324 lines
7.1 KiB
Go
324 lines
7.1 KiB
Go
package cgroups
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import (
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"bufio"
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"fmt"
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"io/ioutil"
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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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"syscall"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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func NewBlkio(root string) *blkioController {
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return &blkioController{
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root: filepath.Join(root, string(Blkio)),
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}
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}
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type blkioController struct {
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root string
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}
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func (b *blkioController) Name() Name {
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return Blkio
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}
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func (b *blkioController) Path(path string) string {
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return filepath.Join(b.root, path)
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}
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func (b *blkioController) Create(path string, resources *specs.LinuxResources) error {
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if err := os.MkdirAll(b.Path(path), defaultDirPerm); err != nil {
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return err
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}
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if resources.BlockIO == nil {
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return nil
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}
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for _, t := range createBlkioSettings(resources.BlockIO) {
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if t.value != nil {
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if err := ioutil.WriteFile(
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filepath.Join(b.Path(path), fmt.Sprintf("blkio.%s", t.name)),
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t.format(t.value),
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defaultFilePerm,
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); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (b *blkioController) Update(path string, resources *specs.LinuxResources) error {
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return b.Create(path, resources)
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}
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func (b *blkioController) Stat(path string, stats *Stats) error {
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stats.Blkio = &BlkioStat{}
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settings := []blkioStatSettings{
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{
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name: "throttle.io_serviced",
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entry: &stats.Blkio.IoServicedRecursive,
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},
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{
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name: "throttle.io_service_bytes",
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entry: &stats.Blkio.IoServiceBytesRecursive,
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},
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}
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// Try to read CFQ stats available on all CFQ enabled kernels first
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if _, err := os.Lstat(filepath.Join(b.Path(path), fmt.Sprintf("blkio.io_serviced_recursive"))); err == nil {
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settings = append(settings,
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blkioStatSettings{
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name: "sectors_recursive",
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entry: &stats.Blkio.SectorsRecursive,
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},
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blkioStatSettings{
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name: "io_service_bytes_recursive",
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entry: &stats.Blkio.IoServiceBytesRecursive,
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},
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blkioStatSettings{
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name: "io_serviced_recursive",
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entry: &stats.Blkio.IoServicedRecursive,
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},
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blkioStatSettings{
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name: "io_queued_recursive",
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entry: &stats.Blkio.IoQueuedRecursive,
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},
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blkioStatSettings{
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name: "io_service_time_recursive",
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entry: &stats.Blkio.IoServiceTimeRecursive,
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},
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blkioStatSettings{
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name: "io_wait_time_recursive",
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entry: &stats.Blkio.IoWaitTimeRecursive,
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},
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blkioStatSettings{
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name: "io_merged_recursive",
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entry: &stats.Blkio.IoMergedRecursive,
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},
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blkioStatSettings{
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name: "time_recursive",
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entry: &stats.Blkio.IoTimeRecursive,
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},
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)
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}
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devices, err := getDevices("/dev")
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if err != nil {
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return err
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}
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for _, t := range settings {
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if err := b.readEntry(devices, path, t.name, t.entry); err != nil {
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return err
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}
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}
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return nil
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}
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func (b *blkioController) readEntry(devices map[deviceKey]string, path, name string, entry *[]BlkioEntry) error {
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f, err := os.Open(filepath.Join(b.Path(path), fmt.Sprintf("blkio.%s", name)))
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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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sc := bufio.NewScanner(f)
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for sc.Scan() {
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if err := sc.Err(); err != nil {
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return err
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}
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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 fmt.Errorf("Invalid line found while parsing %s: %s", path, sc.Text())
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}
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}
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major, err := strconv.ParseUint(fields[0], 10, 64)
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if err != nil {
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return err
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}
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minor, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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return err
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}
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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 err
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}
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*entry = append(*entry, BlkioEntry{
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Device: devices[deviceKey{major, minor}],
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Major: major,
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Minor: minor,
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Op: op,
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Value: v,
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})
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}
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return nil
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}
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func createBlkioSettings(blkio *specs.LinuxBlockIO) []blkioSettings {
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settings := []blkioSettings{
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{
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name: "weight",
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value: blkio.Weight,
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format: uintf,
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},
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{
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name: "leaf_weight",
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value: blkio.LeafWeight,
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format: uintf,
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},
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}
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for _, wd := range blkio.WeightDevice {
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settings = append(settings,
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blkioSettings{
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name: "weight_device",
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value: wd,
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format: weightdev,
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},
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blkioSettings{
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name: "leaf_weight_device",
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value: wd,
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format: weightleafdev,
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})
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}
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for _, t := range []struct {
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name string
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list []specs.LinuxThrottleDevice
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}{
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{
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name: "throttle.read_bps_device",
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list: blkio.ThrottleReadBpsDevice,
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},
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{
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name: "throttle.read_iops_device",
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list: blkio.ThrottleReadIOPSDevice,
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},
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{
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name: "throttle.write_bps_device",
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list: blkio.ThrottleWriteBpsDevice,
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},
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{
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name: "throttle.write_iops_device",
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list: blkio.ThrottleWriteIOPSDevice,
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},
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} {
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for _, td := range t.list {
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settings = append(settings, blkioSettings{
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name: t.name,
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value: td,
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format: throttleddev,
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})
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}
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}
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return settings
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}
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type blkioSettings struct {
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name string
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value interface{}
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format func(v interface{}) []byte
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}
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type blkioStatSettings struct {
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name string
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entry *[]BlkioEntry
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}
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func uintf(v interface{}) []byte {
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return []byte(strconv.FormatUint(uint64(*v.(*uint16)), 10))
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}
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func weightdev(v interface{}) []byte {
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wd := v.(specs.LinuxWeightDevice)
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return []byte(fmt.Sprintf("%d:%d %d", wd.Major, wd.Minor, wd.Weight))
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}
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func weightleafdev(v interface{}) []byte {
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wd := v.(specs.LinuxWeightDevice)
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return []byte(fmt.Sprintf("%d:%d %d", wd.Major, wd.Minor, wd.LeafWeight))
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}
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func throttleddev(v interface{}) []byte {
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td := v.(specs.LinuxThrottleDevice)
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return []byte(fmt.Sprintf("%d:%d %d", td.Major, td.Minor, td.Rate))
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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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type deviceKey struct {
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major, minor uint64
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}
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// getDevices makes a best effort attempt to read all the devices into a map
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// keyed by major and minor number. Since devices may be mapped multiple times,
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// we err on taking the first occurrence.
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func getDevices(path string) (map[deviceKey]string, error) {
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// TODO(stevvooe): We are ignoring lots of errors. It might be kind of
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// challenging to debug this if we aren't mapping devices correctly.
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// Consider logging these errors.
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devices := map[deviceKey]string{}
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if err := filepath.Walk(path, func(p string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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switch {
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case fi.IsDir():
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switch fi.Name() {
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case "pts", "shm", "fd", "mqueue", ".lxc", ".lxd-mounts":
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return filepath.SkipDir
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default:
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return nil
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}
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case fi.Name() == "console":
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return nil
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default:
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if fi.Mode()&os.ModeDevice == 0 {
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// skip non-devices
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return nil
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}
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st, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return fmt.Errorf("%s: unable to convert to system stat", p)
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}
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key := deviceKey{major(st.Rdev), minor(st.Rdev)}
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if _, ok := devices[key]; ok {
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return nil // skip it if we have already populated the path.
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}
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devices[key] = p
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}
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return nil
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}); err != nil {
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return nil, err
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}
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return devices, nil
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}
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func major(devNumber uint64) uint64 {
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return (devNumber >> 8) & 0xfff
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}
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func minor(devNumber uint64) uint64 {
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return (devNumber & 0xff) | ((devNumber >> 12) & 0xfff00)
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}
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