base.cc revision 12684:44ebd2bc020f
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 // Touch block 104 blk->isTouched = true; 105 blk->refCount = 1; 106 blk->tickInserted = curTick(); 107 108 // Previous block, if existed, has been removed, and now we have 109 // to insert the new one 110 tagsInUse++; 111 112 // Set tag for new block. Caller is responsible for setting status. 113 blk->tag = extractTag(addr); 114 115 // Deal with what we are bringing in 116 MasterID master_id = pkt->req->masterId(); 117 assert(master_id < cache->system->maxMasters()); 118 occupancies[master_id]++; 119 blk->srcMasterId = master_id; 120 121 // Set task id 122 blk->task_id = pkt->req->taskId(); 123 124 // We only need to write into one tag and one data block. 125 tagAccesses += 1; 126 dataAccesses += 1; 127} 128 129void 130BaseTags::regStats() 131{ 132 ClockedObject::regStats(); 133 134 using namespace Stats; 135 136 replacements 137 .init(maxThreadsPerCPU) 138 .name(name() + ".replacements") 139 .desc("number of replacements") 140 .flags(total) 141 ; 142 143 tagsInUse 144 .name(name() + ".tagsinuse") 145 .desc("Cycle average of tags in use") 146 ; 147 148 totalRefs 149 .name(name() + ".total_refs") 150 .desc("Total number of references to valid blocks.") 151 ; 152 153 sampledRefs 154 .name(name() + ".sampled_refs") 155 .desc("Sample count of references to valid blocks.") 156 ; 157 158 avgRefs 159 .name(name() + ".avg_refs") 160 .desc("Average number of references to valid blocks.") 161 ; 162 163 avgRefs = totalRefs/sampledRefs; 164 165 warmupCycle 166 .name(name() + ".warmup_cycle") 167 .desc("Cycle when the warmup percentage was hit.") 168 ; 169 170 occupancies 171 .init(cache->system->maxMasters()) 172 .name(name() + ".occ_blocks") 173 .desc("Average occupied blocks per requestor") 174 .flags(nozero | nonan) 175 ; 176 for (int i = 0; i < cache->system->maxMasters(); i++) { 177 occupancies.subname(i, cache->system->getMasterName(i)); 178 } 179 180 avgOccs 181 .name(name() + ".occ_percent") 182 .desc("Average percentage of cache occupancy") 183 .flags(nozero | total) 184 ; 185 for (int i = 0; i < cache->system->maxMasters(); i++) { 186 avgOccs.subname(i, cache->system->getMasterName(i)); 187 } 188 189 avgOccs = occupancies / Stats::constant(numBlocks); 190 191 occupanciesTaskId 192 .init(ContextSwitchTaskId::NumTaskId) 193 .name(name() + ".occ_task_id_blocks") 194 .desc("Occupied blocks per task id") 195 .flags(nozero | nonan) 196 ; 197 198 ageTaskId 199 .init(ContextSwitchTaskId::NumTaskId, 5) 200 .name(name() + ".age_task_id_blocks") 201 .desc("Occupied blocks per task id") 202 .flags(nozero | nonan) 203 ; 204 205 percentOccsTaskId 206 .name(name() + ".occ_task_id_percent") 207 .desc("Percentage of cache occupancy per task id") 208 .flags(nozero) 209 ; 210 211 percentOccsTaskId = occupanciesTaskId / Stats::constant(numBlocks); 212 213 tagAccesses 214 .name(name() + ".tag_accesses") 215 .desc("Number of tag accesses") 216 ; 217 218 dataAccesses 219 .name(name() + ".data_accesses") 220 .desc("Number of data accesses") 221 ; 222 223 registerDumpCallback(new BaseTagsDumpCallback(this)); 224 registerExitCallback(new BaseTagsCallback(this)); 225} 226