base.cc revision 12691:8e1371fde4be
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 // Deal with what we are bringing in 108 MasterID master_id = pkt->req->masterId(); 109 assert(master_id < cache->system->maxMasters()); 110 occupancies[master_id]++; 111 112 // Insert block with tag, src master id and task id 113 blk->insert(extractTag(addr), pkt->isSecure(), master_id, 114 pkt->req->taskId()); 115 116 // We only need to write into one tag and one data block. 117 tagAccesses += 1; 118 dataAccesses += 1; 119} 120 121void 122BaseTags::regStats() 123{ 124 ClockedObject::regStats(); 125 126 using namespace Stats; 127 128 replacements 129 .init(maxThreadsPerCPU) 130 .name(name() + ".replacements") 131 .desc("number of replacements") 132 .flags(total) 133 ; 134 135 tagsInUse 136 .name(name() + ".tagsinuse") 137 .desc("Cycle average of tags in use") 138 ; 139 140 totalRefs 141 .name(name() + ".total_refs") 142 .desc("Total number of references to valid blocks.") 143 ; 144 145 sampledRefs 146 .name(name() + ".sampled_refs") 147 .desc("Sample count of references to valid blocks.") 148 ; 149 150 avgRefs 151 .name(name() + ".avg_refs") 152 .desc("Average number of references to valid blocks.") 153 ; 154 155 avgRefs = totalRefs/sampledRefs; 156 157 warmupCycle 158 .name(name() + ".warmup_cycle") 159 .desc("Cycle when the warmup percentage was hit.") 160 ; 161 162 occupancies 163 .init(cache->system->maxMasters()) 164 .name(name() + ".occ_blocks") 165 .desc("Average occupied blocks per requestor") 166 .flags(nozero | nonan) 167 ; 168 for (int i = 0; i < cache->system->maxMasters(); i++) { 169 occupancies.subname(i, cache->system->getMasterName(i)); 170 } 171 172 avgOccs 173 .name(name() + ".occ_percent") 174 .desc("Average percentage of cache occupancy") 175 .flags(nozero | total) 176 ; 177 for (int i = 0; i < cache->system->maxMasters(); i++) { 178 avgOccs.subname(i, cache->system->getMasterName(i)); 179 } 180 181 avgOccs = occupancies / Stats::constant(numBlocks); 182 183 occupanciesTaskId 184 .init(ContextSwitchTaskId::NumTaskId) 185 .name(name() + ".occ_task_id_blocks") 186 .desc("Occupied blocks per task id") 187 .flags(nozero | nonan) 188 ; 189 190 ageTaskId 191 .init(ContextSwitchTaskId::NumTaskId, 5) 192 .name(name() + ".age_task_id_blocks") 193 .desc("Occupied blocks per task id") 194 .flags(nozero | nonan) 195 ; 196 197 percentOccsTaskId 198 .name(name() + ".occ_task_id_percent") 199 .desc("Percentage of cache occupancy per task id") 200 .flags(nozero) 201 ; 202 203 percentOccsTaskId = occupanciesTaskId / Stats::constant(numBlocks); 204 205 tagAccesses 206 .name(name() + ".tag_accesses") 207 .desc("Number of tag accesses") 208 ; 209 210 dataAccesses 211 .name(name() + ".data_accesses") 212 .desc("Number of data accesses") 213 ; 214 215 registerDumpCallback(new BaseTagsDumpCallback(this)); 216 registerExitCallback(new BaseTagsCallback(this)); 217} 218