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src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp@710a3c8b516e (annotated)
src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6231
- 889068b9a088
- parent 0
- f90c822e73f8
- child 7535
- 7ae4e26cb1e0
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP |
| aoqi@0 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "memory/genOopClosures.hpp" |
| aoqi@0 | 29 | #include "memory/generation.hpp" |
| aoqi@0 | 30 | #include "runtime/os.hpp" |
| aoqi@0 | 31 | #include "utilities/taskqueue.hpp" |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | // A BufferingOops closure tries to separate out the cost of finding roots |
| aoqi@0 | 34 | // from the cost of applying closures to them. It maintains an array of |
| aoqi@0 | 35 | // ref-containing locations. Until the array is full, applying the closure |
| aoqi@0 | 36 | // to an oop* merely records that location in the array. Since this |
| aoqi@0 | 37 | // closure app cost is small, an elapsed timer can approximately attribute |
| aoqi@0 | 38 | // all of this cost to the cost of finding the roots. When the array fills |
| aoqi@0 | 39 | // up, the wrapped closure is applied to all elements, keeping track of |
| aoqi@0 | 40 | // this elapsed time of this process, and leaving the array empty. |
| aoqi@0 | 41 | // The caller must be sure to call "done" to process any unprocessed |
| aoqi@0 | 42 | // buffered entriess. |
| aoqi@0 | 43 | |
| aoqi@0 | 44 | class Generation; |
| aoqi@0 | 45 | class HeapRegion; |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | class BufferingOopClosure: public OopClosure { |
| aoqi@0 | 48 | protected: |
| aoqi@0 | 49 | enum PrivateConstants { |
| aoqi@0 | 50 | BufferLength = 1024 |
| aoqi@0 | 51 | }; |
| aoqi@0 | 52 | |
| aoqi@0 | 53 | StarTask _buffer[BufferLength]; |
| aoqi@0 | 54 | StarTask* _buffer_top; |
| aoqi@0 | 55 | StarTask* _buffer_curr; |
| aoqi@0 | 56 | |
| aoqi@0 | 57 | OopClosure* _oc; |
| aoqi@0 | 58 | double _closure_app_seconds; |
| aoqi@0 | 59 | |
| aoqi@0 | 60 | void process_buffer () { |
| aoqi@0 | 61 | double start = os::elapsedTime(); |
| aoqi@0 | 62 | for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) { |
| aoqi@0 | 63 | if (curr->is_narrow()) { |
| aoqi@0 | 64 | assert(UseCompressedOops, "Error"); |
| aoqi@0 | 65 | _oc->do_oop((narrowOop*)(*curr)); |
| aoqi@0 | 66 | } else { |
| aoqi@0 | 67 | _oc->do_oop((oop*)(*curr)); |
| aoqi@0 | 68 | } |
| aoqi@0 | 69 | } |
| aoqi@0 | 70 | _buffer_curr = _buffer; |
| aoqi@0 | 71 | _closure_app_seconds += (os::elapsedTime() - start); |
| aoqi@0 | 72 | } |
| aoqi@0 | 73 | |
| aoqi@0 | 74 | template <class T> inline void do_oop_work(T* p) { |
| aoqi@0 | 75 | if (_buffer_curr == _buffer_top) { |
| aoqi@0 | 76 | process_buffer(); |
| aoqi@0 | 77 | } |
| aoqi@0 | 78 | StarTask new_ref(p); |
| aoqi@0 | 79 | *_buffer_curr = new_ref; |
| aoqi@0 | 80 | ++_buffer_curr; |
| aoqi@0 | 81 | } |
| aoqi@0 | 82 | |
| aoqi@0 | 83 | public: |
| aoqi@0 | 84 | virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
| aoqi@0 | 85 | virtual void do_oop(oop* p) { do_oop_work(p); } |
| aoqi@0 | 86 | |
| aoqi@0 | 87 | void done () { |
| aoqi@0 | 88 | if (_buffer_curr > _buffer) { |
| aoqi@0 | 89 | process_buffer(); |
| aoqi@0 | 90 | } |
| aoqi@0 | 91 | } |
| aoqi@0 | 92 | double closure_app_seconds () { |
| aoqi@0 | 93 | return _closure_app_seconds; |
| aoqi@0 | 94 | } |
| aoqi@0 | 95 | BufferingOopClosure (OopClosure *oc) : |
| aoqi@0 | 96 | _oc(oc), |
| aoqi@0 | 97 | _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength), |
| aoqi@0 | 98 | _closure_app_seconds(0.0) { } |
| aoqi@0 | 99 | }; |
| aoqi@0 | 100 | |
| aoqi@0 | 101 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP |
