mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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7f4fb34182
It is better developing vmctl tool in VictoriaMetrics repository, so it could be released together with the rest of vmutils tools such as vmalert, vmagent, vmbackup, vmrestore and vmauth.
118 lines
2.9 KiB
Go
118 lines
2.9 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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package procfs
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import (
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"bufio"
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"errors"
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"os"
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"regexp"
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"strconv"
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)
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var (
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cpuLineRE = regexp.MustCompile(`cpu(\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+)`)
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procLineRE = regexp.MustCompile(`(\d+) (\d+) (\d+)`)
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)
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// Schedstat contains scheduler statistics from /proc/schedstat
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//
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// See
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// https://www.kernel.org/doc/Documentation/scheduler/sched-stats.txt
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// for a detailed description of what these numbers mean.
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//
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// Note the current kernel documentation claims some of the time units are in
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// jiffies when they are actually in nanoseconds since 2.6.23 with the
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// introduction of CFS. A fix to the documentation is pending. See
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// https://lore.kernel.org/patchwork/project/lkml/list/?series=403473
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type Schedstat struct {
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CPUs []*SchedstatCPU
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}
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// SchedstatCPU contains the values from one "cpu<N>" line
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type SchedstatCPU struct {
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CPUNum string
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RunningNanoseconds uint64
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WaitingNanoseconds uint64
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RunTimeslices uint64
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}
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// ProcSchedstat contains the values from /proc/<pid>/schedstat
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type ProcSchedstat struct {
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RunningNanoseconds uint64
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WaitingNanoseconds uint64
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RunTimeslices uint64
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}
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// Schedstat reads data from /proc/schedstat
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func (fs FS) Schedstat() (*Schedstat, error) {
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file, err := os.Open(fs.proc.Path("schedstat"))
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if err != nil {
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return nil, err
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}
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defer file.Close()
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stats := &Schedstat{}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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match := cpuLineRE.FindStringSubmatch(scanner.Text())
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if match != nil {
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cpu := &SchedstatCPU{}
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cpu.CPUNum = match[1]
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cpu.RunningNanoseconds, err = strconv.ParseUint(match[8], 10, 64)
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if err != nil {
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continue
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}
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cpu.WaitingNanoseconds, err = strconv.ParseUint(match[9], 10, 64)
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if err != nil {
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continue
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}
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cpu.RunTimeslices, err = strconv.ParseUint(match[10], 10, 64)
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if err != nil {
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continue
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}
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stats.CPUs = append(stats.CPUs, cpu)
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}
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}
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return stats, nil
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}
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func parseProcSchedstat(contents string) (stats ProcSchedstat, err error) {
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match := procLineRE.FindStringSubmatch(contents)
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if match != nil {
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stats.RunningNanoseconds, err = strconv.ParseUint(match[1], 10, 64)
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if err != nil {
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return
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}
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stats.WaitingNanoseconds, err = strconv.ParseUint(match[2], 10, 64)
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if err != nil {
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return
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}
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stats.RunTimeslices, err = strconv.ParseUint(match[3], 10, 64)
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return
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}
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err = errors.New("could not parse schedstat")
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return
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}
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