stats.h

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#ifndef STATS_H
#define STATS_H

#include "copyright.h"


class Statistics {
  public:
  // LB: type of ticks promoted from 32 bit int to 64 bit long long
  // to cope with long runs
  // int totalTicks;        // Total time running Nachos
  // int idleTicks;         // Time spent idle (no threads to run)
  // int systemTicks;       // Time spent executing system code
  // int userTicks;         // Time spent executing user code
                // (this is also equal to # of
                // user instructions executed)
  long long totalTicks;         // Total time running Nachos
  long long idleTicks;          // Time spent idle (no threads to run)
  long long systemTicks;    // Time spent executing system code
  long long userTicks;          // Time spent executing user code
                // (this is also equal to # of
                // user instructions executed)
  // End of correction


    int numDiskReads;       // number of disk read requests
    int numDiskWrites;      // number of disk write requests
    int numConsoleCharsRead;    // number of characters read from the keyboard
    int numConsoleCharsWritten; // number of characters written to the display
    int numPageFaults;      // number of virtual memory page faults
    int numPacketsSent;     // number of packets sent over the network
    int numPacketsRecvd;    // number of packets received over the network

    Statistics();       // initialize everything to zero

    void Print();       // print collected statistics
};

// Constants used to reflect the relative time an operation would
// take in a real system.  A "tick" is a just a unit of time -- if you 
// like, a microsecond.
//
// Since Nachos kernel code is directly executed, and the time spent
// in the kernel measured by the number of calls to enable interrupts,
// these time constants are none too exact.

#define UserTick    1   // advance for each user-level instruction 
#define SystemTick  10  // advance each time interrupts are enabled
#define RotationTime    500     // time disk takes to rotate one sector
#define SeekTime    500     // time disk takes to seek past one track
#define ConsoleTime     100 // time to read or write one character
#define NetworkTime     100     // time to send or receive one packet
#define TimerTicks  100     // (average) time between timer interrupts

#endif // STATS_H