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// Copyright 2016 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.
//go:build !nocpu
// +build !nocpu
package collector
import (
"errors"
"log/slog"
"strconv"
"unsafe"
"github.com/prometheus/client_golang/prometheus"
)
/*
#cgo LDFLAGS:
#include <sys/sysctl.h>
#include <kinfo.h>
#include <stdlib.h>
#include <stdio.h>
int
getCPUTimes(uint64_t **cputime, size_t *cpu_times_len) {
size_t len;
// Get number of cpu cores.
int mib[2];
int ncpu;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
len = sizeof(ncpu);
if (sysctl(mib, 2, &ncpu, &len, NULL, 0)) {
return -1;
}
// Get the cpu times.
struct kinfo_cputime cp_t[ncpu];
bzero(cp_t, sizeof(struct kinfo_cputime)*ncpu);
len = sizeof(cp_t[0])*ncpu;
if (sysctlbyname("kern.cputime", &cp_t, &len, NULL, 0)) {
return -1;
}
*cpu_times_len = ncpu*CPUSTATES;
uint64_t user, nice, sys, intr, idle;
user = nice = sys = intr = idle = 0;
*cputime = (uint64_t *) malloc(sizeof(uint64_t)*(*cpu_times_len));
for (int i = 0; i < ncpu; ++i) {
int offset = CPUSTATES * i;
(*cputime)[offset] = cp_t[i].cp_user;
(*cputime)[offset+1] = cp_t[i].cp_nice;
(*cputime)[offset+2] = cp_t[i].cp_sys;
(*cputime)[offset+3] = cp_t[i].cp_intr;
(*cputime)[offset+4] = cp_t[i].cp_idle;
}
return 0;
}
*/
import "C"
const maxCPUTimesLen = C.MAXCPU * C.CPUSTATES
type statCollector struct {
cpu *prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector("cpu", defaultEnabled, NewStatCollector)
}
// NewStatCollector returns a new Collector exposing CPU stats.
func NewStatCollector(logger *slog.Logger) (Collector, error) {
return &statCollector{
cpu: nodeCPUSecondsDesc,
logger: logger,
}, nil
}
func getDragonFlyCPUTimes() ([]float64, error) {
// We want time spent per-CPU per CPUSTATE.
// CPUSTATES (number of CPUSTATES) is defined as 5U.
// States: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
//
// Each value is in microseconds
//
// Look into sys/kern/kern_clock.c for details.
var (
cpuTimesC *C.uint64_t
cpuTimesLength C.size_t
)
if C.getCPUTimes(&cpuTimesC, &cpuTimesLength) == -1 {
return nil, errors.New("could not retrieve CPU times")
}
defer C.free(unsafe.Pointer(cpuTimesC))
cput := (*[maxCPUTimesLen]C.uint64_t)(unsafe.Pointer(cpuTimesC))[:cpuTimesLength:cpuTimesLength]
cpuTimes := make([]float64, cpuTimesLength)
for i, value := range cput {
cpuTimes[i] = float64(value) / float64(1000000)
}
return cpuTimes, nil
}
// Expose CPU stats using sysctl.
func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
var fieldsCount = 5
cpuTimes, err := getDragonFlyCPUTimes()
if err != nil {
return err
}
// Export order: user nice sys intr idle
cpuFields := []string{"user", "nice", "sys", "interrupt", "idle"}
for i, value := range cpuTimes {
cpux := strconv.Itoa(i / fieldsCount)
ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, value, cpux, cpuFields[i%fieldsCount])
}
return nil
}
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