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annotate src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp @ 17727:cfd4aac53239

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8030177: G1: Enable TLAB resizing Reviewed-by: tschatzl, stefank, jmasa
author brutisso
date Mon, 27 Jan 2014 13:14:53 +0100
parents 889068b9a088
children 63a4eb8bcd23 02e61cf08ab3
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1 /*
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP
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27
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28 #include "memory/genOopClosures.hpp"
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29 #include "memory/generation.hpp"
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30 #include "runtime/os.hpp"
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31 #include "utilities/taskqueue.hpp"
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32
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33 // A BufferingOops closure tries to separate out the cost of finding roots
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34 // from the cost of applying closures to them. It maintains an array of
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35 // ref-containing locations. Until the array is full, applying the closure
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36 // to an oop* merely records that location in the array. Since this
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37 // closure app cost is small, an elapsed timer can approximately attribute
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38 // all of this cost to the cost of finding the roots. When the array fills
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39 // up, the wrapped closure is applied to all elements, keeping track of
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40 // this elapsed time of this process, and leaving the array empty.
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41 // The caller must be sure to call "done" to process any unprocessed
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42 // buffered entriess.
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43
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44 class Generation;
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45 class HeapRegion;
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46
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47 class BufferingOopClosure: public OopClosure {
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48 protected:
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49 enum PrivateConstants {
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50 BufferLength = 1024
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51 };
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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;
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56
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57 OopClosure* _oc;
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58 double _closure_app_seconds;
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59
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60 void process_buffer () {
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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 }
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69 }
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70 _buffer_curr = _buffer;
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71 _closure_app_seconds += (os::elapsedTime() - start);
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72 }
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73
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74 template <class T> inline void do_oop_work(T* p) {
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75 if (_buffer_curr == _buffer_top) {
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76 process_buffer();
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77 }
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78 StarTask new_ref(p);
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79 *_buffer_curr = new_ref;
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80 ++_buffer_curr;
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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
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87 void done () {
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88 if (_buffer_curr > _buffer) {
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89 process_buffer();
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90 }
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91 }
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92 double closure_app_seconds () {
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93 return _closure_app_seconds;
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94 }
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95 BufferingOopClosure (OopClosure *oc) :
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96 _oc(oc),
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97 _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),
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98 _closure_app_seconds(0.0) { }
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99 };
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100
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101 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP