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src/share/vm/runtime/timer.hpp@fa6adc194d48 (annotated)

src/share/vm/runtime/timer.hpp

Wed, 19 Nov 2014 14:21:09 -0800

author

mchung

date

Wed, 19 Nov 2014 14:21:09 -0800

changeset 7368

fa6adc194d48

parent 5237

f2110083203d

child 6876

710a3c8b516e

permissions

-rw-r--r--

8064667: Add -XX:+CheckEndorsedAndExtDirs flag to JDK 8
Reviewed-by: coleenp, ccheung

duke@435	1	/*
sla@5237	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_TIMER_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_TIMER_HPP
stefank@2314	27
stefank@2314	28	#include "utilities/globalDefinitions.hpp"
stefank@2314	29
duke@435	30	// Timers for simple measurement.
duke@435	31
duke@435	32	class elapsedTimer VALUE_OBJ_CLASS_SPEC {
duke@435	33	friend class VMStructs;
duke@435	34	private:
duke@435	35	jlong _counter;
duke@435	36	jlong _start_counter;
duke@435	37	bool _active;
duke@435	38	public:
duke@435	39	elapsedTimer() { _active = false; reset(); }
duke@435	40	void add(elapsedTimer t);
duke@435	41	void start();
duke@435	42	void stop();
duke@435	43	void reset() { _counter = 0; }
duke@435	44	double seconds() const;
duke@435	45	jlong milliseconds() const;
duke@435	46	jlong ticks() const { return _counter; }
duke@435	47	jlong active_ticks() const;
duke@435	48	bool is_active() const { return _active; }
duke@435	49	};
duke@435	50
duke@435	51	// TimeStamp is used for recording when an event took place.
duke@435	52	class TimeStamp VALUE_OBJ_CLASS_SPEC {
duke@435	53	private:
duke@435	54	jlong _counter;
duke@435	55	public:
duke@435	56	TimeStamp() { _counter = 0; }
duke@435	57	void clear() { _counter = 0; }
duke@435	58	// has the timestamp been updated since being created or cleared?
duke@435	59	bool is_updated() const { return _counter != 0; }
duke@435	60	// update to current elapsed time
duke@435	61	void update();
duke@435	62	// update to given elapsed time
duke@435	63	void update_to(jlong ticks);
duke@435	64	// returns seconds since updated
duke@435	65	// (must not be in a cleared state: must have been previously updated)
duke@435	66	double seconds() const;
duke@435	67	jlong milliseconds() const;
duke@435	68	// ticks elapsed between VM start and last update
duke@435	69	jlong ticks() const { return _counter; }
duke@435	70	// ticks elapsed since last update
duke@435	71	jlong ticks_since_update() const;
duke@435	72	};
duke@435	73
duke@435	74	// TraceTime is used for tracing the execution time of a block
duke@435	75	// Usage:
duke@435	76	// { TraceTime t("block time")
duke@435	77	// some_code();
duke@435	78	// }
duke@435	79	//
duke@435	80
duke@435	81	class TraceTime: public StackObj {
duke@435	82	private:
duke@435	83	bool _active; // do timing
duke@435	84	bool _verbose; // report every timing
duke@435	85	elapsedTimer _t; // timer
duke@435	86	elapsedTimer* _accum; // accumulator
duke@435	87	public:
sla@5237	88	// Constructors
duke@435	89	TraceTime(const char* title,
sla@5237	90	bool doit = true);
duke@435	91	TraceTime(const char* title,
duke@435	92	elapsedTimer* accumulator,
duke@435	93	bool doit = true,
sla@5237	94	bool verbose = false);
duke@435	95	~TraceTime();
duke@435	96
duke@435	97	// Accessors
duke@435	98	void set_verbose(bool verbose) { _verbose = verbose; }
duke@435	99	bool verbose() const { return _verbose; }
duke@435	100
duke@435	101	// Activation
duke@435	102	void suspend() { if (_active) _t.stop(); }
duke@435	103	void resume() { if (_active) _t.start(); }
duke@435	104	};
duke@435	105
duke@435	106	class TraceCPUTime: public StackObj {
duke@435	107	private:
duke@435	108	bool _active; // true if times will be measured and printed
duke@435	109	bool _print_cr; // if true print carriage return at end
duke@435	110	double _starting_user_time; // user time at start of measurement
duke@435	111	double _starting_system_time; // system time at start of measurement
duke@435	112	double _starting_real_time; // real time at start of measurement
duke@435	113	outputStream* _logfile; // output is printed to this stream
duke@435	114	bool _error; // true if an error occurred, turns off output
duke@435	115
duke@435	116	public:
duke@435	117	TraceCPUTime(bool doit = true,
duke@435	118	bool print_cr = true,
duke@435	119	outputStream *logfile = NULL);
duke@435	120	~TraceCPUTime();
duke@435	121	};
stefank@2314	122
sla@5237	123	class TimeHelper {
sla@5237	124	public:
sla@5237	125	static double counter_to_seconds(jlong counter);
sla@5237	126	};
sla@5237	127
stefank@2314	128	#endif // SHARE_VM_RUNTIME_TIMER_HPP