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kubelet/cm: rm propagateControllers

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This was added by commit a9772b2290.

In the current codebase, the cgroup being updated was created using
runc/opencontainers' manager.Apply(), which already does controllers
propagation, so there is no need to repeat that on every update.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin 2021-05-21 13:38:30 -07:00
parent fb3273774a
commit c299b8fc9a
1 changed files with 0 additions and 49 deletions
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49
pkg/kubelet/cm/cgroup_manager_linux.go
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@ -393,51 +393,6 @@ func getSupportedUnifiedControllers() sets.String {
return supportedControllers.Intersection(availableRootControllers)
}
// propagateControllers on an unified hierarchy enables all the supported controllers for the specified cgroup
func propagateControllers(path string) error {
if err := os.MkdirAll(filepath.Join(cmutil.CgroupRoot, path), 0755); err != nil {
return fmt.Errorf("failed to create cgroup %q : %v", path, err)
}
// Retrieve all the supported controllers from the cgroup root
controllersFileContent, err := ioutil.ReadFile(filepath.Join(cmutil.CgroupRoot, "cgroup.controllers"))
if err != nil {
return fmt.Errorf("failed to read controllers from %q : %v", cmutil.CgroupRoot, err)
}
supportedControllers := getSupportedUnifiedControllers()
// The retrieved content looks like: "cpuset cpu io memory hugetlb pids". Prepend each of the controllers
// with '+', so we have something like "+cpuset +cpu +io +memory +hugetlb +pids"
controllers := ""
for _, controller := range strings.Fields(string(controllersFileContent)) {
// ignore controllers we don't care about
if !supportedControllers.Has(controller) {
continue
}
sep := " +"
if controllers == "" {
sep = "+"
}
controllers = controllers + sep + controller
}
current := cmutil.CgroupRoot
// Write the controllers list to each "cgroup.subtree_control" file until it reaches the parent cgroup.
// For the /foo/bar/baz cgroup, controllers must be enabled sequentially in the files:
// - /sys/fs/cgroup/foo/cgroup.subtree_control
// - /sys/fs/cgroup/foo/bar/cgroup.subtree_control
for _, p := range strings.Split(filepath.Dir(path), "/") {
current = filepath.Join(current, p)
if err := ioutil.WriteFile(filepath.Join(current, "cgroup.subtree_control"), []byte(controllers), 0755); err != nil {
return fmt.Errorf("failed to enable controllers on %q: %v", cmutil.CgroupRoot, err)
}
}
return nil
}
func (m *cgroupManagerImpl) toResources(resourceConfig *ResourceConfig) *libcontainerconfigs.Resources {
resources := &libcontainerconfigs.Resources{
Devices: []*libcontainerdevices.Rule{
@ -535,10 +490,6 @@ func (m *cgroupManagerImpl) Update(cgroupConfig *CgroupConfig) error {
}
if unified {
if err := propagateControllers(libcontainerCgroupConfig.Path); err != nil {
return err
}
supportedControllers := getSupportedUnifiedControllers()
if !supportedControllers.Has("hugetlb") {
resources.HugetlbLimit = nil