Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
author | mgerdin |
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date | Thu, 09 Oct 2014 15:42:23 +0200 |
parents | 889068b9a088 |
children | 63a4eb8bcd23 02e61cf08ab3 |
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_BUFFERINGOOPCLOSURE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP | |
27 | |
28 #include "memory/genOopClosures.hpp" | |
29 #include "memory/generation.hpp" | |
30 #include "runtime/os.hpp" | |
31 #include "utilities/taskqueue.hpp" | |
32 | |
342 | 33 // A BufferingOops closure tries to separate out the cost of finding roots |
34 // from the cost of applying closures to them. It maintains an array of | |
35 // ref-containing locations. Until the array is full, applying the closure | |
36 // to an oop* merely records that location in the array. Since this | |
37 // closure app cost is small, an elapsed timer can approximately attribute | |
38 // all of this cost to the cost of finding the roots. When the array fills | |
39 // up, the wrapped closure is applied to all elements, keeping track of | |
40 // this elapsed time of this process, and leaving the array empty. | |
41 // The caller must be sure to call "done" to process any unprocessed | |
42 // buffered entriess. | |
43 | |
44 class Generation; | |
45 class HeapRegion; | |
46 | |
47 class BufferingOopClosure: public OopClosure { | |
48 protected: | |
49 enum PrivateConstants { | |
50 BufferLength = 1024 | |
51 }; | |
52 | |
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53 StarTask _buffer[BufferLength]; |
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54 StarTask* _buffer_top; |
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55 StarTask* _buffer_curr; |
342 | 56 |
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57 OopClosure* _oc; |
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58 double _closure_app_seconds; |
342 | 59 |
60 void process_buffer () { | |
61 double start = os::elapsedTime(); | |
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62 for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) { |
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63 if (curr->is_narrow()) { |
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64 assert(UseCompressedOops, "Error"); |
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65 _oc->do_oop((narrowOop*)(*curr)); |
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66 } else { |
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67 _oc->do_oop((oop*)(*curr)); |
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68 } |
342 | 69 } |
70 _buffer_curr = _buffer; | |
71 _closure_app_seconds += (os::elapsedTime() - start); | |
72 } | |
73 | |
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74 template <class T> inline void do_oop_work(T* p) { |
342 | 75 if (_buffer_curr == _buffer_top) { |
76 process_buffer(); | |
77 } | |
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78 StarTask new_ref(p); |
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79 *_buffer_curr = new_ref; |
342 | 80 ++_buffer_curr; |
81 } | |
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82 |
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83 public: |
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84 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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85 virtual void do_oop(oop* p) { do_oop_work(p); } |
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86 |
342 | 87 void done () { |
88 if (_buffer_curr > _buffer) { | |
89 process_buffer(); | |
90 } | |
91 } | |
92 double closure_app_seconds () { | |
93 return _closure_app_seconds; | |
94 } | |
95 BufferingOopClosure (OopClosure *oc) : | |
96 _oc(oc), | |
97 _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength), | |
98 _closure_app_seconds(0.0) { } | |
99 }; | |
100 | |
1972 | 101 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP |