base.cc revision 12637:bfc3cb9c7e6c 
1/*
2 * Copyright (c) 2013,2016 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 * Copyright (c) 2003-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Erik Hallnor
41 *          Ron Dreslinski
42 */
43
44/**
45 * @file
46 * Definitions of BaseTags.
47 */
48
49#include "mem/cache/tags/base.hh"
50
51#include "cpu/smt.hh" //maxThreadsPerCPU
52#include "mem/cache/base.hh"
53#include "sim/sim_exit.hh"
54
55BaseTags::BaseTags(const Params *p)
56    : ClockedObject(p), blkSize(p->block_size), blkMask(blkSize - 1),
57      size(p->size),
58      lookupLatency(p->tag_latency),
59      accessLatency(p->sequential_access ?
60                    p->tag_latency + p->data_latency :
61                    std::max(p->tag_latency, p->data_latency)),
62      cache(nullptr),
63      warmupBound((p->warmup_percentage/100.0) * (p->size / p->block_size)),
64      warmedUp(false), numBlocks(p->size / p->block_size),
65      dataBlks(new uint8_t[p->size]) // Allocate data storage in one big chunk
66{
67}
68
69void
70BaseTags::setCache(BaseCache *_cache)
71{
72    assert(!cache);
73    cache = _cache;
74}
75
76void
77BaseTags::insertBlock(PacketPtr pkt, CacheBlk *blk)
78{
79    // Get address
80    Addr addr = pkt->getAddr();
81
82    // Update warmup data
83    if (!blk->isTouched) {
84        if (!warmedUp && tagsInUse.value() >= warmupBound) {
85            warmedUp = true;
86            warmupCycle = curTick();
87        }
88    }
89
90    // If we're replacing a block that was previously valid update
91    // stats for it. This can't be done in findBlock() because a
92    // found block might not actually be replaced there if the
93    // coherence protocol says it can't be.
94    if (blk->isValid()) {
95        replacements[0]++;
96        totalRefs += blk->refCount;
97        ++sampledRefs;
98
99        invalidate(blk);
100        blk->invalidate();
101    }
102
103    // Previous block, if existed, has been removed, and now we have
104    // to insert the new one
105    tagsInUse++;
106
107    // Set tag for new block.  Caller is responsible for setting status.
108    blk->tag = extractTag(addr);
109
110    // Deal with what we are bringing in
111    MasterID master_id = pkt->req->masterId();
112    assert(master_id < cache->system->maxMasters());
113    occupancies[master_id]++;
114    blk->srcMasterId = master_id;
115
116    // Set task id
117    blk->task_id = pkt->req->taskId();
118
119    // We only need to write into one tag and one data block.
120    tagAccesses += 1;
121    dataAccesses += 1;
122}
123
124void
125BaseTags::regStats()
126{
127    ClockedObject::regStats();
128
129    using namespace Stats;
130
131    replacements
132        .init(maxThreadsPerCPU)
133        .name(name() + ".replacements")
134        .desc("number of replacements")
135        .flags(total)
136        ;
137
138    tagsInUse
139        .name(name() + ".tagsinuse")
140        .desc("Cycle average of tags in use")
141        ;
142
143    totalRefs
144        .name(name() + ".total_refs")
145        .desc("Total number of references to valid blocks.")
146        ;
147
148    sampledRefs
149        .name(name() + ".sampled_refs")
150        .desc("Sample count of references to valid blocks.")
151        ;
152
153    avgRefs
154        .name(name() + ".avg_refs")
155        .desc("Average number of references to valid blocks.")
156        ;
157
158    avgRefs = totalRefs/sampledRefs;
159
160    warmupCycle
161        .name(name() + ".warmup_cycle")
162        .desc("Cycle when the warmup percentage was hit.")
163        ;
164
165    occupancies
166        .init(cache->system->maxMasters())
167        .name(name() + ".occ_blocks")
168        .desc("Average occupied blocks per requestor")
169        .flags(nozero | nonan)
170        ;
171    for (int i = 0; i < cache->system->maxMasters(); i++) {
172        occupancies.subname(i, cache->system->getMasterName(i));
173    }
174
175    avgOccs
176        .name(name() + ".occ_percent")
177        .desc("Average percentage of cache occupancy")
178        .flags(nozero | total)
179        ;
180    for (int i = 0; i < cache->system->maxMasters(); i++) {
181        avgOccs.subname(i, cache->system->getMasterName(i));
182    }
183
184    avgOccs = occupancies / Stats::constant(numBlocks);
185
186    occupanciesTaskId
187        .init(ContextSwitchTaskId::NumTaskId)
188        .name(name() + ".occ_task_id_blocks")
189        .desc("Occupied blocks per task id")
190        .flags(nozero | nonan)
191        ;
192
193    ageTaskId
194        .init(ContextSwitchTaskId::NumTaskId, 5)
195        .name(name() + ".age_task_id_blocks")
196        .desc("Occupied blocks per task id")
197        .flags(nozero | nonan)
198        ;
199
200    percentOccsTaskId
201        .name(name() + ".occ_task_id_percent")
202        .desc("Percentage of cache occupancy per task id")
203        .flags(nozero)
204        ;
205
206    percentOccsTaskId = occupanciesTaskId / Stats::constant(numBlocks);
207
208    tagAccesses
209        .name(name() + ".tag_accesses")
210        .desc("Number of tag accesses")
211        ;
212
213    dataAccesses
214        .name(name() + ".data_accesses")
215        .desc("Number of data accesses")
216        ;
217
218    registerDumpCallback(new BaseTagsDumpCallback(this));
219    registerExitCallback(new BaseTagsCallback(this));
220}
221