zgu@3900: /*
zgu@3900:  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
zgu@3900:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
zgu@3900:  *
zgu@3900:  * This code is free software; you can redistribute it and/or modify it
zgu@3900:  * under the terms of the GNU General Public License version 2 only, as
zgu@3900:  * published by the Free Software Foundation.
zgu@3900:  *
zgu@3900:  * This code is distributed in the hope that it will be useful, but WITHOUT
zgu@3900:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
zgu@3900:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
zgu@3900:  * version 2 for more details (a copy is included in the LICENSE file that
zgu@3900:  * accompanied this code).
zgu@3900:  *
zgu@3900:  * You should have received a copy of the GNU General Public License version
zgu@3900:  * 2 along with this work; if not, write to the Free Software Foundation,
zgu@3900:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
zgu@3900:  *
zgu@3900:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
zgu@3900:  * or visit www.oracle.com if you need additional information or have any
zgu@3900:  * questions.
zgu@3900:  *
zgu@3900:  */
zgu@3900: 
zgu@3900: #ifndef SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
zgu@3900: #define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
zgu@3900: 
zgu@3900: #include "memory/allocation.hpp"
zgu@3900: #include "runtime/thread.hpp"
zgu@3900: #include "services/memRecorder.hpp"
zgu@3900: 
zgu@3900: // Maximum MAX_GENERATIONS generation data can be tracked.
zgu@3900: #define MAX_GENERATIONS  512
zgu@3900: 
zgu@3900: 
zgu@3900: class MemTrackWorker : public NamedThread {
zgu@3900:  private:
zgu@3900:   // circular buffer. This buffer contains recorders to be merged into global
zgu@3900:   // snaphsot.
zgu@3900:   // Each slot holds a linked list of memory recorders, that contains one
zgu@3900:   // generation of memory data.
zgu@3900:   MemRecorder*  _gen[MAX_GENERATIONS];
zgu@3900:   int           _head, _tail; // head and tail pointers to above circular buffer
zgu@3900: 
zgu@3900:   bool          _has_error;
zgu@3900: 
zgu@3900:  public:
zgu@3900:   MemTrackWorker();
zgu@3900:   ~MemTrackWorker();
zgu@3900:   _NOINLINE_ void* operator new(size_t size);
zgu@3900:   _NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant);
zgu@3900: 
zgu@3900:   void start();
zgu@3900:   void run();
zgu@3900: 
zgu@3900:   inline bool has_error() const { return _has_error; }
zgu@3900: 
zgu@3900:   // task at synchronization point
zgu@3900:   void at_sync_point(MemRecorder* pending_recorders);
zgu@3900: 
zgu@3900:   // for debugging purpose, they are not thread safe.
zgu@3900:   NOT_PRODUCT(static int count_recorder(const MemRecorder* head);)
zgu@3900:   NOT_PRODUCT(int count_pending_recorders() const;)
zgu@3900: 
zgu@3900:   NOT_PRODUCT(int _sync_point_count;)
zgu@3900:   NOT_PRODUCT(int _merge_count;)
zgu@3900:   NOT_PRODUCT(int _last_gen_in_use;)
zgu@3900: 
zgu@3900:   inline int generations_in_use() const {
zgu@3935:     return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1));
zgu@3900:   }
zgu@3900: };
zgu@3900: 
zgu@3900: #endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP