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// Copyright 2019 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 !nocpu
package collector
import (
"fmt"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/sysfs"
)
type cpuFreqCollector struct {
fs sysfs.FS
cpuFreq *prometheus.Desc
cpuFreqMin *prometheus.Desc
cpuFreqMax *prometheus.Desc
scalingFreq *prometheus.Desc
scalingFreqMin *prometheus.Desc
scalingFreqMax *prometheus.Desc
logger log.Logger
}
func init() {
registerCollector("cpufreq", defaultEnabled, NewCPUFreqCollector)
}
// NewCPUFreqCollector returns a new Collector exposing kernel/system statistics.
func NewCPUFreqCollector(logger log.Logger) (Collector, error) {
fs, err := sysfs.NewFS(*sysPath)
if err != nil {
return nil, fmt.Errorf("failed to open sysfs: %w", err)
}
return &cpuFreqCollector{
fs: fs,
cpuFreq: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_hertz"),
"Current cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
cpuFreqMin: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_min_hertz"),
"Minimum cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
cpuFreqMax: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_max_hertz"),
"Maximum cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
scalingFreq: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "scaling_frequency_hertz"),
"Current scaled cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
scalingFreqMin: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "scaling_frequency_min_hertz"),
"Minimum scaled cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
scalingFreqMax: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "scaling_frequency_max_hertz"),
"Maximum scaled cpu thread frequency in hertz.",
[]string{"cpu"}, nil,
),
logger: logger,
}, nil
}
// Update implements Collector and exposes cpu related metrics from /proc/stat and /sys/.../cpu/.
func (c *cpuFreqCollector) Update(ch chan<- prometheus.Metric) error {
cpuFreqs, err := c.fs.SystemCpufreq()
if err != nil {
return err
}
// sysfs cpufreq values are kHz, thus multiply by 1000 to export base units (hz).
// See https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt
for _, stats := range cpuFreqs {
if stats.CpuinfoCurrentFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.cpuFreq,
prometheus.GaugeValue,
float64(*stats.CpuinfoCurrentFrequency)*1000.0,
stats.Name,
)
}
if stats.CpuinfoMinimumFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.cpuFreqMin,
prometheus.GaugeValue,
float64(*stats.CpuinfoMinimumFrequency)*1000.0,
stats.Name,
)
}
if stats.CpuinfoMaximumFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.cpuFreqMax,
prometheus.GaugeValue,
float64(*stats.CpuinfoMaximumFrequency)*1000.0,
stats.Name,
)
}
if stats.ScalingCurrentFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.scalingFreq,
prometheus.GaugeValue,
float64(*stats.ScalingCurrentFrequency)*1000.0,
stats.Name,
)
}
if stats.ScalingMinimumFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.scalingFreqMin,
prometheus.GaugeValue,
float64(*stats.ScalingMinimumFrequency)*1000.0,
stats.Name,
)
}
if stats.ScalingMaximumFrequency != nil {
ch <- prometheus.MustNewConstMetric(
c.scalingFreqMax,
prometheus.GaugeValue,
float64(*stats.ScalingMaximumFrequency)*1000.0,
stats.Name,
)
}
}
return nil
}
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