mirror of https://github.com/trapexit/mergerfs.git
164 lines
2.6 KiB
C++
164 lines
2.6 KiB
C++
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE
|
|
#endif
|
|
|
|
#include "cpu.hpp"
|
|
#include "ghc/filesystem.hpp"
|
|
#include "fmt/core.h"
|
|
|
|
#include <sched.h>
|
|
|
|
#include <fstream>
|
|
|
|
|
|
int
|
|
CPU::getaffinity(const pthread_t thread_id_,
|
|
cpu_set_t *cpuset_)
|
|
{
|
|
CPU_ZERO(cpuset_);
|
|
return sched_getaffinity(thread_id_,
|
|
sizeof(cpu_set_t),
|
|
cpuset_);
|
|
}
|
|
|
|
int
|
|
CPU::setaffinity(const pthread_t thread_id_,
|
|
cpu_set_t *cpuset_)
|
|
{
|
|
return pthread_setaffinity_np(thread_id_,
|
|
sizeof(cpu_set_t),
|
|
cpuset_);
|
|
}
|
|
|
|
int
|
|
CPU::setaffinity(const pthread_t thread_id_,
|
|
const int cpu_)
|
|
{
|
|
cpu_set_t cpuset;
|
|
|
|
CPU_ZERO(&cpuset);
|
|
CPU_SET(cpu_,&cpuset);
|
|
|
|
return CPU::setaffinity(thread_id_,&cpuset);
|
|
}
|
|
|
|
int
|
|
CPU::setaffinity(const pthread_t thread_id_,
|
|
const std::set<int> cpus_)
|
|
{
|
|
cpu_set_t cpuset;
|
|
|
|
CPU_ZERO(&cpuset);
|
|
for(auto const cpu : cpus_)
|
|
CPU_SET(cpu,&cpuset);
|
|
|
|
return CPU::setaffinity(thread_id_,&cpuset);
|
|
}
|
|
|
|
static
|
|
ghc::filesystem::path
|
|
generate_cpu_core_id_path(const int cpu_id_)
|
|
{
|
|
const ghc::filesystem::path basepath{"/sys/devices/system/cpu"};
|
|
|
|
return basepath / fmt::format("cpu{}",cpu_id_) / "topology" / "core_id";
|
|
}
|
|
|
|
int
|
|
CPU::count()
|
|
{
|
|
int rv;
|
|
cpu_set_t cpuset;
|
|
|
|
rv = CPU::getaffinity(0,&cpuset);
|
|
if(rv < 0)
|
|
return rv;
|
|
|
|
return CPU_COUNT(&cpuset);
|
|
}
|
|
|
|
CPU::CPUVec
|
|
CPU::cpus()
|
|
{
|
|
cpu_set_t cpuset;
|
|
CPU::CPUVec cpuvec;
|
|
|
|
CPU::getaffinity(0,&cpuset);
|
|
|
|
for(int i = 0; i < CPU_SETSIZE; i++)
|
|
{
|
|
if(!CPU_ISSET(i,&cpuset))
|
|
continue;
|
|
|
|
cpuvec.push_back(i);
|
|
}
|
|
|
|
return cpuvec;
|
|
}
|
|
|
|
CPU::CPU2CoreMap
|
|
CPU::cpu2core()
|
|
{
|
|
cpu_set_t cpuset;
|
|
CPU::CPU2CoreMap c2c;
|
|
|
|
CPU::getaffinity(0,&cpuset);
|
|
|
|
for(int i = 0; i < CPU_SETSIZE; i++)
|
|
{
|
|
int core_id;
|
|
std::ifstream ifs;
|
|
ghc::filesystem::path path;
|
|
|
|
if(!CPU_ISSET(i,&cpuset))
|
|
continue;
|
|
|
|
path = ::generate_cpu_core_id_path(i);
|
|
|
|
ifs.open(path);
|
|
if(!ifs)
|
|
break;
|
|
|
|
ifs >> core_id;
|
|
|
|
c2c[i] = core_id;
|
|
|
|
ifs.close();
|
|
}
|
|
|
|
return c2c;
|
|
}
|
|
|
|
CPU::Core2CPUsMap
|
|
CPU::core2cpus()
|
|
{
|
|
cpu_set_t cpuset;
|
|
CPU::Core2CPUsMap c2c;
|
|
|
|
CPU::getaffinity(0,&cpuset);
|
|
|
|
for(int i = 0; i < CPU_SETSIZE; i++)
|
|
{
|
|
int core_id;
|
|
std::ifstream ifs;
|
|
ghc::filesystem::path path;
|
|
|
|
if(!CPU_ISSET(i,&cpuset))
|
|
continue;
|
|
|
|
path = ::generate_cpu_core_id_path(i);
|
|
|
|
ifs.open(path);
|
|
if(!ifs)
|
|
break;
|
|
|
|
ifs >> core_id;
|
|
|
|
c2c[core_id].insert(i);
|
|
|
|
ifs.close();
|
|
}
|
|
|
|
return c2c;
|
|
}
|