Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/collectionSetChooser.hpp @ 3759:cfcf2ba8f3eb
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author | never |
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date | Wed, 15 Jun 2011 10:20:03 -0700 |
parents | 371bbc844bf1 |
children | b9390528617c |
rev | line source |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP | |
27 | |
28 #include "gc_implementation/g1/heapRegion.hpp" | |
29 #include "utilities/growableArray.hpp" | |
30 | |
342 | 31 // We need to sort heap regions by collection desirability. |
32 | |
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33 class CSetChooserCache VALUE_OBJ_CLASS_SPEC { |
342 | 34 private: |
35 enum { | |
36 CacheLength = 16 | |
37 } PrivateConstants; | |
38 | |
39 HeapRegion* _cache[CacheLength]; | |
40 int _occupancy; // number of region in cache | |
41 int _first; // "first" region in the cache | |
42 | |
43 // adding CacheLength to deal with negative values | |
44 inline int trim_index(int index) { | |
45 return (index + CacheLength) % CacheLength; | |
46 } | |
47 | |
48 inline int get_sort_index(int index) { | |
49 return -index-2; | |
50 } | |
51 inline int get_index(int sort_index) { | |
52 return -sort_index-2; | |
53 } | |
54 | |
55 public: | |
56 CSetChooserCache(void); | |
57 | |
58 inline int occupancy(void) { return _occupancy; } | |
59 inline bool is_full() { return _occupancy == CacheLength; } | |
60 inline bool is_empty() { return _occupancy == 0; } | |
61 | |
62 void clear(void); | |
63 void insert(HeapRegion *hr); | |
64 HeapRegion *remove_first(void); | |
65 void remove (HeapRegion *hr); | |
66 inline HeapRegion *get_first(void) { | |
67 return _cache[_first]; | |
68 } | |
69 | |
70 #ifndef PRODUCT | |
71 bool verify (void); | |
72 bool region_in_cache(HeapRegion *hr) { | |
73 int sort_index = hr->sort_index(); | |
74 if (sort_index < -1) { | |
75 int index = get_index(sort_index); | |
76 guarantee(index < CacheLength, "should be within bounds"); | |
77 return _cache[index] == hr; | |
78 } else | |
79 return 0; | |
80 } | |
81 #endif // PRODUCT | |
82 }; | |
83 | |
84 class CollectionSetChooser: public CHeapObj { | |
85 | |
86 GrowableArray<HeapRegion*> _markedRegions; | |
87 int _curMarkedIndex; | |
88 int _numMarkedRegions; | |
89 CSetChooserCache _cache; | |
90 | |
91 // True iff last collection pause ran of out new "age 0" regions, and | |
92 // returned an "age 1" region. | |
93 bool _unmarked_age_1_returned_as_new; | |
94 | |
95 jint _first_par_unreserved_idx; | |
96 | |
97 public: | |
98 | |
99 HeapRegion* getNextMarkedRegion(double time_so_far, double avg_prediction); | |
100 | |
101 CollectionSetChooser(); | |
102 | |
103 void sortMarkedHeapRegions(); | |
104 void fillCache(); | |
105 bool addRegionToCache(void); | |
106 void addMarkedHeapRegion(HeapRegion *hr); | |
107 | |
108 // Must be called before calls to getParMarkedHeapRegionChunk. | |
109 // "n_regions" is the number of regions, "chunkSize" the chunk size. | |
110 void prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize); | |
111 // Returns the first index in a contiguous chunk of "n_regions" indexes | |
112 // that the calling thread has reserved. These must be set by the | |
113 // calling thread using "setMarkedHeapRegion" (to NULL if necessary). | |
114 jint getParMarkedHeapRegionChunk(jint n_regions); | |
115 // Set the marked array entry at index to hr. Careful to claim the index | |
116 // first if in parallel. | |
117 void setMarkedHeapRegion(jint index, HeapRegion* hr); | |
118 // Atomically increment the number of claimed regions by "inc_by". | |
119 void incNumMarkedHeapRegions(jint inc_by); | |
120 | |
121 void clearMarkedHeapRegions(); | |
122 | |
123 void updateAfterFullCollection(); | |
124 | |
125 // Ensure that "hr" is not a member of the marked region array or the cache | |
126 void removeRegion(HeapRegion* hr); | |
127 | |
128 bool unmarked_age_1_returned_as_new() { return _unmarked_age_1_returned_as_new; } | |
129 | |
130 // Returns true if the used portion of "_markedRegions" is properly | |
131 // sorted, otherwise asserts false. | |
132 #ifndef PRODUCT | |
133 bool verify(void); | |
134 bool regionProperlyOrdered(HeapRegion* r) { | |
135 int si = r->sort_index(); | |
136 return (si == -1) || | |
137 (si > -1 && _markedRegions.at(si) == r) || | |
138 (si < -1 && _cache.region_in_cache(r)); | |
139 } | |
140 #endif | |
141 | |
142 }; | |
1972 | 143 |
144 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP |