mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-09-20 08:07:31 -07:00
e942d7e234
Export cpu mode times as original uint64_t data, and update frequency, and do the conversion to float64 and subsequent division in go.
147 lines
3.6 KiB
Go
147 lines
3.6 KiB
Go
// Copyright 2015 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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"errors"
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"fmt"
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"strconv"
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"strings"
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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:
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#include <sys/sysctl.h>
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#include <kinfo.h>
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#include <stdlib.h>
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#include <stdio.h>
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int
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getCPUTimes(char **cputime, long *freq) {
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size_t len;
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// Get number of cpu cores.
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int mib[2];
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int ncpu;
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mib[0] = CTL_HW;
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mib[1] = HW_NCPU;
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len = sizeof(ncpu);
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if (sysctl(mib, 2, &ncpu, &len, NULL, 0)) {
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return -1;
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}
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// The bump on each statclock is
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// ((cur_systimer - prev_systimer) * systimer_freq) >> 32
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// where
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// systimer_freq = sysctl kern.cputimer.freq
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len = sizeof(*freq);
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if (sysctlbyname("kern.cputimer.freq", freq, &len, NULL, 0)) {
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return -1;
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}
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// Get the cpu times.
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struct kinfo_cputime cp_t[ncpu];
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bzero(cp_t, sizeof(struct kinfo_cputime)*ncpu);
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len = sizeof(cp_t[0])*ncpu;
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if (sysctlbyname("kern.cputime", &cp_t, &len, NULL, 0)) {
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return -1;
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}
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// string needs to hold (5*ncpu)(uint64_t + char)
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// The char is the space between values.
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int cputime_size = (sizeof(uint64_t)+sizeof(char))*(5*ncpu);
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*cputime = (char *) malloc(cputime_size);
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bzero(*cputime, cputime_size);
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uint64_t user, nice, sys, intr, idle;
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user = nice = sys = intr = idle = 0;
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for (int i = 0; i < ncpu; ++i) {
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user = cp_t[i].cp_user;
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nice = cp_t[i].cp_nice;
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sys = cp_t[i].cp_sys;
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intr = cp_t[i].cp_intr;
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idle = cp_t[i].cp_idle;
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sprintf(*cputime + strlen(*cputime), "%llu %llu %llu %llu %llu ", user, nice, sys, intr, idle );
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}
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return 0;
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}
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*/
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import "C"
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const maxCPUTimesLen = C.MAXCPU * C.CPUSTATES
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type statCollector struct {
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cpu *prometheus.Desc
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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.NewDesc(
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prometheus.BuildFQName(Namespace, "", "cpu"),
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"Seconds the cpus spent in each mode.",
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[]string{"cpu", "mode"}, nil,
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),
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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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// States: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
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//
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// Each value is a counter incremented at frequency
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// kern.cputimer.freq
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//
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// Look into sys/kern/kern_clock.c for details.
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var cpuTimesC *C.char
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var cpuTimerFreq C.long
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var fieldsCount = 5
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if C.getCPUTimes(&cpuTimesC, &cpuTimerFreq) == -1 {
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return errors.New("could not retrieve CPU times")
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}
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cpuTimes := strings.Split(strings.TrimSpace(C.GoString(cpuTimesC)), " ")
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C.free(unsafe.Pointer(cpuTimesC))
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// Export order: user nice sys intr idle
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cpuFields := []string{"user", "nice", "sys", "interrupt", "idle"}
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for i, v := range cpuTimes {
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cpux := fmt.Sprintf("cpu%d", i/fieldsCount)
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value, err := strconv.ParseFloat(v, 64)
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if err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, value/float64(cpuTimerFreq), cpux, cpuFields[i%fieldsCount])
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}
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return nil
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}
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