sim_events.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 160 行

/*
 * Copyright (c) 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Nathan L. Binkert
 */

#include <string>

#include "base/callback.hh"
#include "base/hostinfo.hh"
#include "sim/eventq.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/startup.hh"
#include "sim/stats.hh"

using namespace std;

//
// handle termination event
//
void
SimLoopExitEvent::process()
{
    // if this got scheduled on a different queue (e.g. the committed
    // instruction queue) then make a corresponding event on the main
    // queue.
    if (theQueue() != &mainEventQueue) {
        exitSimLoop(cause, code);
        delete this;
    }

    // otherwise do nothing... the IsExitEvent flag takes care of
    // exiting the simulation loop and returning this object to Python

    // but if you are doing this on intervals, don't forget to make another
    if (repeat) {
        schedule(curTick + repeat);
    }
}


const char *
SimLoopExitEvent::description() const
{
    return "simulation loop exit";
}

SimLoopExitEvent *
schedExitSimLoop(const std::string &message, Tick when, Tick repeat,
                 EventQueue *q, int exit_code)
{
    if (q == NULL)
        q = &mainEventQueue;

    return new SimLoopExitEvent(q, when, repeat, message, exit_code);
}

void
exitSimLoop(const std::string &message, int exit_code)
{
    schedExitSimLoop(message, curTick, 0, NULL, exit_code);
}

void
CountedDrainEvent::process()
{
    if (--count == 0) {
        exitSimLoop("Finished drain");
    }
}

//
// constructor: automatically schedules at specified time
//
CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
                                   Tick _when, int &_downCounter)
    : Event(q, Sim_Exit_Pri),
      cause(_cause),
      downCounter(_downCounter)
{
    // catch stupid mistakes
    assert(downCounter > 0);

    schedule(_when);
}


//
// handle termination event
//
void
CountedExitEvent::process()
{
    if (--downCounter == 0) {
        exitSimLoop(cause, 0);
    }
}


const char *
CountedExitEvent::description() const
{
    return "counted exit";
}

#ifdef CHECK_SWAP_CYCLES
new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
#endif

void
CheckSwapEvent::process()
{
    /*  Check the amount of free swap space  */
    long swap;

    /*  returns free swap in KBytes  */
    swap = procInfo("/proc/meminfo", "SwapFree:");

    if (swap < 1000)
        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);

    if (swap < 100) {
        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
        exitSimLoop("Lack of swap space");
    }

    schedule(curTick + interval);
}

const char *
CheckSwapEvent::description() const
{
    return "check swap";
}