |
coleenp@4037 | 60 | } |
duke@435 | 61 | |
duke@435 | 62 | MemRegion(const MemRegion& mr): _start(mr._start), _word_size(mr._word_size) {} |
duke@435 | 63 | |
duke@435 | 64 | MemRegion intersection(const MemRegion mr2) const; |
duke@435 | 65 | // regions must overlap or be adjacent |
duke@435 | 66 | MemRegion _union(const MemRegion mr2) const; |
duke@435 | 67 | // minus will fail a guarantee if mr2 is interior to this, |
duke@435 | 68 | // since there's no way to return 2 disjoint regions. |
duke@435 | 69 | MemRegion minus(const MemRegion mr2) const; |
duke@435 | 70 | |
duke@435 | 71 | HeapWord* start() const { return _start; } |
duke@435 | 72 | HeapWord* end() const { return _start + _word_size; } |
duke@435 | 73 | HeapWord* last() const { return _start + _word_size - 1; } |
duke@435 | 74 | |
duke@435 | 75 | void set_start(HeapWord* start) { _start = start; } |
duke@435 | 76 | void set_end(HeapWord* end) { _word_size = pointer_delta(end, _start); } |
duke@435 | 77 | void set_word_size(size_t word_size) { |
duke@435 | 78 | _word_size = word_size; |
duke@435 | 79 | } |
duke@435 | 80 | |
duke@435 | 81 | bool contains(const MemRegion mr2) const { |
duke@435 | 82 | return _start <= mr2._start && end() >= mr2.end(); |
duke@435 | 83 | } |
duke@435 | 84 | bool contains(const void* addr) const { |
duke@435 | 85 | return addr >= (void*)_start && addr < (void*)end(); |
duke@435 | 86 | } |
duke@435 | 87 | bool equals(const MemRegion mr2) const { |
duke@435 | 88 | // first disjunct since we do not have a canonical empty set |
duke@435 | 89 | return ((is_empty() && mr2.is_empty()) || |
duke@435 | 90 | (start() == mr2.start() && end() == mr2.end())); |
duke@435 | 91 | } |
duke@435 | 92 | |
duke@435 | 93 | size_t byte_size() const { return _word_size * sizeof(HeapWord); } |
duke@435 | 94 | size_t word_size() const { return _word_size; } |
duke@435 | 95 | |
duke@435 | 96 | bool is_empty() const { return word_size() == 0; } |
minqi@5103 | 97 | void* operator new(size_t size); |
minqi@5103 | 98 | void* operator new [](size_t size); |
minqi@5103 | 99 | void operator delete(void* p); |
minqi@5103 | 100 | void operator delete [](void* p); |
duke@435 | 101 | }; |
duke@435 | 102 | |
duke@435 | 103 | // For iteration over MemRegion's. |
duke@435 | 104 | |
duke@435 | 105 | class MemRegionClosure : public StackObj { |
duke@435 | 106 | public: |
duke@435 | 107 | virtual void do_MemRegion(MemRegion mr) = 0; |
duke@435 | 108 | }; |
duke@435 | 109 | |
duke@435 | 110 | // A ResourceObj version of MemRegionClosure |
duke@435 | 111 | |
duke@435 | 112 | class MemRegionClosureRO: public MemRegionClosure { |
duke@435 | 113 | public: |
zgu@3900 | 114 | void* operator new(size_t size, ResourceObj::allocation_type type, MEMFLAGS flags) { |
zgu@3900 | 115 | return ResourceObj::operator new(size, type, flags); |
duke@435 | 116 | } |
duke@435 | 117 | void* operator new(size_t size, Arena *arena) { |
duke@435 | 118 | return ResourceObj::operator new(size, arena); |
duke@435 | 119 | } |
duke@435 | 120 | void* operator new(size_t size) { |
duke@435 | 121 | return ResourceObj::operator new(size); |
duke@435 | 122 | } |
duke@435 | 123 | |
duke@435 | 124 | void operator delete(void* p) {} // nothing to do |
duke@435 | 125 | }; |
stefank@2314 | 126 | |
stefank@2314 | 127 | #endif // SHARE_VM_MEMORY_MEMREGION_HPP |