1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// 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.
//go:build !nocpu
// +build !nocpu
package collector
import (
"fmt"
"log/slog"
"math"
"strconv"
"unsafe"
"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 *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: 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
c.logger.Debug("no temperature information for CPU", "cpu", cpu)
} else {
// Unexpected error
ch <- c.temp.mustNewConstMetric(math.NaN(), lcpu)
c.logger.Error("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
}
|
