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https://github.com/prometheus/node_exporter.git
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9f820bd3ee
Starting with (not yet released) OpenBSD 6.4, sysctl KERN_CPTIME2 will return ENODEV for offline CPUs. SMT siblings are reported as offline when hw.smt is disabled, which is the default since one of the later Spectre variants. So this might affect a few systems. For more details see: https://cvsweb.openbsd.org/src/sys/kern/kern_sysctl.c#rev1.348 Signed-off-by: Ralf Horstmann <ralf+github@ackstorm.de>
80 lines
2.1 KiB
Go
80 lines
2.1 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{nodeCPUSecondsDesc, 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 && err != unix.ENODEV {
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return err
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}
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if err != unix.ENODEV {
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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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}
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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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