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126 lines
3.4 KiB
126 lines
3.4 KiB
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nocpu
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package collector
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import (
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"strconv"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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type clockinfo struct {
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hz int32 // clock frequency
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tick int32 // micro-seconds per hz tick
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spare int32
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stathz int32 // statistics clock frequency
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profhz int32 // profiling clock frequency
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}
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type cputime struct {
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user float64
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nice float64
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sys float64
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intr float64
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idle float64
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}
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func getCPUTimes() ([]cputime, error) {
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const states = 5
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clockb, err := unix.SysctlRaw("kern.clockrate")
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if err != nil {
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return nil, err
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}
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clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
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cpb, err := unix.SysctlRaw("kern.cp_times")
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if err != nil {
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return nil, err
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}
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var cpufreq float64
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if clock.stathz > 0 {
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cpufreq = float64(clock.stathz)
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} else {
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cpufreq = float64(clock.hz)
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}
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var times []float64
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for len(cpb) >= int(unsafe.Sizeof(int(0))) {
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t := *(*int)(unsafe.Pointer(&cpb[0]))
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times = append(times, float64(t)/cpufreq)
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cpb = cpb[unsafe.Sizeof(int(0)):]
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}
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cpus := make([]cputime, len(times)/states)
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for i := 0; i < len(times); i += states {
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cpu := &cpus[i/states]
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cpu.user = times[i]
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cpu.nice = times[i+1]
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cpu.sys = times[i+2]
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cpu.intr = times[i+3]
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cpu.idle = times[i+4]
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}
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return cpus, nil
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}
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type statCollector struct {
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cpu *prometheus.CounterVec
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}
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func init() {
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Factories["cpu"] = NewStatCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// CPU stats.
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func NewStatCollector() (Collector, error) {
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return &statCollector{
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cpu: typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "cpu", "seconds_total"),
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"Seconds the CPU spent in each mode.",
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[]string{"cpu", "mode"}, nil,
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), prometheus.CounterValue},
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}, nil
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}
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// Expose CPU stats using sysctl.
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func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
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// We want time spent per-cpu per CPUSTATE.
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// CPUSTATES (number of CPUSTATES) is defined as 5U.
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// Order: CP_USER | CP_NICE | CP_SYS | CP_IDLE | CP_INTR
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// sysctl kern.cp_times provides hw.ncpu * CPUSTATES long integers:
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// hw.ncpu * (space-separated list of the above variables)
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//
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// Each value is a counter incremented at frequency
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// kern.clockrate.(stathz | hz)
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//
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// Look into sys/kern/kern_clock.c for details.
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cpuTimes, err := getCPUTimes()
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if err != nil {
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return err
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}
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for cpu, t := range cpuTimes {
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ch <- c.cpu.mustNewConstMetric(float64(cpuTimes[base_idx+C.CP_USER]), strconv.Itoa(cpu), "user")
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ch <- c.cpu.mustNewConstMetric(float64(cpuTimes[base_idx+C.CP_NICE]), strconv.Itoa(cpu), "nice")
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ch <- c.cpu.mustNewConstMetric(float64(cpuTimes[base_idx+C.CP_SYS]), strconv.Itoa(cpu), "system")
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ch <- c.cpu.mustNewConstMetric(float64(cpuTimes[base_idx+C.CP_INTR]), strconv.Itoa(cpu), "interrupt")
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ch <- c.cpu.mustNewConstMetric(float64(cpuTimes[base_idx+C.CP_IDLE]), strconv.Itoa(cpu), "idle")
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}
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return err
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}
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