mirror of
https://github.com/prometheus/node_exporter.git
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3fb5f70b0c
Drop redundant GOOS build tags at start of file if the constraint is already specified by the filename, e.g. foo_GOOS.go or foo_GOOS_GOARCH.go, avoiding potential confusion in future. cf. https://pkg.go.dev/cmd/go#hdr-Build_constraints Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
// Copyright 2019 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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//go:build !nocpu
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// +build !nocpu
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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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"github.com/go-kit/log"
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"github.com/illumos/go-kstat"
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"github.com/prometheus/client_golang/prometheus"
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)
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// #include <unistd.h>
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import "C"
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type cpuFreqCollector struct {
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logger log.Logger
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}
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func init() {
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registerCollector("cpufreq", defaultEnabled, NewCpuFreqCollector)
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}
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func NewCpuFreqCollector(logger log.Logger) (Collector, error) {
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return &cpuFreqCollector{
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logger: logger,
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}, nil
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}
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func (c *cpuFreqCollector) Update(ch chan<- prometheus.Metric) error {
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ncpus := C.sysconf(C._SC_NPROCESSORS_ONLN)
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tok, err := kstat.Open()
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if err != nil {
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return err
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}
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defer tok.Close()
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for cpu := 0; cpu < int(ncpus); cpu++ {
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ksCPUInfo, err := tok.Lookup("cpu_info", cpu, fmt.Sprintf("cpu_info%d", cpu))
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if err != nil {
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return err
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}
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cpuFreqV, err := ksCPUInfo.GetNamed("current_clock_Hz")
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if err != nil {
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return err
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}
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cpuFreqMaxV, err := ksCPUInfo.GetNamed("clock_MHz")
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if err != nil {
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return err
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}
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lcpu := strconv.Itoa(cpu)
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ch <- prometheus.MustNewConstMetric(
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cpuFreqHertzDesc,
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prometheus.GaugeValue,
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float64(cpuFreqV.UintVal),
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lcpu,
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)
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// Multiply by 1e+6 to convert MHz to Hz.
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ch <- prometheus.MustNewConstMetric(
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cpuFreqMaxDesc,
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prometheus.GaugeValue,
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float64(cpuFreqMaxV.IntVal)*1e+6,
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lcpu,
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)
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}
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return nil
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}
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