mirror of https://github.com/k3s-io/k3s
99 lines
3.1 KiB
Go
99 lines
3.1 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cm
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import (
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"fmt"
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"path"
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libcontainercgroups "github.com/opencontainers/runc/libcontainer/cgroups"
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cgroupfs "github.com/opencontainers/runc/libcontainer/cgroups/fs"
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libcontainerconfigs "github.com/opencontainers/runc/libcontainer/configs"
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)
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// cgroupSubsystems holds information about the mounted cgroup subsytems
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type cgroupSubsystems struct {
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// Cgroup subsystem mounts.
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// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
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mounts []libcontainercgroups.Mount
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// Cgroup subsystem to their mount location.
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// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
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mountPoints map[string]string
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}
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// GetCgroupSubsystems returns information about the mounted cgroup subsystems
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func getCgroupSubsystems() (*cgroupSubsystems, error) {
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// Get all cgroup mounts.
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allCgroups, err := libcontainercgroups.GetCgroupMounts()
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if err != nil {
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return &cgroupSubsystems{}, err
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}
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if len(allCgroups) == 0 {
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return &cgroupSubsystems{}, fmt.Errorf("failed to find cgroup mounts")
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}
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//TODO(@dubstack) should we trim to only the supported ones
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mountPoints := make(map[string]string, len(allCgroups))
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for _, mount := range allCgroups {
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for _, subsystem := range mount.Subsystems {
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mountPoints[subsystem] = mount.Mountpoint
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}
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}
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return &cgroupSubsystems{
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mounts: allCgroups,
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mountPoints: mountPoints,
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}, nil
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}
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// getLibcontainerCgroupManager returns libcontainer's cgroups manager
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// object with the specified cgroup configuration
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func getLibcontainerCgroupManager(cgroupConfig *CgroupConfig, subsystems *cgroupSubsystems) (*cgroupfs.Manager, error) {
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// get cgroup name
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name := cgroupConfig.Name
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// Get map of all cgroup paths on the system for the particular cgroup
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cgroupPaths := make(map[string]string, len(subsystems.mountPoints))
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for key, val := range subsystems.mountPoints {
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cgroupPaths[key] = path.Join(val, name)
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}
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// Extract the cgroup resource parameters
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resourceConfig := cgroupConfig.ResourceParameters
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resources := &libcontainerconfigs.Resources{}
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resources.AllowAllDevices = true
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if resourceConfig.Memory != nil {
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resources.Memory = *resourceConfig.Memory
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}
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if resourceConfig.CpuShares != nil {
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resources.CpuShares = *resourceConfig.CpuShares
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}
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if resourceConfig.CpuQuota != nil {
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resources.CpuQuota = *resourceConfig.CpuQuota
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}
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// Initialize libcontainer's cgroup config
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libcontainerCgroupConfig := &libcontainerconfigs.Cgroup{
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Name: path.Base(name),
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Parent: path.Dir(name),
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Resources: resources,
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}
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return &cgroupfs.Manager{
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Cgroups: libcontainerCgroupConfig,
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Paths: cgroupPaths,
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}, nil
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}
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