17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/g1CollectedHeap.inline.hpp"
27 #include "gc/g1/g1Predictions.hpp"
28 #include "gc/g1/heapRegion.hpp"
29 #include "gc/g1/survRateGroup.hpp"
30 #include "logging/log.hpp"
31 #include "memory/allocation.hpp"
32
33 SurvRateGroup::SurvRateGroup() :
34 _stats_arrays_length(0),
35 _accum_surv_rate_pred(NULL),
36 _last_pred(0.0),
37 _surv_rate_pred(NULL),
38 _all_regions_allocated(0),
39 _region_num(0),
40 _setup_seq_num(0)
41 {
42 reset();
43 start_adding_regions();
44 }
45
46 void SurvRateGroup::reset() {
47 _all_regions_allocated = 0;
48 _setup_seq_num = 0;
49 _last_pred = 0.0;
50 // the following will set up the arrays with length 1
51 _region_num = 1;
52
53 // The call to stop_adding_regions() will use "new" to refill
54 // the _surv_rate_pred array, so we need to make sure to call
55 // "delete".
56 for (size_t i = 0; i < _stats_arrays_length; ++i) {
57 delete _surv_rate_pred[i];
58 }
59 _stats_arrays_length = 0;
60
61 stop_adding_regions();
62
63 // Seed initial _surv_rate_pred and _accum_surv_rate_pred values
64 guarantee( _stats_arrays_length == 1, "invariant" );
65 guarantee( _surv_rate_pred[0] != NULL, "invariant" );
66 const double initial_surv_rate = 0.4;
67 _surv_rate_pred[0]->add(initial_surv_rate);
68 _last_pred = _accum_surv_rate_pred[0] = initial_surv_rate;
69
70 _region_num = 0;
71 }
72
73 void SurvRateGroup::start_adding_regions() {
74 _setup_seq_num = _stats_arrays_length;
75 _region_num = 0;
76 }
77
78 void SurvRateGroup::stop_adding_regions() {
79 if (_region_num > _stats_arrays_length) {
80 _accum_surv_rate_pred = REALLOC_C_HEAP_ARRAY(double, _accum_surv_rate_pred, _region_num, mtGC);
81 _surv_rate_pred = REALLOC_C_HEAP_ARRAY(TruncatedSeq*, _surv_rate_pred, _region_num, mtGC);
82
83 for (size_t i = _stats_arrays_length; i < _region_num; ++i) {
84 _surv_rate_pred[i] = new TruncatedSeq(10);
85 }
86
87 _stats_arrays_length = _region_num;
88 }
89 }
90
91 void SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
92 guarantee( 0 <= age_in_group && (size_t) age_in_group < _region_num,
93 "pre-condition" );
94
95 double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
96 _surv_rate_pred[age_in_group]->add(surv_rate);
97 }
98
99 void SurvRateGroup::all_surviving_words_recorded(const G1Predictions& predictor, bool update_predictors) {
100 if (update_predictors) {
101 fill_in_last_surv_rates();
102 }
103 finalize_predictions(predictor);
104 }
105
106 void SurvRateGroup::fill_in_last_surv_rates() {
107 if (_region_num > 0) { // conservative
108 double surv_rate = _surv_rate_pred[_region_num-1]->last();
109 for (size_t i = _region_num; i < _stats_arrays_length; ++i) {
110 _surv_rate_pred[i]->add(surv_rate);
111 }
112 }
113 }
114
115 void SurvRateGroup::finalize_predictions(const G1Predictions& predictor) {
116 double accum = 0.0;
117 double pred = 0.0;
118 for (size_t i = 0; i < _stats_arrays_length; ++i) {
119 pred = predictor.get_new_unit_prediction(_surv_rate_pred[i]);
120 accum += pred;
121 _accum_surv_rate_pred[i] = accum;
122 }
123 _last_pred = pred;
124 }
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/g1CollectedHeap.inline.hpp"
27 #include "gc/g1/g1Predictions.hpp"
28 #include "gc/g1/heapRegion.hpp"
29 #include "gc/g1/survRateGroup.hpp"
30 #include "logging/log.hpp"
31 #include "memory/allocation.hpp"
32
33 SurvRateGroup::SurvRateGroup() :
34 _stats_arrays_length(0),
35 _accum_surv_rate_pred(NULL),
36 _last_pred(0.0),
37 _surv_rate_predictors(NULL),
38 _num_added_regions(0) {
39 reset();
40 start_adding_regions();
41 }
42
43 void SurvRateGroup::reset() {
44 _last_pred = 0.0;
45 // the following will set up the arrays with length 1
46 _num_added_regions = 1;
47
48 // The call to stop_adding_regions() will use "new" to refill
49 // the _surv_rate_pred array, so we need to make sure to call
50 // "delete".
51 for (size_t i = 0; i < _stats_arrays_length; ++i) {
52 delete _surv_rate_predictors[i];
53 }
54 _stats_arrays_length = 0;
55
56 stop_adding_regions();
57
58 // Seed initial _surv_rate_pred and _accum_surv_rate_pred values
59 guarantee(_stats_arrays_length == 1, "invariant" );
60 guarantee(_surv_rate_predictors[0] != NULL, "invariant" );
61 const double initial_surv_rate = 0.4;
62 _surv_rate_predictors[0]->add(initial_surv_rate);
63 _last_pred = _accum_surv_rate_pred[0] = initial_surv_rate;
64
65 _num_added_regions = 0;
66 }
67
68 void SurvRateGroup::start_adding_regions() {
69 _num_added_regions = 0;
70 }
71
72 void SurvRateGroup::stop_adding_regions() {
73 if (_num_added_regions > _stats_arrays_length) {
74 _accum_surv_rate_pred = REALLOC_C_HEAP_ARRAY(double, _accum_surv_rate_pred, _num_added_regions, mtGC);
75 _surv_rate_predictors = REALLOC_C_HEAP_ARRAY(TruncatedSeq*, _surv_rate_predictors, _num_added_regions, mtGC);
76
77 for (size_t i = _stats_arrays_length; i < _num_added_regions; ++i) {
78 _surv_rate_predictors[i] = new TruncatedSeq(10);
79 }
80
81 _stats_arrays_length = _num_added_regions;
82 }
83 }
84
85 void SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
86 guarantee(0 <= age_in_group && (size_t)age_in_group < _num_added_regions,
87 "age_in_group is %d not between 0 and " SIZE_FORMAT, age_in_group, _num_added_regions);
88
89 double surv_rate = (double)surv_words / HeapRegion::GrainWords;
90 _surv_rate_predictors[age_in_group]->add(surv_rate);
91 }
92
93 void SurvRateGroup::all_surviving_words_recorded(const G1Predictions& predictor, bool update_predictors) {
94 if (update_predictors) {
95 fill_in_last_surv_rates();
96 }
97 finalize_predictions(predictor);
98 }
99
100 void SurvRateGroup::fill_in_last_surv_rates() {
101 if (_num_added_regions > 0) { // conservative
102 double surv_rate = _surv_rate_predictors[_num_added_regions-1]->last();
103 for (size_t i = _num_added_regions; i < _stats_arrays_length; ++i) {
104 _surv_rate_predictors[i]->add(surv_rate);
105 }
106 }
107 }
108
109 void SurvRateGroup::finalize_predictions(const G1Predictions& predictor) {
110 double accum = 0.0;
111 double pred = 0.0;
112 for (size_t i = 0; i < _stats_arrays_length; ++i) {
113 pred = predictor.get_new_unit_prediction(_surv_rate_predictors[i]);
114 accum += pred;
115 _accum_surv_rate_pred[i] = accum;
116 }
117 _last_pred = pred;
118 }
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