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// 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
}
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