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src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@0bfd3fb24150 (annotated)
src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp
Tue, 13 Apr 2010 13:52:10 -0700
- author
- jmasa
- date
- Tue, 13 Apr 2010 13:52:10 -0700
- changeset 1822
- 0bfd3fb24150
- parent 1546
- 44f61c24ddab
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes
| ysr@777 | 1 | /* |
| xdono@1279 | 2 | * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| ysr@777 | 4 | * |
| ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
| ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| ysr@777 | 7 | * published by the Free Software Foundation. |
| ysr@777 | 8 | * |
| ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| ysr@777 | 13 | * accompanied this code). |
| ysr@777 | 14 | * |
| ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
| ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| ysr@777 | 18 | * |
| ysr@777 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| ysr@777 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| ysr@777 | 21 | * have any questions. |
| ysr@777 | 22 | * |
| ysr@777 | 23 | */ |
| ysr@777 | 24 | |
| ysr@777 | 25 | // Forward Decl. |
| ysr@777 | 26 | class ConcurrentG1Refine; |
| ysr@777 | 27 | |
| ysr@777 | 28 | // The G1 Concurrent Refinement Thread (could be several in the future). |
| ysr@777 | 29 | |
| ysr@777 | 30 | class ConcurrentG1RefineThread: public ConcurrentGCThread { |
| ysr@777 | 31 | friend class VMStructs; |
| ysr@777 | 32 | friend class G1CollectedHeap; |
| ysr@777 | 33 | |
| ysr@777 | 34 | double _vtime_start; // Initial virtual time. |
| ysr@777 | 35 | double _vtime_accum; // Initial virtual time. |
| iveresov@1229 | 36 | int _worker_id; |
| iveresov@1230 | 37 | int _worker_id_offset; |
| ysr@777 | 38 | |
| iveresov@1229 | 39 | // The refinement threads collection is linked list. A predecessor can activate a successor |
| iveresov@1229 | 40 | // when the number of the rset update buffer crosses a certain threshold. A successor |
| iveresov@1229 | 41 | // would self-deactivate when the number of the buffers falls below the threshold. |
| iveresov@1229 | 42 | bool _active; |
| iveresov@1546 | 43 | ConcurrentG1RefineThread* _next; |
| iveresov@1546 | 44 | Monitor* _monitor; |
| iveresov@1546 | 45 | ConcurrentG1Refine* _cg1r; |
| ysr@777 | 46 | |
| iveresov@1546 | 47 | int _thread_threshold_step; |
| iveresov@1546 | 48 | // This thread activation threshold |
| iveresov@1546 | 49 | int _threshold; |
| iveresov@1546 | 50 | // This thread deactivation threshold |
| iveresov@1546 | 51 | int _deactivation_threshold; |
| iveresov@1229 | 52 | |
| iveresov@1546 | 53 | void sample_young_list_rs_lengths(); |
| iveresov@1546 | 54 | void run_young_rs_sampling(); |
| iveresov@1546 | 55 | void wait_for_completed_buffers(); |
| ysr@777 | 56 | |
| iveresov@1546 | 57 | void set_active(bool x) { _active = x; } |
| iveresov@1546 | 58 | bool is_active(); |
| iveresov@1546 | 59 | void activate(); |
| iveresov@1546 | 60 | void deactivate(); |
| ysr@777 | 61 | |
| ysr@777 | 62 | // For use by G1CollectedHeap, which is a friend. |
| ysr@777 | 63 | static SuspendibleThreadSet* sts() { return &_sts; } |
| ysr@777 | 64 | |
| iveresov@1546 | 65 | public: |
| iveresov@1546 | 66 | virtual void run(); |
| ysr@777 | 67 | // Constructor |
| iveresov@1230 | 68 | ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next, |
| iveresov@1230 | 69 | int worker_id_offset, int worker_id); |
| ysr@777 | 70 | |
| iveresov@1546 | 71 | void initialize(); |
| iveresov@1546 | 72 | |
| ysr@777 | 73 | // Printing |
| tonyp@1454 | 74 | void print() const; |
| tonyp@1454 | 75 | void print_on(outputStream* st) const; |
| ysr@777 | 76 | |
| ysr@777 | 77 | // Total virtual time so far. |
| ysr@777 | 78 | double vtime_accum() { return _vtime_accum; } |
| ysr@777 | 79 | |
| iveresov@1546 | 80 | ConcurrentG1Refine* cg1r() { return _cg1r; } |
| ysr@777 | 81 | |
| ysr@777 | 82 | // Yield for GC |
| iveresov@1546 | 83 | void yield(); |
| ysr@777 | 84 | // shutdown |
| iveresov@1229 | 85 | void stop(); |
| ysr@777 | 86 | }; |
