40 G1CollectedHeap* _g1;
41 G1CollectorPolicy* _policy;
42
43 CollectionSetChooser* _cset_chooser;
44
45 uint _eden_region_length;
46 uint _survivor_region_length;
47 uint _old_region_length;
48
49 // The head of the list (via "next_in_collection_set()") representing the
50 // current collection set. Set from the incrementally built collection
51 // set at the start of the pause.
52 HeapRegion* _head;
53
54 // The number of bytes in the collection set before the pause. Set from
55 // the incrementally built collection set at the start of an evacuation
56 // pause, and incremented in finalize_old_part() when adding old regions
57 // (if any) to the collection set.
58 size_t _bytes_used_before;
59
60 size_t _recorded_rs_lengths;
61
62 // The associated information that is maintained while the incremental
63 // collection set is being built with young regions. Used to populate
64 // the recorded info for the evacuation pause.
65
66 enum CSetBuildType {
67 Active, // We are actively building the collection set
68 Inactive // We are not actively building the collection set
69 };
70
71 CSetBuildType _inc_build_state;
72
73 // The head of the incrementally built collection set.
74 HeapRegion* _inc_head;
75
76 // The tail of the incrementally built collection set.
77 HeapRegion* _inc_tail;
78
79 // The number of bytes in the incrementally built collection set.
80 // Used to set _collection_set_bytes_used_before at the start of
81 // an evacuation pause.
82 size_t _inc_bytes_used_before;
83
84 // The RSet lengths recorded for regions in the CSet. It is updated
85 // by the thread that adds a new region to the CSet. We assume that
86 // only one thread can be allocating a new CSet region (currently,
87 // it does so after taking the Heap_lock) hence no need to
88 // synchronize updates to this field.
89 size_t _inc_recorded_rs_lengths;
90
91 // A concurrent refinement thread periodically samples the young
92 // region RSets and needs to update _inc_recorded_rs_lengths as
93 // the RSets grow. Instead of having to synchronize updates to that
94 // field we accumulate them in this field and add it to
95 // _inc_recorded_rs_lengths_diffs at the start of a GC.
96 ssize_t _inc_recorded_rs_lengths_diffs;
97
98 // The predicted elapsed time it will take to collect the regions in
99 // the CSet. This is updated by the thread that adds a new region to
100 // the CSet. See the comment for _inc_recorded_rs_lengths about
101 // MT-safety assumptions.
102 double _inc_predicted_elapsed_time_ms;
103
154 _inc_tail = NULL;
155 }
156
157 // Stop adding regions to the incremental collection set
158 void stop_incremental_building() { _inc_build_state = Inactive; }
159
160 // The head of the list (via "next_in_collection_set()") representing the
161 // current collection set.
162 HeapRegion* head() { return _head; }
163
164 void clear_head() { _head = NULL; }
165
166 size_t recorded_rs_lengths() { return _recorded_rs_lengths; }
167
168 size_t bytes_used_before() const {
169 return _bytes_used_before;
170 }
171
172 void reset_bytes_used_before() {
173 _bytes_used_before = 0;
174 }
175
176 // Choose a new collection set. Marks the chosen regions as being
177 // "in_collection_set", and links them together. The head and number of
178 // the collection set are available via access methods.
179 double finalize_young_part(double target_pause_time_ms);
180 void finalize_old_part(double time_remaining_ms);
181
182 // Add old region "hr" to the CSet.
183 void add_old_region(HeapRegion* hr);
184
185 // Update information about hr in the aggregated information for
186 // the incrementally built collection set.
187 void update_young_region_prediction(HeapRegion* hr, size_t new_rs_length);
188
189 // Add hr to the LHS of the incremental collection set.
190 void add_eden_region(HeapRegion* hr);
191
192 // Add hr to the RHS of the incremental collection set.
193 void add_survivor_regions(HeapRegion* hr);
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40 G1CollectedHeap* _g1;
41 G1CollectorPolicy* _policy;
42
43 CollectionSetChooser* _cset_chooser;
44
45 uint _eden_region_length;
46 uint _survivor_region_length;
47 uint _old_region_length;
48
49 // The head of the list (via "next_in_collection_set()") representing the
50 // current collection set. Set from the incrementally built collection
51 // set at the start of the pause.
52 HeapRegion* _head;
53
54 // The number of bytes in the collection set before the pause. Set from
55 // the incrementally built collection set at the start of an evacuation
56 // pause, and incremented in finalize_old_part() when adding old regions
57 // (if any) to the collection set.
58 size_t _bytes_used_before;
59
60 // The sum of live bytes in the collection set, set as described above.
61 size_t _bytes_live_before;
62
63 size_t _recorded_rs_lengths;
64
65 // The associated information that is maintained while the incremental
66 // collection set is being built with young regions. Used to populate
67 // the recorded info for the evacuation pause.
68
69 enum CSetBuildType {
70 Active, // We are actively building the collection set
71 Inactive // We are not actively building the collection set
72 };
73
74 CSetBuildType _inc_build_state;
75
76 // The head of the incrementally built collection set.
77 HeapRegion* _inc_head;
78
79 // The tail of the incrementally built collection set.
80 HeapRegion* _inc_tail;
81
82 // The number of bytes in the incrementally built collection set.
83 // Used to set _collection_set_bytes_used_before at the start of
84 // an evacuation pause.
85 size_t _inc_bytes_used_before;
86
87 // The number of live bytes in the incrementally built collection set.
88 size_t _inc_bytes_live_before;
89
90 // The RSet lengths recorded for regions in the CSet. It is updated
91 // by the thread that adds a new region to the CSet. We assume that
92 // only one thread can be allocating a new CSet region (currently,
93 // it does so after taking the Heap_lock) hence no need to
94 // synchronize updates to this field.
95 size_t _inc_recorded_rs_lengths;
96
97 // A concurrent refinement thread periodically samples the young
98 // region RSets and needs to update _inc_recorded_rs_lengths as
99 // the RSets grow. Instead of having to synchronize updates to that
100 // field we accumulate them in this field and add it to
101 // _inc_recorded_rs_lengths_diffs at the start of a GC.
102 ssize_t _inc_recorded_rs_lengths_diffs;
103
104 // The predicted elapsed time it will take to collect the regions in
105 // the CSet. This is updated by the thread that adds a new region to
106 // the CSet. See the comment for _inc_recorded_rs_lengths about
107 // MT-safety assumptions.
108 double _inc_predicted_elapsed_time_ms;
109
160 _inc_tail = NULL;
161 }
162
163 // Stop adding regions to the incremental collection set
164 void stop_incremental_building() { _inc_build_state = Inactive; }
165
166 // The head of the list (via "next_in_collection_set()") representing the
167 // current collection set.
168 HeapRegion* head() { return _head; }
169
170 void clear_head() { _head = NULL; }
171
172 size_t recorded_rs_lengths() { return _recorded_rs_lengths; }
173
174 size_t bytes_used_before() const {
175 return _bytes_used_before;
176 }
177
178 void reset_bytes_used_before() {
179 _bytes_used_before = 0;
180 }
181
182 void reset_bytes_live_before() {
183 _bytes_live_before = 0;
184 }
185
186 // Choose a new collection set. Marks the chosen regions as being
187 // "in_collection_set", and links them together. The head and number of
188 // the collection set are available via access methods.
189 double finalize_young_part(double target_pause_time_ms);
190 void finalize_old_part(double time_remaining_ms);
191
192 // Add old region "hr" to the CSet.
193 void add_old_region(HeapRegion* hr);
194
195 // Update information about hr in the aggregated information for
196 // the incrementally built collection set.
197 void update_young_region_prediction(HeapRegion* hr, size_t new_rs_length);
198
199 // Add hr to the LHS of the incremental collection set.
200 void add_eden_region(HeapRegion* hr);
201
202 // Add hr to the RHS of the incremental collection set.
203 void add_survivor_regions(HeapRegion* hr);
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