435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
119 lines
2.9 KiB
Go
119 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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