Mon, 12 Aug 2019 18:30:40 +0300
8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens
1 /*
2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 */
25 #ifndef SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
26 #define SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
28 #include "memory/allocation.hpp"
29 #include "jfr/utilities/jfrTime.hpp"
31 class BoolObjectClosure;
32 class OopClosure;
33 class ObjectSample;
34 class ObjectSampler;
35 class SampleList;
36 class SamplePriorityQueue;
37 class Thread;
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;
58 explicit ObjectSampler(size_t size);
59 ~ObjectSampler();
61 void add(HeapWord* object, size_t size, JavaThread* thread);
62 void remove_dead(ObjectSample* sample);
63 void scavenge();
65 // Called by GC
66 void oops_do(BoolObjectClosure* is_alive, OopClosure* f);
68 public:
69 const ObjectSample* item_at(int index) const;
70 ObjectSample* item_at(int index);
71 int item_count() const;
72 const ObjectSample* last() const;
73 const ObjectSample* last_resolved() const;
74 void set_last_resolved(const ObjectSample* sample);
75 const JfrTicks& last_sweep() const;
76 };
78 #endif // SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP