Tue, 26 Jan 2010 16:52:29 -0800
6920090: G1: Disable ReduceInitialCardMarks at least until 6920109 is fixed
Summary: G1 now answers "no" to the query can_elide_initializing_store_barrier() in the product build. A debug flag allows alternate behaviour in debug builds.
Reviewed-by: iveresov, tonyp
1 /*
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
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 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 class ObjectClosure;
26 class JavaThread;
28 // A ptrQueue whose elements are "oops", pointers to object heads.
29 class ObjPtrQueue: public PtrQueue {
30 public:
31 ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) :
32 PtrQueue(qset_, perm)
33 {}
34 // Apply the closure to all elements, and reset the index to make the
35 // buffer empty.
36 void apply_closure(ObjectClosure* cl);
38 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
39 static void apply_closure_to_buffer(ObjectClosure* cl,
40 void** buf, size_t index, size_t sz);
42 void verify_oops_in_buffer() NOT_DEBUG_RETURN;
43 };
47 class SATBMarkQueueSet: public PtrQueueSet {
48 ObjectClosure* _closure;
49 ObjectClosure** _par_closures; // One per ParGCThread.
51 ObjPtrQueue _shared_satb_queue;
53 // Utility function to support sequential and parallel versions. If
54 // "par" is true, then "worker" is the par thread id; if "false", worker
55 // is ignored.
56 bool apply_closure_to_completed_buffer_work(bool par, int worker);
59 public:
60 SATBMarkQueueSet();
62 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
63 int process_completed_threshold,
64 Mutex* lock);
66 static void handle_zero_index_for_thread(JavaThread* t);
68 // Apply "set_active(b)" to all thread tloq's. Should be called only
69 // with the world stopped.
70 void set_active_all_threads(bool b);
72 // Register "blk" as "the closure" for all queues. Only one such closure
73 // is allowed. The "apply_closure_to_completed_buffer" method will apply
74 // this closure to a completed buffer, and "iterate_closure_all_threads"
75 // applies it to partially-filled buffers (the latter should only be done
76 // with the world stopped).
77 void set_closure(ObjectClosure* closure);
78 // Set the parallel closures: pointer is an array of pointers to
79 // closures, one for each parallel GC thread.
80 void set_par_closure(int i, ObjectClosure* closure);
82 // If there is a registered closure for buffers, apply it to all entries
83 // in all currently-active buffers. This should only be applied at a
84 // safepoint. (Currently must not be called in parallel; this should
85 // change in the future.)
86 void iterate_closure_all_threads();
87 // Parallel version of the above.
88 void par_iterate_closure_all_threads(int worker);
90 // If there exists some completed buffer, pop it, then apply the
91 // registered closure to all its elements, and return true. If no
92 // completed buffers exist, return false.
93 bool apply_closure_to_completed_buffer() {
94 return apply_closure_to_completed_buffer_work(false, 0);
95 }
96 // Parallel version of the above.
97 bool par_apply_closure_to_completed_buffer(int worker) {
98 return apply_closure_to_completed_buffer_work(true, worker);
99 }
101 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
103 // If a marking is being abandoned, reset any unprocessed log buffers.
104 void abandon_partial_marking();
106 };