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 */ 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