node_exporter/collector/cpu_openbsd.go

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// Copyright 2018 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nocpu
package collector
import (
"strconv"
"unsafe"
"github.com/go-kit/kit/log"
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"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
/*
#include <sys/param.h>
#include <sys/sched.h>
*/
import "C"
type cpuCollector struct {
cpu typedDesc
logger log.Logger
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}
func init() {
registerCollector("cpu", defaultEnabled, NewCPUCollector)
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}
func NewCPUCollector(logger log.Logger) (Collector, error) {
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return &cpuCollector{
cpu: typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
logger: logger,
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}, nil
}
func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
clockb, err := unix.SysctlRaw("kern.clockrate")
if err != nil {
return err
}
clock := *(*C.struct_clockinfo)(unsafe.Pointer(&clockb[0]))
hz := float64(clock.stathz)
ncpus, err := unix.SysctlUint32("hw.ncpu")
if err != nil {
return err
}
var cpTime [][C.CPUSTATES]C.int64_t
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for i := 0; i < int(ncpus); i++ {
cpb, err := unix.SysctlRaw("kern.cp_time2", i)
if err != nil && err != unix.ENODEV {
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return err
}
if err != unix.ENODEV {
cpTime = append(cpTime, *(*[C.CPUSTATES]C.int64_t)(unsafe.Pointer(&cpb[0])))
}
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}
for cpu, time := range cpTime {
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lcpu := strconv.Itoa(cpu)
ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_USER])/hz, lcpu, "user")
ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_NICE])/hz, lcpu, "nice")
ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_SYS])/hz, lcpu, "system")
ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_INTR])/hz, lcpu, "interrupt")
ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_IDLE])/hz, lcpu, "idle")
}
return err
}