apetushkov@9858: /*
apetushkov@9858:  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
apetushkov@9858:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
apetushkov@9858:  *
apetushkov@9858:  * This code is free software; you can redistribute it and/or modify it
apetushkov@9858:  * under the terms of the GNU General Public License version 2 only, as
apetushkov@9858:  * published by the Free Software Foundation.
apetushkov@9858:  *
apetushkov@9858:  * This code is distributed in the hope that it will be useful, but WITHOUT
apetushkov@9858:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
apetushkov@9858:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
apetushkov@9858:  * version 2 for more details (a copy is included in the LICENSE file that
apetushkov@9858:  * accompanied this code).
apetushkov@9858:  *
apetushkov@9858:  * You should have received a copy of the GNU General Public License version
apetushkov@9858:  * 2 along with this work; if not, write to the Free Software Foundation,
apetushkov@9858:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
apetushkov@9858:  *
apetushkov@9858:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
apetushkov@9858:  * or visit www.oracle.com if you need additional information or have any
apetushkov@9858:  * questions.
apetushkov@9858:  *
apetushkov@9858:  */
apetushkov@9858: 
apetushkov@9858: #ifndef SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
apetushkov@9858: #define SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP
apetushkov@9858: 
apetushkov@9858: #include "memory/allocation.hpp"
apetushkov@9858: #include "jfr/utilities/jfrTime.hpp"
apetushkov@9858: 
ddong@9885: typedef u8 traceid;
ddong@9885: 
apetushkov@9858: class BoolObjectClosure;
ddong@9885: class JfrStackTrace;
apetushkov@9858: class OopClosure;
apetushkov@9858: class ObjectSample;
apetushkov@9858: class ObjectSampler;
apetushkov@9858: class SampleList;
apetushkov@9858: class SamplePriorityQueue;
apetushkov@9858: class Thread;
apetushkov@9858: 
apetushkov@9858: // Class reponsible for holding samples and
apetushkov@9858: // making sure the samples are evenly distributed as
apetushkov@9858: // new entries are added and removed.
apetushkov@9858: class ObjectSampler : public CHeapObj<mtTracing> {
ddong@9885:   friend class EventEmitter;
ddong@9885:   friend class JfrRecorderService;
apetushkov@9858:   friend class LeakProfiler;
apetushkov@9858:   friend class StartOperation;
apetushkov@9858:   friend class StopOperation;
ddong@9885:   friend class ObjectSampleCheckpoint;
ddong@9885:   friend class WriteObjectSampleStacktrace;
apetushkov@9858:  private:
apetushkov@9858:   SamplePriorityQueue* _priority_queue;
apetushkov@9858:   SampleList* _list;
apetushkov@9858:   JfrTicks _last_sweep;
apetushkov@9858:   size_t _total_allocated;
apetushkov@9858:   size_t _threshold;
apetushkov@9858:   size_t _size;
apetushkov@9858:   bool _dead_samples;
apetushkov@9858: 
ddong@9885:   // Lifecycle
apetushkov@9858:   explicit ObjectSampler(size_t size);
apetushkov@9858:   ~ObjectSampler();
ddong@9885:   static bool create(size_t size);
ddong@9885:   static bool is_created();
ddong@9885:   static ObjectSampler* sampler();
ddong@9885:   static void destroy();
apetushkov@9858: 
ddong@9885:   // For operations that require exclusive access (non-safepoint)
ddong@9885:   static ObjectSampler* acquire();
ddong@9885:   static void release();
ddong@9885: 
ddong@9885:   // Stacktrace
ddong@9885:   static void fill_stacktrace(JfrStackTrace* stacktrace, JavaThread* thread);
ddong@9885:   traceid stacktrace_id(const JfrStackTrace* stacktrace, JavaThread* thread);
ddong@9885: 
ddong@9885:   // Sampling
ddong@9885:   static void sample(HeapWord* object, size_t size, JavaThread* thread);
ddong@9885:   void add(HeapWord* object, size_t size, traceid thread_id, JfrStackTrace* stacktrace, JavaThread* thread);
ddong@9885:   void scavenge();
apetushkov@9858:   void remove_dead(ObjectSample* sample);
apetushkov@9858: 
apetushkov@9858:   // Called by GC
ddong@9885:   static void oops_do(BoolObjectClosure* is_alive, OopClosure* f);
apetushkov@9858: 
apetushkov@9858:   const ObjectSample* item_at(int index) const;
apetushkov@9858:   ObjectSample* item_at(int index);
apetushkov@9858:   int item_count() const;
egahlin@9867:   const ObjectSample* first() const;
apetushkov@9858:   const ObjectSample* last() const;
apetushkov@9858:   const ObjectSample* last_resolved() const;
apetushkov@9858:   void set_last_resolved(const ObjectSample* sample);
apetushkov@9858:   const JfrTicks& last_sweep() const;
apetushkov@9858: };
apetushkov@9858: 
apetushkov@9858: #endif // SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP