278 lines
6.6 KiB
Go
278 lines
6.6 KiB
Go
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// Copyright 2023 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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"errors"
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"math"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"unsafe"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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"howett.net/plist"
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)
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type clockinfo struct {
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hz int32 // clock frequency
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tick int32 // micro-seconds per hz tick
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spare int32
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stathz int32 // statistics clock frequency
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profhz int32 // profiling clock frequency
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}
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type cputime struct {
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user float64
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nice float64
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sys float64
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intr float64
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idle float64
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}
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type plistref struct {
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pref_plist unsafe.Pointer
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pref_len uint64
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}
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type sysmonValues struct {
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CurValue int `plist:"cur-value"`
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Description string `plist:"description"`
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State string `plist:"state"`
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Type string `plist:"type"`
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}
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type sysmonProperty []sysmonValues
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type sysmonProperties map[string]sysmonProperty
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func readBytes(ptr unsafe.Pointer, length uint64) []byte {
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buf := make([]byte, length-1)
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var i uint64
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for ; i < length-1; i++ {
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buf[i] = *(*byte)(unsafe.Pointer(uintptr(ptr) + uintptr(i)))
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}
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return buf
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}
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func ioctl(fd int, nr int64, typ byte, size uintptr, retptr unsafe.Pointer) error {
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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uintptr(fd),
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// Some magicks derived from sys/ioccom.h.
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uintptr((0x40000000|0x80000000)|
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((int64(size)&(1<<13-1))<<16)|
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(int64(typ)<<8)|
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nr,
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),
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uintptr(retptr),
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)
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if errno != 0 {
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return errno
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}
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return nil
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}
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func readSysmonProperties() (sysmonProperties, error) {
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fd, err := unix.Open(rootfsFilePath("/dev/sysmon"), unix.O_RDONLY, 0777)
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if err != nil {
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return nil, err
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}
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defer unix.Close(fd)
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var retptr plistref
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if err = ioctl(fd, 0, 'E', unsafe.Sizeof(retptr), unsafe.Pointer(&retptr)); err != nil {
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return nil, err
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}
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bytes := readBytes(retptr.pref_plist, retptr.pref_len)
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var props sysmonProperties
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if _, err = plist.Unmarshal(bytes, &props); err != nil {
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return nil, err
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}
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return props, nil
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}
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func sortFilterSysmonProperties(props sysmonProperties, prefix string) []string {
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var keys []string
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for key := range props {
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if !strings.HasPrefix(key, prefix) {
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continue
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}
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keys = append(keys, key)
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}
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sort.Strings(keys)
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return keys
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}
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func convertTemperatures(prop sysmonProperty, res map[int]float64) error {
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for _, val := range prop {
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if val.State == "invalid" || val.State == "unknown" || val.State == "" {
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continue
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}
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re := regexp.MustCompile("^cpu([0-9]+) temperature$")
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core := re.FindStringSubmatch(val.Description)[1]
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ncore, _ := strconv.Atoi(core)
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temperature := ((float64(uint64(val.CurValue))) / 1000000) - 273.15
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res[ncore] = temperature
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}
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return nil
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}
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func getCPUTemperatures() (map[int]float64, error) {
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res := make(map[int]float64)
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// Read all properties
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props, err := readSysmonProperties()
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if err != nil {
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return res, err
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}
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keys := sortFilterSysmonProperties(props, "coretemp")
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for idx, _ := range keys {
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convertTemperatures(props[keys[idx]], res)
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}
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return res, nil
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}
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func getCPUTimes() ([]cputime, error) {
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const states = 5
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clockb, err := unix.SysctlRaw("kern.clockrate")
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if err != nil {
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return nil, err
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}
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clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
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var cpufreq float64
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if clock.stathz > 0 {
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cpufreq = float64(clock.stathz)
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} else {
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cpufreq = float64(clock.hz)
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}
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ncpusb, err := unix.SysctlRaw("hw.ncpu")
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if err != nil {
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return nil, err
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}
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ncpus := *(*int)(unsafe.Pointer(&ncpusb[0]))
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if ncpus < 1 {
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return nil, errors.New("Invalid cpu number")
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}
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var times []float64
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for ncpu := 0; ncpu < ncpus; ncpu++ {
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cpb, err := unix.SysctlRaw("kern.cp_time", ncpu)
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if err != nil {
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return nil, err
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}
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for len(cpb) >= int(unsafe.Sizeof(int(0))) {
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t := *(*int)(unsafe.Pointer(&cpb[0]))
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times = append(times, float64(t)/cpufreq)
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cpb = cpb[unsafe.Sizeof(int(0)):]
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}
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}
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cpus := make([]cputime, len(times)/states)
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for i := 0; i < len(times); i += states {
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cpu := &cpus[i/states]
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cpu.user = times[i]
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cpu.nice = times[i+1]
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cpu.sys = times[i+2]
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cpu.intr = times[i+3]
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cpu.idle = times[i+4]
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}
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return cpus, nil
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}
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type statCollector struct {
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cpu typedDesc
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temp typedDesc
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logger log.Logger
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}
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func init() {
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registerCollector("cpu", defaultEnabled, NewStatCollector)
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}
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// NewStatCollector returns a new Collector exposing CPU stats.
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func NewStatCollector(logger log.Logger) (Collector, error) {
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return &statCollector{
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cpu: typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
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temp: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "temperature_celsius"),
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"CPU temperature",
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[]string{"cpu"}, nil,
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), prometheus.GaugeValue},
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logger: logger,
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}, nil
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}
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// Expose CPU stats using sysctl.
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func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
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// We want time spent per-cpu per CPUSTATE.
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// CPUSTATES (number of CPUSTATES) is defined as 5U.
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// Order: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
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// sysctl kern.cp_time.x provides CPUSTATES long integers:
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// (space-separated list of the above variables, where
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// x stands for the number of the CPU core)
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//
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// Each value is a counter incremented at frequency
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// kern.clockrate.(stathz | hz)
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//
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// Look into sys/kern/kern_clock.c for details.
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cpuTimes, err := getCPUTimes()
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if err != nil {
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return err
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}
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cpuTemperatures, err := getCPUTemperatures()
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if err != nil {
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return err
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}
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for cpu, t := range cpuTimes {
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lcpu := strconv.Itoa(cpu)
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ch <- c.cpu.mustNewConstMetric(float64(t.user), lcpu, "user")
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ch <- c.cpu.mustNewConstMetric(float64(t.nice), lcpu, "nice")
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ch <- c.cpu.mustNewConstMetric(float64(t.sys), lcpu, "system")
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ch <- c.cpu.mustNewConstMetric(float64(t.intr), lcpu, "interrupt")
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ch <- c.cpu.mustNewConstMetric(float64(t.idle), lcpu, "idle")
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if temp, ok := cpuTemperatures[cpu]; ok {
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ch <- c.temp.mustNewConstMetric(temp, lcpu)
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} else {
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level.Debug(c.logger).Log("msg", "no temperature information for CPU", "cpu", cpu)
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ch <- c.temp.mustNewConstMetric(math.NaN(), lcpu)
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}
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}
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return err
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}
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