mirror of
https://github.com/prometheus/node_exporter.git
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fe5a117831
PIDs can vanish (exit) from /proc/ between gathering the list of PIDs and getting all of their stats. * Ignore file not found errors. * Explicitly count the PIDs we find. * Cleanup some error style issues. Signed-off-by: Ben Kochie <superq@gmail.com>
120 lines
3.6 KiB
Go
120 lines
3.6 KiB
Go
// Copyright 2018 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 !noprocesses
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package collector
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import (
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"fmt"
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"os"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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"github.com/prometheus/procfs"
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)
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type processCollector struct {
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threadAlloc *prometheus.Desc
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threadLimit *prometheus.Desc
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procsState *prometheus.Desc
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pidUsed *prometheus.Desc
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pidMax *prometheus.Desc
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}
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func init() {
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registerCollector("processes", defaultDisabled, NewProcessStatCollector)
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}
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func NewProcessStatCollector() (Collector, error) {
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subsystem := "processes"
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return &processCollector{
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threadAlloc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "threads"),
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"Allocated threads in system",
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nil, nil,
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),
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threadLimit: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "max_threads"),
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"Limit of threads in the system",
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nil, nil,
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),
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procsState: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "state"),
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"Number of processes in each state.",
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[]string{"state"}, nil,
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),
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pidUsed: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "pids"),
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"Number of PIDs", nil, nil,
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),
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pidMax: prometheus.NewDesc(prometheus.BuildFQName(namespace, subsystem, "max_processes"),
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"Number of max PIDs limit", nil, nil,
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),
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}, nil
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}
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func (t *processCollector) Update(ch chan<- prometheus.Metric) error {
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pids, states, threads, err := getAllocatedThreads()
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if err != nil {
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return fmt.Errorf("unable to retrieve number of allocated threads: %q", err)
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}
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ch <- prometheus.MustNewConstMetric(t.threadAlloc, prometheus.GaugeValue, float64(threads))
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maxThreads, err := readUintFromFile(procFilePath("sys/kernel/threads-max"))
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if err != nil {
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return fmt.Errorf("unable to retrieve limit number of threads: %q", err)
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}
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ch <- prometheus.MustNewConstMetric(t.threadLimit, prometheus.GaugeValue, float64(maxThreads))
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for state := range states {
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ch <- prometheus.MustNewConstMetric(t.procsState, prometheus.GaugeValue, float64(states[state]), state)
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}
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pidM, err := readUintFromFile(procFilePath("sys/kernel/pid_max"))
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if err != nil {
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return fmt.Errorf("unable to retrieve limit number of maximum pids alloved: %q", err)
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}
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ch <- prometheus.MustNewConstMetric(t.pidUsed, prometheus.GaugeValue, float64(pids))
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ch <- prometheus.MustNewConstMetric(t.pidMax, prometheus.GaugeValue, float64(pidM))
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return nil
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}
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func getAllocatedThreads() (int, map[string]int32, int, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return 0, nil, 0, err
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}
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p, err := fs.AllProcs()
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if err != nil {
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return 0, nil, 0, err
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}
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pids := 0
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thread := 0
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procStates := make(map[string]int32)
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for _, pid := range p {
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stat, err := pid.NewStat()
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// PIDs can vanish between getting the list and getting stats.
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if os.IsNotExist(err) {
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log.Debugf("file not found when retrieving stats: %q", err)
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continue
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}
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if err != nil {
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return 0, nil, 0, err
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}
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pids += 1
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procStates[stat.State] += 1
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thread += stat.NumThreads
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}
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return pids, procStates, thread, nil
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}
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