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
ysr@777 | 1 | /* |
ysr@777 | 2 | * Copyright 2001-2007 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 | class ObjectClosure; |
ysr@777 | 26 | class JavaThread; |
ysr@777 | 27 | |
ysr@777 | 28 | // A ptrQueue whose elements are "oops", pointers to object heads. |
ysr@777 | 29 | class ObjPtrQueue: public PtrQueue { |
ysr@777 | 30 | public: |
ysr@777 | 31 | ObjPtrQueue(PtrQueueSet* qset_, bool perm = false) : |
ysr@777 | 32 | PtrQueue(qset_, perm) |
ysr@777 | 33 | {} |
ysr@777 | 34 | // Apply the closure to all elements, and reset the index to make the |
ysr@777 | 35 | // buffer empty. |
ysr@777 | 36 | void apply_closure(ObjectClosure* cl); |
ysr@777 | 37 | |
ysr@777 | 38 | // Apply the closure to all elements of "buf", down to "index" (inclusive.) |
ysr@777 | 39 | static void apply_closure_to_buffer(ObjectClosure* cl, |
ysr@777 | 40 | void** buf, size_t index, size_t sz); |
ysr@777 | 41 | |
ysr@1280 | 42 | void verify_oops_in_buffer() NOT_DEBUG_RETURN; |
ysr@777 | 43 | }; |
ysr@777 | 44 | |
ysr@777 | 45 | |
ysr@777 | 46 | |
ysr@777 | 47 | class SATBMarkQueueSet: public PtrQueueSet { |
ysr@777 | 48 | ObjectClosure* _closure; |
ysr@777 | 49 | ObjectClosure** _par_closures; // One per ParGCThread. |
ysr@777 | 50 | |
ysr@777 | 51 | ObjPtrQueue _shared_satb_queue; |
ysr@777 | 52 | |
ysr@777 | 53 | // Utility function to support sequential and parallel versions. If |
ysr@777 | 54 | // "par" is true, then "worker" is the par thread id; if "false", worker |
ysr@777 | 55 | // is ignored. |
ysr@777 | 56 | bool apply_closure_to_completed_buffer_work(bool par, int worker); |
ysr@777 | 57 | |
ysr@777 | 58 | |
ysr@777 | 59 | public: |
ysr@777 | 60 | SATBMarkQueueSet(); |
ysr@777 | 61 | |
ysr@777 | 62 | void initialize(Monitor* cbl_mon, Mutex* fl_lock, |
iveresov@1546 | 63 | int process_completed_threshold, |
iveresov@1546 | 64 | Mutex* lock); |
ysr@777 | 65 | |
ysr@777 | 66 | static void handle_zero_index_for_thread(JavaThread* t); |
ysr@777 | 67 | |
ysr@777 | 68 | // Apply "set_active(b)" to all thread tloq's. Should be called only |
ysr@777 | 69 | // with the world stopped. |
ysr@777 | 70 | void set_active_all_threads(bool b); |
ysr@777 | 71 | |
ysr@777 | 72 | // Register "blk" as "the closure" for all queues. Only one such closure |
ysr@777 | 73 | // is allowed. The "apply_closure_to_completed_buffer" method will apply |
ysr@777 | 74 | // this closure to a completed buffer, and "iterate_closure_all_threads" |
ysr@777 | 75 | // applies it to partially-filled buffers (the latter should only be done |
ysr@777 | 76 | // with the world stopped). |
ysr@777 | 77 | void set_closure(ObjectClosure* closure); |
ysr@777 | 78 | // Set the parallel closures: pointer is an array of pointers to |
ysr@777 | 79 | // closures, one for each parallel GC thread. |
ysr@777 | 80 | void set_par_closure(int i, ObjectClosure* closure); |
ysr@777 | 81 | |
ysr@777 | 82 | // If there is a registered closure for buffers, apply it to all entries |
ysr@777 | 83 | // in all currently-active buffers. This should only be applied at a |
ysr@777 | 84 | // safepoint. (Currently must not be called in parallel; this should |
ysr@777 | 85 | // change in the future.) |
ysr@777 | 86 | void iterate_closure_all_threads(); |
ysr@777 | 87 | // Parallel version of the above. |
ysr@777 | 88 | void par_iterate_closure_all_threads(int worker); |
ysr@777 | 89 | |
ysr@777 | 90 | // If there exists some completed buffer, pop it, then apply the |
ysr@777 | 91 | // registered closure to all its elements, and return true. If no |
ysr@777 | 92 | // completed buffers exist, return false. |
ysr@777 | 93 | bool apply_closure_to_completed_buffer() { |
ysr@777 | 94 | return apply_closure_to_completed_buffer_work(false, 0); |
ysr@777 | 95 | } |
ysr@777 | 96 | // Parallel version of the above. |
ysr@777 | 97 | bool par_apply_closure_to_completed_buffer(int worker) { |
ysr@777 | 98 | return apply_closure_to_completed_buffer_work(true, worker); |
ysr@777 | 99 | } |
ysr@777 | 100 | |
ysr@777 | 101 | ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; } |
ysr@777 | 102 | |
ysr@777 | 103 | // If a marking is being abandoned, reset any unprocessed log buffers. |
ysr@777 | 104 | void abandon_partial_marking(); |
ysr@777 | 105 | |
ysr@777 | 106 | }; |