func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
info := make(map[string]float64)
size, err := unix.SysctlUint32("vm.stats.vm.v_page_size")
if err != nil {
return nil, fmt.Errorf("sysctl(vm.stats.vm.v_page_size) failed: %s", err)
}
for key, v := range map[string]string{
"active": "vm.stats.vm.v_active_count",
"inactive": "vm.stats.vm.v_inactive_count",
"wire": "vm.stats.vm.v_wire_count",
"cache": "vm.stats.vm.v_cache_count",
"free": "vm.stats.vm.v_free_count",
"swappgsin": "vm.stats.vm.v_swappgsin",
"swappgsout": "vm.stats.vm.v_swappgsout",
"total": "vm.stats.vm.v_page_count",
} {
value, err := unix.SysctlUint32(v)
if err != nil {
return nil, err
}
// Convert metrics to kB (same as Linux meminfo).
info[key] = float64(value) * float64(size)
}
return info, nil
}
// Expose CPU stats using sysctl.
func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
// We want time spent per-cpu per CPUSTATE.
// CPUSTATES (number of CPUSTATES) is defined as 5U.
// Order: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
// sysctl kern.cp_times provides hw.ncpu * CPUSTATES long integers:
// hw.ncpu * (space-separated list of the above variables)
//
// Each value is a counter incremented at frequency
// kern.clockrate.(stathz | hz)
//
// Look into sys/kern/kern_clock.c for details.
cpuTimes, err := getCPUTimes()
if err != nil {
return err
}
for cpu, t := range cpuTimes {
lcpu := strconv.Itoa(cpu)
ch <- c.cpu.mustNewConstMetric(float64(t.user), lcpu, "user")
ch <- c.cpu.mustNewConstMetric(float64(t.nice), lcpu, "nice")
ch <- c.cpu.mustNewConstMetric(float64(t.sys), lcpu, "system")
ch <- c.cpu.mustNewConstMetric(float64(t.intr), lcpu, "interrupt")
ch <- c.cpu.mustNewConstMetric(float64(t.idle), lcpu, "idle")
temp, err := unix.SysctlUint32(fmt.Sprintf("dev.cpu.%d.temperature", cpu))
if err != nil {
if err == unix.ENOENT {
// No temperature information for this CPU
log.Debugf("no temperature information for CPU %d", cpu)
} else {
// Unexpected error
ch <- c.temp.mustNewConstMetric(math.NaN(), lcpu)
log.Errorf("failed to query CPU temperature for CPU %d: %s", cpu, err)
}
continue
}
ch <- c.temp.mustNewConstMetric(float64(temp-2732)/10, lcpu)
}
return err
}