| // Copyright 2018 The Prometheus Authors |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // +build !windows |
| |
| package sysfs |
| |
| import ( |
| "fmt" |
| "os" |
| "path/filepath" |
| "strings" |
| |
| "github.com/prometheus/procfs/internal/util" |
| ) |
| |
| // SystemCPUCpufreqStats contains stats from devices/system/cpu/cpu[0-9]*/cpufreq/... |
| type SystemCPUCpufreqStats struct { |
| Name string |
| CurrentFrequency uint64 |
| MinimumFrequency uint64 |
| MaximumFrequency uint64 |
| TransitionLatency uint64 |
| AvailableGovernors string |
| Driver string |
| Govenor string |
| RelatedCpus string |
| SetSpeed string |
| } |
| |
| // TODO: Add topology support. |
| |
| // TODO: Add thermal_throttle support. |
| |
| // NewSystemCpufreq returns CPU frequency metrics for all CPUs. |
| func NewSystemCpufreq() ([]SystemCPUCpufreqStats, error) { |
| fs, err := NewFS(DefaultMountPoint) |
| if err != nil { |
| return []SystemCPUCpufreqStats{}, err |
| } |
| |
| return fs.NewSystemCpufreq() |
| } |
| |
| // NewSystemCpufreq returns CPU frequency metrics for all CPUs. |
| func (fs FS) NewSystemCpufreq() ([]SystemCPUCpufreqStats, error) { |
| var cpufreq = &SystemCPUCpufreqStats{} |
| |
| cpus, err := filepath.Glob(fs.Path("devices/system/cpu/cpu[0-9]*")) |
| if err != nil { |
| return []SystemCPUCpufreqStats{}, err |
| } |
| |
| systemCpufreq := []SystemCPUCpufreqStats{} |
| for _, cpu := range cpus { |
| cpuName := filepath.Base(cpu) |
| cpuNum := strings.TrimPrefix(cpuName, "cpu") |
| |
| cpuCpufreqPath := filepath.Join(cpu, "cpufreq") |
| if _, err := os.Stat(cpuCpufreqPath); os.IsNotExist(err) { |
| continue |
| } |
| if err != nil { |
| return []SystemCPUCpufreqStats{}, err |
| } |
| |
| if _, err = os.Stat(filepath.Join(cpuCpufreqPath, "scaling_cur_freq")); err == nil { |
| cpufreq, err = parseCpufreqCpuinfo("scaling", cpuCpufreqPath) |
| } else if _, err = os.Stat(filepath.Join(cpuCpufreqPath, "cpuinfo_cur_freq")); err == nil { |
| // Older kernels have metrics named `cpuinfo_...`. |
| cpufreq, err = parseCpufreqCpuinfo("cpuinfo", cpuCpufreqPath) |
| } else { |
| return []SystemCPUCpufreqStats{}, fmt.Errorf("CPU %v is missing cpufreq", cpu) |
| } |
| if err != nil { |
| return []SystemCPUCpufreqStats{}, err |
| } |
| cpufreq.Name = cpuNum |
| systemCpufreq = append(systemCpufreq, *cpufreq) |
| } |
| |
| return systemCpufreq, nil |
| } |
| |
| func parseCpufreqCpuinfo(prefix string, cpuPath string) (*SystemCPUCpufreqStats, error) { |
| uintFiles := []string{ |
| prefix + "_cur_freq", |
| prefix + "_max_freq", |
| prefix + "_min_freq", |
| "cpuinfo_transition_latency", |
| } |
| uintOut := make([]uint64, len(uintFiles)) |
| |
| for i, f := range uintFiles { |
| v, err := util.ReadUintFromFile(filepath.Join(cpuPath, f)) |
| if err != nil { |
| return &SystemCPUCpufreqStats{}, err |
| } |
| |
| uintOut[i] = v |
| } |
| |
| stringFiles := []string{ |
| "scaling_available_governors", |
| "scaling_driver", |
| "scaling_governor", |
| "related_cpus", |
| "scaling_setspeed", |
| } |
| stringOut := make([]string, len(stringFiles)) |
| var err error |
| |
| for i, f := range stringFiles { |
| stringOut[i], err = util.SysReadFile(filepath.Join(cpuPath, f)) |
| if err != nil { |
| return &SystemCPUCpufreqStats{}, err |
| } |
| } |
| |
| return &SystemCPUCpufreqStats{ |
| CurrentFrequency: uintOut[0], |
| MaximumFrequency: uintOut[1], |
| MinimumFrequency: uintOut[2], |
| TransitionLatency: uintOut[3], |
| AvailableGovernors: stringOut[0], |
| Driver: stringOut[1], |
| Govenor: stringOut[2], |
| RelatedCpus: stringOut[3], |
| SetSpeed: stringOut[4], |
| }, nil |
| } |