Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parNew/parGCAllocBuffer.hpp @ 1829:fe08403130db
6979458: VM crashes when -XX:ObjectAlignmentInBytes is too big
Summary: Set upper limit 256 for ObjectAlignmentInBytes value.
Reviewed-by: never, iveresov
author | kvn |
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date | Tue, 05 Oct 2010 08:57:20 -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 // Forward decl. | |
26 | |
27 class PLABStats; | |
28 | |
29 // A per-thread allocation buffer used during GC. | |
30 class ParGCAllocBuffer: public CHeapObj { | |
31 protected: | |
32 char head[32]; | |
33 size_t _word_sz; // in HeapWord units | |
34 HeapWord* _bottom; | |
35 HeapWord* _top; | |
36 HeapWord* _end; // last allocatable address + 1 | |
37 HeapWord* _hard_end; // _end + AlignmentReserve | |
38 bool _retained; // whether we hold a _retained_filler | |
39 MemRegion _retained_filler; | |
40 // In support of ergonomic sizing of PLAB's | |
41 size_t _allocated; // in HeapWord units | |
42 size_t _wasted; // in HeapWord units | |
43 char tail[32]; | |
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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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44 static size_t FillerHeaderSize; |
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45 static size_t AlignmentReserve; |
0 | 46 |
47 public: | |
48 // Initializes the buffer to be empty, but with the given "word_sz". | |
49 // Must get initialized with "set_buf" for an allocation to succeed. | |
50 ParGCAllocBuffer(size_t word_sz); | |
51 | |
52 static const size_t min_size() { | |
53 return ThreadLocalAllocBuffer::min_size(); | |
54 } | |
55 | |
56 static const size_t max_size() { | |
57 return ThreadLocalAllocBuffer::max_size(); | |
58 } | |
59 | |
60 // If an allocation of the given "word_sz" can be satisfied within the | |
61 // buffer, do the allocation, returning a pointer to the start of the | |
62 // allocated block. If the allocation request cannot be satisfied, | |
63 // return NULL. | |
64 HeapWord* allocate(size_t word_sz) { | |
65 HeapWord* res = _top; | |
634 | 66 if (pointer_delta(_end, _top) >= word_sz) { |
67 _top = _top + word_sz; | |
0 | 68 return res; |
69 } else { | |
70 return NULL; | |
71 } | |
72 } | |
73 | |
74 // Undo the last allocation in the buffer, which is required to be of the | |
75 // "obj" of the given "word_sz". | |
76 void undo_allocation(HeapWord* obj, size_t word_sz) { | |
634 | 77 assert(pointer_delta(_top, _bottom) >= word_sz, "Bad undo"); |
78 assert(pointer_delta(_top, obj) == word_sz, "Bad undo"); | |
79 _top = obj; | |
0 | 80 } |
81 | |
82 // The total (word) size of the buffer, including both allocated and | |
83 // unallocted space. | |
84 size_t word_sz() { return _word_sz; } | |
85 | |
86 // Should only be done if we are about to reset with a new buffer of the | |
87 // given size. | |
88 void set_word_size(size_t new_word_sz) { | |
89 assert(new_word_sz > AlignmentReserve, "Too small"); | |
90 _word_sz = new_word_sz; | |
91 } | |
92 | |
93 // The number of words of unallocated space remaining in the buffer. | |
94 size_t words_remaining() { | |
95 assert(_end >= _top, "Negative buffer"); | |
96 return pointer_delta(_end, _top, HeapWordSize); | |
97 } | |
98 | |
99 bool contains(void* addr) { | |
100 return (void*)_bottom <= addr && addr < (void*)_hard_end; | |
101 } | |
102 | |
103 // Sets the space of the buffer to be [buf, space+word_sz()). | |
104 void set_buf(HeapWord* buf) { | |
105 _bottom = buf; | |
106 _top = _bottom; | |
107 _hard_end = _bottom + word_sz(); | |
108 _end = _hard_end - AlignmentReserve; | |
109 assert(_end >= _top, "Negative buffer"); | |
110 // In support of ergonomic sizing | |
111 _allocated += word_sz(); | |
112 } | |
113 | |
114 // Flush the stats supporting ergonomic sizing of PLAB's | |
115 void flush_stats(PLABStats* stats); | |
116 void flush_stats_and_retire(PLABStats* stats, bool retain) { | |
117 // We flush the stats first in order to get a reading of | |
118 // unused space in the last buffer. | |
119 if (ResizePLAB) { | |
120 flush_stats(stats); | |
121 } | |
122 // Retire the last allocation buffer. | |
123 retire(true, retain); | |
124 } | |
125 | |
126 // Force future allocations to fail and queries for contains() | |
127 // to return false | |
128 void invalidate() { | |
129 assert(!_retained, "Shouldn't retain an invalidated buffer."); | |
130 _end = _hard_end; | |
131 _wasted += pointer_delta(_end, _top); // unused space | |
132 _top = _end; // force future allocations to fail | |
133 _bottom = _end; // force future contains() queries to return false | |
134 } | |
135 | |
136 // Fills in the unallocated portion of the buffer with a garbage object. | |
137 // If "end_of_gc" is TRUE, is after the last use in the GC. IF "retain" | |
138 // is true, attempt to re-use the unused portion in the next GC. | |
139 void retire(bool end_of_gc, bool retain); | |
140 | |
141 void print() PRODUCT_RETURN; | |
142 }; | |
143 | |
144 // PLAB stats book-keeping | |
145 class PLABStats VALUE_OBJ_CLASS_SPEC { | |
146 size_t _allocated; // total allocated | |
147 size_t _wasted; // of which wasted (internal fragmentation) | |
148 size_t _unused; // Unused in last buffer | |
149 size_t _used; // derived = allocated - wasted - unused | |
150 size_t _desired_plab_sz;// output of filter (below), suitably trimmed and quantized | |
151 AdaptiveWeightedAverage | |
152 _filter; // integrator with decay | |
153 | |
154 public: | |
155 PLABStats(size_t desired_plab_sz_, unsigned wt) : | |
156 _allocated(0), | |
157 _wasted(0), | |
158 _unused(0), | |
159 _used(0), | |
160 _desired_plab_sz(desired_plab_sz_), | |
161 _filter(wt) | |
162 { | |
163 size_t min_sz = min_size(); | |
164 size_t max_sz = max_size(); | |
165 size_t aligned_min_sz = align_object_size(min_sz); | |
166 size_t aligned_max_sz = align_object_size(max_sz); | |
167 assert(min_sz <= aligned_min_sz && max_sz >= aligned_max_sz && | |
168 min_sz <= max_sz, | |
169 "PLAB clipping computation in adjust_desired_plab_sz()" | |
170 " may be incorrect"); | |
171 } | |
172 | |
173 static const size_t min_size() { | |
174 return ParGCAllocBuffer::min_size(); | |
175 } | |
176 | |
177 static const size_t max_size() { | |
178 return ParGCAllocBuffer::max_size(); | |
179 } | |
180 | |
181 size_t desired_plab_sz() { | |
182 return _desired_plab_sz; | |
183 } | |
184 | |
185 void adjust_desired_plab_sz(); // filter computation, latches output to | |
186 // _desired_plab_sz, clears sensor accumulators | |
187 | |
188 void add_allocated(size_t v) { | |
189 Atomic::add_ptr(v, &_allocated); | |
190 } | |
191 | |
192 void add_unused(size_t v) { | |
193 Atomic::add_ptr(v, &_unused); | |
194 } | |
195 | |
196 void add_wasted(size_t v) { | |
197 Atomic::add_ptr(v, &_wasted); | |
198 } | |
199 }; | |
200 | |
201 class ParGCAllocBufferWithBOT: public ParGCAllocBuffer { | |
202 BlockOffsetArrayContigSpace _bt; | |
203 BlockOffsetSharedArray* _bsa; | |
204 HeapWord* _true_end; // end of the whole ParGCAllocBuffer | |
205 | |
206 static const size_t ChunkSizeInWords; | |
207 static const size_t ChunkSizeInBytes; | |
208 HeapWord* allocate_slow(size_t word_sz); | |
209 | |
210 void fill_region_with_block(MemRegion mr, bool contig); | |
211 | |
212 public: | |
213 ParGCAllocBufferWithBOT(size_t word_sz, BlockOffsetSharedArray* bsa); | |
214 | |
215 HeapWord* allocate(size_t word_sz) { | |
216 HeapWord* res = ParGCAllocBuffer::allocate(word_sz); | |
217 if (res != NULL) { | |
218 _bt.alloc_block(res, word_sz); | |
219 } else { | |
220 res = allocate_slow(word_sz); | |
221 } | |
222 return res; | |
223 } | |
224 | |
225 void undo_allocation(HeapWord* obj, size_t word_sz); | |
226 | |
227 void set_buf(HeapWord* buf_start) { | |
228 ParGCAllocBuffer::set_buf(buf_start); | |
229 _true_end = _hard_end; | |
230 _bt.set_region(MemRegion(buf_start, word_sz())); | |
231 _bt.initialize_threshold(); | |
232 } | |
233 | |
234 void retire(bool end_of_gc, bool retain); | |
235 | |
236 MemRegion range() { | |
237 return MemRegion(_top, _true_end); | |
238 } | |
239 }; |