227 lines
8.0 KiB
Go
227 lines
8.0 KiB
Go
// Copyright 2015 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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// +build !nocpu
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package collector
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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"github.com/prometheus/procfs"
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)
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var (
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digitRegexp = regexp.MustCompile("[0-9]+")
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)
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type cpuCollector struct {
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cpu *prometheus.Desc
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cpuGuest *prometheus.Desc
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cpuFreq *prometheus.Desc
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cpuFreqMin *prometheus.Desc
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cpuFreqMax *prometheus.Desc
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cpuCoreThrottle *prometheus.Desc
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cpuPackageThrottle *prometheus.Desc
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}
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func init() {
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registerCollector("cpu", defaultEnabled, NewCPUCollector)
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}
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// NewCPUCollector returns a new Collector exposing kernel/system statistics.
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func NewCPUCollector() (Collector, error) {
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return &cpuCollector{
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cpu: nodeCpuSecondsDesc,
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cpuGuest: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "guest_seconds_total"),
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"Seconds the cpus spent in guests (VMs) for each mode.",
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[]string{"cpu", "mode"}, nil,
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),
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cpuFreq: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_hertz"),
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"Current cpu thread frequency in hertz.",
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[]string{"cpu"}, nil,
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),
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cpuFreqMin: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_min_hertz"),
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"Minimum cpu thread frequency in hertz.",
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[]string{"cpu"}, nil,
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),
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cpuFreqMax: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_max_hertz"),
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"Maximum cpu thread frequency in hertz.",
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[]string{"cpu"}, nil,
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),
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cpuCoreThrottle: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "core_throttles_total"),
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"Number of times this cpu core has been throttled.",
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[]string{"core"}, nil,
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),
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cpuPackageThrottle: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "package_throttles_total"),
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"Number of times this cpu package has been throttled.",
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[]string{"node"}, nil,
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),
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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 *cpuCollector) Update(ch chan<- prometheus.Metric) error {
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if err := c.updateStat(ch); err != nil {
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return err
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}
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if err := c.updateCPUfreq(ch); err != nil {
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return err
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}
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return nil
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}
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// updateCPUfreq reads /sys/bus/cpu/devices/cpu* and expose cpu frequency statistics.
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func (c *cpuCollector) updateCPUfreq(ch chan<- prometheus.Metric) error {
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cpus, err := filepath.Glob(sysFilePath("bus/cpu/devices/cpu[0-9]*"))
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if err != nil {
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return err
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}
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var value uint64
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cpu_core_throttles := make(map[int]uint64)
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// cpu loop
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for _, cpu := range cpus {
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_, cpuName := filepath.Split(cpu)
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cpuNum := strings.TrimPrefix(cpuName, "cpu")
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if _, err := os.Stat(filepath.Join(cpu, "cpufreq")); os.IsNotExist(err) {
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log.Debugf("CPU %v is missing cpufreq", cpu)
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} else {
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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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if value, err = readUintFromFile(filepath.Join(cpu, "cpufreq", "scaling_cur_freq")); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(c.cpuFreq, prometheus.GaugeValue, float64(value)*1000.0, cpuNum)
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if value, err = readUintFromFile(filepath.Join(cpu, "cpufreq", "scaling_min_freq")); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(c.cpuFreqMin, prometheus.GaugeValue, float64(value)*1000.0, cpuNum)
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if value, err = readUintFromFile(filepath.Join(cpu, "cpufreq", "scaling_max_freq")); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(c.cpuFreqMax, prometheus.GaugeValue, float64(value)*1000.0, cpuNum)
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}
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if _, err := os.Stat(filepath.Join(cpu, "thermal_throttle")); os.IsNotExist(err) {
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log.Debugf("CPU %v is missing thermal_throttle", cpu)
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continue
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}
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if value, err := readUintFromFile(filepath.Join(cpu, "topology/core_id")); err != nil {
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log.Debugf("CPU %v is misssing topology/core_id", cpu)
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} else {
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core_id := int(value)
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if value, err = readUintFromFile(filepath.Join(cpu, "thermal_throttle", "core_throttle_count")); err != nil {
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return err
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}
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cpu_core_throttles[core_id] = value
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}
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}
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// core throttles
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for core_id, value := range cpu_core_throttles {
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ch <- prometheus.MustNewConstMetric(c.cpuCoreThrottle, prometheus.CounterValue, float64(value), strconv.Itoa(core_id))
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}
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nodes, err := filepath.Glob(sysFilePath("bus/node/devices/node[0-9]*"))
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if err != nil {
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return err
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}
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// package / NUMA node loop
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for _, node := range nodes {
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if _, err := os.Stat(filepath.Join(node, "cpulist")); os.IsNotExist(err) {
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log.Debugf("NUMA node %v is missing cpulist", node)
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continue
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}
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cpulist, err := ioutil.ReadFile(filepath.Join(node, "cpulist"))
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if err != nil {
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log.Debugf("could not read cpulist of NUMA node %v", node)
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return err
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}
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// cpulist example of one package/node with HT: "0-11,24-35"
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line := strings.Split(string(cpulist), "\n")[0]
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if line == "" {
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// Skip processor-less (memory-only) NUMA nodes.
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// E.g. RAM expansion with Intel Optane Drive(s) using
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// Intel Memory Drive Technology (IMDT).
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log.Debugf("skipping processor-less (memory-only) NUMA node %v", node)
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continue
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}
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firstCPU := strings.FieldsFunc(line, func(r rune) bool {
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return r == '-' || r == ','
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})[0]
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if _, err := os.Stat(filepath.Join(node, "cpu"+firstCPU, "thermal_throttle", "package_throttle_count")); os.IsNotExist(err) {
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log.Debugf("Node %v CPU %v is missing package_throttle", node, firstCPU)
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continue
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}
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if value, err = readUintFromFile(filepath.Join(node, "cpu"+firstCPU, "thermal_throttle", "package_throttle_count")); err != nil {
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return err
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}
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nodeno := digitRegexp.FindAllString(node, 1)[0]
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ch <- prometheus.MustNewConstMetric(c.cpuPackageThrottle, prometheus.CounterValue, float64(value), nodeno)
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}
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return nil
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}
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// updateStat reads /proc/stat through procfs and exports cpu related metrics.
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func (c *cpuCollector) updateStat(ch chan<- prometheus.Metric) error {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return fmt.Errorf("failed to open procfs: %v", err)
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}
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stats, err := fs.NewStat()
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if err != nil {
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return err
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}
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for cpuID, cpuStat := range stats.CPU {
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cpuNum := fmt.Sprintf("%d", cpuID)
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.User, cpuNum, "user")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.Nice, cpuNum, "nice")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.System, cpuNum, "system")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.Idle, cpuNum, "idle")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.Iowait, cpuNum, "iowait")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.IRQ, cpuNum, "irq")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.SoftIRQ, cpuNum, "softirq")
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, cpuStat.Steal, cpuNum, "steal")
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// Guest CPU is also accounted for in cpuStat.User and cpuStat.Nice, expose these as separate metrics.
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ch <- prometheus.MustNewConstMetric(c.cpuGuest, prometheus.CounterValue, cpuStat.Guest, cpuNum, "user")
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ch <- prometheus.MustNewConstMetric(c.cpuGuest, prometheus.CounterValue, cpuStat.GuestNice, cpuNum, "nice")
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}
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return nil
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}
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