143 lines
2.9 KiB
Go
143 lines
2.9 KiB
Go
package fs
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import (
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"bufio"
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/dotcloud/docker/pkg/libcontainer/cgroups"
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)
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type blkioGroup struct {
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}
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func (s *blkioGroup) Set(d *data) error {
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// we just want to join this group even though we don't set anything
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if _, err := d.join("blkio"); err != nil && err != cgroups.ErrNotFound {
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return err
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}
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return nil
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}
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func (s *blkioGroup) Remove(d *data) error {
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return removePath(d.path("blkio"))
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}
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/*
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examples:
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blkio.sectors
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8:0 6792
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blkio.io_service_bytes
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8:0 Read 1282048
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8:0 Write 2195456
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8:0 Sync 2195456
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8:0 Async 1282048
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8:0 Total 3477504
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Total 3477504
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blkio.io_serviced
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8:0 Read 124
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8:0 Write 104
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8:0 Sync 104
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8:0 Async 124
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8:0 Total 228
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Total 228
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blkio.io_queued
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8:0 Read 0
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8:0 Write 0
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8:0 Sync 0
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8:0 Async 0
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8:0 Total 0
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Total 0
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*/
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func splitBlkioStatLine(r rune) bool {
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return r == ' ' || r == ':'
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}
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func getBlkioStat(path string) ([]cgroups.BlkioStatEntry, error) {
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var blkioStats []cgroups.BlkioStatEntry
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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sc := bufio.NewScanner(f)
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for sc.Scan() {
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// format: dev type amount
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fields := strings.FieldsFunc(sc.Text(), splitBlkioStatLine)
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if len(fields) < 3 {
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if len(fields) == 2 && fields[0] == "Total" {
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// skip total line
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continue
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} else {
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return nil, fmt.Errorf("Invalid line found while parsing %s: %s", path, sc.Text())
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}
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}
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v, err := strconv.ParseUint(fields[0], 10, 64)
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if err != nil {
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return nil, err
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}
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major := v
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v, err = strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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return nil, err
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}
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minor := v
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op := ""
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valueField := 2
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if len(fields) == 4 {
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op = fields[2]
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valueField = 3
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}
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v, err = strconv.ParseUint(fields[valueField], 10, 64)
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if err != nil {
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return nil, err
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}
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blkioStats = append(blkioStats, cgroups.BlkioStatEntry{Major: major, Minor: minor, Op: op, Value: v})
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}
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return blkioStats, nil
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}
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func (s *blkioGroup) GetStats(d *data, stats *cgroups.Stats) error {
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var blkioStats []cgroups.BlkioStatEntry
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var err error
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path, err := d.path("blkio")
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if err != nil {
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return err
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}
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if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.sectors_recursive")); err != nil {
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return err
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}
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stats.BlkioStats.SectorsRecursive = blkioStats
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if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_service_bytes_recursive")); err != nil {
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return err
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}
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stats.BlkioStats.IoServiceBytesRecursive = blkioStats
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if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_serviced_recursive")); err != nil {
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return err
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}
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stats.BlkioStats.IoServicedRecursive = blkioStats
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if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_queued_recursive")); err != nil {
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return err
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}
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stats.BlkioStats.IoQueuedRecursive = blkioStats
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return nil
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}
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