Mercurial > hg > truffle
annotate src/share/vm/memory/resourceArea.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
| author | ysr |
|---|---|
| date | Wed, 16 Mar 2011 10:37:08 -0700 |
| parents | f95d63e2154a |
| children | f6f3bb0ee072 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_MEMORY_RESOURCEAREA_HPP |
| 26 #define SHARE_VM_MEMORY_RESOURCEAREA_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #ifdef TARGET_OS_FAMILY_linux | |
| 30 # include "thread_linux.inline.hpp" | |
| 31 #endif | |
| 32 #ifdef TARGET_OS_FAMILY_solaris | |
| 33 # include "thread_solaris.inline.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_OS_FAMILY_windows | |
| 36 # include "thread_windows.inline.hpp" | |
| 37 #endif | |
| 38 | |
| 0 | 39 // The resource area holds temporary data structures in the VM. |
| 40 // The actual allocation areas are thread local. Typical usage: | |
| 41 // | |
| 42 // ... | |
| 43 // { | |
| 44 // ResourceMark rm; | |
| 45 // int foo[] = NEW_RESOURCE_ARRAY(int, 64); | |
| 46 // ... | |
| 47 // } | |
| 48 // ... | |
| 49 | |
| 50 //------------------------------ResourceArea----------------------------------- | |
| 51 // A ResourceArea is an Arena that supports safe usage of ResourceMark. | |
| 52 class ResourceArea: public Arena { | |
| 53 friend class ResourceMark; | |
| 54 friend class DeoptResourceMark; | |
| 55 debug_only(int _nesting;) // current # of nested ResourceMarks | |
| 56 debug_only(static int _warned;) // to suppress multiple warnings | |
| 57 | |
| 58 public: | |
| 59 ResourceArea() { | |
| 60 debug_only(_nesting = 0;) | |
| 61 } | |
| 62 | |
| 63 ResourceArea(size_t init_size) : Arena(init_size) { | |
| 64 debug_only(_nesting = 0;); | |
| 65 } | |
| 66 | |
| 67 char* allocate_bytes(size_t size) { | |
| 68 #ifdef ASSERT | |
| 69 if (_nesting < 1 && !_warned++) | |
| 70 fatal("memory leak: allocating without ResourceMark"); | |
| 71 if (UseMallocOnly) { | |
| 72 // use malloc, but save pointer in res. area for later freeing | |
| 73 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
| 74 return (*save = (char*)os::malloc(size)); | |
| 75 } | |
| 76 #endif | |
| 77 return (char*)Amalloc(size); | |
| 78 } | |
| 79 | |
| 80 debug_only(int nesting() const { return _nesting; }); | |
| 81 }; | |
| 82 | |
| 83 | |
| 84 //------------------------------ResourceMark----------------------------------- | |
| 85 // A resource mark releases all resources allocated after it was constructed | |
| 86 // when the destructor is called. Typically used as a local variable. | |
| 87 class ResourceMark: public StackObj { | |
| 88 protected: | |
| 89 ResourceArea *_area; // Resource area to stack allocate | |
| 90 Chunk *_chunk; // saved arena chunk | |
| 91 char *_hwm, *_max; | |
| 92 NOT_PRODUCT(size_t _size_in_bytes;) | |
| 93 | |
| 94 void initialize(Thread *thread) { | |
| 95 _area = thread->resource_area(); | |
| 96 _chunk = _area->_chunk; | |
| 97 _hwm = _area->_hwm; | |
| 98 _max= _area->_max; | |
| 99 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 100 debug_only(_area->_nesting++;) | |
| 101 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 102 } | |
| 103 | |
| 104 public: | |
| 105 | |
| 106 #ifndef ASSERT | |
| 107 ResourceMark(Thread *thread) { | |
| 108 assert(thread == Thread::current(), "not the current thread"); | |
| 109 initialize(thread); | |
| 110 } | |
| 111 #else | |
| 112 ResourceMark(Thread *thread); | |
| 113 #endif // ASSERT | |
| 114 | |
| 115 ResourceMark() { initialize(Thread::current()); } | |
| 116 | |
| 117 ResourceMark( ResourceArea *r ) : | |
| 118 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 119 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 120 debug_only(_area->_nesting++;) | |
| 121 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 122 } | |
| 123 | |
| 124 void reset_to_mark() { | |
| 125 if (UseMallocOnly) free_malloced_objects(); | |
| 126 | |
| 127 if( _chunk->next() ) // Delete later chunks | |
| 128 _chunk->next_chop(); | |
| 129 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
| 130 _area->_hwm = _hwm; | |
| 131 _area->_max = _max; | |
| 132 | |
| 133 // clear out this chunk (to detect allocation bugs) | |
| 134 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 135 _area->set_size_in_bytes(size_in_bytes()); | |
| 136 } | |
| 137 | |
| 138 ~ResourceMark() { | |
| 139 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 140 debug_only(_area->_nesting--;) | |
| 141 reset_to_mark(); | |
| 142 } | |
| 143 | |
| 144 | |
| 145 private: | |
| 146 void free_malloced_objects() PRODUCT_RETURN; | |
| 147 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
| 148 }; | |
| 149 | |
| 150 //------------------------------DeoptResourceMark----------------------------------- | |
| 151 // A deopt resource mark releases all resources allocated after it was constructed | |
| 152 // when the destructor is called. Typically used as a local variable. It differs | |
| 153 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
| 154 // can use data structures that are arena based but are not amenable to vanilla | |
| 155 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
| 156 // deoptimization we go thru the following steps: | |
| 157 // | |
| 158 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
| 159 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
| 160 // This allocates the DeoptResourceMark. | |
| 161 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
| 162 // the new skeletal frames. | |
| 163 // 3: push new stub frame and call unpack_frames | |
| 164 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
| 165 // 5: release the DeoptResourceMark | |
| 166 // 6: return to stub and eventually to interpreter | |
| 167 // | |
| 168 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
| 169 // was no way for the vframeArray to contain resource allocated objects and so | |
| 170 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
| 171 // was used. With new style lazy deoptimization the vframeArray is created in the | |
| 172 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
| 173 // leveraging existing data structures if we simply create a way to manage this one | |
| 174 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
| 175 // then existing ResourceMarks would work fine since no one use new to allocate them | |
| 176 // and they would be stack allocated. This leaves open the possibilty of accidental | |
| 177 // misuse so we simple duplicate the ResourceMark functionality here. | |
| 178 | |
| 179 class DeoptResourceMark: public CHeapObj { | |
| 180 protected: | |
| 181 ResourceArea *_area; // Resource area to stack allocate | |
| 182 Chunk *_chunk; // saved arena chunk | |
| 183 char *_hwm, *_max; | |
| 184 NOT_PRODUCT(size_t _size_in_bytes;) | |
| 185 | |
| 186 void initialize(Thread *thread) { | |
| 187 _area = thread->resource_area(); | |
| 188 _chunk = _area->_chunk; | |
| 189 _hwm = _area->_hwm; | |
| 190 _max= _area->_max; | |
| 191 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 192 debug_only(_area->_nesting++;) | |
| 193 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 194 } | |
| 195 | |
| 196 public: | |
| 197 | |
| 198 #ifndef ASSERT | |
| 199 DeoptResourceMark(Thread *thread) { | |
| 200 assert(thread == Thread::current(), "not the current thread"); | |
| 201 initialize(thread); | |
| 202 } | |
| 203 #else | |
| 204 DeoptResourceMark(Thread *thread); | |
| 205 #endif // ASSERT | |
| 206 | |
| 207 DeoptResourceMark() { initialize(Thread::current()); } | |
| 208 | |
| 209 DeoptResourceMark( ResourceArea *r ) : | |
| 210 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 211 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 212 debug_only(_area->_nesting++;) | |
| 213 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 214 } | |
| 215 | |
| 216 void reset_to_mark() { | |
| 217 if (UseMallocOnly) free_malloced_objects(); | |
| 218 | |
| 219 if( _chunk->next() ) // Delete later chunks | |
| 220 _chunk->next_chop(); | |
| 221 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
| 222 _area->_hwm = _hwm; | |
| 223 _area->_max = _max; | |
| 224 | |
| 225 // clear out this chunk (to detect allocation bugs) | |
| 226 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 227 _area->set_size_in_bytes(size_in_bytes()); | |
| 228 } | |
| 229 | |
| 230 ~DeoptResourceMark() { | |
| 231 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 232 debug_only(_area->_nesting--;) | |
| 233 reset_to_mark(); | |
| 234 } | |
| 235 | |
| 236 | |
| 237 private: | |
| 238 void free_malloced_objects() PRODUCT_RETURN; | |
| 239 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
| 240 }; | |
| 1972 | 241 |
| 242 #endif // SHARE_VM_MEMORY_RESOURCEAREA_HPP |