Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/collectionSetChooser.hpp @ 2152:0fa27f37d4d4
6977804: G1: remove the zero-filling thread
Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification.
Reviewed-by: jcoomes, johnc
author | tonyp |
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date | Wed, 19 Jan 2011 19:30:42 -0500 |
parents | f95d63e2154a |
children | 371bbc844bf1 |
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 | |
549
fe3d7c11b4b7
6700941: G1: allocation spec missing for some G1 classes
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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 printSortedHeapRegions(); | |
104 | |
105 void sortMarkedHeapRegions(); | |
106 void fillCache(); | |
107 bool addRegionToCache(void); | |
108 void addMarkedHeapRegion(HeapRegion *hr); | |
109 | |
110 // Must be called before calls to getParMarkedHeapRegionChunk. | |
111 // "n_regions" is the number of regions, "chunkSize" the chunk size. | |
112 void prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize); | |
113 // Returns the first index in a contiguous chunk of "n_regions" indexes | |
114 // that the calling thread has reserved. These must be set by the | |
115 // calling thread using "setMarkedHeapRegion" (to NULL if necessary). | |
116 jint getParMarkedHeapRegionChunk(jint n_regions); | |
117 // Set the marked array entry at index to hr. Careful to claim the index | |
118 // first if in parallel. | |
119 void setMarkedHeapRegion(jint index, HeapRegion* hr); | |
120 // Atomically increment the number of claimed regions by "inc_by". | |
121 void incNumMarkedHeapRegions(jint inc_by); | |
122 | |
123 void clearMarkedHeapRegions(); | |
124 | |
125 void updateAfterFullCollection(); | |
126 | |
127 // Ensure that "hr" is not a member of the marked region array or the cache | |
128 void removeRegion(HeapRegion* hr); | |
129 | |
130 bool unmarked_age_1_returned_as_new() { return _unmarked_age_1_returned_as_new; } | |
131 | |
132 // Returns true if the used portion of "_markedRegions" is properly | |
133 // sorted, otherwise asserts false. | |
134 #ifndef PRODUCT | |
135 bool verify(void); | |
136 bool regionProperlyOrdered(HeapRegion* r) { | |
137 int si = r->sort_index(); | |
138 return (si == -1) || | |
139 (si > -1 && _markedRegions.at(si) == r) || | |
140 (si < -1 && _cache.region_in_cache(r)); | |
141 } | |
142 #endif | |
143 | |
144 }; | |
1972 | 145 |
146 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP |