mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-04 07:51:04 +01:00
126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !nocpu
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// +build !nocpu
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package collector
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import (
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"fmt"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs/sysfs"
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"strings"
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)
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type cpuFreqCollector struct {
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fs sysfs.FS
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logger log.Logger
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}
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func init() {
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registerCollector("cpufreq", defaultEnabled, NewCPUFreqCollector)
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}
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// NewCPUFreqCollector returns a new Collector exposing kernel/system statistics.
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func NewCPUFreqCollector(logger log.Logger) (Collector, error) {
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fs, err := sysfs.NewFS(*sysPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open sysfs: %w", err)
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}
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return &cpuFreqCollector{
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fs: fs,
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logger: logger,
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}, nil
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}
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// Update implements Collector and exposes cpu related metrics from /proc/stat and /sys/.../cpu/.
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func (c *cpuFreqCollector) Update(ch chan<- prometheus.Metric) error {
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cpuFreqs, err := c.fs.SystemCpufreq()
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if err != nil {
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return err
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}
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// sysfs cpufreq values are kHz, thus multiply by 1000 to export base units (hz).
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// See https://www.kernel.org/doc/Documentation/cpu-freq/user-guide.txt
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for _, stats := range cpuFreqs {
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if stats.CpuinfoCurrentFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqHertzDesc,
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prometheus.GaugeValue,
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float64(*stats.CpuinfoCurrentFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.CpuinfoMinimumFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqMinDesc,
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prometheus.GaugeValue,
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float64(*stats.CpuinfoMinimumFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.CpuinfoMaximumFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqMaxDesc,
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prometheus.GaugeValue,
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float64(*stats.CpuinfoMaximumFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.ScalingCurrentFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqScalingFreqDesc,
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prometheus.GaugeValue,
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float64(*stats.ScalingCurrentFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.ScalingMinimumFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqScalingFreqMinDesc,
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prometheus.GaugeValue,
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float64(*stats.ScalingMinimumFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.ScalingMaximumFrequency != nil {
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ch <- prometheus.MustNewConstMetric(
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cpuFreqScalingFreqMaxDesc,
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prometheus.GaugeValue,
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float64(*stats.ScalingMaximumFrequency)*1000.0,
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stats.Name,
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)
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}
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if stats.Governor != "" {
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availableGovernors := strings.Split(stats.AvailableGovernors, " ")
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for _, g := range availableGovernors {
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state := 0
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if g == stats.Governor {
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state = 1
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}
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ch <- prometheus.MustNewConstMetric(
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cpuFreqScalingGovernorDesc,
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prometheus.GaugeValue,
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float64(state),
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stats.Name,
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g,
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)
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}
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}
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}
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return nil
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}
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