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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package libcontainer
import (
"fmt"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/container"
"github.com/opencontainers/runc/libcontainer/cgroups"
fs "github.com/opencontainers/runc/libcontainer/cgroups/fs"
fs2 "github.com/opencontainers/runc/libcontainer/cgroups/fs2"
configs "github.com/opencontainers/runc/libcontainer/configs"
"k8s.io/klog/v2"
)
type CgroupSubsystems struct {
// Cgroup subsystem mounts.
// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
Mounts []cgroups.Mount
// Cgroup subsystem to their mount location.
// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
MountPoints map[string]string
}
// Get information about the cgroup subsystems those we want
func GetCgroupSubsystems(includedMetrics container.MetricSet) (CgroupSubsystems, error) {
// Get all cgroup mounts.
allCgroups, err := cgroups.GetCgroupMounts(true)
if err != nil {
return CgroupSubsystems{}, err
}
disableCgroups := map[string]struct{}{}
//currently we only support disable blkio subsystem
if !includedMetrics.Has(container.DiskIOMetrics) {
disableCgroups["blkio"] = struct{}{}
disableCgroups["io"] = struct{}{}
}
return getCgroupSubsystemsHelper(allCgroups, disableCgroups)
}
// Get information about all the cgroup subsystems.
func GetAllCgroupSubsystems() (CgroupSubsystems, error) {
// Get all cgroup mounts.
allCgroups, err := cgroups.GetCgroupMounts(true)
if err != nil {
return CgroupSubsystems{}, err
}
emptyDisableCgroups := map[string]struct{}{}
return getCgroupSubsystemsHelper(allCgroups, emptyDisableCgroups)
}
func getCgroupSubsystemsHelper(allCgroups []cgroups.Mount, disableCgroups map[string]struct{}) (CgroupSubsystems, error) {
if len(allCgroups) == 0 {
return CgroupSubsystems{}, fmt.Errorf("failed to find cgroup mounts")
}
// Trim the mounts to only the subsystems we care about.
supportedCgroups := make([]cgroups.Mount, 0, len(allCgroups))
recordedMountpoints := make(map[string]struct{}, len(allCgroups))
mountPoints := make(map[string]string, len(allCgroups))
for _, mount := range allCgroups {
for _, subsystem := range mount.Subsystems {
if _, exists := disableCgroups[subsystem]; exists {
continue
}
if _, ok := supportedSubsystems[subsystem]; !ok {
// Unsupported subsystem
continue
}
if _, ok := mountPoints[subsystem]; ok {
// duplicate mount for this subsystem; use the first one we saw
klog.V(5).Infof("skipping %s, already using mount at %s", mount.Mountpoint, mountPoints[subsystem])
continue
}
if _, ok := recordedMountpoints[mount.Mountpoint]; !ok {
// avoid appending the same mount twice in e.g. `cpu,cpuacct` case
supportedCgroups = append(supportedCgroups, mount)
recordedMountpoints[mount.Mountpoint] = struct{}{}
}
mountPoints[subsystem] = mount.Mountpoint
}
}
return CgroupSubsystems{
Mounts: supportedCgroups,
MountPoints: mountPoints,
}, nil
}
// Cgroup subsystems we support listing (should be the minimal set we need stats from).
var supportedSubsystems map[string]struct{} = map[string]struct{}{
"cpu": {},
"cpuacct": {},
"memory": {},
"hugetlb": {},
"pids": {},
"cpuset": {},
"blkio": {},
"io": {},
"devices": {},
"perf_event": {},
}
func DiskStatsCopy0(major, minor uint64) *info.PerDiskStats {
disk := info.PerDiskStats{
Major: major,
Minor: minor,
}
disk.Stats = make(map[string]uint64)
return &disk
}
type DiskKey struct {
Major uint64
Minor uint64
}
func DiskStatsCopy1(diskStat map[DiskKey]*info.PerDiskStats) []info.PerDiskStats {
i := 0
stat := make([]info.PerDiskStats, len(diskStat))
for _, disk := range diskStat {
stat[i] = *disk
i++
}
return stat
}
func DiskStatsCopy(blkioStats []cgroups.BlkioStatEntry) (stat []info.PerDiskStats) {
if len(blkioStats) == 0 {
return
}
diskStat := make(map[DiskKey]*info.PerDiskStats)
for i := range blkioStats {
major := blkioStats[i].Major
minor := blkioStats[i].Minor
key := DiskKey{
Major: major,
Minor: minor,
}
diskp, ok := diskStat[key]
if !ok {
diskp = DiskStatsCopy0(major, minor)
diskStat[key] = diskp
}
op := blkioStats[i].Op
if op == "" {
op = "Count"
}
diskp.Stats[op] = blkioStats[i].Value
}
return DiskStatsCopy1(diskStat)
}
func NewCgroupManager(name string, paths map[string]string) (cgroups.Manager, error) {
if cgroups.IsCgroup2UnifiedMode() {
path := paths["cpu"]
return fs2.NewManager(nil, path, false)
}
config := configs.Cgroup{
Name: name,
}
return fs.NewManager(&config, paths, false), nil
}
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