Mercurial > hg > graal-compiler
annotate src/share/vm/memory/metachunk.hpp @ 10175:c23dbf0e8ab7
8011268: NPG: Free unused VirtualSpaceNodes
Reviewed-by: mgerdin, coleenp, johnc
| author | jmasa |
|---|---|
| date | Fri, 01 Mar 2013 10:19:29 -0800 |
| parents | e51c9860cf66 |
| children | bdfbb1fb19ca |
| rev | line source |
|---|---|
| 6885 | 1 /* |
| 2 * Copyright (c) 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 */ | |
| 24 #ifndef SHARE_VM_MEMORY_METACHUNK_HPP | |
| 25 #define SHARE_VM_MEMORY_METACHUNK_HPP | |
| 26 | |
| 27 // Metachunk - Quantum of allocation from a Virtualspace | |
| 28 // Metachunks are reused (when freed are put on a global freelist) and | |
| 29 // have no permanent association to a SpaceManager. | |
| 30 | |
| 31 // +--------------+ <- end | |
| 32 // | | --+ ---+ | |
| 33 // | | | free | | |
| 34 // | | | | | |
| 35 // | | | | capacity | |
| 36 // | | | | | |
| 37 // | | <- top --+ | | |
| 38 // | | ---+ | | |
| 39 // | | | used | | |
| 40 // | | | | | |
| 41 // | | | | | |
| 42 // +--------------+ <- bottom ---+ ---+ | |
| 43 | |
| 10175 | 44 class VirtualSpaceNode; |
| 45 | |
| 6885 | 46 class Metachunk VALUE_OBJ_CLASS_SPEC { |
| 47 // link to support lists of chunks | |
| 48 Metachunk* _next; | |
| 49 Metachunk* _prev; | |
| 10175 | 50 VirtualSpaceNode* _container; |
| 6885 | 51 |
| 52 MetaWord* _bottom; | |
| 53 MetaWord* _end; | |
| 54 MetaWord* _top; | |
| 55 size_t _word_size; | |
| 56 // Used in a guarantee() so included in the Product builds | |
| 57 // even through it is only for debugging. | |
| 58 bool _is_free; | |
| 59 | |
| 60 // Metachunks are allocated out of a MetadataVirtualSpace and | |
| 61 // and use some of its space to describe itself (plus alignment | |
| 62 // considerations). Metadata is allocated in the rest of the chunk. | |
| 63 // This size is the overhead of maintaining the Metachunk within | |
| 64 // the space. | |
| 65 static size_t _overhead; | |
| 66 | |
| 67 public: | |
| 10175 | 68 Metachunk(size_t word_size , VirtualSpaceNode* container); |
| 6885 | 69 |
| 70 // Used to add a Metachunk to a list of Metachunks | |
| 71 void set_next(Metachunk* v) { _next = v; assert(v != this, "Boom");} | |
| 72 void set_prev(Metachunk* v) { _prev = v; assert(v != this, "Boom");} | |
| 10175 | 73 void set_container(VirtualSpaceNode* v) { _container = v; } |
| 6885 | 74 |
| 75 MetaWord* allocate(size_t word_size); | |
| 76 | |
| 77 // Accessors | |
| 78 Metachunk* next() const { return _next; } | |
| 79 Metachunk* prev() const { return _prev; } | |
| 10175 | 80 VirtualSpaceNode* container() const { return _container; } |
| 6885 | 81 MetaWord* bottom() const { return _bottom; } |
| 82 MetaWord* end() const { return _end; } | |
| 83 MetaWord* top() const { return _top; } | |
| 84 size_t word_size() const { return _word_size; } | |
| 85 size_t size() const volatile { return _word_size; } | |
| 86 void set_size(size_t v) { _word_size = v; } | |
| 87 bool is_free() { return _is_free; } | |
| 88 void set_is_free(bool v) { _is_free = v; } | |
| 89 static size_t overhead() { return _overhead; } | |
| 90 void clear_next() { set_next(NULL); } | |
| 91 void link_prev(Metachunk* ptr) { set_prev(ptr); } | |
| 92 uintptr_t* end() { return ((uintptr_t*) this) + size(); } | |
| 93 bool cantCoalesce() const { return false; } | |
| 94 void link_next(Metachunk* ptr) { set_next(ptr); } | |
| 95 void link_after(Metachunk* ptr){ | |
| 96 link_next(ptr); | |
| 97 if (ptr != NULL) ptr->link_prev(this); | |
| 98 } | |
| 99 | |
| 100 // Reset top to bottom so chunk can be reused. | |
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7446
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7185
diff
changeset
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101 void reset_empty() { _top = (_bottom + _overhead); _next = NULL; _prev = NULL; } |
| 6885 | 102 bool is_empty() { return _top == (_bottom + _overhead); } |
| 103 | |
| 104 // used (has been allocated) | |
| 105 // free (available for future allocations) | |
| 106 // capacity (total size of chunk) | |
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7446
e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7185
diff
changeset
|
107 size_t used_word_size() const; |
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e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7185
diff
changeset
|
108 size_t free_word_size() const; |
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e51c9860cf66
8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
jmasa
parents:
7185
diff
changeset
|
109 size_t capacity_word_size()const; |
| 6885 | 110 |
| 111 // Debug support | |
| 112 #ifdef ASSERT | |
| 113 void* prev_addr() const { return (void*)&_prev; } | |
| 114 void* next_addr() const { return (void*)&_next; } | |
| 115 void* size_addr() const { return (void*)&_word_size; } | |
| 116 #endif | |
| 117 bool verify_chunk_in_free_list(Metachunk* tc) const { return true; } | |
| 118 bool verify_par_locked() { return true; } | |
| 119 | |
| 120 void assert_is_mangled() const {/* Don't check "\*/} | |
| 121 | |
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7185
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
parents:
6885
diff
changeset
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122 NOT_PRODUCT(void mangle();) |
| 6885 | 123 |
| 124 void print_on(outputStream* st) const; | |
| 125 void verify(); | |
| 126 }; | |
| 127 #endif // SHARE_VM_MEMORY_METACHUNK_HPP |