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|
// +build linux
package fs
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/configs"
)
type BlkioGroup struct {
}
func (s *BlkioGroup) Name() string {
return "blkio"
}
func (s *BlkioGroup) Apply(d *cgroupData) error {
_, err := d.join("blkio")
if err != nil && !cgroups.IsNotFound(err) {
return err
}
return nil
}
func (s *BlkioGroup) Set(path string, cgroup *configs.Cgroup) error {
if cgroup.Resources.BlkioWeight != 0 {
if err := writeFile(path, "blkio.weight", strconv.FormatUint(uint64(cgroup.Resources.BlkioWeight), 10)); err != nil {
return err
}
}
if cgroup.Resources.BlkioLeafWeight != 0 {
if err := writeFile(path, "blkio.leaf_weight", strconv.FormatUint(uint64(cgroup.Resources.BlkioLeafWeight), 10)); err != nil {
return err
}
}
for _, wd := range cgroup.Resources.BlkioWeightDevice {
if err := writeFile(path, "blkio.weight_device", wd.WeightString()); err != nil {
return err
}
if err := writeFile(path, "blkio.leaf_weight_device", wd.LeafWeightString()); err != nil {
return err
}
}
for _, td := range cgroup.Resources.BlkioThrottleReadBpsDevice {
if err := writeFile(path, "blkio.throttle.read_bps_device", td.String()); err != nil {
return err
}
}
for _, td := range cgroup.Resources.BlkioThrottleWriteBpsDevice {
if err := writeFile(path, "blkio.throttle.write_bps_device", td.String()); err != nil {
return err
}
}
for _, td := range cgroup.Resources.BlkioThrottleReadIOPSDevice {
if err := writeFile(path, "blkio.throttle.read_iops_device", td.String()); err != nil {
return err
}
}
for _, td := range cgroup.Resources.BlkioThrottleWriteIOPSDevice {
if err := writeFile(path, "blkio.throttle.write_iops_device", td.String()); err != nil {
return err
}
}
return nil
}
func (s *BlkioGroup) Remove(d *cgroupData) 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 splitBlkioStatLine(r rune) bool {
return r == ' ' || r == ':'
}
func getBlkioStat(path string) ([]cgroups.BlkioStatEntry, error) {
var blkioStats []cgroups.BlkioStatEntry
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return blkioStats, nil
}
return nil, err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
// format: dev type amount
fields := strings.FieldsFunc(sc.Text(), splitBlkioStatLine)
if len(fields) < 3 {
if len(fields) == 2 && fields[0] == "Total" {
// skip total line
continue
} else {
return nil, fmt.Errorf("Invalid line found while parsing %s: %s", path, sc.Text())
}
}
v, err := strconv.ParseUint(fields[0], 10, 64)
if err != nil {
return nil, err
}
major := v
v, err = strconv.ParseUint(fields[1], 10, 64)
if err != nil {
return nil, err
}
minor := v
op := ""
valueField := 2
if len(fields) == 4 {
op = fields[2]
valueField = 3
}
v, err = strconv.ParseUint(fields[valueField], 10, 64)
if err != nil {
return nil, err
}
blkioStats = append(blkioStats, cgroups.BlkioStatEntry{Major: major, Minor: minor, Op: op, Value: v})
}
return blkioStats, nil
}
func (s *BlkioGroup) GetStats(path string, stats *cgroups.Stats) error {
// Try to read CFQ stats available on all CFQ enabled kernels first
if blkioStats, err := getBlkioStat(filepath.Join(path, "blkio.io_serviced_recursive")); err == nil && blkioStats != nil {
return getCFQStats(path, stats)
}
return getStats(path, stats) // Use generic stats as fallback
}
func getCFQStats(path string, stats *cgroups.Stats) error {
var blkioStats []cgroups.BlkioStatEntry
var err error
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.sectors_recursive")); err != nil {
return err
}
stats.BlkioStats.SectorsRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_service_bytes_recursive")); err != nil {
return err
}
stats.BlkioStats.IoServiceBytesRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_serviced_recursive")); err != nil {
return err
}
stats.BlkioStats.IoServicedRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_queued_recursive")); err != nil {
return err
}
stats.BlkioStats.IoQueuedRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_service_time_recursive")); err != nil {
return err
}
stats.BlkioStats.IoServiceTimeRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_wait_time_recursive")); err != nil {
return err
}
stats.BlkioStats.IoWaitTimeRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.io_merged_recursive")); err != nil {
return err
}
stats.BlkioStats.IoMergedRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.time_recursive")); err != nil {
return err
}
stats.BlkioStats.IoTimeRecursive = blkioStats
return nil
}
func getStats(path string, stats *cgroups.Stats) error {
var blkioStats []cgroups.BlkioStatEntry
var err error
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.throttle.io_service_bytes")); err != nil {
return err
}
stats.BlkioStats.IoServiceBytesRecursive = blkioStats
if blkioStats, err = getBlkioStat(filepath.Join(path, "blkio.throttle.io_serviced")); err != nil {
return err
}
stats.BlkioStats.IoServicedRecursive = blkioStats
return nil
}
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