88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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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"fmt"
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"io"
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"strconv"
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"github.com/google/cadvisor/utils/fs"
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)
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type ProcessSchedStat struct {
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// Number of processes
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NumProcesses int
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// Total time spent on the cpu (Unit: nanoseconds)
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Running uint64
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// Total time spent waiting on a runqueue (Unit: nanoseconds)
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RunWait uint64
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// # of timeslices run on this cpu. i.e. # of times run on the cpu
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NumTimeSlices uint64
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}
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func readUint64List(r io.Reader) ([]uint64, error) {
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ret := make([]uint64, 0, 4)
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scanner := bufio.NewScanner(r)
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scanner.Split(bufio.ScanWords)
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for scanner.Scan() {
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str := scanner.Text()
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u, err := strconv.ParseUint(str, 10, 64)
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if err != nil {
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return nil, err
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}
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ret = append(ret, u)
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return ret, nil
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}
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// Add() read the schedstat of pid, and add stat to the fields
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// in self parameters. This function is useful if one wants to read stats of
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// a group of processes.
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func (self *ProcessSchedStat) Add(pid int) error {
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if self == nil {
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return fmt.Errorf("nil stat")
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}
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path := fmt.Sprintf("/proc/%d/schedstat", pid)
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f, err := fs.Open(path)
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if err != nil {
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return err
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}
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defer f.Close()
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v, err := readUint64List(f)
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if err != nil {
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return err
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}
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if len(v) < 3 {
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return fmt.Errorf("only %v fields read from %v: %v", len(v), path, v)
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}
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self.Running += v[0]
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self.RunWait += v[1]
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self.NumTimeSlices += v[2]
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self.NumProcesses++
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return nil
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}
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