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178 lines
3.3 KiB
178 lines
3.3 KiB
/*
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ISC License
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Copyright (c) 2024, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "cpu.hpp"
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#include "ghc/filesystem.hpp"
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#include "fmt/core.h"
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#include <pthread.h>
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#include <sched.h>
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#include <fstream>
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int
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CPU::getaffinity(cpu_set_t *cpuset_)
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{
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const pid_t pid = 0;
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CPU_ZERO(cpuset_);
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return sched_getaffinity(pid,
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sizeof(cpu_set_t),
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cpuset_);
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}
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int
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CPU::setaffinity(const pthread_t thread_id_,
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cpu_set_t *cpuset_)
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{
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return pthread_setaffinity_np(thread_id_,
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sizeof(cpu_set_t),
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cpuset_);
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}
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int
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CPU::setaffinity(const pthread_t thread_id_,
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const int cpu_)
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{
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(cpu_,&cpuset);
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return CPU::setaffinity(thread_id_,&cpuset);
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}
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int
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CPU::setaffinity(const pthread_t thread_id_,
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const std::set<int> cpus_)
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{
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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for(auto const cpu : cpus_)
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CPU_SET(cpu,&cpuset);
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return CPU::setaffinity(thread_id_,&cpuset);
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}
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static
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ghc::filesystem::path
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generate_cpu_core_id_path(const int cpu_id_)
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{
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const ghc::filesystem::path basepath{"/sys/devices/system/cpu"};
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return basepath / fmt::format("cpu{}",cpu_id_) / "topology" / "core_id";
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}
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int
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CPU::count()
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{
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int rv;
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cpu_set_t cpuset;
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rv = CPU::getaffinity(&cpuset);
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if(rv < 0)
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return rv;
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return CPU_COUNT(&cpuset);
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}
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CPU::CPUVec
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CPU::cpus()
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{
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cpu_set_t cpuset;
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CPU::CPUVec cpuvec;
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CPU::getaffinity(&cpuset);
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for(int i = 0; i < CPU_SETSIZE; i++)
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{
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if(!CPU_ISSET(i,&cpuset))
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continue;
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cpuvec.push_back(i);
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}
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return cpuvec;
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}
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CPU::CPU2CoreMap
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CPU::cpu2core()
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{
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cpu_set_t cpuset;
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CPU::CPU2CoreMap c2c;
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CPU::getaffinity(&cpuset);
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for(int i = 0; i < CPU_SETSIZE; i++)
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{
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int core_id;
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std::ifstream ifs;
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ghc::filesystem::path path;
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if(!CPU_ISSET(i,&cpuset))
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continue;
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path = ::generate_cpu_core_id_path(i);
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ifs.open(path);
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if(!ifs)
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break;
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ifs >> core_id;
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c2c[i] = core_id;
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ifs.close();
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}
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return c2c;
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}
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CPU::Core2CPUsMap
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CPU::core2cpus()
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{
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cpu_set_t cpuset;
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CPU::Core2CPUsMap c2c;
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CPU::getaffinity(&cpuset);
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for(int i = 0; i < CPU_SETSIZE; i++)
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{
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int core_id;
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std::ifstream ifs;
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ghc::filesystem::path path;
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if(!CPU_ISSET(i,&cpuset))
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continue;
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path = ::generate_cpu_core_id_path(i);
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ifs.open(path);
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if(!ifs)
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break;
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ifs >> core_id;
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c2c[core_id].insert(i);
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ifs.close();
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}
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return c2c;
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}
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