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src/share/vm/services/memTrackWorker.hpp@69ad7823b1ca (annotated)

src/share/vm/services/memTrackWorker.hpp

Mon, 05 Nov 2012 15:30:22 -0500

author

zgu

date

Mon, 05 Nov 2012 15:30:22 -0500

changeset 4248

69ad7823b1ca

parent 3935

7e5976e66c62

child 4400

ecd24264898b

permissions

-rw-r--r--

8001591: NMT: assertion failed: assert(rec->addr() + rec->size() <= cur->base()) failed: Can not overlap in memSnapshot.cpp
Summary: NMT should allow overlapping committed regions as long as they belong to the same reserved region
Reviewed-by: dholmes, coleenp

zgu@3900	1	/*
zgu@3900	2	* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
zgu@3900	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
zgu@3900	4	*
zgu@3900	5	* This code is free software; you can redistribute it and/or modify it
zgu@3900	6	* under the terms of the GNU General Public License version 2 only, as
zgu@3900	7	* published by the Free Software Foundation.
zgu@3900	8	*
zgu@3900	9	* This code is distributed in the hope that it will be useful, but WITHOUT
zgu@3900	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
zgu@3900	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
zgu@3900	12	* version 2 for more details (a copy is included in the LICENSE file that
zgu@3900	13	* accompanied this code).
zgu@3900	14	*
zgu@3900	15	* You should have received a copy of the GNU General Public License version
zgu@3900	16	* 2 along with this work; if not, write to the Free Software Foundation,
zgu@3900	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
zgu@3900	18	*
zgu@3900	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
zgu@3900	20	* or visit www.oracle.com if you need additional information or have any
zgu@3900	21	* questions.
zgu@3900	22	*
zgu@3900	23	*/
zgu@3900	24
zgu@3900	25	#ifndef SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
zgu@3900	26	#define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP
zgu@3900	27
zgu@3900	28	#include "memory/allocation.hpp"
zgu@3900	29	#include "runtime/thread.hpp"
zgu@3900	30	#include "services/memRecorder.hpp"
zgu@3900	31
zgu@3900	32	// Maximum MAX_GENERATIONS generation data can be tracked.
zgu@3900	33	#define MAX_GENERATIONS 512
zgu@3900	34
zgu@3900	35
zgu@3900	36	class MemTrackWorker : public NamedThread {
zgu@3900	37	private:
zgu@3900	38	// circular buffer. This buffer contains recorders to be merged into global
zgu@3900	39	// snaphsot.
zgu@3900	40	// Each slot holds a linked list of memory recorders, that contains one
zgu@3900	41	// generation of memory data.
zgu@3900	42	MemRecorder* _gen[MAX_GENERATIONS];
zgu@3900	43	int _head, _tail; // head and tail pointers to above circular buffer
zgu@3900	44
zgu@3900	45	bool _has_error;
zgu@3900	46
zgu@3900	47	public:
zgu@3900	48	MemTrackWorker();
zgu@3900	49	~MemTrackWorker();
zgu@3900	50	_NOINLINE_ void* operator new(size_t size);
zgu@3900	51	_NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant);
zgu@3900	52
zgu@3900	53	void start();
zgu@3900	54	void run();
zgu@3900	55
zgu@3900	56	inline bool has_error() const { return _has_error; }
zgu@3900	57
zgu@3900	58	// task at synchronization point
zgu@3900	59	void at_sync_point(MemRecorder* pending_recorders);
zgu@3900	60
zgu@3900	61	// for debugging purpose, they are not thread safe.
zgu@3900	62	NOT_PRODUCT(static int count_recorder(const MemRecorder* head);)
zgu@3900	63	NOT_PRODUCT(int count_pending_recorders() const;)
zgu@3900	64
zgu@3900	65	NOT_PRODUCT(int _sync_point_count;)
zgu@3900	66	NOT_PRODUCT(int _merge_count;)
zgu@3900	67	NOT_PRODUCT(int _last_gen_in_use;)
zgu@3900	68
zgu@3900	69	inline int generations_in_use() const {
zgu@3935	70	return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1));
zgu@3900	71	}
zgu@3900	72	};
zgu@3900	73
zgu@3900	74	#endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP