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// Copyright 2015 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.
// +build !nocpu
package collector
import (
"fmt"
"math"
"strconv"
"unsafe"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
type clockinfo struct {
hz int32 // clock frequency
tick int32 // micro-seconds per hz tick
spare int32
stathz int32 // statistics clock frequency
profhz int32 // profiling clock frequency
}
type cputime struct {
user float64
nice float64
sys float64
intr float64
idle float64
}
func getCPUTimes() ([]cputime, error) {
const states = 5
clockb, err := unix.SysctlRaw("kern.clockrate")
if err != nil {
return nil, err
}
clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
cpb, err := unix.SysctlRaw("kern.cp_times")
if err != nil {
return nil, err
}
var cpufreq float64
if clock.stathz > 0 {
cpufreq = float64(clock.stathz)
} else {
cpufreq = float64(clock.hz)
}
var times []float64
for len(cpb) >= int(unsafe.Sizeof(int(0))) {
t := *(*int)(unsafe.Pointer(&cpb[0]))
times = append(times, float64(t)/cpufreq)
cpb = cpb[unsafe.Sizeof(int(0)):]
}
cpus := make([]cputime, len(times)/states)
for i := 0; i < len(times); i += states {
cpu := &cpus[i/states]
cpu.user = times[i]
cpu.nice = times[i+1]
cpu.sys = times[i+2]
cpu.intr = times[i+3]
cpu.idle = times[i+4]
}
return cpus, nil
}
type statCollector struct {
cpu typedDesc
temp typedDesc
logger log.Logger
}
func init() {
registerCollector("cpu", defaultEnabled, NewStatCollector)
}
// NewStatCollector returns a new Collector exposing CPU stats.
func NewStatCollector(logger log.Logger) (Collector, error) {
return &statCollector{
cpu: typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
temp: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "temperature_celsius"),
"CPU temperature",
[]string{"cpu"}, nil,
), prometheus.GaugeValue},
logger: logger,
}, nil
}
// Expose CPU stats using sysctl.
func (c *statCollector) Update(ch chan<- prometheus.Metric) 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
level.Debug(c.logger).Log("msg", "no temperature information for CPU", "cpu", cpu)
} else {
// Unexpected error
ch <- c.temp.mustNewConstMetric(math.NaN(), lcpu)
level.Error(c.logger).Log("msg", "failed to query CPU temperature for CPU", "cpu", cpu, "err", err)
}
continue
}
// Temp is a signed integer in deci-degrees Kelvin.
// Cast uint32 to int32 and convert to float64 degrees Celsius.
//
// 2732 is used as the conversion constant for deci-degrees
// Kelvin, in multiple places in the kernel that feed into this
// sysctl, so we want to maintain consistency:
//
// sys/dev/amdtemp/amdtemp.c
// #define AMDTEMP_ZERO_C_TO_K 2732
//
// sys/dev/acpica/acpi_thermal.c
// #define TZ_ZEROC 2732
//
// sys/dev/coretemp/coretemp.c
// #define TZ_ZEROC 2732
ch <- c.temp.mustNewConstMetric(float64(int32(temp)-2732)/10, lcpu)
}
return err
}
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