mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-29 23:30:08 +01:00
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// +build !nocpu
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package collector
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import (
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"errors"
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"os"
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"strconv"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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)
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/*
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#cgo LDFLAGS: -lkvm
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#include <fcntl.h>
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#include <kvm.h>
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#include <sys/param.h>
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#include <sys/pcpu.h>
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#include <sys/resource.h>
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*/
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import "C"
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type statCollector struct {
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cpu *prometheus.CounterVec
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}
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func init() {
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Factories["cpu"] = NewStatCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// CPU stats.
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func NewStatCollector() (Collector, error) {
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return &statCollector{
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cpu: prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: Namespace,
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Name: "cpu_seconds_total",
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Help: "Seconds the CPU spent in each mode.",
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},
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[]string{"cpu", "mode"},
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),
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}, nil
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}
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// Expose CPU stats using KVM.
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func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
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if os.Geteuid() != 0 && os.Getegid() != 2 {
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return errors.New("caller should be either root user or kmem group to access /dev/mem")
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}
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var errbuf *C.char
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kd := C.kvm_open(nil, nil, nil, C.O_RDONLY, errbuf)
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if errbuf != nil {
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return errors.New("failed to call kvm_open().")
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}
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defer C.kvm_close(kd)
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ncpus := C.kvm_getncpus(kd)
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for i := 0; i < int(ncpus); i++ {
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pcpu := C.kvm_getpcpu(kd, C.int(i))
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cp_time := ((*C.struct_pcpu)(unsafe.Pointer(pcpu))).pc_cp_time
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "user"}).Set(float64(cp_time[C.CP_USER]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "nice"}).Set(float64(cp_time[C.CP_NICE]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "system"}).Set(float64(cp_time[C.CP_SYS]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "interrupt"}).Set(float64(cp_time[C.CP_INTR]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "idle"}).Set(float64(cp_time[C.CP_IDLE]))
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}
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c.cpu.Collect(ch)
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return err
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}
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