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converted freebsd cpu metrics to seconds

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This commit is contained in:
Kirk Russell 2015-09-26 18:08:18 -04:00
parent a942e719c8
commit 89875cefe8
1 changed files with 43 additions and 5 deletions
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48
collector/cpu_freebsd.go
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@ -28,9 +28,26 @@ import (
#cgo LDFLAGS: -lkvm
#include <fcntl.h>
#include <kvm.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/pcpu.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/time.h>
long _clockrate() {
struct clockinfo clockrate;
size_t size = sizeof(clockrate);
int res = sysctlbyname("kern.clockrate", &clockrate, &size, NULL, 0);
if (res == -1) {
return -1;
}
if (size != sizeof(clockrate)) {
return -2;
}
return clockrate.stathz > 0 ? clockrate.stathz : clockrate.hz;
}
*/
import "C"
@ -70,16 +87,37 @@ func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
}
defer C.kvm_close(kd)
// The cp_time variable is an array of CPUSTATES long integers -- in
// the same format as the kern.cp_time sysctl. According to the
// comments in sys/kern/kern_clock.c, the frequency of this timer will
// be stathz (or hz, if stathz is zero).
clockrate, err := getClockRate()
if err != nil {
return err
}
ncpus := C.kvm_getncpus(kd)
for i := 0; i < int(ncpus); i++ {
pcpu := C.kvm_getpcpu(kd, C.int(i))
cp_time := ((*C.struct_pcpu)(unsafe.Pointer(pcpu))).pc_cp_time
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "user"}).Set(float64(cp_time[C.CP_USER]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "nice"}).Set(float64(cp_time[C.CP_NICE]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "system"}).Set(float64(cp_time[C.CP_SYS]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "interrupt"}).Set(float64(cp_time[C.CP_INTR]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "idle"}).Set(float64(cp_time[C.CP_IDLE]))
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "user"}).Set(float64(cp_time[C.CP_USER])/clockrate)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "nice"}).Set(float64(cp_time[C.CP_NICE])/clockrate)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "system"}).Set(float64(cp_time[C.CP_SYS])/clockrate)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "interrupt"}).Set(float64(cp_time[C.CP_INTR])/clockrate)
c.cpu.With(prometheus.Labels{"cpu": strconv.Itoa(i), "mode": "idle"}).Set(float64(cp_time[C.CP_IDLE])/clockrate)
}
c.cpu.Collect(ch)
return err
}
func getClockRate() (float64, error) {
clockrate := C._clockrate()
if clockrate == -1 {
return 0, errors.New("sysctl(kern.clockrate) failed")
} else if clockrate == -2 {
return 0, errors.New("sysctl(kern.clockrate) failed, wrong buffer size")
} else if clockrate <= 0 {
return 0, errors.New("sysctl(kern.clockrate) bad clocktime")
}
return float64(clockrate), nil
}