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moby--moby/pkg/cgroups/fs/blkio.go
Michael Crosby 37248039e1 Fix parsing of blkio files
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
2014-04-20 18:18:17 -07:00

121 lines
2.2 KiB
Go

package fs
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/dotcloud/docker/pkg/cgroups"
)
type blkioGroup struct {
}
func (s *blkioGroup) Set(d *data) error {
// we just want to join this group even though we don't set anything
if _, err := d.join("blkio"); err != nil && err != cgroups.ErrNotFound {
return err
}
return nil
}
func (s *blkioGroup) Remove(d *data) error {
return removePath(d.path("blkio"))
}
/*
examples:
blkio.sectors
8:0 6792
blkio.io_service_bytes
8:0 Read 1282048
8:0 Write 2195456
8:0 Sync 2195456
8:0 Async 1282048
8:0 Total 3477504
Total 3477504
blkio.io_serviced
8:0 Read 124
8:0 Write 104
8:0 Sync 104
8:0 Async 124
8:0 Total 228
Total 228
blkio.io_queued
8:0 Read 0
8:0 Write 0
8:0 Sync 0
8:0 Async 0
8:0 Total 0
Total 0
*/
func (s *blkioGroup) Stats(d *data) (map[string]float64, error) {
var (
paramData = make(map[string]float64)
params = []string{
"io_service_bytes_recursive",
"io_serviced_recursive",
"io_queued_recursive",
}
)
path, err := d.path("blkio")
if err != nil {
return nil, err
}
k, v, err := s.getSectors(path)
if err != nil {
return nil, err
}
paramData[fmt.Sprintf("blkio.sectors_recursive:%s", k)] = v
for _, param := range params {
f, err := os.Open(filepath.Join(path, fmt.Sprintf("blkio.%s", param)))
if err != nil {
return nil, err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
// format: dev type amount
fields := strings.Fields(sc.Text())
switch len(fields) {
case 3:
v, err := strconv.ParseFloat(fields[2], 64)
if err != nil {
return nil, err
}
paramData[fmt.Sprintf("%s:%s:%s", param, fields[0], fields[1])] = v
case 2:
// this is the total line, skip
default:
return nil, ErrNotValidFormat
}
}
}
return paramData, nil
}
func (s *blkioGroup) getSectors(path string) (string, float64, error) {
f, err := os.Open(filepath.Join(path, "blkio.sectors_recursive"))
if err != nil {
return "", 0, err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return "", 0, err
}
return getCgroupParamKeyValue(string(data))
}