mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 20:36:21 +01:00
110 lines
2.4 KiB
Go
110 lines
2.4 KiB
Go
// Copyright 2020 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 !nointerrupts
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package collector
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import (
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"fmt"
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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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const (
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KERN_INTRCNT = 63
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KERN_INTRCNT_NUM = 1
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KERN_INTRCNT_CNT = 2
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KERN_INTRCNT_NAME = 3
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KERN_INTRCNT_VECTOR = 4
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)
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func nintr() _C_int {
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mib := [3]_C_int{unix.CTL_KERN, KERN_INTRCNT, KERN_INTRCNT_NUM}
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buf, err := sysctl(mib[:])
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if err != nil {
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return 0
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}
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return *(*_C_int)(unsafe.Pointer(&buf[0]))
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}
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func intr(idx _C_int) (itr interrupt, err error) {
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mib := [4]_C_int{unix.CTL_KERN, KERN_INTRCNT, KERN_INTRCNT_NAME, idx}
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buf, err := sysctl(mib[:])
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if err != nil {
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return
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}
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dev := *(*[128]byte)(unsafe.Pointer(&buf[0]))
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itr.device = string(dev[:])
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mib[2] = KERN_INTRCNT_VECTOR
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buf, err = sysctl(mib[:])
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if err != nil {
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return
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}
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itr.vector = *(*int)(unsafe.Pointer(&buf[0]))
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mib[2] = KERN_INTRCNT_CNT
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buf, err = sysctl(mib[:])
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if err != nil {
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return
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}
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count := *(*uint64)(unsafe.Pointer(&buf[0]))
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itr.values = []float64{float64(count)}
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return
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}
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var interruptLabelNames = []string{"cpu", "type", "devices"}
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func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) error {
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interrupts, err := getInterrupts()
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if err != nil {
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return fmt.Errorf("couldn't get interrupts: %s", err)
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}
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for dev, interrupt := range interrupts {
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for cpuNo, value := range interrupt.values {
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ch <- c.desc.mustNewConstMetric(
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value,
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strconv.Itoa(cpuNo),
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fmt.Sprintf("%d", interrupt.vector),
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dev,
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)
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}
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}
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return nil
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}
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type interrupt struct {
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vector int
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device string
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values []float64
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}
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func getInterrupts() (map[string]interrupt, error) {
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var interrupts = map[string]interrupt{}
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n := nintr()
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for i := _C_int(0); i < n; i++ {
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itr, err := intr(i)
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if err != nil {
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return nil, err
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}
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interrupts[itr.device] = itr
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}
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return interrupts, nil
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}
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