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// Copyright 2020 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 !nointerrupts
// +build !nointerrupts
package collector
import (
"fmt"
"strconv"
"unsafe"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
const (
KERN_INTRCNT = 63
KERN_INTRCNT_NUM = 1
KERN_INTRCNT_CNT = 2
KERN_INTRCNT_NAME = 3
KERN_INTRCNT_VECTOR = 4
)
func nintr() _C_int {
mib := [3]_C_int{unix.CTL_KERN, KERN_INTRCNT, KERN_INTRCNT_NUM}
buf, err := sysctl(mib[:])
if err != nil {
return 0
}
return *(*_C_int)(unsafe.Pointer(&buf[0]))
}
func intr(idx _C_int) (itr interrupt, err error) {
mib := [4]_C_int{unix.CTL_KERN, KERN_INTRCNT, KERN_INTRCNT_NAME, idx}
buf, err := sysctl(mib[:])
if err != nil {
return
}
dev := *(*[128]byte)(unsafe.Pointer(&buf[0]))
itr.device = string(dev[:])
mib[2] = KERN_INTRCNT_VECTOR
buf, err = sysctl(mib[:])
if err != nil {
return
}
itr.vector = *(*int)(unsafe.Pointer(&buf[0]))
mib[2] = KERN_INTRCNT_CNT
buf, err = sysctl(mib[:])
if err != nil {
return
}
count := *(*uint64)(unsafe.Pointer(&buf[0]))
itr.values = []float64{float64(count)}
return
}
var interruptLabelNames = []string{"cpu", "type", "devices"}
func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) error {
interrupts, err := getInterrupts()
if err != nil {
return fmt.Errorf("couldn't get interrupts: %s", err)
}
for dev, interrupt := range interrupts {
for cpuNo, value := range interrupt.values {
interruptType := fmt.Sprintf("%d", interrupt.vector)
filterName := interruptType + ";" + dev
if c.nameFilter.ignored(filterName) {
c.logger.Debug("ignoring interrupt name", "filter_name", filterName)
continue
}
if !c.includeZeros && value == 0.0 {
c.logger.Debug("ignoring interrupt with zero value", "filter_name", filterName, "cpu", cpuNo)
continue
}
ch <- c.desc.mustNewConstMetric(
value,
strconv.Itoa(cpuNo),
interruptType,
dev,
)
}
}
return nil
}
type interrupt struct {
vector int
device string
values []float64
}
func getInterrupts() (map[string]interrupt, error) {
var interrupts = map[string]interrupt{}
n := nintr()
for i := _C_int(0); i < n; i++ {
itr, err := intr(i)
if err != nil {
return nil, err
}
interrupts[itr.device] = itr
}
return interrupts, nil
}
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