Mercurial > hg > graal-compiler
annotate src/share/vm/memory/resourceArea.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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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 | |
25 // The resource area holds temporary data structures in the VM. | |
26 // The actual allocation areas are thread local. Typical usage: | |
27 // | |
28 // ... | |
29 // { | |
30 // ResourceMark rm; | |
31 // int foo[] = NEW_RESOURCE_ARRAY(int, 64); | |
32 // ... | |
33 // } | |
34 // ... | |
35 | |
36 //------------------------------ResourceArea----------------------------------- | |
37 // A ResourceArea is an Arena that supports safe usage of ResourceMark. | |
38 class ResourceArea: public Arena { | |
39 friend class ResourceMark; | |
40 friend class DeoptResourceMark; | |
41 debug_only(int _nesting;) // current # of nested ResourceMarks | |
42 debug_only(static int _warned;) // to suppress multiple warnings | |
43 | |
44 public: | |
45 ResourceArea() { | |
46 debug_only(_nesting = 0;) | |
47 } | |
48 | |
49 ResourceArea(size_t init_size) : Arena(init_size) { | |
50 debug_only(_nesting = 0;); | |
51 } | |
52 | |
53 char* allocate_bytes(size_t size) { | |
54 #ifdef ASSERT | |
55 if (_nesting < 1 && !_warned++) | |
56 fatal("memory leak: allocating without ResourceMark"); | |
57 if (UseMallocOnly) { | |
58 // use malloc, but save pointer in res. area for later freeing | |
59 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
60 return (*save = (char*)os::malloc(size)); | |
61 } | |
62 #endif | |
63 return (char*)Amalloc(size); | |
64 } | |
65 | |
66 debug_only(int nesting() const { return _nesting; }); | |
67 }; | |
68 | |
69 | |
70 //------------------------------ResourceMark----------------------------------- | |
71 // A resource mark releases all resources allocated after it was constructed | |
72 // when the destructor is called. Typically used as a local variable. | |
73 class ResourceMark: public StackObj { | |
74 protected: | |
75 ResourceArea *_area; // Resource area to stack allocate | |
76 Chunk *_chunk; // saved arena chunk | |
77 char *_hwm, *_max; | |
78 NOT_PRODUCT(size_t _size_in_bytes;) | |
79 | |
80 void initialize(Thread *thread) { | |
81 _area = thread->resource_area(); | |
82 _chunk = _area->_chunk; | |
83 _hwm = _area->_hwm; | |
84 _max= _area->_max; | |
85 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
86 debug_only(_area->_nesting++;) | |
87 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
88 } | |
89 | |
90 public: | |
91 | |
92 #ifndef ASSERT | |
93 ResourceMark(Thread *thread) { | |
94 assert(thread == Thread::current(), "not the current thread"); | |
95 initialize(thread); | |
96 } | |
97 #else | |
98 ResourceMark(Thread *thread); | |
99 #endif // ASSERT | |
100 | |
101 ResourceMark() { initialize(Thread::current()); } | |
102 | |
103 ResourceMark( ResourceArea *r ) : | |
104 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
105 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
106 debug_only(_area->_nesting++;) | |
107 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
108 } | |
109 | |
110 void reset_to_mark() { | |
111 if (UseMallocOnly) free_malloced_objects(); | |
112 | |
113 if( _chunk->next() ) // Delete later chunks | |
114 _chunk->next_chop(); | |
115 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
116 _area->_hwm = _hwm; | |
117 _area->_max = _max; | |
118 | |
119 // clear out this chunk (to detect allocation bugs) | |
120 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
121 _area->set_size_in_bytes(size_in_bytes()); | |
122 } | |
123 | |
124 ~ResourceMark() { | |
125 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
126 debug_only(_area->_nesting--;) | |
127 reset_to_mark(); | |
128 } | |
129 | |
130 | |
131 private: | |
132 void free_malloced_objects() PRODUCT_RETURN; | |
133 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
134 }; | |
135 | |
136 //------------------------------DeoptResourceMark----------------------------------- | |
137 // A deopt resource mark releases all resources allocated after it was constructed | |
138 // when the destructor is called. Typically used as a local variable. It differs | |
139 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
140 // can use data structures that are arena based but are not amenable to vanilla | |
141 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
142 // deoptimization we go thru the following steps: | |
143 // | |
144 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
145 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
146 // This allocates the DeoptResourceMark. | |
147 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
148 // the new skeletal frames. | |
149 // 3: push new stub frame and call unpack_frames | |
150 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
151 // 5: release the DeoptResourceMark | |
152 // 6: return to stub and eventually to interpreter | |
153 // | |
154 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
155 // was no way for the vframeArray to contain resource allocated objects and so | |
156 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
157 // was used. With new style lazy deoptimization the vframeArray is created in the | |
158 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
159 // leveraging existing data structures if we simply create a way to manage this one | |
160 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
161 // then existing ResourceMarks would work fine since no one use new to allocate them | |
162 // and they would be stack allocated. This leaves open the possibilty of accidental | |
163 // misuse so we simple duplicate the ResourceMark functionality here. | |
164 | |
165 class DeoptResourceMark: public CHeapObj { | |
166 protected: | |
167 ResourceArea *_area; // Resource area to stack allocate | |
168 Chunk *_chunk; // saved arena chunk | |
169 char *_hwm, *_max; | |
170 NOT_PRODUCT(size_t _size_in_bytes;) | |
171 | |
172 void initialize(Thread *thread) { | |
173 _area = thread->resource_area(); | |
174 _chunk = _area->_chunk; | |
175 _hwm = _area->_hwm; | |
176 _max= _area->_max; | |
177 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
178 debug_only(_area->_nesting++;) | |
179 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
180 } | |
181 | |
182 public: | |
183 | |
184 #ifndef ASSERT | |
185 DeoptResourceMark(Thread *thread) { | |
186 assert(thread == Thread::current(), "not the current thread"); | |
187 initialize(thread); | |
188 } | |
189 #else | |
190 DeoptResourceMark(Thread *thread); | |
191 #endif // ASSERT | |
192 | |
193 DeoptResourceMark() { initialize(Thread::current()); } | |
194 | |
195 DeoptResourceMark( ResourceArea *r ) : | |
196 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
197 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
198 debug_only(_area->_nesting++;) | |
199 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
200 } | |
201 | |
202 void reset_to_mark() { | |
203 if (UseMallocOnly) free_malloced_objects(); | |
204 | |
205 if( _chunk->next() ) // Delete later chunks | |
206 _chunk->next_chop(); | |
207 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
208 _area->_hwm = _hwm; | |
209 _area->_max = _max; | |
210 | |
211 // clear out this chunk (to detect allocation bugs) | |
212 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
213 _area->set_size_in_bytes(size_in_bytes()); | |
214 } | |
215 | |
216 ~DeoptResourceMark() { | |
217 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
218 debug_only(_area->_nesting--;) | |
219 reset_to_mark(); | |
220 } | |
221 | |
222 | |
223 private: | |
224 void free_malloced_objects() PRODUCT_RETURN; | |
225 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
226 }; |