scheduler.cc revision 13180
112953Sgabeblack@google.com/* 212953Sgabeblack@google.com * Copyright 2018 Google, Inc. 312953Sgabeblack@google.com * 412953Sgabeblack@google.com * Redistribution and use in source and binary forms, with or without 512953Sgabeblack@google.com * modification, are permitted provided that the following conditions are 612953Sgabeblack@google.com * met: redistributions of source code must retain the above copyright 712953Sgabeblack@google.com * notice, this list of conditions and the following disclaimer; 812953Sgabeblack@google.com * redistributions in binary form must reproduce the above copyright 912953Sgabeblack@google.com * notice, this list of conditions and the following disclaimer in the 1012953Sgabeblack@google.com * documentation and/or other materials provided with the distribution; 1112953Sgabeblack@google.com * neither the name of the copyright holders nor the names of its 1212953Sgabeblack@google.com * contributors may be used to endorse or promote products derived from 1312953Sgabeblack@google.com * this software without specific prior written permission. 1412953Sgabeblack@google.com * 1512953Sgabeblack@google.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1612953Sgabeblack@google.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1712953Sgabeblack@google.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1812953Sgabeblack@google.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 1912953Sgabeblack@google.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2012953Sgabeblack@google.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2112953Sgabeblack@google.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2212953Sgabeblack@google.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2312953Sgabeblack@google.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2412953Sgabeblack@google.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2512953Sgabeblack@google.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2612953Sgabeblack@google.com * 2712953Sgabeblack@google.com * Authors: Gabe Black 2812953Sgabeblack@google.com */ 2912953Sgabeblack@google.com 3012953Sgabeblack@google.com#include "systemc/core/scheduler.hh" 3112953Sgabeblack@google.com 3212953Sgabeblack@google.com#include "base/fiber.hh" 3312954Sgabeblack@google.com#include "base/logging.hh" 3412954Sgabeblack@google.com#include "sim/eventq.hh" 3512982Sgabeblack@google.com#include "systemc/core/kernel.hh" 3612982Sgabeblack@google.com#include "systemc/ext/core/sc_main.hh" 3712953Sgabeblack@google.com 3812953Sgabeblack@google.comnamespace sc_gem5 3912953Sgabeblack@google.com{ 4012953Sgabeblack@google.com 4112954Sgabeblack@google.comScheduler::Scheduler() : 4212962Sgabeblack@google.com eq(nullptr), readyEvent(this, false, ReadyPriority), 4312961Sgabeblack@google.com pauseEvent(this, false, PausePriority), 4412961Sgabeblack@google.com stopEvent(this, false, StopPriority), 4512987Sgabeblack@google.com scMain(nullptr), 4612987Sgabeblack@google.com starvationEvent(this, false, StarvationPriority), 4713154Sgabeblack@google.com _started(false), _paused(false), _stopped(false), _stopNow(false), 4812961Sgabeblack@google.com maxTickEvent(this, false, MaxTickPriority), 4913140Sgabeblack@google.com _numCycles(0), _changeStamp(0), _current(nullptr), initDone(false), 5013176Sgabeblack@google.com runOnce(false), readyList(nullptr) 5112954Sgabeblack@google.com{} 5212953Sgabeblack@google.com 5313072Sgabeblack@google.comScheduler::~Scheduler() 5413072Sgabeblack@google.com{ 5513072Sgabeblack@google.com // Clear out everything that belongs to us to make sure nobody tries to 5613072Sgabeblack@google.com // clear themselves out after the scheduler goes away. 5713076Sgabeblack@google.com clear(); 5813076Sgabeblack@google.com} 5913072Sgabeblack@google.com 6013076Sgabeblack@google.comvoid 6113076Sgabeblack@google.comScheduler::clear() 6213076Sgabeblack@google.com{ 6313072Sgabeblack@google.com // Delta notifications. 6413144Sgabeblack@google.com while (!deltas.empty()) 6513144Sgabeblack@google.com deltas.front()->deschedule(); 6613072Sgabeblack@google.com 6713072Sgabeblack@google.com // Timed notifications. 6813076Sgabeblack@google.com for (auto &tsp: timeSlots) { 6913076Sgabeblack@google.com TimeSlot *&ts = tsp.second; 7013144Sgabeblack@google.com while (!ts->events.empty()) 7113144Sgabeblack@google.com ts->events.front()->deschedule(); 7213088Sgabeblack@google.com deschedule(ts); 7313072Sgabeblack@google.com } 7413076Sgabeblack@google.com timeSlots.clear(); 7513072Sgabeblack@google.com 7613072Sgabeblack@google.com // gem5 events. 7713072Sgabeblack@google.com if (readyEvent.scheduled()) 7813088Sgabeblack@google.com deschedule(&readyEvent); 7913072Sgabeblack@google.com if (pauseEvent.scheduled()) 8013088Sgabeblack@google.com deschedule(&pauseEvent); 8113072Sgabeblack@google.com if (stopEvent.scheduled()) 8213088Sgabeblack@google.com deschedule(&stopEvent); 8313072Sgabeblack@google.com if (starvationEvent.scheduled()) 8413088Sgabeblack@google.com deschedule(&starvationEvent); 8513072Sgabeblack@google.com if (maxTickEvent.scheduled()) 8613088Sgabeblack@google.com deschedule(&maxTickEvent); 8713072Sgabeblack@google.com 8813072Sgabeblack@google.com Process *p; 8913072Sgabeblack@google.com while ((p = toFinalize.getNext())) 9013072Sgabeblack@google.com p->popListNode(); 9113072Sgabeblack@google.com while ((p = initList.getNext())) 9213072Sgabeblack@google.com p->popListNode(); 9313176Sgabeblack@google.com while ((p = readyListMethods.getNext())) 9413176Sgabeblack@google.com p->popListNode(); 9513176Sgabeblack@google.com while ((p = readyListThreads.getNext())) 9613072Sgabeblack@google.com p->popListNode(); 9713072Sgabeblack@google.com 9813072Sgabeblack@google.com Channel *c; 9913072Sgabeblack@google.com while ((c = updateList.getNext())) 10013072Sgabeblack@google.com c->popListNode(); 10113072Sgabeblack@google.com} 10213072Sgabeblack@google.com 10312953Sgabeblack@google.comvoid 10413067Sgabeblack@google.comScheduler::initPhase() 10512953Sgabeblack@google.com{ 10612957Sgabeblack@google.com for (Process *p = toFinalize.getNext(); p; p = toFinalize.getNext()) { 10712957Sgabeblack@google.com p->finalize(); 10812957Sgabeblack@google.com p->popListNode(); 10913180Sgabeblack@google.com 11013180Sgabeblack@google.com if (!p->hasStaticSensitivities() && !p->internal()) { 11113180Sgabeblack@google.com SC_REPORT_WARNING( 11213180Sgabeblack@google.com "(W558) disable() or dont_initialize() called on process " 11313180Sgabeblack@google.com "with no static sensitivity, it will be orphaned", 11413180Sgabeblack@google.com p->name()); 11513180Sgabeblack@google.com } 11612957Sgabeblack@google.com } 11712957Sgabeblack@google.com 11812957Sgabeblack@google.com for (Process *p = initList.getNext(); p; p = initList.getNext()) { 11912957Sgabeblack@google.com p->finalize(); 12012996Sgabeblack@google.com p->popListNode(); 12112959Sgabeblack@google.com p->ready(); 12212957Sgabeblack@google.com } 12312957Sgabeblack@google.com 12413067Sgabeblack@google.com update(); 12513067Sgabeblack@google.com 12613144Sgabeblack@google.com while (!deltas.empty()) 12713144Sgabeblack@google.com deltas.front()->run(); 12813067Sgabeblack@google.com 12912985Sgabeblack@google.com for (auto ets: eventsToSchedule) 13012985Sgabeblack@google.com eq->schedule(ets.first, ets.second); 13112985Sgabeblack@google.com eventsToSchedule.clear(); 13212985Sgabeblack@google.com 13313068Sgabeblack@google.com if (_started) { 13413096Sgabeblack@google.com if (!runToTime && starved()) 13513068Sgabeblack@google.com scheduleStarvationEvent(); 13613069Sgabeblack@google.com kernel->status(::sc_core::SC_RUNNING); 13713068Sgabeblack@google.com } 13812961Sgabeblack@google.com 13913067Sgabeblack@google.com initDone = true; 14012957Sgabeblack@google.com} 14112957Sgabeblack@google.com 14212957Sgabeblack@google.comvoid 14312957Sgabeblack@google.comScheduler::reg(Process *p) 14412957Sgabeblack@google.com{ 14513067Sgabeblack@google.com if (initDone) { 14612957Sgabeblack@google.com // If we're past initialization, finalize static sensitivity. 14712957Sgabeblack@google.com p->finalize(); 14812957Sgabeblack@google.com // Mark the process as ready. 14912959Sgabeblack@google.com p->ready(); 15012957Sgabeblack@google.com } else { 15112957Sgabeblack@google.com // Otherwise, record that this process should be initialized once we 15212957Sgabeblack@google.com // get there. 15312957Sgabeblack@google.com initList.pushLast(p); 15412957Sgabeblack@google.com } 15512957Sgabeblack@google.com} 15612957Sgabeblack@google.com 15712957Sgabeblack@google.comvoid 15812957Sgabeblack@google.comScheduler::dontInitialize(Process *p) 15912957Sgabeblack@google.com{ 16013067Sgabeblack@google.com if (initDone) { 16112957Sgabeblack@google.com // Pop this process off of the ready list. 16212957Sgabeblack@google.com p->popListNode(); 16312957Sgabeblack@google.com } else { 16412957Sgabeblack@google.com // Push this process onto the list of processes which still need 16512957Sgabeblack@google.com // their static sensitivity to be finalized. That implicitly pops it 16612957Sgabeblack@google.com // off the list of processes to be initialized/marked ready. 16712957Sgabeblack@google.com toFinalize.pushLast(p); 16812957Sgabeblack@google.com } 16912953Sgabeblack@google.com} 17012953Sgabeblack@google.com 17112953Sgabeblack@google.comvoid 17212953Sgabeblack@google.comScheduler::yield() 17312953Sgabeblack@google.com{ 17413176Sgabeblack@google.com // Pull a process from the active list. 17513176Sgabeblack@google.com _current = readyList->getNext(); 17612953Sgabeblack@google.com if (!_current) { 17712953Sgabeblack@google.com // There are no more processes, so return control to evaluate. 17812953Sgabeblack@google.com Fiber::primaryFiber()->run(); 17912953Sgabeblack@google.com } else { 18012953Sgabeblack@google.com _current->popListNode(); 18112953Sgabeblack@google.com // Switch to whatever Fiber is supposed to run this process. All 18212953Sgabeblack@google.com // Fibers which aren't running should be parked at this line. 18312953Sgabeblack@google.com _current->fiber()->run(); 18412961Sgabeblack@google.com // If the current process needs to be manually started, start it. 18513093Sgabeblack@google.com if (_current && _current->needsStart()) { 18613093Sgabeblack@google.com _current->needsStart(false); 18712953Sgabeblack@google.com _current->run(); 18813093Sgabeblack@google.com } 18912953Sgabeblack@google.com } 19012995Sgabeblack@google.com if (_current && _current->excWrapper) { 19112995Sgabeblack@google.com // Make sure this isn't a method process. 19212995Sgabeblack@google.com assert(!_current->needsStart()); 19312995Sgabeblack@google.com auto ew = _current->excWrapper; 19412995Sgabeblack@google.com _current->excWrapper = nullptr; 19512995Sgabeblack@google.com ew->throw_it(); 19612995Sgabeblack@google.com } 19712953Sgabeblack@google.com} 19812953Sgabeblack@google.com 19912953Sgabeblack@google.comvoid 20012954Sgabeblack@google.comScheduler::ready(Process *p) 20112953Sgabeblack@google.com{ 20213154Sgabeblack@google.com if (_stopNow) 20313154Sgabeblack@google.com return; 20413154Sgabeblack@google.com 20513176Sgabeblack@google.com if (p->procKind() == ::sc_core::SC_METHOD_PROC_) 20613176Sgabeblack@google.com readyListMethods.pushLast(p); 20712954Sgabeblack@google.com else 20813176Sgabeblack@google.com readyListThreads.pushLast(p); 20912953Sgabeblack@google.com 21012954Sgabeblack@google.com scheduleReadyEvent(); 21112954Sgabeblack@google.com} 21212954Sgabeblack@google.com 21312954Sgabeblack@google.comvoid 21413133Sgabeblack@google.comScheduler::resume(Process *p) 21513133Sgabeblack@google.com{ 21613133Sgabeblack@google.com if (initDone) 21713133Sgabeblack@google.com ready(p); 21813133Sgabeblack@google.com else 21913133Sgabeblack@google.com initList.pushLast(p); 22013133Sgabeblack@google.com} 22113133Sgabeblack@google.com 22213133Sgabeblack@google.combool 22313176Sgabeblack@google.comlistContains(ListNode *list, ListNode *target) 22413176Sgabeblack@google.com{ 22513176Sgabeblack@google.com ListNode *n = list->nextListNode; 22613176Sgabeblack@google.com while (n != list) 22713176Sgabeblack@google.com if (n == target) 22813176Sgabeblack@google.com return true; 22913176Sgabeblack@google.com return false; 23013176Sgabeblack@google.com} 23113176Sgabeblack@google.com 23213176Sgabeblack@google.combool 23313133Sgabeblack@google.comScheduler::suspend(Process *p) 23413133Sgabeblack@google.com{ 23513176Sgabeblack@google.com bool was_ready; 23613133Sgabeblack@google.com if (initDone) { 23713133Sgabeblack@google.com // After initialization, the only list we can be on is the ready list. 23813176Sgabeblack@google.com was_ready = (p->nextListNode != nullptr); 23913133Sgabeblack@google.com p->popListNode(); 24013133Sgabeblack@google.com } else { 24113176Sgabeblack@google.com // Check the ready lists to see if we find this process. 24213176Sgabeblack@google.com was_ready = listContains(&readyListMethods, p) || 24313176Sgabeblack@google.com listContains(&readyListThreads, p); 24413133Sgabeblack@google.com if (was_ready) 24513133Sgabeblack@google.com toFinalize.pushLast(p); 24613133Sgabeblack@google.com } 24713176Sgabeblack@google.com return was_ready; 24813133Sgabeblack@google.com} 24913133Sgabeblack@google.com 25013133Sgabeblack@google.comvoid 25112954Sgabeblack@google.comScheduler::requestUpdate(Channel *c) 25212954Sgabeblack@google.com{ 25312954Sgabeblack@google.com updateList.pushLast(c); 25413069Sgabeblack@google.com scheduleReadyEvent(); 25512954Sgabeblack@google.com} 25612954Sgabeblack@google.com 25712954Sgabeblack@google.comvoid 25812954Sgabeblack@google.comScheduler::scheduleReadyEvent() 25912954Sgabeblack@google.com{ 26012954Sgabeblack@google.com // Schedule the evaluate and update phases. 26112954Sgabeblack@google.com if (!readyEvent.scheduled()) { 26213069Sgabeblack@google.com schedule(&readyEvent); 26312987Sgabeblack@google.com if (starvationEvent.scheduled()) 26413069Sgabeblack@google.com deschedule(&starvationEvent); 26512987Sgabeblack@google.com } 26612987Sgabeblack@google.com} 26712987Sgabeblack@google.com 26812987Sgabeblack@google.comvoid 26912987Sgabeblack@google.comScheduler::scheduleStarvationEvent() 27012987Sgabeblack@google.com{ 27112987Sgabeblack@google.com if (!starvationEvent.scheduled()) { 27213069Sgabeblack@google.com schedule(&starvationEvent); 27312987Sgabeblack@google.com if (readyEvent.scheduled()) 27413069Sgabeblack@google.com deschedule(&readyEvent); 27512954Sgabeblack@google.com } 27612954Sgabeblack@google.com} 27712954Sgabeblack@google.com 27812954Sgabeblack@google.comvoid 27912954Sgabeblack@google.comScheduler::runReady() 28012954Sgabeblack@google.com{ 28113176Sgabeblack@google.com bool empty = readyListMethods.empty() && readyListThreads.empty(); 28213140Sgabeblack@google.com lastReadyTick = getCurTick(); 28312954Sgabeblack@google.com 28412954Sgabeblack@google.com // The evaluation phase. 28512953Sgabeblack@google.com do { 28613176Sgabeblack@google.com // We run methods and threads in two seperate passes to emulate how 28713176Sgabeblack@google.com // Accellera orders things, but without having to scan through a 28813176Sgabeblack@google.com // unified list to find the next process of the correct type. 28913176Sgabeblack@google.com readyList = &readyListMethods; 29013176Sgabeblack@google.com while (!readyListMethods.empty()) 29113176Sgabeblack@google.com yield(); 29213176Sgabeblack@google.com 29313176Sgabeblack@google.com readyList = &readyListThreads; 29413176Sgabeblack@google.com while (!readyListThreads.empty()) 29513176Sgabeblack@google.com yield(); 29613176Sgabeblack@google.com 29713176Sgabeblack@google.com // We already know that readyListThreads is empty at this point. 29813176Sgabeblack@google.com } while (!readyListMethods.empty()); 29912954Sgabeblack@google.com 30013140Sgabeblack@google.com if (!empty) { 30112954Sgabeblack@google.com _numCycles++; 30213140Sgabeblack@google.com _changeStamp++; 30313140Sgabeblack@google.com } 30412954Sgabeblack@google.com 30513154Sgabeblack@google.com if (_stopNow) 30613154Sgabeblack@google.com return; 30713154Sgabeblack@google.com 30812954Sgabeblack@google.com // The update phase. 30912954Sgabeblack@google.com update(); 31012954Sgabeblack@google.com 31113063Sgabeblack@google.com // The delta phase. 31213144Sgabeblack@google.com while (!deltas.empty()) 31313144Sgabeblack@google.com deltas.front()->run(); 31413061Sgabeblack@google.com 31513096Sgabeblack@google.com if (!runToTime && starved()) 31613096Sgabeblack@google.com scheduleStarvationEvent(); 31713096Sgabeblack@google.com 31813064Sgabeblack@google.com if (runOnce) 31913064Sgabeblack@google.com schedulePause(); 32012953Sgabeblack@google.com} 32112953Sgabeblack@google.com 32212953Sgabeblack@google.comvoid 32312953Sgabeblack@google.comScheduler::update() 32412953Sgabeblack@google.com{ 32512954Sgabeblack@google.com Channel *channel = updateList.getNext(); 32612954Sgabeblack@google.com while (channel) { 32712954Sgabeblack@google.com channel->popListNode(); 32812954Sgabeblack@google.com channel->update(); 32912954Sgabeblack@google.com channel = updateList.getNext(); 33012954Sgabeblack@google.com } 33112953Sgabeblack@google.com} 33212953Sgabeblack@google.com 33312961Sgabeblack@google.comvoid 33412961Sgabeblack@google.comScheduler::pause() 33512961Sgabeblack@google.com{ 33612961Sgabeblack@google.com _paused = true; 33712982Sgabeblack@google.com kernel->status(::sc_core::SC_PAUSED); 33813061Sgabeblack@google.com runOnce = false; 33912961Sgabeblack@google.com scMain->run(); 34012961Sgabeblack@google.com} 34112961Sgabeblack@google.com 34212961Sgabeblack@google.comvoid 34312961Sgabeblack@google.comScheduler::stop() 34412961Sgabeblack@google.com{ 34512961Sgabeblack@google.com _stopped = true; 34612982Sgabeblack@google.com kernel->stop(); 34713074Sgabeblack@google.com 34813076Sgabeblack@google.com clear(); 34913074Sgabeblack@google.com 35013061Sgabeblack@google.com runOnce = false; 35112961Sgabeblack@google.com scMain->run(); 35212961Sgabeblack@google.com} 35312961Sgabeblack@google.com 35412961Sgabeblack@google.comvoid 35512961Sgabeblack@google.comScheduler::start(Tick max_tick, bool run_to_time) 35612961Sgabeblack@google.com{ 35712961Sgabeblack@google.com // We should be running from sc_main. Keep track of that Fiber to return 35812961Sgabeblack@google.com // to later. 35912961Sgabeblack@google.com scMain = Fiber::currentFiber(); 36012961Sgabeblack@google.com 36112961Sgabeblack@google.com _started = true; 36212961Sgabeblack@google.com _paused = false; 36312961Sgabeblack@google.com _stopped = false; 36412987Sgabeblack@google.com runToTime = run_to_time; 36512961Sgabeblack@google.com 36612961Sgabeblack@google.com maxTick = max_tick; 36713140Sgabeblack@google.com lastReadyTick = getCurTick(); 36812961Sgabeblack@google.com 36913067Sgabeblack@google.com if (initDone) { 37013096Sgabeblack@google.com if (!runToTime && starved()) 37113068Sgabeblack@google.com scheduleStarvationEvent(); 37212982Sgabeblack@google.com kernel->status(::sc_core::SC_RUNNING); 37312982Sgabeblack@google.com } 37412961Sgabeblack@google.com 37513069Sgabeblack@google.com schedule(&maxTickEvent, maxTick); 37613069Sgabeblack@google.com 37712961Sgabeblack@google.com // Return to gem5 to let it run events, etc. 37812961Sgabeblack@google.com Fiber::primaryFiber()->run(); 37912961Sgabeblack@google.com 38012961Sgabeblack@google.com if (pauseEvent.scheduled()) 38113088Sgabeblack@google.com deschedule(&pauseEvent); 38212961Sgabeblack@google.com if (stopEvent.scheduled()) 38313088Sgabeblack@google.com deschedule(&stopEvent); 38412961Sgabeblack@google.com if (maxTickEvent.scheduled()) 38513088Sgabeblack@google.com deschedule(&maxTickEvent); 38612987Sgabeblack@google.com if (starvationEvent.scheduled()) 38713088Sgabeblack@google.com deschedule(&starvationEvent); 38812961Sgabeblack@google.com} 38912961Sgabeblack@google.com 39012961Sgabeblack@google.comvoid 39113061Sgabeblack@google.comScheduler::oneCycle() 39213061Sgabeblack@google.com{ 39313061Sgabeblack@google.com runOnce = true; 39413095Sgabeblack@google.com scheduleReadyEvent(); 39513061Sgabeblack@google.com start(::MaxTick, false); 39613061Sgabeblack@google.com} 39713061Sgabeblack@google.com 39813061Sgabeblack@google.comvoid 39912961Sgabeblack@google.comScheduler::schedulePause() 40012961Sgabeblack@google.com{ 40112961Sgabeblack@google.com if (pauseEvent.scheduled()) 40212961Sgabeblack@google.com return; 40312961Sgabeblack@google.com 40413088Sgabeblack@google.com schedule(&pauseEvent); 40512961Sgabeblack@google.com} 40612961Sgabeblack@google.com 40712961Sgabeblack@google.comvoid 40812961Sgabeblack@google.comScheduler::scheduleStop(bool finish_delta) 40912961Sgabeblack@google.com{ 41012961Sgabeblack@google.com if (stopEvent.scheduled()) 41112961Sgabeblack@google.com return; 41212961Sgabeblack@google.com 41312961Sgabeblack@google.com if (!finish_delta) { 41413154Sgabeblack@google.com _stopNow = true; 41513076Sgabeblack@google.com // If we're not supposed to finish the delta cycle, flush all 41613076Sgabeblack@google.com // pending activity. 41713076Sgabeblack@google.com clear(); 41812961Sgabeblack@google.com } 41913088Sgabeblack@google.com schedule(&stopEvent); 42012961Sgabeblack@google.com} 42112961Sgabeblack@google.com 42212953Sgabeblack@google.comScheduler scheduler; 42312953Sgabeblack@google.com 42412953Sgabeblack@google.com} // namespace sc_gem5 425