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 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 #ifndef SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
26 #define SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
27
28 #include "memory/allocation.hpp"
29 #include "jfr/utilities/jfrTime.hpp"
30
31 class BoolObjectClosure;
32 class OopClosure;
33 class ObjectSample;
34 class ObjectSampler;
35 class SampleList;
36 class SamplePriorityQueue;
37 class Thread;
38
39 // Class reponsible for holding samples and
40 // making sure the samples are evenly distributed as
41 // new entries are added and removed.
42 class ObjectSampler : public CHeapObj<mtTracing> {
43 friend class LeakProfiler;
44 friend class ObjectSampleCheckpoint;
45 friend class StartOperation;
46 friend class StopOperation;
47 friend class EmitEventOperation;
48 private:
49 SamplePriorityQueue* _priority_queue;
50 SampleList* _list;
51 JfrTicks _last_sweep;
52 size_t _total_allocated;
53 size_t _threshold;
54 size_t _size;
55 volatile int _tryLock;
56 bool _dead_samples;
57
58 explicit ObjectSampler(size_t size);
59 ~ObjectSampler();
60
61 void add(HeapWord* object, size_t size, JavaThread* thread);
62 void remove_dead(ObjectSample* sample);
63 void scavenge();
64
65 // Called by GC
66 void oops_do(BoolObjectClosure* is_alive, OopClosure* f);
67
68 public:
69 const ObjectSample* item_at(int index) const;
70 ObjectSample* item_at(int index);
71 int item_count() const;
72 const ObjectSample* first() const;
73 const ObjectSample* last() const;
74 const ObjectSample* last_resolved() const;
75 void set_last_resolved(const ObjectSample* sample);
76 const JfrTicks& last_sweep() const;
77 };
78
79 #endif // SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
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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 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 #ifndef SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
26 #define SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
27
28 #include "memory/allocation.hpp"
29 #include "jfr/utilities/jfrTime.hpp"
30
31 typedef u8 traceid;
32
33 class BoolObjectClosure;
34 class JfrStackTrace;
35 class OopClosure;
36 class ObjectSample;
37 class ObjectSampler;
38 class SampleList;
39 class SamplePriorityQueue;
40 class Thread;
41
42 // Class reponsible for holding samples and
43 // making sure the samples are evenly distributed as
44 // new entries are added and removed.
45 class ObjectSampler : public CHeapObj<mtTracing> {
46 friend class EventEmitter;
47 friend class JfrRecorderService;
48 friend class LeakProfiler;
49 friend class StartOperation;
50 friend class StopOperation;
51 friend class ObjectSampleCheckpoint;
52 friend class WriteObjectSampleStacktrace;
53 private:
54 SamplePriorityQueue* _priority_queue;
55 SampleList* _list;
56 JfrTicks _last_sweep;
57 size_t _total_allocated;
58 size_t _threshold;
59 size_t _size;
60 bool _dead_samples;
61
62 // Lifecycle
63 explicit ObjectSampler(size_t size);
64 ~ObjectSampler();
65 static bool create(size_t size);
66 static bool is_created();
67 static ObjectSampler* sampler();
68 static void destroy();
69
70 // For operations that require exclusive access (non-safepoint)
71 static ObjectSampler* acquire();
72 static void release();
73
74 // Stacktrace
75 static void fill_stacktrace(JfrStackTrace* stacktrace, JavaThread* thread);
76 traceid stacktrace_id(const JfrStackTrace* stacktrace, JavaThread* thread);
77
78 // Sampling
79 static void sample(HeapWord* object, size_t size, JavaThread* thread);
80 void add(HeapWord* object, size_t size, traceid thread_id, JfrStackTrace* stacktrace, JavaThread* thread);
81 void scavenge();
82 void remove_dead(ObjectSample* sample);
83
84 // Called by GC
85 static void oops_do(BoolObjectClosure* is_alive, OopClosure* f);
86
87 const ObjectSample* item_at(int index) const;
88 ObjectSample* item_at(int index);
89 int item_count() const;
90 const ObjectSample* first() const;
91 const ObjectSample* last() const;
92 const ObjectSample* last_resolved() const;
93 void set_last_resolved(const ObjectSample* sample);
94 const JfrTicks& last_sweep() const;
95 };
96
97 #endif // SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
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