Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/satbQueue.hpp @ 2133:2250ee17e258
7007068: G1: refine the BOT during evac failure handling
Summary: During evacuation failure handling we refine the BOT to reflect the location of all the objects in the regions we scan. The changeset includes some minor cleanup: a) non-product print_on() method on the G1 BOT class, b) added more complete BOT verification during heap / region verification, c) slight modification to the BOT set up for humongous regions to be more consistent with the BOT set up during evac failure handling, and d) removed a couple of unused methods.
Reviewed-by: johnc, ysr
author | tonyp |
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date | Wed, 12 Jan 2011 13:06:00 -0500 |
parents | f95d63e2154a |
children | 7e37af9d69ef |
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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_SATBQUEUE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP | |
27 | |
28 #include "gc_implementation/g1/ptrQueue.hpp" | |
29 | |
342 | 30 class ObjectClosure; |
31 class JavaThread; | |
32 | |
33 // A ptrQueue whose elements are "oops", pointers to object heads. | |
34 class ObjPtrQueue: public PtrQueue { | |
35 public: | |
36 ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) : | |
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37 // SATB queues are only active during marking cycles. We create |
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38 // them with their active field set to false. If a thread is |
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39 // created during a cycle and its SATB queue needs to be activated |
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40 // before the thread starts running, we'll need to set its active |
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41 // field to true. This is done in JavaThread::initialize_queues(). |
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42 PtrQueue(qset_, perm, false /* active */) { } |
342 | 43 // Apply the closure to all elements, and reset the index to make the |
44 // buffer empty. | |
45 void apply_closure(ObjectClosure* cl); | |
46 | |
47 // Apply the closure to all elements of "buf", down to "index" (inclusive.) | |
48 static void apply_closure_to_buffer(ObjectClosure* cl, | |
49 void** buf, size_t index, size_t sz); | |
50 | |
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51 void verify_oops_in_buffer() NOT_DEBUG_RETURN; |
342 | 52 }; |
53 | |
54 | |
55 | |
56 class SATBMarkQueueSet: public PtrQueueSet { | |
57 ObjectClosure* _closure; | |
58 ObjectClosure** _par_closures; // One per ParGCThread. | |
59 | |
60 ObjPtrQueue _shared_satb_queue; | |
61 | |
62 // Utility function to support sequential and parallel versions. If | |
63 // "par" is true, then "worker" is the par thread id; if "false", worker | |
64 // is ignored. | |
65 bool apply_closure_to_completed_buffer_work(bool par, int worker); | |
66 | |
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67 #ifdef ASSERT |
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68 void dump_active_values(JavaThread* first, bool expected_active); |
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69 #endif // ASSERT |
342 | 70 |
71 public: | |
72 SATBMarkQueueSet(); | |
73 | |
74 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 75 int process_completed_threshold, |
76 Mutex* lock); | |
342 | 77 |
78 static void handle_zero_index_for_thread(JavaThread* t); | |
79 | |
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80 // Apply "set_active(b)" to all Java threads' SATB queues. It should be |
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81 // called only with the world stopped. The method will assert that the |
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82 // SATB queues of all threads it visits, as well as the SATB queue |
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83 // set itself, has an active value same as expected_active. |
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84 void set_active_all_threads(bool b, bool expected_active); |
342 | 85 |
86 // Register "blk" as "the closure" for all queues. Only one such closure | |
87 // is allowed. The "apply_closure_to_completed_buffer" method will apply | |
88 // this closure to a completed buffer, and "iterate_closure_all_threads" | |
89 // applies it to partially-filled buffers (the latter should only be done | |
90 // with the world stopped). | |
91 void set_closure(ObjectClosure* closure); | |
92 // Set the parallel closures: pointer is an array of pointers to | |
93 // closures, one for each parallel GC thread. | |
94 void set_par_closure(int i, ObjectClosure* closure); | |
95 | |
96 // If there is a registered closure for buffers, apply it to all entries | |
97 // in all currently-active buffers. This should only be applied at a | |
98 // safepoint. (Currently must not be called in parallel; this should | |
99 // change in the future.) | |
100 void iterate_closure_all_threads(); | |
101 // Parallel version of the above. | |
102 void par_iterate_closure_all_threads(int worker); | |
103 | |
104 // If there exists some completed buffer, pop it, then apply the | |
105 // registered closure to all its elements, and return true. If no | |
106 // completed buffers exist, return false. | |
107 bool apply_closure_to_completed_buffer() { | |
108 return apply_closure_to_completed_buffer_work(false, 0); | |
109 } | |
110 // Parallel version of the above. | |
111 bool par_apply_closure_to_completed_buffer(int worker) { | |
112 return apply_closure_to_completed_buffer_work(true, worker); | |
113 } | |
114 | |
115 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } | |
116 | |
117 // If a marking is being abandoned, reset any unprocessed log buffers. | |
118 void abandon_partial_marking(); | |
119 | |
120 }; | |
1972 | 121 |
122 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP |