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 2001-2009 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 G1CollectorPolicy;
27 class SurvRateGroup : public CHeapObj {
28 private:
29 G1CollectorPolicy* _g1p;
30 const char* _name;
32 size_t _stats_arrays_length;
33 double* _surv_rate;
34 double* _accum_surv_rate_pred;
35 double _last_pred;
36 double _accum_surv_rate;
37 TruncatedSeq** _surv_rate_pred;
38 NumberSeq** _summary_surv_rates;
39 size_t _summary_surv_rates_len;
40 size_t _summary_surv_rates_max_len;
42 int _all_regions_allocated;
43 size_t _region_num;
44 size_t _scan_only_prefix;
45 size_t _setup_seq_num;
47 public:
48 SurvRateGroup(G1CollectorPolicy* g1p,
49 const char* name,
50 size_t summary_surv_rates_len);
51 void reset();
52 void start_adding_regions();
53 void stop_adding_regions();
54 void record_scan_only_prefix(size_t scan_only_prefix);
55 void record_surviving_words(int age_in_group, size_t surv_words);
56 void all_surviving_words_recorded(bool propagate);
57 const char* name() { return _name; }
59 size_t region_num() { return _region_num; }
60 size_t scan_only_length() { return _scan_only_prefix; }
61 double accum_surv_rate_pred(int age) {
62 assert(age >= 0, "must be");
63 if ((size_t)age < _stats_arrays_length)
64 return _accum_surv_rate_pred[age];
65 else {
66 double diff = (double) (age - _stats_arrays_length + 1);
67 return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
68 }
69 }
71 double accum_surv_rate(size_t adjustment);
73 TruncatedSeq* get_seq(size_t age) {
74 if (age >= _setup_seq_num) {
75 guarantee( _setup_seq_num > 0, "invariant" );
76 age = _setup_seq_num-1;
77 }
78 TruncatedSeq* seq = _surv_rate_pred[age];
79 guarantee( seq != NULL, "invariant" );
80 return seq;
81 }
83 int next_age_index();
84 int age_in_group(int age_index) {
85 int ret = (int) (_all_regions_allocated - age_index);
86 assert( ret >= 0, "invariant" );
87 return ret;
88 }
89 int recalculate_age_index(int age_index) {
90 int new_age_index = (int) _scan_only_prefix - age_in_group(age_index);
91 guarantee( new_age_index >= 0, "invariant" );
92 return new_age_index;
93 }
94 void finished_recalculating_age_indexes() {
95 _all_regions_allocated = (int) _scan_only_prefix;
96 }
98 #ifndef PRODUCT
99 void print();
100 void print_surv_rate_summary();
101 #endif // PRODUCT
102 };