rev 7854 : imported patch 8027962-per-phase-timing-measurements-for-strong-roots-processing
rev 7855 : [mq]: 8027962-bengt-suggestions

   1 /*
   2  * Copyright (c) 1997, 2015, 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 PhaseTimeData : public StackObj {
 107 public:
 108   virtual bool active() const = 0;
 109   virtual void set_value(uint phase, double value) = 0;
 110 };
 111 
 112 class TrackPhaseTime : public StackObj {
 113  private:
 114   PhaseTimeData* _data;
 115   uint           _phase;
 116   jlong          _last;
 117  public:
 118   // Constructors
 119   TrackPhaseTime(PhaseTimeData *data, uint phase);
 120   ~TrackPhaseTime();
 121 };
 122 
 123 class TraceCPUTime: public StackObj {
 124  private:
 125   bool _active;                 // true if times will be measured and printed
 126   bool _print_cr;               // if true print carriage return at end
 127   double _starting_user_time;   // user time at start of measurement
 128   double _starting_system_time; // system time at start of measurement
 129   double _starting_real_time;   // real time at start of measurement
 130   outputStream* _logfile;       // output is printed to this stream
 131   bool _error;                  // true if an error occurred, turns off output
 132 
 133  public:
 134   TraceCPUTime(bool doit = true,
 135                bool print_cr = true,
 136                outputStream *logfile = NULL);
 137   ~TraceCPUTime();
 138 };
 139 
 140 class TimeHelper {
 141  public:
 142   static double counter_to_seconds(jlong counter);
 143 };
 144 
 145 #endif // SHARE_VM_RUNTIME_TIMER_HPP
--- EOF ---