comm_monitor.hh revision 10994 
1/*
2 * Copyright (c) 2012-2013, 2015 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 "mem/mem_object.hh"
46#include "mem/stack_dist_calc.hh"
47#include "params/CommMonitor.hh"
48#include "proto/protoio.hh"
49#include "sim/probe/mem.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: // Construction & SimObject interfaces
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    void init() M5_ATTR_OVERRIDE;
84    void regStats() M5_ATTR_OVERRIDE;
85    void startup() M5_ATTR_OVERRIDE;
86    void regProbePoints() M5_ATTR_OVERRIDE;
87
88  public: // MemObject interfaces
89    BaseMasterPort& getMasterPort(const std::string& if_name,
90                                  PortID idx = InvalidPortID) M5_ATTR_OVERRIDE;
91
92    BaseSlavePort& getSlavePort(const std::string& if_name,
93                                PortID idx = InvalidPortID) M5_ATTR_OVERRIDE;
94
95  private:
96
97    /**
98     * Sender state class for the monitor so that we can annotate
99     * packets with a transmit time and receive time.
100     */
101    class CommMonitorSenderState : public Packet::SenderState
102    {
103
104      public:
105
106        /**
107         * Construct a new sender state and store the time so we can
108         * calculate round-trip latency.
109         *
110         * @param _transmitTime Time of packet transmission
111         */
112        CommMonitorSenderState(Tick _transmitTime)
113            : transmitTime(_transmitTime)
114        { }
115
116        /** Destructor */
117        ~CommMonitorSenderState() { }
118
119        /** Tick when request is transmitted */
120        Tick transmitTime;
121
122    };
123
124    /**
125     * This is the master port of the communication monitor. All recv
126     * functions call a function in CommMonitor, where the
127     * send function of the slave port is called. Besides this, these
128     * functions can also perform actions for capturing statistics.
129     */
130    class MonitorMasterPort : public MasterPort
131    {
132
133      public:
134
135        MonitorMasterPort(const std::string& _name, CommMonitor& _mon)
136            : MasterPort(_name, &_mon), mon(_mon)
137        { }
138
139      protected:
140
141        void recvFunctionalSnoop(PacketPtr pkt)
142        {
143            mon.recvFunctionalSnoop(pkt);
144        }
145
146        Tick recvAtomicSnoop(PacketPtr pkt)
147        {
148            return mon.recvAtomicSnoop(pkt);
149        }
150
151        bool recvTimingResp(PacketPtr pkt)
152        {
153            return mon.recvTimingResp(pkt);
154        }
155
156        void recvTimingSnoopReq(PacketPtr pkt)
157        {
158            mon.recvTimingSnoopReq(pkt);
159        }
160
161        void recvRangeChange()
162        {
163            mon.recvRangeChange();
164        }
165
166        bool isSnooping() const
167        {
168            return mon.isSnooping();
169        }
170
171        void recvReqRetry()
172        {
173            mon.recvReqRetry();
174        }
175
176      private:
177
178        CommMonitor& mon;
179
180    };
181
182    /** Instance of master port, facing the memory side */
183    MonitorMasterPort masterPort;
184
185    /**
186     * This is the slave port of the communication monitor. All recv
187     * functions call a function in CommMonitor, where the
188     * send function of the master port is called. Besides this, these
189     * functions can also perform actions for capturing statistics.
190     */
191    class MonitorSlavePort : public SlavePort
192    {
193
194      public:
195
196        MonitorSlavePort(const std::string& _name, CommMonitor& _mon)
197            : SlavePort(_name, &_mon), mon(_mon)
198        { }
199
200      protected:
201
202        void recvFunctional(PacketPtr pkt)
203        {
204            mon.recvFunctional(pkt);
205        }
206
207        Tick recvAtomic(PacketPtr pkt)
208        {
209            return mon.recvAtomic(pkt);
210        }
211
212        bool recvTimingReq(PacketPtr pkt)
213        {
214            return mon.recvTimingReq(pkt);
215        }
216
217        bool recvTimingSnoopResp(PacketPtr pkt)
218        {
219            return mon.recvTimingSnoopResp(pkt);
220        }
221
222        AddrRangeList getAddrRanges() const
223        {
224            return mon.getAddrRanges();
225        }
226
227        void recvRespRetry()
228        {
229            mon.recvRespRetry();
230        }
231
232      private:
233
234        CommMonitor& mon;
235
236    };
237
238    /** Instance of slave port, i.e. on the CPU side */
239    MonitorSlavePort slavePort;
240
241    void recvFunctional(PacketPtr pkt);
242
243    void recvFunctionalSnoop(PacketPtr pkt);
244
245    Tick recvAtomic(PacketPtr pkt);
246
247    Tick recvAtomicSnoop(PacketPtr pkt);
248
249    bool recvTimingReq(PacketPtr pkt);
250
251    bool recvTimingResp(PacketPtr pkt);
252
253    void recvTimingSnoopReq(PacketPtr pkt);
254
255    bool recvTimingSnoopResp(PacketPtr pkt);
256
257    AddrRangeList getAddrRanges() const;
258
259    bool isSnooping() const;
260
261    void recvReqRetry();
262
263    void recvRespRetry();
264
265    void recvRangeChange();
266
267    /** Stats declarations, all in a struct for convenience. */
268    struct MonitorStats
269    {
270
271        /** Disable flag for burst length historgrams **/
272        bool disableBurstLengthHists;
273
274        /** Histogram of read burst lengths */
275        Stats::Histogram readBurstLengthHist;
276
277        /** Histogram of write burst lengths */
278        Stats::Histogram writeBurstLengthHist;
279
280        /** Disable flag for the bandwidth histograms */
281        bool disableBandwidthHists;
282
283        /**
284         * Histogram for read bandwidth per sample window. The
285         * internal counter is an unsigned int rather than a stat.
286         */
287        unsigned int readBytes;
288        Stats::Histogram readBandwidthHist;
289        Stats::Formula averageReadBW;
290        Stats::Scalar totalReadBytes;
291
292        /**
293         * Histogram for write bandwidth per sample window. The
294         * internal counter is an unsigned int rather than a stat.
295         */
296        unsigned int writtenBytes;
297        Stats::Histogram writeBandwidthHist;
298        Stats::Formula averageWriteBW;
299        Stats::Scalar totalWrittenBytes;
300
301        /** Disable flag for latency histograms. */
302        bool disableLatencyHists;
303
304        /** Histogram of read request-to-response latencies */
305        Stats::Histogram readLatencyHist;
306
307        /** Histogram of write request-to-response latencies */
308        Stats::Histogram writeLatencyHist;
309
310        /** Disable flag for ITT distributions. */
311        bool disableITTDists;
312
313        /**
314         * Inter transaction time (ITT) distributions. There are
315         * histograms of the time between two read, write or arbitrary
316         * accesses. The time of a request is the tick at which the
317         * request is forwarded by the monitor.
318         */
319        Stats::Distribution ittReadRead;
320        Stats::Distribution ittWriteWrite;
321        Stats::Distribution ittReqReq;
322        Tick timeOfLastRead;
323        Tick timeOfLastWrite;
324        Tick timeOfLastReq;
325
326        /** Disable flag for outstanding histograms. */
327        bool disableOutstandingHists;
328
329        /**
330         * Histogram of outstanding read requests. Counter for
331         * outstanding read requests is an unsigned integer because
332         * it should not be reset when stats are reset.
333         */
334        Stats::Histogram outstandingReadsHist;
335        unsigned int outstandingReadReqs;
336
337        /**
338         * Histogram of outstanding write requests. Counter for
339         * outstanding write requests is an unsigned integer because
340         * it should not be reset when stats are reset.
341         */
342        Stats::Histogram outstandingWritesHist;
343        unsigned int outstandingWriteReqs;
344
345        /** Disable flag for transaction histograms. */
346        bool disableTransactionHists;
347
348        /** Histogram of number of read transactions per time bin */
349        Stats::Histogram readTransHist;
350        unsigned int readTrans;
351
352        /** Histogram of number of timing write transactions per time bin */
353        Stats::Histogram writeTransHist;
354        unsigned int writeTrans;
355
356        /** Disable flag for address distributions. */
357        bool disableAddrDists;
358
359        /**
360         * Histogram of number of read accesses to addresses over
361         * time.
362         */
363        Stats::SparseHistogram readAddrDist;
364
365        /**
366         * Histogram of number of write accesses to addresses over
367         * time.
368         */
369        Stats::SparseHistogram writeAddrDist;
370
371        /**
372         * Create the monitor stats and initialise all the members
373         * that are not statistics themselves, but used to control the
374         * stats or track values during a sample period.
375         */
376        MonitorStats(const CommMonitorParams* params) :
377            disableBurstLengthHists(params->disable_burst_length_hists),
378            disableBandwidthHists(params->disable_bandwidth_hists),
379            readBytes(0), writtenBytes(0),
380            disableLatencyHists(params->disable_latency_hists),
381            disableITTDists(params->disable_itt_dists),
382            timeOfLastRead(0), timeOfLastWrite(0), timeOfLastReq(0),
383            disableOutstandingHists(params->disable_outstanding_hists),
384            outstandingReadReqs(0), outstandingWriteReqs(0),
385            disableTransactionHists(params->disable_transaction_hists),
386            readTrans(0), writeTrans(0),
387            disableAddrDists(params->disable_addr_dists)
388        { }
389
390    };
391
392    /** This function is called periodically at the end of each time bin */
393    void samplePeriodic();
394
395    /**
396     * Callback to flush and close all open output streams on exit. If
397     * we were calling the destructor it could be done there.
398     */
399    void closeStreams();
400
401    /** Periodic event called at the end of each simulation time bin */
402    EventWrapper<CommMonitor, &CommMonitor::samplePeriodic> samplePeriodicEvent;
403
404    /**
405     *@{
406     * @name Configuration
407     */
408
409    /** Length of simulation time bin*/
410    const Tick samplePeriodTicks;
411    /** Sample period in seconds */
412    const double samplePeriod;
413
414    /** Address mask for sources of read accesses to be captured */
415    const Addr readAddrMask;
416
417    /** Address mask for sources of write accesses to be captured */
418    const Addr writeAddrMask;
419
420    /** Optional stack distance calculator */
421    StackDistCalc *const stackDistCalc;
422
423    /** The system in which the monitor lives */
424    System *const system;
425
426    /** @} */
427
428    /** Output stream for a potential trace. */
429    ProtoOutputStream *traceStream;
430
431    /** Instantiate stats */
432    MonitorStats stats;
433
434  protected: // Probe points
435    /**
436     * @{
437     * @name Memory system probe points
438     */
439
440    /** Successfully forwarded request packet */
441    ProbePoints::PacketUPtr ppPktReq;
442
443    /** Successfully forwarded response packet */
444    ProbePoints::PacketUPtr ppPktResp;
445
446    /** @} */
447};
448
449#endif //__MEM_COMM_MONITOR_HH__
450