mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-24 19:29:56 +01:00
82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
// Copyright 2018 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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"strconv"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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/*
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#include <sys/param.h>
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#include <sys/sched.h>
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*/
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import "C"
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type cpuCollector struct {
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cpu typedDesc
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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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func NewCpuCollector() (Collector, error) {
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return &cpuCollector{
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cpu: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "cpu", "seconds_total"),
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"Seconds the CPU spent in each mode.",
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[]string{"cpu", "mode"}, nil,
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), prometheus.CounterValue},
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}, nil
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}
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func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
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clockb, err := unix.SysctlRaw("kern.clockrate")
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if err != nil {
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return err
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}
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clock := *(*C.struct_clockinfo)(unsafe.Pointer(&clockb[0]))
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hz := float64(clock.stathz)
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ncpus, err := unix.SysctlUint32("hw.ncpu")
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if err != nil {
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return err
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}
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var cp_time [][C.CPUSTATES]C.int64_t
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for i := 0; i < int(ncpus); i++ {
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cp_timeb, err := unix.SysctlRaw("kern.cp_time2", i)
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if err != nil {
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return err
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}
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cp_time = append(cp_time, *(*[C.CPUSTATES]C.int64_t)(unsafe.Pointer(&cp_timeb[0])))
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}
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for cpu, time := range cp_time {
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lcpu := strconv.Itoa(cpu)
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ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_USER])/hz, lcpu, "user")
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ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_NICE])/hz, lcpu, "nice")
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ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_SYS])/hz, lcpu, "system")
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ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_INTR])/hz, lcpu, "interrupt")
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ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_IDLE])/hz, lcpu, "idle")
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}
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return err
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}
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