129 lines
3.6 KiB
Go
129 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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"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:
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#include <stdio.h>
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#include <kinfo.h>
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#include <sys/sysctl.h>
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int
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getCPUTimes(int *ncpu, double **cpu_times, size_t *cp_times_length)
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{
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int cpu, mib[2];
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struct kinfo_cputime cp_t[ncpu];
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uint64_t user, nice, sys, intr, idle;
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size_t len;
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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 (-1 == sysctl(mib, 2, &ncpu, &len, NULL, 0))
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return -1;
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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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// Retrieve clockrate
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struct clockinfo clockrate;
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int mib_kern_clockrate[] = {CTL_KERN, KERN_CLOCKRATE};
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size_t mib_kern_clockrate_len = 2;
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size_t clockrate_size = sizeof(clockrate);
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if (sysctl(mib_kern_clockrate, mib_kern_clockrate_len, &clockrate, &clockrate_size, NULL, 0) == -1)
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return -1;
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long cpufreq = clockrate.stathz > 0 ? clockrate.stathz : clockrate.hz;
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cpu_times = (double *) malloc(sizeof(double)*(*cp_times_length));
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for (int i = 0; i < (*cp_times_length); i++) {
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(*cpu_times)[i] = ((double) cp_times[i]) / cpufreq;
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}
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return 0;
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}
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void freeCPUTimes(double *cpu_times) {
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free(cpu_times);
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}
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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 sysctl.
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func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
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// Adapted from
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// https://www.dragonflybsd.org/mailarchive/users/2010-04/msg00056.html
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var ncpu C.int
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var cpuTimesC *C.double
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var cpuTimesLength C.size_t
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if C.getCPUTimes(&ncpu, &cpuTimesC, &cpuTimesLength) == -1 {
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return errors.New("could not retrieve CPU times")
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}
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defer C.freeCPUTimes(cpuTimesC)
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// Convert C.double array to Go array (https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices).
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cpuTimes := (*[maxCPUTimesLen]C.double)(unsafe.Pointer(cpuTimesC))[:cpuTimesLength:cpuTimesLength]
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for cpu := 0; cpu < int(ncpu); cpu++ {
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base_idx := C.CPUSTATES * cpu
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "user"}).Set(float64(cpuTimes[base_idx+C.CP_USER]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "nice"}).Set(float64(cpuTimes[base_idx+C.CP_NICE]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "system"}).Set(float64(cpuTimes[base_idx+C.CP_SYS]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "interrupt"}).Set(float64(cpuTimes[base_idx+C.CP_INTR]))
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c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(cpu), "mode": "idle"}).Set(float64(cpuTimes[base_idx+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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