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f9083712dd
1) Fixed MemTrackWorker::generations_in_used() calculation 2) Ensured NMT not to leak memory recorders after shutdown 3) Used ThreadCritical to block safepoint safe threads Reviewed-by: acorn, coleenp, dholmes, kvn
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
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#define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
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#include "memory/allocation.hpp"
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#include "runtime/thread.hpp"
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#include "services/memRecorder.hpp"
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// Maximum MAX_GENERATIONS generation data can be tracked.
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#define MAX_GENERATIONS 512
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class MemTrackWorker : public NamedThread {
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private:
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// circular buffer. This buffer contains recorders to be merged into global
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// snaphsot.
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// Each slot holds a linked list of memory recorders, that contains one
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// generation of memory data.
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MemRecorder* _gen[MAX_GENERATIONS];
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int _head, _tail; // head and tail pointers to above circular buffer
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bool _has_error;
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public:
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MemTrackWorker();
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~MemTrackWorker();
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_NOINLINE_ void* operator new(size_t size);
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_NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant);
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void start();
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void run();
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inline bool has_error() const { return _has_error; }
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// task at synchronization point
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void at_sync_point(MemRecorder* pending_recorders);
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// for debugging purpose, they are not thread safe.
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NOT_PRODUCT(static int count_recorder(const MemRecorder* head);)
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NOT_PRODUCT(int count_pending_recorders() const;)
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NOT_PRODUCT(int _sync_point_count;)
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NOT_PRODUCT(int _merge_count;)
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NOT_PRODUCT(int _last_gen_in_use;)
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inline int generations_in_use() const {
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return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1));
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}
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};
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#endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
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