8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
26
27 #include "memory/allocation.hpp"
28 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
29
30 class Thread;
31 class ShenandoahHeapRegionSet;
32 class ShenandoahHeap;
33 class ShenandoahStrDedupQueue;
34
35 class ShenandoahTraversalGC : public CHeapObj<mtGC> {
36 private:
37 ShenandoahHeap* _heap;
38 ShenandoahObjToScanQueueSet* _task_queues;
39
40 // Used for buffering per-region liveness data.
41 // Needed since ShenandoahHeapRegion uses atomics to update liveness.
42 //
43 // The array has max-workers elements, each of which is an array of
44 // jushort * max_regions. The choice of jushort is not accidental:
45 // there is a tradeoff between static/dynamic footprint that translates
46 // into cache pressure (which is already high during marking), and
47 // too many atomic updates. size_t/jint is too large, jbyte is too small.
48 jushort** _liveness_local;
49
50 public:
51 ShenandoahTraversalGC(ShenandoahHeap* heap, size_t num_regions);
52 ~ShenandoahTraversalGC();
53
54 void reset();
55 void prepare();
56 void init_traversal_collection();
57 void concurrent_traversal_collection();
58 void final_traversal_collection();
59
60 template <class T, bool STRING_DEDUP, bool DEGEN>
61 inline void process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, ShenandoahStrDedupQueue* dq = NULL);
62
63 bool check_and_handle_cancelled_gc(ParallelTaskTerminator* terminator);
64
65 ShenandoahObjToScanQueueSet* task_queues();
66
67 jushort* get_liveness(uint worker_id);
68 void flush_liveness(uint worker_id);
69
70 void main_loop(uint worker_id, ParallelTaskTerminator* terminator, bool do_satb);
71
72 private:
73
74 template <bool DO_SATB>
75 void main_loop_prework(uint w, ParallelTaskTerminator* t);
76
77 template <class T, bool DO_SATB>
78 void main_loop_work(T* cl, jushort* live_data, uint worker_id, ParallelTaskTerminator* terminator);
79
80 void preclean_weak_refs();
81 void weak_refs_work();
82 void weak_refs_work_doit();
83
84 void fixup_roots();
85 };
86
87 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
|
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
26
27 #include "memory/allocation.hpp"
28 #include "gc/shenandoah/shenandoahHeapRegionSet.hpp"
29 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
30
31 class Thread;
32 class ShenandoahHeapRegionSet;
33 class ShenandoahHeap;
34 class ShenandoahStrDedupQueue;
35
36 class ShenandoahTraversalGC : public CHeapObj<mtGC> {
37 private:
38 ShenandoahHeap* _heap;
39 ShenandoahObjToScanQueueSet* _task_queues;
40
41 // Used for buffering per-region liveness data.
42 // Needed since ShenandoahHeapRegion uses atomics to update liveness.
43 //
44 // The array has max-workers elements, each of which is an array of
45 // jushort * max_regions. The choice of jushort is not accidental:
46 // there is a tradeoff between static/dynamic footprint that translates
47 // into cache pressure (which is already high during marking), and
48 // too many atomic updates. size_t/jint is too large, jbyte is too small.
49 jushort** _liveness_local;
50
51 ShenandoahHeapRegionSet* const _traversal_set;
52 ShenandoahHeapRegionSet* const _root_regions;
53
54 ShenandoahHeapRegionSetIterator _root_regions_iterator;
55
56 ShenandoahConnectionMatrix* const _matrix;
57
58 public:
59 ShenandoahTraversalGC(ShenandoahHeap* heap, size_t num_regions);
60 ~ShenandoahTraversalGC();
61
62 ShenandoahHeapRegionSet* const traversal_set() const { return _traversal_set; }
63 ShenandoahHeapRegionSet* const root_regions() const { return _root_regions;}
64
65 void reset();
66 void prepare();
67 void init_traversal_collection();
68 void concurrent_traversal_collection();
69 void final_traversal_collection();
70
71 template <class T, bool STRING_DEDUP, bool DEGEN, bool UPDATE_MATRIX>
72 inline void process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, oop base_obj, ShenandoahStrDedupQueue* dq = NULL);
73
74 bool check_and_handle_cancelled_gc(ParallelTaskTerminator* terminator);
75
76 ShenandoahObjToScanQueueSet* task_queues();
77
78 jushort* get_liveness(uint worker_id);
79 void flush_liveness(uint worker_id);
80
81 void main_loop(uint worker_id, ParallelTaskTerminator* terminator, bool do_satb);
82
83 private:
84
85 void prepare_regions();
86
87 template <bool DO_SATB>
88 void main_loop_prework(uint w, ParallelTaskTerminator* t);
89
90 template <class T, bool DO_SATB>
91 void main_loop_work(T* cl, jushort* live_data, uint worker_id, ParallelTaskTerminator* terminator);
92
93 void preclean_weak_refs();
94 void weak_refs_work();
95 void weak_refs_work_doit();
96
97 void fixup_roots();
98 };
99
100 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP
|