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-rw-r--r--src/base/barrier.hh82
-rw-r--r--src/cpu/base.cc6
-rw-r--r--src/cpu/kvm/base.cc3
-rw-r--r--src/dev/etherlink.cc9
-rw-r--r--src/dev/x86/Pc.py3
-rw-r--r--src/python/m5/SimObject.py23
-rw-r--r--src/python/m5/event.py12
-rw-r--r--src/python/m5/main.py4
-rw-r--r--src/python/m5/simulate.py13
-rw-r--r--src/python/swig/event.i12
-rw-r--r--src/sim/Root.py11
-rw-r--r--src/sim/SConscript1
-rw-r--r--src/sim/core.cc2
-rw-r--r--src/sim/core.hh4
-rw-r--r--src/sim/debug.cc16
-rw-r--r--src/sim/eventq.cc67
-rw-r--r--src/sim/eventq.hh225
-rw-r--r--src/sim/eventq_impl.hh28
-rw-r--r--src/sim/global_event.cc166
-rw-r--r--src/sim/global_event.hh230
-rw-r--r--src/sim/root.cc2
-rw-r--r--src/sim/serialize.cc17
-rw-r--r--src/sim/serialize.hh1
-rw-r--r--src/sim/sim_events.cc92
-rw-r--r--src/sim/sim_events.hh41
-rw-r--r--src/sim/sim_exit.hh2
-rw-r--r--src/sim/sim_object.cc2
-rw-r--r--src/sim/simulate.cc161
-rw-r--r--src/sim/simulate.hh2
-rw-r--r--src/sim/stat_control.cc25
30 files changed, 1048 insertions, 214 deletions
diff --git a/src/base/barrier.hh b/src/base/barrier.hh
new file mode 100644
index 000000000..855731d3b
--- /dev/null
+++ b/src/base/barrier.hh
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ */
+
+#ifndef __BASE_BARRIER_HH__
+#define __BASE_BARRIER_HH__
+
+#include <condition_variable>
+
+class Barrier
+{
+ private:
+ /// Mutex to protect access to numLeft and generation
+ std::mutex bMutex;
+ /// Condition variable for waiting on barrier
+ std::condition_variable bCond;
+ /// Number of threads we should be waiting for before completing the barrier
+ unsigned numWaiting;
+ /// Generation of this barrier
+ unsigned generation;
+ /// Number of threads remaining for the current generation
+ unsigned numLeft;
+
+ public:
+ Barrier(unsigned _numWaiting)
+ : numWaiting(_numWaiting), generation(0), numLeft(_numWaiting)
+ {}
+
+ bool
+ wait()
+ {
+ std::unique_lock<std::mutex> lock(bMutex);
+ unsigned int gen = generation;
+
+ if (--numLeft == 0) {
+ generation++;
+ numLeft = numWaiting;
+ bCond.notify_all();
+ return true;
+ }
+ while (gen == generation)
+ bCond.wait(lock);
+ return false;
+ }
+};
+
+#endif // __BASE_BARRIER_HH__
diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 25fe9bf97..3078472fd 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -13,6 +13,8 @@
*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* Copyright (c) 2011 Regents of the University of California
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -569,7 +571,7 @@ void
BaseCPU::scheduleInstStop(ThreadID tid, Counter insts, const char *cause)
{
const Tick now(comInstEventQueue[tid]->getCurTick());
- Event *event(new SimLoopExitEvent(cause, 0));
+ Event *event(new LocalSimLoopExitEvent(cause, 0));
comInstEventQueue[tid]->schedule(event, now + insts);
}
@@ -578,7 +580,7 @@ void
BaseCPU::scheduleLoadStop(ThreadID tid, Counter loads, const char *cause)
{
const Tick now(comLoadEventQueue[tid]->getCurTick());
- Event *event(new SimLoopExitEvent(cause, 0));
+ Event *event(new LocalSimLoopExitEvent(cause, 0));
comLoadEventQueue[tid]->schedule(event, now + loads);
}
diff --git a/src/cpu/kvm/base.cc b/src/cpu/kvm/base.cc
index d03657a88..589964a32 100644
--- a/src/cpu/kvm/base.cc
+++ b/src/cpu/kvm/base.cc
@@ -506,7 +506,8 @@ BaseKvmCPU::tick()
case RunningServiceCompletion:
case Running: {
- Tick ticksToExecute(mainEventQueue.nextTick() - curTick());
+ EventQueue *q = curEventQueue();
+ Tick ticksToExecute(q->nextTick() - curTick());
// We might need to update the KVM state.
syncKvmState();
diff --git a/src/dev/etherlink.cc b/src/dev/etherlink.cc
index 5ebc4fba5..0117bb7c2 100644
--- a/src/dev/etherlink.cc
+++ b/src/dev/etherlink.cc
@@ -142,7 +142,9 @@ class LinkDelayEvent : public Event
void process();
virtual void serialize(ostream &os);
- virtual void unserialize(Checkpoint *cp, const string &section);
+ void unserialize(Checkpoint *cp, const string &section) {}
+ void unserialize(Checkpoint *cp, const string &section,
+ EventQueue *eventq);
static Serializable *createForUnserialize(Checkpoint *cp,
const string &section);
};
@@ -259,9 +261,10 @@ LinkDelayEvent::serialize(ostream &os)
void
-LinkDelayEvent::unserialize(Checkpoint *cp, const string &section)
+LinkDelayEvent::unserialize(Checkpoint *cp, const string &section,
+ EventQueue *eventq)
{
- Event::unserialize(cp, section);
+ Event::unserialize(cp, section, eventq);
EtherLink *parent;
bool number;
diff --git a/src/dev/x86/Pc.py b/src/dev/x86/Pc.py
index 3fc2382b7..bd8b2ad98 100644
--- a/src/dev/x86/Pc.py
+++ b/src/dev/x86/Pc.py
@@ -57,10 +57,9 @@ class Pc(Platform):
behind_pci = IsaFake(pio_addr=x86IOAddress(0xcf8), pio_size=8)
# Serial port and terminal
- terminal = Terminal()
com_1 = Uart8250()
com_1.pio_addr = x86IOAddress(0x3f8)
- com_1.terminal = terminal
+ com_1.terminal = Terminal()
# Devices to catch access to non-existant serial ports.
fake_com_2 = IsaFake(pio_addr=x86IOAddress(0x2f8), pio_size=8)
diff --git a/src/python/m5/SimObject.py b/src/python/m5/SimObject.py
index 14499759c..9b60dfef6 100644
--- a/src/python/m5/SimObject.py
+++ b/src/python/m5/SimObject.py
@@ -11,7 +11,8 @@
# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2004-2006 The Regents of The University of Michigan
-# Copyright (c) 2010 Advanced Micro Devices, Inc.
+# Copyright (c) 2010-20013 Advanced Micro Devices, Inc.
+# Copyright (c) 2013 Mark D. Hill and David A. Wood
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
@@ -528,8 +529,6 @@ struct PyObject;
#endif
#include <string>
-
-class EventQueue;
''')
for param in params:
param.cxx_predecls(code)
@@ -558,16 +557,11 @@ class EventQueue;
code.indent()
if cls == SimObject:
code('''
- SimObjectParams()
- {
- extern EventQueue mainEventQueue;
- eventq = &mainEventQueue;
- }
+ SimObjectParams() {}
virtual ~SimObjectParams() {}
std::string name;
PyObject *pyobj;
- EventQueue *eventq;
''')
for param in params:
param.cxx_decl(code)
@@ -582,6 +576,14 @@ class EventQueue;
return code
+# This *temporary* definition is required to support calls from the
+# SimObject class definition to the MetaSimObject methods (in
+# particular _set_param, which gets called for parameters with default
+# values defined on the SimObject class itself). It will get
+# overridden by the permanent definition (which requires that
+# SimObject be defined) lower in this file.
+def isSimObjectOrVector(value):
+ return False
# The SimObject class is the root of the special hierarchy. Most of
# the code in this class deals with the configuration hierarchy itself
@@ -592,9 +594,10 @@ class SimObject(object):
__metaclass__ = MetaSimObject
type = 'SimObject'
abstract = True
- cxx_header = "sim/sim_object.hh"
+ cxx_header = "sim/sim_object.hh"
cxx_bases = [ "Drainable", "Serializable" ]
+ eventq_index = Param.UInt32(Parent.eventq_index, "Event Queue Index")
@classmethod
def export_method_swig_predecls(cls, code):
diff --git a/src/python/m5/event.py b/src/python/m5/event.py
index 35095599d..76fc37042 100644
--- a/src/python/m5/event.py
+++ b/src/python/m5/event.py
@@ -1,4 +1,6 @@
# Copyright (c) 2006 The Regents of The University of Michigan
+# Copyright (c) 2013 Advanced Micro Devices, Inc.
+# Copyright (c) 2013 Mark D. Hill and David A. Wood
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
@@ -29,9 +31,9 @@
import m5
import internal.event
-from internal.event import PythonEvent, SimLoopExitEvent as SimExit
+from internal.event import PythonEvent, GlobalSimLoopExitEvent as SimExit
-mainq = internal.event.cvar.mainEventQueue
+mainq = None
def create(obj, priority=None):
if priority is None:
@@ -58,4 +60,10 @@ class ProgressEvent(Event):
print "Progress! Time now %fs" % (m5.curTick()/1e12)
self.eventq.schedule(self, m5.curTick() + self.period)
+def getEventQueue(index):
+ return internal.event.getEventQueue(index)
+
+def setEventQueue(eventq):
+ internal.event.curEventQueue(eventq)
+
__all__ = [ 'create', 'Event', 'ProgressEvent', 'SimExit', 'mainq' ]
diff --git a/src/python/m5/main.py b/src/python/m5/main.py
index 611bc99bb..6a6dfa772 100644
--- a/src/python/m5/main.py
+++ b/src/python/m5/main.py
@@ -190,6 +190,10 @@ def main(*args):
fatal("Tracing is not enabled. Compile with TRACING_ON")
+ # Set the main event queue for the main thread.
+ event.mainq = event.getEventQueue(0)
+ event.setEventQueue(event.mainq)
+
if not os.path.isdir(options.outdir):
os.makedirs(options.outdir)
diff --git a/src/python/m5/simulate.py b/src/python/m5/simulate.py
index 322257139..cbd0fb0d4 100644
--- a/src/python/m5/simulate.py
+++ b/src/python/m5/simulate.py
@@ -147,6 +147,13 @@ def simulate(*args, **kwargs):
for obj in root.descendants(): obj.startup()
need_startup = False
+ # Python exit handlers happen in reverse order.
+ # We want to dump stats last.
+ atexit.register(stats.dump)
+
+ # register our C++ exit callback function with Python
+ atexit.register(internal.core.doExitCleanup)
+
for root in need_resume:
resume(root)
need_resume = []
@@ -157,12 +164,6 @@ def simulate(*args, **kwargs):
def curTick():
return internal.core.curTick()
-# Python exit handlers happen in reverse order. We want to dump stats last.
-atexit.register(stats.dump)
-
-# register our C++ exit callback function with Python
-atexit.register(internal.core.doExitCleanup)
-
# Drain the system in preparation of a checkpoint or memory mode
# switch.
def drain(root):
diff --git a/src/python/swig/event.i b/src/python/swig/event.i
index 788ea7cfa..23bb31364 100644
--- a/src/python/swig/event.i
+++ b/src/python/swig/event.i
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2006 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -82,12 +84,13 @@
%include "python/swig/pyevent.hh"
// minimal definition of SimExitEvent interface to wrap
-class SimLoopExitEvent : public Event
+class GlobalSimLoopExitEvent
{
public:
std::string getCause();
int getCode();
- SimLoopExitEvent(const std::string &_cause, int c, Tick _repeat = 0);
+ GlobalSimLoopExitEvent(Tick when, const std::string &_cause, int c,
+ Tick _repeat = 0);
};
%exception simulate {
@@ -96,5 +99,8 @@ class SimLoopExitEvent : public Event
return NULL;
}
}
-SimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
+
+GlobalSimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
void exitSimLoop(const std::string &message, int exit_code);
+void curEventQueue( EventQueue *);
+EventQueue *getEventQueue(uint32_t index);
diff --git a/src/sim/Root.py b/src/sim/Root.py
index 44f768c0b..c6f7cfba6 100644
--- a/src/sim/Root.py
+++ b/src/sim/Root.py
@@ -1,5 +1,6 @@
# Copyright (c) 2005-2007 The Regents of The University of Michigan
-# Copyright (c) 2010 Advanced Micro Devices, Inc.
+# Copyright (c) 2010-2013 Advanced Micro Devices, Inc.
+# Copyright (c) 2013 Mark D. Hill and David A. Wood
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
@@ -60,6 +61,14 @@ class Root(SimObject):
type = 'Root'
cxx_header = "sim/root.hh"
+ # By default, root sim object and hence all other sim objects schedule
+ # event on the eventq with index 0.
+ eventq_index = 0
+
+ # Simulation Quantum for multiple main event queue simulation.
+ # Needs to be set explicitly for a multi-eventq simulation.
+ sim_quantum = Param.Tick(0, "simulation quantum")
+
full_system = Param.Bool("if this is a full system simulation")
# Time syncing prevents the simulation from running faster than real time.
diff --git a/src/sim/SConscript b/src/sim/SConscript
index 850af230e..769c8240d 100644
--- a/src/sim/SConscript
+++ b/src/sim/SConscript
@@ -42,6 +42,7 @@ Source('async.cc')
Source('core.cc')
Source('debug.cc')
Source('eventq.cc')
+Source('global_event.cc')
Source('init.cc')
Source('main.cc', main=True, skip_lib=True)
Source('root.cc')
diff --git a/src/sim/core.cc b/src/sim/core.cc
index aa618bdb3..1333c8b22 100644
--- a/src/sim/core.cc
+++ b/src/sim/core.cc
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2006 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
diff --git a/src/sim/core.hh b/src/sim/core.hh
index b5a082bcb..e0a6af91c 100644
--- a/src/sim/core.hh
+++ b/src/sim/core.hh
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2006 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -42,7 +44,7 @@
#include "sim/eventq.hh"
/// The universal simulation clock.
-inline Tick curTick() { return mainEventQueue.getCurTick(); }
+inline Tick curTick() { return _curEventQueue->getCurTick(); }
const Tick retryTime = 1000;
diff --git a/src/sim/debug.cc b/src/sim/debug.cc
index bfb28198d..0dd16a88d 100644
--- a/src/sim/debug.cc
+++ b/src/sim/debug.cc
@@ -37,6 +37,7 @@
#include "base/debug.hh"
#include "sim/debug.hh"
#include "sim/eventq_impl.hh"
+#include "sim/global_event.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
@@ -46,9 +47,9 @@ using namespace std;
// Debug event: place a breakpoint on the process function and
// schedule the event to break at a particular cycle
//
-struct DebugBreakEvent : public Event
+struct DebugBreakEvent : public GlobalEvent
{
- DebugBreakEvent();
+ DebugBreakEvent(Tick when);
void process(); // process event
virtual const char *description() const;
};
@@ -56,8 +57,8 @@ struct DebugBreakEvent : public Event
//
// constructor: schedule at specified time
//
-DebugBreakEvent::DebugBreakEvent()
- : Event(Debug_Break_Pri, AutoDelete)
+DebugBreakEvent::DebugBreakEvent(Tick when)
+ : GlobalEvent(when, Debug_Break_Pri, AutoDelete)
{
}
@@ -84,7 +85,7 @@ DebugBreakEvent::description() const
void
schedBreak(Tick when)
{
- mainEventQueue.schedule(new DebugBreakEvent, when);
+ new DebugBreakEvent(when);
warn("need to stop all queues");
}
@@ -102,8 +103,9 @@ takeCheckpoint(Tick when)
void
eventqDump()
{
- mainEventQueue.dump();
- warn("need to dump all queues");
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ mainEventQueue[i]->dump();
+ }
}
void
diff --git a/src/sim/eventq.cc b/src/sim/eventq.cc
index d81937a86..0735a011b 100644
--- a/src/sim/eventq.cc
+++ b/src/sim/eventq.cc
@@ -1,6 +1,7 @@
/*
* Copyright (c) 2000-2005 The Regents of The University of Michigan
* Copyright (c) 2008 The Hewlett-Packard Development Company
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -46,13 +47,30 @@
using namespace std;
+Tick simQuantum = 0;
+
//
-// Main Event Queue
+// Main Event Queues
//
-// Events on this queue are processed at the *beginning* of each
+// Events on these queues are processed at the *beginning* of each
// cycle, before the pipeline simulation is performed.
//
-EventQueue mainEventQueue("Main Event Queue");
+uint32_t numMainEventQueues = 0;
+vector<EventQueue *> mainEventQueue;
+__thread EventQueue *_curEventQueue = NULL;
+bool inParallelMode = false;
+
+EventQueue *
+getEventQueue(uint32_t index)
+{
+ while (numMainEventQueues <= index) {
+ numMainEventQueues++;
+ mainEventQueue.push_back(
+ new EventQueue(csprintf("MainEventQueue-%d", index)));
+ }
+
+ return mainEventQueue[index];
+}
#ifndef NDEBUG
Counter Event::instanceCounter = 0;
@@ -156,6 +174,8 @@ EventQueue::remove(Event *event)
if (head == NULL)
panic("event not found!");
+ assert(event->queue == this);
+
// deal with an event on the head's 'in bin' list (event has the same
// time as the head)
if (*head == *event) {
@@ -232,8 +252,13 @@ Event::serialize(std::ostream &os)
void
Event::unserialize(Checkpoint *cp, const string &section)
{
+}
+
+void
+Event::unserialize(Checkpoint *cp, const string &section, EventQueue *eventq)
+{
if (scheduled())
- mainEventQueue.deschedule(this);
+ eventq->deschedule(this);
UNSERIALIZE_SCALAR(_when);
UNSERIALIZE_SCALAR(_priority);
@@ -259,7 +284,7 @@ Event::unserialize(Checkpoint *cp, const string &section)
if (wasScheduled) {
DPRINTF(Config, "rescheduling at %d\n", _when);
- mainEventQueue.schedule(this, _when);
+ eventq->schedule(this, _when);
}
}
@@ -388,7 +413,9 @@ EventQueue::replaceHead(Event* s)
void
dumpMainQueue()
{
- mainEventQueue.dump();
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ mainEventQueue[i]->dump();
+ }
}
@@ -432,5 +459,29 @@ Event::dump() const
}
EventQueue::EventQueue(const string &n)
- : objName(n), head(NULL), _curTick(0)
-{}
+ : objName(n), head(NULL), _curTick(0),
+ async_queue_mutex(new std::mutex())
+{
+}
+
+void
+EventQueue::asyncInsert(Event *event)
+{
+ async_queue_mutex->lock();
+ async_queue.push_back(event);
+ async_queue_mutex->unlock();
+}
+
+void
+EventQueue::handleAsyncInsertions()
+{
+ assert(this == curEventQueue());
+ async_queue_mutex->lock();
+
+ while (!async_queue.empty()) {
+ insert(async_queue.front());
+ async_queue.pop_front();
+ }
+
+ async_queue_mutex->unlock();
+}
diff --git a/src/sim/eventq.hh b/src/sim/eventq.hh
index 223b4941c..66b324c4f 100644
--- a/src/sim/eventq.hh
+++ b/src/sim/eventq.hh
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2000-2005 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -40,6 +42,7 @@
#include <cassert>
#include <climits>
#include <iosfwd>
+#include <mutex>
#include <string>
#include "base/flags.hh"
@@ -49,20 +52,48 @@
#include "sim/serialize.hh"
class EventQueue; // forward declaration
+class BaseGlobalEvent;
-extern EventQueue mainEventQueue;
+//! Simulation Quantum for multiple eventq simulation.
+//! The quantum value is the period length after which the queues
+//! synchronize themselves with each other. This means that any
+//! event to scheduled on Queue A which is generated by an event on
+//! Queue B should be at least simQuantum ticks away in future.
+extern Tick simQuantum;
-/*
- * An item on an event queue. The action caused by a given
- * event is specified by deriving a subclass and overriding the
- * process() member function.
- *
- * Caution, the order of members is chosen to maximize data packing.
+//! Current number of allocated main event queues.
+extern uint32_t numMainEventQueues;
+
+//! Array for main event queues.
+extern std::vector<EventQueue *> mainEventQueue;
+
+#ifndef SWIG
+//! The current event queue for the running thread. Access to this queue
+//! does not require any locking from the thread.
+
+extern __thread EventQueue *_curEventQueue;
+
+#endif
+
+//! Current mode of execution: parallel / serial
+extern bool inParallelMode;
+
+//! Function for returning eventq queue for the provided
+//! index. The function allocates a new queue in case one
+//! does not exist for the index, provided that the index
+//! is with in bounds.
+EventQueue *getEventQueue(uint32_t index);
+
+inline EventQueue *curEventQueue() { return _curEventQueue; }
+inline void curEventQueue(EventQueue *q) { _curEventQueue = q; }
+
+/**
+ * Common base class for Event and GlobalEvent, so they can share flag
+ * and priority definitions and accessor functions. This class should
+ * not be used directly.
*/
-class Event : public Serializable
+class EventBase
{
- friend class EventQueue;
-
protected:
typedef unsigned short FlagsType;
typedef ::Flags<FlagsType> Flags;
@@ -78,15 +109,76 @@ class Event : public Serializable
static const FlagsType Initialized = 0x7a40; // somewhat random bits
static const FlagsType InitMask = 0xffc0; // mask for init bits
- bool
- initialized() const
- {
- return this && (flags & InitMask) == Initialized;
- }
-
public:
typedef int8_t Priority;
+ /// Event priorities, to provide tie-breakers for events scheduled
+ /// at the same cycle. Most events are scheduled at the default
+ /// priority; these values are used to control events that need to
+ /// be ordered within a cycle.
+
+ /// Minimum priority
+ static const Priority Minimum_Pri = SCHAR_MIN;
+
+ /// If we enable tracing on a particular cycle, do that as the
+ /// very first thing so we don't miss any of the events on
+ /// that cycle (even if we enter the debugger).
+ static const Priority Debug_Enable_Pri = -101;
+
+ /// Breakpoints should happen before anything else (except
+ /// enabling trace output), so we don't miss any action when
+ /// debugging.
+ static const Priority Debug_Break_Pri = -100;
+
+ /// CPU switches schedule the new CPU's tick event for the
+ /// same cycle (after unscheduling the old CPU's tick event).
+ /// The switch needs to come before any tick events to make
+ /// sure we don't tick both CPUs in the same cycle.
+ static const Priority CPU_Switch_Pri = -31;
+
+ /// For some reason "delayed" inter-cluster writebacks are
+ /// scheduled before regular writebacks (which have default
+ /// priority). Steve?
+ static const Priority Delayed_Writeback_Pri = -1;
+
+ /// Default is zero for historical reasons.
+ static const Priority Default_Pri = 0;
+
+ /// Serailization needs to occur before tick events also, so
+ /// that a serialize/unserialize is identical to an on-line
+ /// CPU switch.
+ static const Priority Serialize_Pri = 32;
+
+ /// CPU ticks must come after other associated CPU events
+ /// (such as writebacks).
+ static const Priority CPU_Tick_Pri = 50;
+
+ /// Statistics events (dump, reset, etc.) come after
+ /// everything else, but before exit.
+ static const Priority Stat_Event_Pri = 90;
+
+ /// Progress events come at the end.
+ static const Priority Progress_Event_Pri = 95;
+
+ /// If we want to exit on this cycle, it's the very last thing
+ /// we do.
+ static const Priority Sim_Exit_Pri = 100;
+
+ /// Maximum priority
+ static const Priority Maximum_Pri = SCHAR_MAX;
+};
+
+/*
+ * An item on an event queue. The action caused by a given
+ * event is specified by deriving a subclass and overriding the
+ * process() member function.
+ *
+ * Caution, the order of members is chosen to maximize data packing.
+ */
+class Event : public EventBase, public Serializable
+{
+ friend class EventQueue;
+
private:
// The event queue is now a linked list of linked lists. The
// 'nextBin' pointer is to find the bin, where a bin is defined as
@@ -139,6 +231,12 @@ class Event : public Serializable
#endif
}
+ bool
+ initialized() const
+ {
+ return this && (flags & InitMask) == Initialized;
+ }
+
protected:
/// Accessor for flags.
Flags
@@ -179,60 +277,6 @@ class Event : public Serializable
virtual void trace(const char *action); //!< trace event activity
public:
- /// Event priorities, to provide tie-breakers for events scheduled
- /// at the same cycle. Most events are scheduled at the default
- /// priority; these values are used to control events that need to
- /// be ordered within a cycle.
-
- /// Minimum priority
- static const Priority Minimum_Pri = SCHAR_MIN;
-
- /// If we enable tracing on a particular cycle, do that as the
- /// very first thing so we don't miss any of the events on
- /// that cycle (even if we enter the debugger).
- static const Priority Debug_Enable_Pri = -101;
-
- /// Breakpoints should happen before anything else (except
- /// enabling trace output), so we don't miss any action when
- /// debugging.
- static const Priority Debug_Break_Pri = -100;
-
- /// CPU switches schedule the new CPU's tick event for the
- /// same cycle (after unscheduling the old CPU's tick event).
- /// The switch needs to come before any tick events to make
- /// sure we don't tick both CPUs in the same cycle.
- static const Priority CPU_Switch_Pri = -31;
-
- /// For some reason "delayed" inter-cluster writebacks are
- /// scheduled before regular writebacks (which have default
- /// priority). Steve?
- static const Priority Delayed_Writeback_Pri = -1;
-
- /// Default is zero for historical reasons.
- static const Priority Default_Pri = 0;
-
- /// Serailization needs to occur before tick events also, so
- /// that a serialize/unserialize is identical to an on-line
- /// CPU switch.
- static const Priority Serialize_Pri = 32;
-
- /// CPU ticks must come after other associated CPU events
- /// (such as writebacks).
- static const Priority CPU_Tick_Pri = 50;
-
- /// Statistics events (dump, reset, etc.) come after
- /// everything else, but before exit.
- static const Priority Stat_Event_Pri = 90;
-
- /// Progress events come at the end.
- static const Priority Progress_Event_Pri = 95;
-
- /// If we want to exit on this cycle, it's the very last thing
- /// we do.
- static const Priority Sim_Exit_Pri = 100;
-
- /// Maximum priority
- static const Priority Maximum_Pri = SCHAR_MAX;
/*
* Event constructor
@@ -295,9 +339,21 @@ class Event : public Serializable
/// Get the event priority
Priority priority() const { return _priority; }
+ //! If this is part of a GlobalEvent, return the pointer to the
+ //! Global Event. By default, there is no GlobalEvent, so return
+ //! NULL. (Overridden in GlobalEvent::BarrierEvent.)
+ virtual BaseGlobalEvent *globalEvent() { return NULL; }
+
#ifndef SWIG
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
+
+ //! This function is required to support restoring from checkpoints
+ //! when running with multiple queues. Since we still have not thrashed
+ //! out all the details on checkpointing, this function is most likely
+ //! to be revisited in future.
+ virtual void unserialize(Checkpoint *cp, const std::string &section,
+ EventQueue *eventq);
#endif
};
@@ -352,20 +408,40 @@ class EventQueue : public Serializable
Event *head;
Tick _curTick;
+ //! Mutex to protect async queue.
+ std::mutex *async_queue_mutex;
+
+ //! List of events added by other threads to this event queue.
+ std::list<Event*> async_queue;
+
+ //! Insert / remove event from the queue. Should only be called
+ //! by thread operating this queue.
void insert(Event *event);
void remove(Event *event);
+ //! Function for adding events to the async queue. The added events
+ //! are added to main event queue later. Threads, other than the
+ //! owning thread, should call this function instead of insert().
+ void asyncInsert(Event *event);
+
EventQueue(const EventQueue &);
- const EventQueue &operator=(const EventQueue &);
public:
EventQueue(const std::string &n);
virtual const std::string name() const { return objName; }
+ void name(const std::string &st) { objName = st; }
+
+ //! Schedule the given event on this queue. Safe to call from any
+ //! thread.
+ void schedule(Event *event, Tick when, bool global = false);
- // schedule the given event on this queue
- void schedule(Event *event, Tick when);
+ //! Deschedule the specified event. Should be called only from the
+ //! owning thread.
void deschedule(Event *event);
+
+ //! Reschedule the specified event. Should be called only from
+ //! the owning thread.
void reschedule(Event *event, Tick when, bool always = false);
Tick nextTick() const { return head->when(); }
@@ -402,6 +478,9 @@ class EventQueue : public Serializable
bool debugVerify() const;
+ //! Function for moving events from the async_queue to the main queue.
+ void handleAsyncInsertions();
+
/**
* function for replacing the head of the event queue, so that a
* different set of events can run without disturbing events that have
diff --git a/src/sim/eventq_impl.hh b/src/sim/eventq_impl.hh
index c53a4da77..360731d7b 100644
--- a/src/sim/eventq_impl.hh
+++ b/src/sim/eventq_impl.hh
@@ -1,6 +1,7 @@
/*
* Copyright (c) 2012 The Regents of The University of Michigan
- * Copyright (c) 2012 Mark D. Hill and David A. Wood
+ * Copyright (c) 2012-2013 Mark D. Hill and David A. Wood
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -38,19 +39,26 @@
#include "sim/eventq.hh"
inline void
-EventQueue::schedule(Event *event, Tick when)
+EventQueue::schedule(Event *event, Tick when, bool global)
{
assert(when >= getCurTick());
assert(!event->scheduled());
assert(event->initialized());
event->setWhen(when, this);
- insert(event);
+
+ // The check below is to make sure of two things
+ // a. a thread schedules local events on other queues through the asyncq
+ // b. a thread schedules global events on the asyncq, whether or not
+ // this event belongs to this eventq. This is required to maintain
+ // a total order amongst the global events. See global_event.{cc,hh}
+ // for more explanation.
+ if (inParallelMode && (this != curEventQueue() || global)) {
+ asyncInsert(event);
+ } else {
+ insert(event);
+ }
event->flags.set(Event::Scheduled);
- if (this == &mainEventQueue)
- event->flags.set(Event::IsMainQueue);
- else
- event->flags.clear(Event::IsMainQueue);
if (DTRACE(Event))
event->trace("scheduled");
@@ -61,6 +69,7 @@ EventQueue::deschedule(Event *event)
{
assert(event->scheduled());
assert(event->initialized());
+ assert(!inParallelMode || this == curEventQueue());
remove(event);
@@ -80,6 +89,7 @@ EventQueue::reschedule(Event *event, Tick when, bool always)
assert(when >= getCurTick());
assert(always || event->scheduled());
assert(event->initialized());
+ assert(!inParallelMode || this == curEventQueue());
if (event->scheduled())
remove(event);
@@ -88,10 +98,6 @@ EventQueue::reschedule(Event *event, Tick when, bool always)
insert(event);
event->flags.clear(Event::Squashed);
event->flags.set(Event::Scheduled);
- if (this == &mainEventQueue)
- event->flags.set(Event::IsMainQueue);
- else
- event->flags.clear(Event::IsMainQueue);
if (DTRACE(Event))
event->trace("rescheduled");
diff --git a/src/sim/global_event.cc b/src/sim/global_event.cc
new file mode 100644
index 000000000..fedee351f
--- /dev/null
+++ b/src/sim/global_event.cc
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2011-2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Steve Reinhardt
+ */
+
+#include "sim/global_event.hh"
+
+std::mutex BaseGlobalEvent::globalQMutex;
+
+BaseGlobalEvent::BaseGlobalEvent(Priority p, Flags f)
+{
+ barrierEvent.resize(numMainEventQueues);
+ barrier = new Barrier(numMainEventQueues);
+}
+
+
+BaseGlobalEvent::~BaseGlobalEvent()
+{
+ // see GlobalEvent::BarrierEvent::~BarrierEvent() comments
+ if (barrierEvent[0] != NULL) {
+ for (int i = 0; i < numMainEventQueues; ++i)
+ delete barrierEvent[i];
+ }
+}
+
+
+void BaseGlobalEvent::schedule(Tick when)
+{
+ // This function is scheduling a global event, which actually is a
+ // set of local events, one event on each eventq. Global events need
+ // to have a total order. A thread cannot start executing events that
+ // follow a global event till all other threads have executed that global
+ // event as well. If global events were not in a total order, a deadlock
+ // would occur for there will be two threads who would be waiting for
+ // each other to execute the global events they themselves have executed.
+ //
+ // To ensure this total order, we do two things.
+ // First, before scheduling any global event, a thread needs to acquire
+ // the lock globalQMutex. This ensures that only one thread can schedule
+ // global events at any given time.
+ // Second, the local events corresponding to a global event are always
+ // first inserted in to the asyncq, irrespective of whether or not the
+ // thread scheduling the event owns the eventq on which the event is
+ // being scheduled. Thus global events have the same order in the asyncq
+ // of each thread. When they are inserted in the actual eventq, the
+ // comparators in the Event class ensure that the total order is
+ // maintained.
+
+ globalQMutex.lock();
+
+ for (int i = 0; i < numMainEventQueues; ++i) {
+ mainEventQueue[i]->schedule(barrierEvent[i], when, true);
+ }
+
+ globalQMutex.unlock();
+}
+
+void BaseGlobalEvent::deschedule()
+{
+ EventQueue *q = curEventQueue();
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ if (barrierEvent[i]->scheduled()) {
+ curEventQueue(mainEventQueue[i]);
+ mainEventQueue[i]->deschedule(barrierEvent[i]);
+ }
+ }
+
+ curEventQueue(q);
+}
+
+void BaseGlobalEvent::reschedule(Tick when)
+{
+ // Read the comment in the schedule() function above.
+ globalQMutex.lock();
+
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ if (barrierEvent[i]->scheduled())
+ mainEventQueue[i]->reschedule(barrierEvent[i], when);
+ else
+ mainEventQueue[i]->schedule(barrierEvent[i], when, true);
+ }
+
+ globalQMutex.unlock();
+}
+
+BaseGlobalEvent::BarrierEvent::~BarrierEvent()
+{
+ // if AutoDelete is set, local events will get deleted in event
+ // loop, but we need to delete GlobalEvent object too... so let
+ // the local event in slot 0 do it
+ if (isFlagSet(AutoDelete) && _globalEvent->barrierEvent[0] == this) {
+ // set backpointer to NULL so that global event knows not to
+ // turn around and recursively delete local events
+ _globalEvent->barrierEvent[0] = NULL;
+ delete _globalEvent;
+ }
+}
+
+
+void
+GlobalEvent::BarrierEvent::process()
+{
+ // wait for all queues to arrive at barrier, then process event
+ if (globalBarrier()) {
+ _globalEvent->process();
+ }
+
+ // second barrier to force all queues to wait for event processing
+ // to finish before continuing
+ globalBarrier();
+}
+
+
+void
+GlobalSyncEvent::BarrierEvent::process()
+{
+ // wait for all queues to arrive at barrier, then process event
+ if (globalBarrier()) {
+ _globalEvent->process();
+ }
+
+ // second barrier to force all queues to wait for event processing
+ // to finish before continuing
+ globalBarrier();
+ curEventQueue()->handleAsyncInsertions();
+}
+
+void
+GlobalSyncEvent::process()
+{
+ if (repeat) {
+ schedule(curTick() + repeat);
+ }
+}
+
+const char *
+GlobalSyncEvent::description() const
+{
+ return "GlobalSyncEvent";
+}
diff --git a/src/sim/global_event.hh b/src/sim/global_event.hh
new file mode 100644
index 000000000..7b5fd7485
--- /dev/null
+++ b/src/sim/global_event.hh
@@ -0,0 +1,230 @@
+/*
+ * Copyright (c) 2011-2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Steve Reinhardt
+ */
+
+#ifndef __SIM_GLOBAL_EVENT_HH__
+#define __SIM_GLOBAL_EVENT_HH__
+
+#include <mutex>
+#include <vector>
+
+#include "base/barrier.hh"
+#include "sim/eventq_impl.hh"
+
+/**
+ * @file sim/global_event.hh
+ * Global events and related declarations.
+ *
+ * A global event is an event that occurs across all threads, i.e.,
+ * globally. It consists of a set of "local" (regular) Events, one
+ * per thread/event queue, a barrier object, and common state. The
+ * local events are scheduled for the same tick. The local event
+ * process() method enters the barrier to wait for other threads; once
+ * all threads reach that tick (and enter the associated barrier), the
+ * global event is triggered and its associated activity is performed.
+ *
+ * There are two basic global event patterns, GlobalEvent and
+ * GlobalSyncEvent. GlobalEvent is the base class for typical global
+ * events, while GlobalSyncEvent is optimized for global
+ * synchronization operations.
+ */
+
+/**
+ * Common base class for GlobalEvent and GlobalSyncEvent.
+ */
+class BaseGlobalEvent : public EventBase
+{
+ private:
+ //! Mutex variable for providing exculsive right to schedule global
+ //! events. This is necessary so that a total order can be maintained
+ //! amongst the global events. Without ensuring the total order, it is
+ //! possible that threads execute global events in different orders,
+ //! which can result in a deadlock.
+ static std::mutex globalQMutex;
+
+ protected:
+
+ /// The base class for the local events that will synchronize
+ /// threads to perform the global event. This class is abstract,
+ /// since it derives from the abstract Event class but still does
+ /// not define the required process() method.
+ class BarrierEvent : public Event
+ {
+ protected:
+ BaseGlobalEvent *_globalEvent;
+
+ BarrierEvent(BaseGlobalEvent *global_event, Priority p, Flags f)
+ : Event(p, f), _globalEvent(global_event)
+ {
+ }
+
+ ~BarrierEvent();
+
+ friend class BaseGlobalEvent;
+
+ bool globalBarrier()
+ {
+ return _globalEvent->barrier->wait();
+ }
+
+ public:
+ virtual BaseGlobalEvent *globalEvent() { return _globalEvent; }
+ };
+
+ //! The barrier that all threads wait on before performing the
+ //! global event.
+ Barrier *barrier;
+
+ //! The individual local event instances (one per thread/event queue).
+ std::vector<BarrierEvent *> barrierEvent;
+
+ public:
+ BaseGlobalEvent(Priority p, Flags f);
+
+ virtual ~BaseGlobalEvent();
+
+ virtual void process() = 0;
+
+ virtual const char *description() const = 0;
+
+ void schedule(Tick when);
+
+ bool scheduled() const
+ {
+ bool sched = false;
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ sched = sched || barrierEvent[i]->scheduled();
+ }
+
+ return sched;
+ }
+
+ Tick when() const
+ {
+ assert(numMainEventQueues > 0);
+ return barrierEvent[0]->when();
+ }
+
+ void deschedule();
+ void reschedule(Tick when);
+};
+
+
+/**
+ * Funky intermediate class to support CRTP so that we can have a
+ * common constructor to create the local events, even though the
+ * types of the local events are defined in the derived classes.
+ */
+template <class Derived>
+class BaseGlobalEventTemplate : public BaseGlobalEvent
+{
+ protected:
+ BaseGlobalEventTemplate(Priority p, Flags f)
+ : BaseGlobalEvent(p, f)
+ {
+ for (int i = 0; i < numMainEventQueues; ++i)
+ barrierEvent[i] = new typename Derived::BarrierEvent(this, p, f);
+ }
+};
+
+
+/**
+ * The main global event class. Ordinary global events should derive
+ * from this class, and define process() to specify the action to be
+ * taken when the event is reached. All threads will synchronize at a
+ * barrier, exactly one of the threads will execute the process()
+ * method, then the threads will synchronize again so that none of
+ * them continue until process() is complete.
+ */
+class GlobalEvent : public BaseGlobalEventTemplate<GlobalEvent>
+{
+ public:
+ typedef BaseGlobalEventTemplate<GlobalEvent> Base;
+
+ class BarrierEvent : public Base::BarrierEvent
+ {
+ public:
+ void process();
+ BarrierEvent(Base *global_event, Priority p, Flags f)
+ : Base::BarrierEvent(global_event, p, f)
+ { }
+ };
+
+ GlobalEvent(Priority p, Flags f)
+ : Base(p, f)
+ { }
+
+ GlobalEvent(Tick when, Priority p, Flags f)
+ : Base(p, f)
+ {
+ schedule(when);
+ }
+
+ virtual void process() = 0;
+};
+
+/**
+ * A special global event that synchronizes all threads and forces
+ * them to process asynchronously enqueued events. Useful for
+ * separating quanta in a quantum-based parallel simulation.
+ */
+class GlobalSyncEvent : public BaseGlobalEventTemplate<GlobalSyncEvent>
+{
+ public:
+ typedef BaseGlobalEventTemplate<GlobalSyncEvent> Base;
+
+ class BarrierEvent : public Base::BarrierEvent
+ {
+ public:
+ void process();
+ BarrierEvent(Base *global_event, Priority p, Flags f)
+ : Base::BarrierEvent(global_event, p, f)
+ { }
+ };
+
+ GlobalSyncEvent(Priority p, Flags f)
+ : Base(p, f)
+ { }
+
+ GlobalSyncEvent(Tick when, Tick _repeat, Priority p, Flags f)
+ : Base(p, f), repeat(_repeat)
+ {
+ schedule(when);
+ }
+
+ void process();
+
+ const char *description() const;
+
+ Tick repeat;
+};
+
+
+#endif // __SIM_GLOBAL_EVENT_HH__
diff --git a/src/sim/root.cc b/src/sim/root.cc
index f77159486..9bb8b4f05 100644
--- a/src/sim/root.cc
+++ b/src/sim/root.cc
@@ -112,6 +112,8 @@ Root::Root(RootParams *p) : SimObject(p), _enabled(false),
assert(_root == NULL);
_root = this;
lastTime.setTimer();
+
+ simQuantum = p->sim_quantum;
}
void
diff --git a/src/sim/serialize.cc b/src/sim/serialize.cc
index 9ef92d449..18af044d0 100644
--- a/src/sim/serialize.cc
+++ b/src/sim/serialize.cc
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -456,8 +458,12 @@ Globals::serialize(ostream &os)
nameOut(os);
paramOut(os, "curTick", curTick());
- nameOut(os, "MainEventQueue");
- mainEventQueue.serialize(os);
+ paramOut(os, "numMainEventQueues", numMainEventQueues);
+
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ nameOut(os, "MainEventQueue");
+ mainEventQueue[i]->serialize(os);
+ }
}
void
@@ -465,9 +471,12 @@ Globals::unserialize(Checkpoint *cp, const std::string &section)
{
Tick tick;
paramIn(cp, section, "curTick", tick);
- mainEventQueue.setCurTick(tick);
+ paramIn(cp, section, "numMainEventQueues", numMainEventQueues);
- mainEventQueue.unserialize(cp, "MainEventQueue");
+ for (uint32_t i = 0; i < numMainEventQueues; ++i) {
+ mainEventQueue[i]->setCurTick(tick);
+ mainEventQueue[i]->unserialize(cp, "MainEventQueue");
+ }
}
Serializable::Serializable()
diff --git a/src/sim/serialize.hh b/src/sim/serialize.hh
index 1e9566519..6d4207090 100644
--- a/src/sim/serialize.hh
+++ b/src/sim/serialize.hh
@@ -49,6 +49,7 @@ class IniFile;
class Serializable;
class Checkpoint;
class SimObject;
+class EventQueue;
/** The current version of the checkpoint format.
* This should be incremented by 1 and only 1 for every new version, where a new
diff --git a/src/sim/sim_events.cc b/src/sim/sim_events.cc
index 5380ddd83..5e47adca1 100644
--- a/src/sim/sim_events.cc
+++ b/src/sim/sim_events.cc
@@ -12,6 +12,8 @@
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -51,53 +53,71 @@
using namespace std;
-SimLoopExitEvent::SimLoopExitEvent()
+GlobalSimLoopExitEvent::GlobalSimLoopExitEvent(Tick when,
+ const std::string &_cause,
+ int c, Tick r, bool serialize)
+ : GlobalEvent(when, Sim_Exit_Pri,
+ IsExitEvent | (serialize ? AutoSerialize : 0)),
+ cause(_cause), code(c), repeat(r)
+{
+}
+
+const char *
+GlobalSimLoopExitEvent::description() const
+{
+ return "global simulation loop exit";
+}
+
+//
+// handle termination event
+//
+void
+GlobalSimLoopExitEvent::process()
+{
+ if (repeat) {
+ schedule(curTick() + repeat);
+ }
+}
+
+void
+exitSimLoop(const std::string &message, int exit_code, Tick when, Tick repeat,
+ bool serialize)
+{
+ new GlobalSimLoopExitEvent(when + simQuantum, message, exit_code, repeat,
+ serialize);
+}
+
+LocalSimLoopExitEvent::LocalSimLoopExitEvent()
: Event(Sim_Exit_Pri, IsExitEvent | AutoSerialize),
cause(""), code(0), repeat(0)
{
}
-SimLoopExitEvent::SimLoopExitEvent(const std::string &_cause, int c, Tick r,
- bool serialize)
+LocalSimLoopExitEvent::LocalSimLoopExitEvent(const std::string &_cause, int c,
+ Tick r, bool serialize)
: Event(Sim_Exit_Pri, IsExitEvent | (serialize ? AutoSerialize : 0)),
cause(_cause), code(c), repeat(r)
{
}
-
//
// handle termination event
//
void
-SimLoopExitEvent::process()
+LocalSimLoopExitEvent::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 (!isFlagSet(IsMainQueue)) {
- exitSimLoop(cause, code);
- setFlags(AutoDelete);
- }
-
- // 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) {
- assert(isFlagSet(IsMainQueue));
- mainEventQueue.schedule(this, curTick() + repeat);
- }
+ exitSimLoop(cause, 0);
}
const char *
-SimLoopExitEvent::description() const
+LocalSimLoopExitEvent::description() const
{
return "simulation loop exit";
}
void
-SimLoopExitEvent::serialize(ostream &os)
+LocalSimLoopExitEvent::serialize(ostream &os)
{
paramOut(os, "type", string("SimLoopExitEvent"));
Event::serialize(os);
@@ -108,7 +128,7 @@ SimLoopExitEvent::serialize(ostream &os)
}
void
-SimLoopExitEvent::unserialize(Checkpoint *cp, const string &section)
+LocalSimLoopExitEvent::unserialize(Checkpoint *cp, const string &section)
{
Event::unserialize(cp, section);
@@ -117,22 +137,26 @@ SimLoopExitEvent::unserialize(Checkpoint *cp, const string &section)
UNSERIALIZE_SCALAR(repeat);
}
-Serializable *
-SimLoopExitEvent::createForUnserialize(Checkpoint *cp, const string &section)
+void
+LocalSimLoopExitEvent::unserialize(Checkpoint *cp, const string &section,
+ EventQueue *eventq)
{
- return new SimLoopExitEvent();
-}
+ Event::unserialize(cp, section, eventq);
-REGISTER_SERIALIZEABLE("SimLoopExitEvent", SimLoopExitEvent)
+ UNSERIALIZE_SCALAR(cause);
+ UNSERIALIZE_SCALAR(code);
+ UNSERIALIZE_SCALAR(repeat);
+}
-void
-exitSimLoop(const std::string &message, int exit_code, Tick when, Tick repeat,
- bool serialize)
+Serializable *
+LocalSimLoopExitEvent::createForUnserialize(Checkpoint *cp,
+ const string &section)
{
- Event *event = new SimLoopExitEvent(message, exit_code, repeat, serialize);
- mainEventQueue.schedule(event, when);
+ return new LocalSimLoopExitEvent();
}
+REGISTER_SERIALIZEABLE("LocalSimLoopExitEvent", LocalSimLoopExitEvent)
+
//
// constructor: automatically schedules at specified time
//
diff --git a/src/sim/sim_events.hh b/src/sim/sim_events.hh
index 4abfb317c..5be2609fd 100644
--- a/src/sim/sim_events.hh
+++ b/src/sim/sim_events.hh
@@ -12,6 +12,8 @@
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -43,13 +45,13 @@
#ifndef __SIM_SIM_EVENTS_HH__
#define __SIM_SIM_EVENTS_HH__
-#include "sim/eventq.hh"
+#include "sim/global_event.hh"
#include "sim/serialize.hh"
//
// Event to terminate simulation at a particular cycle/instruction
//
-class SimLoopExitEvent : public Event
+class GlobalSimLoopExitEvent : public GlobalEvent
{
protected:
// string explaining why we're terminating
@@ -59,12 +61,33 @@ class SimLoopExitEvent : public Event
public:
// non-scheduling version for createForUnserialize()
- SimLoopExitEvent();
- SimLoopExitEvent(const std::string &_cause, int c, Tick repeat = 0,
- bool serialize = false);
+ GlobalSimLoopExitEvent();
+ GlobalSimLoopExitEvent(Tick when, const std::string &_cause, int c,
+ Tick repeat = 0, bool serialize = false);
- std::string getCause() { return cause; }
- int getCode() { return code; }
+ const std::string getCause() const { return cause; }
+ const int getCode() const { return code; }
+
+ void process(); // process event
+
+ virtual const char *description() const;
+};
+
+class LocalSimLoopExitEvent : public Event
+{
+ protected:
+ // string explaining why we're terminating
+ std::string cause;
+ int code;
+ Tick repeat;
+
+ public:
+ LocalSimLoopExitEvent();
+ LocalSimLoopExitEvent(const std::string &_cause, int c, Tick repeat = 0,
+ bool serialize = false);
+
+ const std::string getCause() const { return cause; }
+ const int getCode() const { return code; }
void process(); // process event
@@ -72,6 +95,8 @@ class SimLoopExitEvent : public Event
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
+ virtual void unserialize(Checkpoint *cp, const std::string &section,
+ EventQueue *eventq);
static Serializable *createForUnserialize(Checkpoint *cp,
const std::string &section);
};
@@ -89,7 +114,7 @@ class CountedDrainEvent : public Event
void setCount(int _count) { count = _count; }
- int getCount() { return count; }
+ const int getCount() const { return count; }
};
//
diff --git a/src/sim/sim_exit.hh b/src/sim/sim_exit.hh
index ef73d822d..218db9aeb 100644
--- a/src/sim/sim_exit.hh
+++ b/src/sim/sim_exit.hh
@@ -39,8 +39,6 @@
// forward declaration
class Callback;
-class EventQueue;
-class SimLoopExitEvent;
/// Register a callback to be called when Python exits. Defined in
/// sim/main.cc.
diff --git a/src/sim/sim_object.cc b/src/sim/sim_object.cc
index 345fb85cb..0edad719e 100644
--- a/src/sim/sim_object.cc
+++ b/src/sim/sim_object.cc
@@ -60,7 +60,7 @@ SimObject::SimObjectList SimObject::simObjectList;
// SimObject constructor: used to maintain static simObjectList
//
SimObject::SimObject(const Params *p)
- : EventManager(p->eventq), _params(p)
+ : EventManager(getEventQueue(p->eventq_index)), _params(p)
{
#ifdef DEBUG
doDebugBreak = false;
diff --git a/src/sim/simulate.cc b/src/sim/simulate.cc
index 6962fab9f..78695688a 100644
--- a/src/sim/simulate.cc
+++ b/src/sim/simulate.cc
@@ -1,5 +1,7 @@
/*
* Copyright (c) 2006 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -29,6 +31,9 @@
* Steve Reinhardt
*/
+#include <mutex>
+#include <thread>
+
#include "base/misc.hh"
#include "base/pollevent.hh"
#include "base/types.hh"
@@ -39,14 +44,60 @@
#include "sim/simulate.hh"
#include "sim/stat_control.hh"
+//! Mutex for handling async events.
+std::mutex asyncEventMutex;
+
+//! Global barrier for synchronizing threads entering/exiting the
+//! simulation loop.
+Barrier *threadBarrier;
+
+//! forward declaration
+Event *doSimLoop(EventQueue *);
+
+/**
+ * The main function for all subordinate threads (i.e., all threads
+ * other than the main thread). These threads start by waiting on
+ * threadBarrier. Once all threads have arrived at threadBarrier,
+ * they enter the simulation loop concurrently. When they exit the
+ * loop, they return to waiting on threadBarrier. This process is
+ * repeated until the simulation terminates.
+ */
+static void
+thread_loop(EventQueue *queue)
+{
+ while (true) {
+ threadBarrier->wait();
+ doSimLoop(queue);
+ }
+}
+
/** Simulate for num_cycles additional cycles. If num_cycles is -1
* (the default), do not limit simulation; some other event must
* terminate the loop. Exported to Python via SWIG.
* @return The SimLoopExitEvent that caused the loop to exit.
*/
-SimLoopExitEvent *
+GlobalSimLoopExitEvent *
simulate(Tick num_cycles)
{
+ // The first time simulate() is called from the Python code, we need to
+ // create a thread for each of event queues referenced by the
+ // instantiated sim objects.
+ static bool threads_initialized = false;
+ static std::vector<std::thread *> threads;
+
+ if (!threads_initialized) {
+ threadBarrier = new Barrier(numMainEventQueues);
+
+ // the main thread (the one we're currently running on)
+ // handles queue 0, so we only need to allocate new threads
+ // for queues 1..N-1. We'll call these the "subordinate" threads.
+ for (uint32_t i = 1; i < numMainEventQueues; i++) {
+ threads.push_back(new std::thread(thread_loop, mainEventQueue[i]));
+ }
+
+ threads_initialized = true;
+ }
+
inform("Entering event queue @ %d. Starting simulation...\n", curTick());
if (num_cycles < MaxTick - curTick())
@@ -54,38 +105,99 @@ simulate(Tick num_cycles)
else // counter would roll over or be set to MaxTick anyhow
num_cycles = MaxTick;
- Event *limit_event =
- new SimLoopExitEvent("simulate() limit reached", 0);
- mainEventQueue.schedule(limit_event, num_cycles);
+ GlobalEvent *limit_event = new GlobalSimLoopExitEvent(num_cycles,
+ "simulate() limit reached", 0, 0);
+
+ GlobalSyncEvent *quantum_event = NULL;
+ if (numMainEventQueues > 1) {
+ if (simQuantum == 0) {
+ fatal("Quantum for multi-eventq simulation not specified");
+ }
+
+ quantum_event = new GlobalSyncEvent(simQuantum, simQuantum,
+ EventBase::Progress_Event_Pri, 0);
+
+ inParallelMode = true;
+ }
+
+ // all subordinate (created) threads should be waiting on the
+ // barrier; the arrival of the main thread here will satisfy the
+ // barrier, and all threads will enter doSimLoop in parallel
+ threadBarrier->wait();
+ Event *local_event = doSimLoop(mainEventQueue[0]);
+ assert(local_event != NULL);
+
+ inParallelMode = false;
+
+ // locate the global exit event and return it to Python
+ BaseGlobalEvent *global_event = local_event->globalEvent();
+ assert(global_event != NULL);
+
+ GlobalSimLoopExitEvent *global_exit_event =
+ dynamic_cast<GlobalSimLoopExitEvent *>(global_event);
+ assert(global_exit_event != NULL);
+
+ // if we didn't hit limit_event, delete it.
+ if (global_exit_event != limit_event) {
+ assert(limit_event->scheduled());
+ limit_event->deschedule();
+ delete limit_event;
+ }
+
+ //! Delete the simulation quantum event.
+ if (quantum_event != NULL) {
+ quantum_event->deschedule();
+ delete quantum_event;
+ }
+
+ return global_exit_event;
+}
+
+/**
+ * Test and clear the global async_event flag, such that each time the
+ * flag is cleared, only one thread returns true (and thus is assigned
+ * to handle the corresponding async event(s)).
+ */
+static bool
+testAndClearAsyncEvent()
+{
+ bool was_set = false;
+ asyncEventMutex.lock();
+
+ if (async_event) {
+ was_set = true;
+ async_event = false;
+ }
+
+ asyncEventMutex.unlock();
+ return was_set;
+}
+
+/**
+ * The main per-thread simulation loop. This loop is executed by all
+ * simulation threads (the main thread and the subordinate threads) in
+ * parallel.
+ */
+Event *
+doSimLoop(EventQueue *eventq)
+{
+ // set the per thread current eventq pointer
+ curEventQueue(eventq);
+ eventq->handleAsyncInsertions();
while (1) {
// there should always be at least one event (the SimLoopExitEvent
// we just scheduled) in the queue
- assert(!mainEventQueue.empty());
- assert(curTick() <= mainEventQueue.nextTick() &&
+ assert(!eventq->empty());
+ assert(curTick() <= eventq->nextTick() &&
"event scheduled in the past");
- Event *exit_event = mainEventQueue.serviceOne();
+ Event *exit_event = eventq->serviceOne();
if (exit_event != NULL) {
- // hit some kind of exit event; return to Python
- // event must be subclass of SimLoopExitEvent...
- SimLoopExitEvent *se_event;
- se_event = dynamic_cast<SimLoopExitEvent *>(exit_event);
-
- if (se_event == NULL)
- panic("Bogus exit event class!");
-
- // if we didn't hit limit_event, delete it
- if (se_event != limit_event) {
- assert(limit_event->scheduled());
- limit_event->squash();
- hack_once("be nice to actually delete the event here");
- }
-
- return se_event;
+ return exit_event;
}
- if (async_event) {
+ if (async_event && testAndClearAsyncEvent()) {
async_event = false;
if (async_statdump || async_statreset) {
Stats::schedStatEvent(async_statdump, async_statreset);
@@ -113,4 +225,3 @@ simulate(Tick num_cycles)
// not reached... only exit is return on SimLoopExitEvent
}
-
diff --git a/src/sim/simulate.hh b/src/sim/simulate.hh
index 978082f82..5e51c76b6 100644
--- a/src/sim/simulate.hh
+++ b/src/sim/simulate.hh
@@ -32,4 +32,4 @@
#include "base/types.hh"
#include "sim/sim_events.hh"
-SimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
+GlobalSimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
diff --git a/src/sim/stat_control.cc b/src/sim/stat_control.cc
index 7a8d48ae2..83089f399 100644
--- a/src/sim/stat_control.cc
+++ b/src/sim/stat_control.cc
@@ -12,6 +12,8 @@
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
+ * Copyright (c) 2013 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -53,7 +55,7 @@
#include "base/statistics.hh"
#include "base/time.hh"
#include "cpu/base.hh"
-#include "sim/eventq_impl.hh"
+#include "sim/global_event.hh"
#include "sim/stat_control.hh"
using namespace std;
@@ -68,7 +70,7 @@ namespace Stats {
Time statTime(true);
Tick startTick;
-Event *dumpEvent;
+GlobalEvent *dumpEvent;
struct SimTicksReset : public Callback
{
@@ -210,7 +212,7 @@ initSimStats()
/**
* Event to dump and/or reset the statistics.
*/
-class StatEvent : public Event
+class StatEvent : public GlobalEvent
{
private:
bool dump;
@@ -218,8 +220,8 @@ class StatEvent : public Event
Tick repeat;
public:
- StatEvent(bool _dump, bool _reset, Tick _repeat)
- : Event(Stat_Event_Pri, AutoDelete),
+ StatEvent(Tick _when, bool _dump, bool _reset, Tick _repeat)
+ : GlobalEvent(_when, Stat_Event_Pri, 0),
dump(_dump), reset(_reset), repeat(_repeat)
{
}
@@ -237,13 +239,18 @@ class StatEvent : public Event
Stats::schedStatEvent(dump, reset, curTick() + repeat, repeat);
}
}
+
+ const char *description() const { return "GlobalStatEvent"; }
};
void
schedStatEvent(bool dump, bool reset, Tick when, Tick repeat)
{
- dumpEvent = new StatEvent(dump, reset, repeat);
- mainEventQueue.schedule(dumpEvent, when);
+ // simQuantum is being added to the time when the stats would be
+ // dumped so as to ensure that this event happens only after the next
+ // sync amongst the event queues. Asingle event queue simulation
+ // should remain unaffected.
+ dumpEvent = new StatEvent(when + simQuantum, dump, reset, repeat);
}
void
@@ -258,7 +265,7 @@ periodicStatDump(Tick period)
*/
if (dumpEvent != NULL && (period == 0 || dumpEvent->scheduled())) {
// Event should AutoDelete, so we do not need to free it.
- mainEventQueue.deschedule(dumpEvent);
+ dumpEvent->deschedule();
}
/*
@@ -288,7 +295,7 @@ updateEvents()
(dumpEvent->scheduled() && dumpEvent->when() < curTick())) {
// shift by curTick() and reschedule
Tick _when = dumpEvent->when();
- mainEventQueue.reschedule(dumpEvent, _when + curTick());
+ dumpEvent->reschedule(_when + curTick());
}
}
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