comm_monitor.hh revision 10713 
1/*
2 * Copyright (c) 2012-2013 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Thomas Grass
38 *          Andreas Hansson
39 */
40
41#ifndef __MEM_COMM_MONITOR_HH__
42#define __MEM_COMM_MONITOR_HH__
43
44#include "base/statistics.hh"
45#include "base/time.hh"
46#include "mem/mem_object.hh"
47#include "mem/stack_dist_calc.hh"
48#include "params/CommMonitor.hh"
49#include "proto/protoio.hh"
50#include "sim/system.hh"
51
52/**
53 * The communication monitor is a MemObject which can monitor statistics of
54 * the communication happening between two ports in the memory system.
55 *
56 * Currently the following stats are implemented: Histograms of read/write
57 * transactions, read/write burst lengths, read/write bandwidth,
58 * outstanding read/write requests, read latency and inter transaction time
59 * (read-read, write-write, read/write-read/write). Furthermore it allows
60 * to capture the number of accesses to an address over time ("heat map").
61 * All stats can be disabled from Python.
62 */
63class CommMonitor : public MemObject
64{
65
66  public:
67
68    /** Parameters of communication monitor */
69    typedef CommMonitorParams Params;
70    const Params* params() const
71    { return reinterpret_cast<const Params*>(_params); }
72
73    /**
74     * Constructor based on the Python params
75     *
76     * @param params Python parameters
77     */
78    CommMonitor(Params* params);
79
80    /** Destructor */
81    ~CommMonitor();
82
83    /**
84     * Callback to flush and close all open output streams on exit. If
85     * we were calling the destructor it could be done there.
86     */
87    void closeStreams();
88
89    virtual BaseMasterPort& getMasterPort(const std::string& if_name,
90                                          PortID idx = InvalidPortID);
91
92    virtual BaseSlavePort& getSlavePort(const std::string& if_name,
93                                        PortID idx = InvalidPortID);
94
95    virtual void init();
96
97    /** Register statistics */
98    void regStats();
99
100  private:
101
102    /**
103     * Sender state class for the monitor so that we can annotate
104     * packets with a transmit time and receive time.
105     */
106    class CommMonitorSenderState : public Packet::SenderState
107    {
108
109      public:
110
111        /**
112         * Construct a new sender state and store the time so we can
113         * calculate round-trip latency.
114         *
115         * @param _transmitTime Time of packet transmission
116         */
117        CommMonitorSenderState(Tick _transmitTime)
118            : transmitTime(_transmitTime)
119        { }
120
121        /** Destructor */
122        ~CommMonitorSenderState() { }
123
124        /** Tick when request is transmitted */
125        Tick transmitTime;
126
127    };
128
129    /**
130     * This is the master port of the communication monitor. All recv
131     * functions call a function in CommMonitor, where the
132     * send function of the slave port is called. Besides this, these
133     * functions can also perform actions for capturing statistics.
134     */
135    class MonitorMasterPort : public MasterPort
136    {
137
138      public:
139
140        MonitorMasterPort(const std::string& _name, CommMonitor& _mon)
141            : MasterPort(_name, &_mon), mon(_mon)
142        { }
143
144      protected:
145
146        void recvFunctionalSnoop(PacketPtr pkt)
147        {
148            mon.recvFunctionalSnoop(pkt);
149        }
150
151        Tick recvAtomicSnoop(PacketPtr pkt)
152        {
153            return mon.recvAtomicSnoop(pkt);
154        }
155
156        bool recvTimingResp(PacketPtr pkt)
157        {
158            return mon.recvTimingResp(pkt);
159        }
160
161        void recvTimingSnoopReq(PacketPtr pkt)
162        {
163            mon.recvTimingSnoopReq(pkt);
164        }
165
166        void recvRangeChange()
167        {
168            mon.recvRangeChange();
169        }
170
171        bool isSnooping() const
172        {
173            return mon.isSnooping();
174        }
175
176        void recvReqRetry()
177        {
178            mon.recvReqRetry();
179        }
180
181      private:
182
183        CommMonitor& mon;
184
185    };
186
187    /** Instance of master port, facing the memory side */
188    MonitorMasterPort masterPort;
189
190    /**
191     * This is the slave port of the communication monitor. All recv
192     * functions call a function in CommMonitor, where the
193     * send function of the master port is called. Besides this, these
194     * functions can also perform actions for capturing statistics.
195     */
196    class MonitorSlavePort : public SlavePort
197    {
198
199      public:
200
201        MonitorSlavePort(const std::string& _name, CommMonitor& _mon)
202            : SlavePort(_name, &_mon), mon(_mon)
203        { }
204
205      protected:
206
207        void recvFunctional(PacketPtr pkt)
208        {
209            mon.recvFunctional(pkt);
210        }
211
212        Tick recvAtomic(PacketPtr pkt)
213        {
214            return mon.recvAtomic(pkt);
215        }
216
217        bool recvTimingReq(PacketPtr pkt)
218        {
219            return mon.recvTimingReq(pkt);
220        }
221
222        bool recvTimingSnoopResp(PacketPtr pkt)
223        {
224            return mon.recvTimingSnoopResp(pkt);
225        }
226
227        AddrRangeList getAddrRanges() const
228        {
229            return mon.getAddrRanges();
230        }
231
232        void recvRespRetry()
233        {
234            mon.recvRespRetry();
235        }
236
237      private:
238
239        CommMonitor& mon;
240
241    };
242
243    /** Instance of slave port, i.e. on the CPU side */
244    MonitorSlavePort slavePort;
245
246    void recvFunctional(PacketPtr pkt);
247
248    void recvFunctionalSnoop(PacketPtr pkt);
249
250    Tick recvAtomic(PacketPtr pkt);
251
252    Tick recvAtomicSnoop(PacketPtr pkt);
253
254    bool recvTimingReq(PacketPtr pkt);
255
256    bool recvTimingResp(PacketPtr pkt);
257
258    void recvTimingSnoopReq(PacketPtr pkt);
259
260    bool recvTimingSnoopResp(PacketPtr pkt);
261
262    AddrRangeList getAddrRanges() const;
263
264    bool isSnooping() const;
265
266    void recvReqRetry();
267
268    void recvRespRetry();
269
270    void recvRangeChange();
271
272    /** Stats declarations, all in a struct for convenience. */
273    struct MonitorStats
274    {
275
276        /** Disable flag for burst length historgrams **/
277        bool disableBurstLengthHists;
278
279        /** Histogram of read burst lengths */
280        Stats::Histogram readBurstLengthHist;
281
282        /** Histogram of write burst lengths */
283        Stats::Histogram writeBurstLengthHist;
284
285        /** Disable flag for the bandwidth histograms */
286        bool disableBandwidthHists;
287
288        /**
289         * Histogram for read bandwidth per sample window. The
290         * internal counter is an unsigned int rather than a stat.
291         */
292        unsigned int readBytes;
293        Stats::Histogram readBandwidthHist;
294        Stats::Formula averageReadBW;
295        Stats::Scalar totalReadBytes;
296
297        /**
298         * Histogram for write bandwidth per sample window. The
299         * internal counter is an unsigned int rather than a stat.
300         */
301        unsigned int writtenBytes;
302        Stats::Histogram writeBandwidthHist;
303        Stats::Formula averageWriteBW;
304        Stats::Scalar totalWrittenBytes;
305
306        /** Disable flag for latency histograms. */
307        bool disableLatencyHists;
308
309        /** Histogram of read request-to-response latencies */
310        Stats::Histogram readLatencyHist;
311
312        /** Histogram of write request-to-response latencies */
313        Stats::Histogram writeLatencyHist;
314
315        /** Disable flag for ITT distributions. */
316        bool disableITTDists;
317
318        /**
319         * Inter transaction time (ITT) distributions. There are
320         * histograms of the time between two read, write or arbitrary
321         * accesses. The time of a request is the tick at which the
322         * request is forwarded by the monitor.
323         */
324        Stats::Distribution ittReadRead;
325        Stats::Distribution ittWriteWrite;
326        Stats::Distribution ittReqReq;
327        Tick timeOfLastRead;
328        Tick timeOfLastWrite;
329        Tick timeOfLastReq;
330
331        /** Disable flag for outstanding histograms. */
332        bool disableOutstandingHists;
333
334        /**
335         * Histogram of outstanding read requests. Counter for
336         * outstanding read requests is an unsigned integer because
337         * it should not be reset when stats are reset.
338         */
339        Stats::Histogram outstandingReadsHist;
340        unsigned int outstandingReadReqs;
341
342        /**
343         * Histogram of outstanding write requests. Counter for
344         * outstanding write requests is an unsigned integer because
345         * it should not be reset when stats are reset.
346         */
347        Stats::Histogram outstandingWritesHist;
348        unsigned int outstandingWriteReqs;
349
350        /** Disable flag for transaction histograms. */
351        bool disableTransactionHists;
352
353        /** Histogram of number of read transactions per time bin */
354        Stats::Histogram readTransHist;
355        unsigned int readTrans;
356
357        /** Histogram of number of timing write transactions per time bin */
358        Stats::Histogram writeTransHist;
359        unsigned int writeTrans;
360
361        /** Disable flag for address distributions. */
362        bool disableAddrDists;
363
364        /**
365         * Histogram of number of read accesses to addresses over
366         * time.
367         */
368        Stats::SparseHistogram readAddrDist;
369
370        /**
371         * Histogram of number of write accesses to addresses over
372         * time.
373         */
374        Stats::SparseHistogram writeAddrDist;
375
376        /**
377         * Create the monitor stats and initialise all the members
378         * that are not statistics themselves, but used to control the
379         * stats or track values during a sample period.
380         */
381        MonitorStats(const CommMonitorParams* params) :
382            disableBurstLengthHists(params->disable_burst_length_hists),
383            disableBandwidthHists(params->disable_bandwidth_hists),
384            readBytes(0), writtenBytes(0),
385            disableLatencyHists(params->disable_latency_hists),
386            disableITTDists(params->disable_itt_dists),
387            timeOfLastRead(0), timeOfLastWrite(0), timeOfLastReq(0),
388            disableOutstandingHists(params->disable_outstanding_hists),
389            outstandingReadReqs(0), outstandingWriteReqs(0),
390            disableTransactionHists(params->disable_transaction_hists),
391            readTrans(0), writeTrans(0),
392            disableAddrDists(params->disable_addr_dists)
393        { }
394
395    };
396
397    /** This function is called periodically at the end of each time bin */
398    void samplePeriodic();
399
400    /** Schedule the first periodic event */
401    void startup();
402
403    /** Periodic event called at the end of each simulation time bin */
404    EventWrapper<CommMonitor, &CommMonitor::samplePeriodic> samplePeriodicEvent;
405
406    /** Length of simulation time bin*/
407    Tick samplePeriodTicks;
408    Time samplePeriod;
409
410    /** Address mask for sources of read accesses to be captured */
411    Addr readAddrMask;
412
413    /** Address mask for sources of write accesses to be captured */
414    Addr writeAddrMask;
415
416    /** Instantiate stats */
417    MonitorStats stats;
418
419    /** Optional stack distance calculator */
420    StackDistCalc* stackDistCalc;
421
422    /** Output stream for a potential trace. */
423    ProtoOutputStream* traceStream;
424
425    /** The system in which the monitor lives */
426    System *system;
427};
428
429#endif //__MEM_COMM_MONITOR_HH__
430