141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
// 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
|
|
}
|