224 lines
8.3 KiB
Go
224 lines
8.3 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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"os"
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"path/filepath"
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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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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{"package", "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{"package"}, 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/devices/system/cpu/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("devices/system/cpu/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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packageThrottles := make(map[uint64]uint64)
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packageCoreThrottles := make(map[uint64]map[uint64]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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// See
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// https://www.kernel.org/doc/Documentation/x86/topology.txt
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// https://www.kernel.org/doc/Documentation/cputopology.txt
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// https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu
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var err error
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var physicalPackageID, coreID uint64
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// topology/physical_package_id
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if physicalPackageID, err = readUintFromFile(filepath.Join(cpu, "topology", "physical_package_id")); err != nil {
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log.Debugf("CPU %v is missing physical_package_id", cpu)
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continue
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}
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// topology/core_id
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if coreID, err = readUintFromFile(filepath.Join(cpu, "topology", "core_id")); err != nil {
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log.Debugf("CPU %v is missing core_id", cpu)
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continue
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}
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// metric node_cpu_core_throttles_total
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//
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// We process this metric before the package throttles as there
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// are cpu+kernel combinations that only present core throttles
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// but no package throttles.
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// Seen e.g. on an Intel Xeon E5472 system with RHEL 6.9 kernel.
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if _, present := packageCoreThrottles[physicalPackageID]; !present {
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packageCoreThrottles[physicalPackageID] = make(map[uint64]uint64)
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}
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if _, present := packageCoreThrottles[physicalPackageID][coreID]; !present {
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// Read thermal_throttle/core_throttle_count only once
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if coreThrottleCount, err := readUintFromFile(filepath.Join(cpu, "thermal_throttle", "core_throttle_count")); err == nil {
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packageCoreThrottles[physicalPackageID][coreID] = coreThrottleCount
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} else {
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log.Debugf("CPU %v is missing core_throttle_count", cpu)
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}
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}
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// metric node_cpu_package_throttles_total
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if _, present := packageThrottles[physicalPackageID]; !present {
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// Read thermal_throttle/package_throttle_count only once
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if packageThrottleCount, err := readUintFromFile(filepath.Join(cpu, "thermal_throttle", "package_throttle_count")); err == nil {
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packageThrottles[physicalPackageID] = packageThrottleCount
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} else {
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log.Debugf("CPU %v is missing package_throttle_count", cpu)
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}
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}
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}
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for physicalPackageID, packageThrottleCount := range packageThrottles {
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ch <- prometheus.MustNewConstMetric(c.cpuPackageThrottle,
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prometheus.CounterValue,
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float64(packageThrottleCount),
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strconv.FormatUint(physicalPackageID, 10))
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}
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for physicalPackageID, coreMap := range packageCoreThrottles {
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for coreID, coreThrottleCount := range coreMap {
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ch <- prometheus.MustNewConstMetric(c.cpuCoreThrottle,
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prometheus.CounterValue,
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float64(coreThrottleCount),
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strconv.FormatUint(physicalPackageID, 10),
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strconv.FormatUint(coreID, 10))
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}
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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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