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 #include "precompiled.hpp"
25 #include "gc_implementation/shenandoah/shenandoahCollectionSet.hpp"
26 #include "gc_implementation/shenandoah/shenandoahCollectionSet.inline.hpp"
27 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
28 #include "gc_implementation/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
30 #include "gc_implementation/shenandoah/shenandoahHeapRegionSet.hpp"
31 #include "runtime/atomic.hpp"
32 #include "utilities/copy.hpp"
33
34 ShenandoahCollectionSet::ShenandoahCollectionSet(ShenandoahHeap* heap, HeapWord* heap_base) :
35 _garbage(0), _live_data(0), _heap(heap), _region_count(0),
36 _map_size(heap->num_regions()), _current_index(0) {
37 // Use 1-byte data type
38 STATIC_ASSERT(sizeof(jbyte) == 1);
39
40 _cset_map = NEW_C_HEAP_ARRAY(jbyte, _map_size, mtGC);
41 // Bias cset map's base address for fast test if an oop is in cset
42 _biased_cset_map = _cset_map - ((uintx)heap_base >> ShenandoahHeapRegion::region_size_bytes_shift());
43
44 // Initialize cset map
45 Copy::zero_to_bytes(_cset_map, _map_size);
46 }
47
48 void ShenandoahCollectionSet::add_region(ShenandoahHeapRegion* r) {
49 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
50 assert(Thread::current()->is_VM_thread(), "Must be VMThread");
51 assert(!is_in(r), "Already in collection set");
52 _cset_map[r->region_number()] = 1;
53 _region_count ++;
54 _garbage += r->garbage();
55 _live_data += r->get_live_data_bytes();
56 }
57
58 void ShenandoahCollectionSet::remove_region(ShenandoahHeapRegion* r) {
59 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
60 assert(Thread::current()->is_VM_thread(), "Must be VMThread");
61 assert(is_in(r), "Not in collection set");
62 _cset_map[r->region_number()] = 0;
63 _region_count --;
64 }
65
66 void ShenandoahCollectionSet::update_region_status() {
67 for (size_t index = 0; index < _heap->num_regions(); index ++) {
68 ShenandoahHeapRegion* r = _heap->get_region(index);
69 if (is_in(r)) {
70 r->make_cset();
71 } else {
72 assert (!r->is_cset(), "should not be cset");
73 }
74 }
75 }
76
77 void ShenandoahCollectionSet::clear() {
78 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
79 Copy::zero_to_bytes(_cset_map, _map_size);
80
81 #ifdef ASSERT
82 for (size_t index = 0; index < _heap->num_regions(); index ++) {
83 assert (!_heap->get_region(index)->is_cset(), "should have been cleared before");
84 }
85 #endif
86
87 _garbage = 0;
88 _live_data = 0;
89
90 _region_count = 0;
91 _current_index = 0;
92 }
93
94 ShenandoahHeapRegion* ShenandoahCollectionSet::claim_next() {
95 size_t num_regions = _heap->num_regions();
96 if (_current_index >= (jint)num_regions) {
97 return NULL;
98 }
99
100 jint saved_current = _current_index;
101 size_t index = (size_t)saved_current;
102
103 while(index < num_regions) {
104 if (is_in(index)) {
105 jint cur = Atomic::cmpxchg((jint)(index + 1), &_current_index, saved_current);
106 assert(cur >= (jint)saved_current, "Must move forward");
107 if (cur == saved_current) {
108 assert(is_in(index), "Invariant");
|
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 #include "precompiled.hpp"
25 #include "gc_implementation/shenandoah/shenandoahCollectionSet.hpp"
26 #include "gc_implementation/shenandoah/shenandoahCollectionSet.inline.hpp"
27 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
28 #include "gc_implementation/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
30 #include "gc_implementation/shenandoah/shenandoahHeapRegionSet.hpp"
31 #include "runtime/atomic.hpp"
32 #include "utilities/copy.hpp"
33
34 ShenandoahCollectionSet::ShenandoahCollectionSet(ShenandoahHeap* heap, HeapWord* heap_base) :
35 _map_size(heap->num_regions()),
36 _region_size_bytes_shift(ShenandoahHeapRegion::region_size_bytes_shift()),
37 _cset_map(NEW_C_HEAP_ARRAY(jbyte, _map_size, mtGC)),
38 _biased_cset_map(_cset_map - ((uintx)heap_base >> _region_size_bytes_shift)),
39 _heap(heap),
40 _garbage(0),
41 _live_data(0),
42 _used(0),
43 _region_count(0),
44 _current_index(0) {
45 // Use 1-byte data type
46 STATIC_ASSERT(sizeof(jbyte) == 1);
47
48 // Initialize cset map
49 Copy::zero_to_bytes(_cset_map, _map_size);
50 }
51
52 void ShenandoahCollectionSet::add_region(ShenandoahHeapRegion* r) {
53 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
54 assert(Thread::current()->is_VM_thread(), "Must be VMThread");
55 assert(!is_in(r), "Already in collection set");
56 _cset_map[r->region_number()] = 1;
57 _region_count ++;
58 _garbage += r->garbage();
59 _live_data += r->get_live_data_bytes();
60 _used += r->used();
61 }
62
63 void ShenandoahCollectionSet::remove_region(ShenandoahHeapRegion* r) {
64 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
65 assert(Thread::current()->is_VM_thread(), "Must be VMThread");
66 assert(is_in(r), "Not in collection set");
67 _cset_map[r->region_number()] = 0;
68 _region_count --;
69 }
70
71 void ShenandoahCollectionSet::update_region_status() {
72 for (size_t index = 0; index < _heap->num_regions(); index ++) {
73 ShenandoahHeapRegion* r = _heap->get_region(index);
74 if (is_in(r)) {
75 r->make_cset();
76 } else {
77 assert (!r->is_cset(), "should not be cset");
78 }
79 }
80 }
81
82 void ShenandoahCollectionSet::clear() {
83 assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Must be at a safepoint");
84 Copy::zero_to_bytes(_cset_map, _map_size);
85
86 #ifdef ASSERT
87 for (size_t index = 0; index < _heap->num_regions(); index ++) {
88 assert (!_heap->get_region(index)->is_cset(), "should have been cleared before");
89 }
90 #endif
91
92 _garbage = 0;
93 _live_data = 0;
94 _used = 0;
95
96 _region_count = 0;
97 _current_index = 0;
98 }
99
100 ShenandoahHeapRegion* ShenandoahCollectionSet::claim_next() {
101 size_t num_regions = _heap->num_regions();
102 if (_current_index >= (jint)num_regions) {
103 return NULL;
104 }
105
106 jint saved_current = _current_index;
107 size_t index = (size_t)saved_current;
108
109 while(index < num_regions) {
110 if (is_in(index)) {
111 jint cur = Atomic::cmpxchg((jint)(index + 1), &_current_index, saved_current);
112 assert(cur >= (jint)saved_current, "Must move forward");
113 if (cur == saved_current) {
114 assert(is_in(index), "Invariant");
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