1 /* 2 Copyright (c) 2020, Intel Corporation 3 All rights reserved. 4 5 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 6 7 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 8 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 9 * Neither the name of Intel Corporation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 10 11 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 12 */ 13 // written by Roman Dementiev 14 15 #ifdef __linux__ 16 17 #include "resctrl.h" 18 #include "cpucounters.h" 19 #include <sys/stat.h> 20 #include <sys/types.h> 21 #include <string> 22 #include <iostream> 23 #include <cstdlib> 24 25 namespace pcm 26 { isMounted()27 bool Resctrl::isMounted() 28 { 29 struct stat st; 30 if (stat("/sys/fs/resctrl/mon_groups", &st) < 0) 31 { 32 return false; 33 } 34 return true; 35 } init()36 void Resctrl::init() 37 { 38 if (isMounted() == false) 39 { 40 std::cerr << "ERROR: /sys/fs/resctrl is not mounted\n"; 41 std::cerr << "ERROR: RDT metrics (L3OCC,LMB,RMB) will not be available\n"; 42 std::cerr << "Mount it to make it work: mount -t resctrl resctrl /sys/fs/resctrl\n"; 43 return; 44 } 45 const auto numCores = pcm.getNumCores(); 46 for (unsigned int c = 0; c < numCores; ++c) 47 { 48 if (pcm.isCoreOnline(c)) 49 { 50 const auto C = std::to_string(c); 51 const auto dir = std::string(PCMPath) + C; 52 struct stat st; 53 if (stat(dir.c_str(), &st) < 0 && mkdir(dir.c_str(), 0700) < 0) 54 { 55 std::cerr << "INFO: can't create directory " << dir << " error: " << strerror(errno) << "\n"; 56 const auto containerDir = std::string("/pcm") + dir; 57 if (stat(containerDir.c_str(), &st) < 0 && mkdir(containerDir.c_str(), 0700) < 0) 58 { 59 std::cerr << "INFO: can't create directory " << containerDir << " error: " << strerror(errno) << "\n"; 60 std::cerr << "ERROR: RDT metrics (L3OCC,LMB,RMB) will not be available\n"; 61 break; 62 } 63 } 64 const auto cpus_listFilename = dir + "/cpus_list"; 65 writeSysFS(cpus_listFilename.c_str(), C, false); 66 auto generateMetricFiles = [&dir, c] (PCM & pcm, const std::string & metric, FileMapType & fileMap) 67 { 68 auto getMetricFilename = [] (const std::string & dir, const uint64 s, const std::string & metric) 69 { 70 std::ostringstream ostr; 71 ostr << dir << "/mon_data/mon_L3_" << std::setfill('0') << std::setw(2) << s << "/" << metric; 72 return ostr.str(); 73 }; 74 for (uint64 s = 0; s < pcm.getNumSockets(); ++s) 75 { 76 fileMap[c].push_back(getMetricFilename(dir, s, metric)); 77 } 78 }; 79 if (pcm.L3CacheOccupancyMetricAvailable()) 80 { 81 generateMetricFiles(pcm, "llc_occupancy", L3OCC); 82 } 83 if (pcm.CoreLocalMemoryBWMetricAvailable()) 84 { 85 generateMetricFiles(pcm, "mbm_local_bytes", MBL); 86 } 87 if (pcm.CoreRemoteMemoryBWMetricAvailable()) 88 { 89 generateMetricFiles(pcm, "mbm_total_bytes", MBT); 90 } 91 } 92 } 93 } cleanup()94 void Resctrl::cleanup() 95 { 96 const auto numCores = pcm.getNumCores(); 97 for (unsigned int c = 0; c < numCores; ++c) 98 { 99 if (pcm.isCoreOnline(c)) 100 { 101 const auto dir = std::string(PCMPath) + std::to_string(c); 102 rmdir(dir.c_str()); 103 const auto containerDir = std::string("/pcm") + dir; 104 rmdir(containerDir.c_str()); 105 } 106 } 107 } getMetric(Resctrl::FileMapType & fileMap,int core)108 size_t Resctrl::getMetric(Resctrl::FileMapType & fileMap, int core) 109 { 110 auto files = fileMap[core]; 111 size_t result = 0; 112 for (auto f : files) 113 { 114 const auto data = readSysFS(f.c_str(), false); 115 if (data.empty() == false) 116 { 117 result += atoll(data.c_str()); 118 } 119 else 120 { 121 static std::mutex lock; 122 std::lock_guard<std::mutex> _(lock); 123 std::cerr << "Error reading " << f << ". Error: " << strerror(errno) << "\n"; 124 if (errno == 24) 125 { 126 std::cerr << "try executing 'ulimit -n 10000' to increase the limit on the number of open files.\n"; 127 } 128 } 129 } 130 return result; 131 } getL3OCC(int core)132 size_t Resctrl::getL3OCC(int core) 133 { 134 return getMetric(L3OCC, core); 135 } getMBL(int core)136 size_t Resctrl::getMBL(int core) 137 { 138 return getMetric(MBL, core); 139 } getMBT(int core)140 size_t Resctrl::getMBT(int core) 141 { 142 return getMetric(MBT, core); 143 } 144 }; 145 146 #endif // __linux__