rev 7854 : imported patch 8027962-per-phase-timing-measurements-for-strong-roots-processing
rev 7855 : [mq]: 8027962-bengt-suggestions
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_TIMER_HPP
26 #define SHARE_VM_RUNTIME_TIMER_HPP
27
28 #include "utilities/globalDefinitions.hpp"
29
30 // Timers for simple measurement.
31
32 class elapsedTimer VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 private:
35 jlong _counter;
36 jlong _start_counter;
37 bool _active;
38 public:
39 elapsedTimer() { _active = false; reset(); }
40 void add(elapsedTimer t);
41 void start();
42 void stop();
43 void reset() { _counter = 0; }
44 double seconds() const;
45 jlong milliseconds() const;
46 jlong ticks() const { return _counter; }
47 jlong active_ticks() const;
48 bool is_active() const { return _active; }
49 };
50
51 // TimeStamp is used for recording when an event took place.
52 class TimeStamp VALUE_OBJ_CLASS_SPEC {
53 private:
54 jlong _counter;
55 public:
56 TimeStamp() { _counter = 0; }
57 void clear() { _counter = 0; }
58 // has the timestamp been updated since being created or cleared?
59 bool is_updated() const { return _counter != 0; }
60 // update to current elapsed time
61 void update();
62 // update to given elapsed time
63 void update_to(jlong ticks);
64 // returns seconds since updated
65 // (must not be in a cleared state: must have been previously updated)
66 double seconds() const;
67 jlong milliseconds() const;
68 // ticks elapsed between VM start and last update
69 jlong ticks() const { return _counter; }
70 // ticks elapsed since last update
71 jlong ticks_since_update() const;
72 };
73
74 // TraceTime is used for tracing the execution time of a block
75 // Usage:
76 // { TraceTime t("block time")
77 // some_code();
78 // }
79 //
80
81 class TraceTime: public StackObj {
82 private:
83 bool _active; // do timing
84 bool _verbose; // report every timing
85 elapsedTimer _t; // timer
86 elapsedTimer* _accum; // accumulator
87 public:
88 // Constructors
89 TraceTime(const char* title,
90 bool doit = true);
91 TraceTime(const char* title,
92 elapsedTimer* accumulator,
93 bool doit = true,
94 bool verbose = false);
95 ~TraceTime();
96
97 // Accessors
98 void set_verbose(bool verbose) { _verbose = verbose; }
99 bool verbose() const { return _verbose; }
100
101 // Activation
102 void suspend() { if (_active) _t.stop(); }
103 void resume() { if (_active) _t.start(); }
104 };
105
106 class TraceCPUTime: public StackObj {
107 private:
108 bool _active; // true if times will be measured and printed
109 bool _print_cr; // if true print carriage return at end
110 double _starting_user_time; // user time at start of measurement
111 double _starting_system_time; // system time at start of measurement
112 double _starting_real_time; // real time at start of measurement
113 outputStream* _logfile; // output is printed to this stream
114 bool _error; // true if an error occurred, turns off output
115
116 public:
117 TraceCPUTime(bool doit = true,
118 bool print_cr = true,
119 outputStream *logfile = NULL);
120 ~TraceCPUTime();
121 };
122
123 class TimeHelper {
124 public:
125 static double counter_to_seconds(jlong counter);
126 };
127
128 #endif // SHARE_VM_RUNTIME_TIMER_HPP
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