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Use a []string for CgroupName, which is a more accurate internal representation

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The slice of strings more precisely captures the hierarchic nature of
the cgroup paths we use to represent pods and their groupings.

It also ensures we're reducing the chances of passing an incorrect path
format to a cgroup driver that requires a different path naming, since
now explicit conversions are always needed.

The new constructor NewCgroupName starts from an existing CgroupName,
which enforces a hierarchy where a root is always needed. It also
performs checking on the component names to ensure invalid characters
("/" and "_") are not in use.

A RootCgroupName for the top of the cgroup hierarchy tree is introduced.

This refactor results in a net reduction of around 30 lines of code,
mainly with the demise of ConvertCgroupNameToSystemd which had fairly
complicated logic in it and was doing just too many things.

There's a small TODO in a helper updateSystemdCgroupInfo that was
introduced to make this commit possible. That logic really belongs in
libcontainer, I'm planning to send a PR there to include it there.
(The API already takes a field with that information, only that field is
only processed in cgroupfs and not systemd driver, we should fix that.)

Tested by running the e2e-node tests on both Ubuntu 16.04 (with cgroupfs
driver) and CentOS 7 (with systemd driver.)
This commit is contained in:
Filipe Brandenburger
2018-03-27 21:11:00 -07:00
parent f03f83a20a
commit b230fb8ac4
16 changed files with 252 additions and 272 deletions
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12
pkg/kubelet/cm/pod_container_manager_linux.go
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@@ -104,7 +104,7 @@ func (m *podContainerManagerImpl) EnsureExists(pod *v1.Pod) error {
func (m *podContainerManagerImpl) GetPodContainerName(pod *v1.Pod) (CgroupName, string) {
podQOS := v1qos.GetPodQOS(pod)
// Get the parent QOS container name
var parentContainer string
var parentContainer CgroupName
switch podQOS {
case v1.PodQOSGuaranteed:
parentContainer = m.qosContainersInfo.Guaranteed
@@ -116,7 +116,7 @@ func (m *podContainerManagerImpl) GetPodContainerName(pod *v1.Pod) (CgroupName,
podContainer := GetPodCgroupNameSuffix(pod.UID)
// Get the absolute path of the cgroup
cgroupName := (CgroupName)(path.Join(parentContainer, podContainer))
cgroupName := NewCgroupName(parentContainer, podContainer)
// Get the literal cgroupfs name
cgroupfsName := m.cgroupManager.Name(cgroupName)
@@ -189,7 +189,7 @@ func (m *podContainerManagerImpl) ReduceCPULimits(podCgroup CgroupName) error {
func (m *podContainerManagerImpl) GetAllPodsFromCgroups() (map[types.UID]CgroupName, error) {
// Map for storing all the found pods on the disk
foundPods := make(map[types.UID]CgroupName)
qosContainersList := [3]string{m.qosContainersInfo.BestEffort, m.qosContainersInfo.Burstable, m.qosContainersInfo.Guaranteed}
qosContainersList := [3]CgroupName{m.qosContainersInfo.BestEffort, m.qosContainersInfo.Burstable, m.qosContainersInfo.Guaranteed}
// Scan through all the subsystem mounts
// and through each QoS cgroup directory for each subsystem mount
// If a pod cgroup exists in even a single subsystem mount
@@ -197,7 +197,7 @@ func (m *podContainerManagerImpl) GetAllPodsFromCgroups() (map[types.UID]CgroupN
for _, val := range m.subsystems.MountPoints {
for _, qosContainerName := range qosContainersList {
// get the subsystems QoS cgroup absolute name
qcConversion := m.cgroupManager.Name(CgroupName(qosContainerName))
qcConversion := m.cgroupManager.Name(qosContainerName)
qc := path.Join(val, qcConversion)
dirInfo, err := ioutil.ReadDir(qc)
if err != nil {
@@ -219,7 +219,7 @@ func (m *podContainerManagerImpl) GetAllPodsFromCgroups() (map[types.UID]CgroupN
internalPath := m.cgroupManager.CgroupName(cgroupfsPath)
// we only care about base segment of the converted path since that
// is what we are reading currently to know if it is a pod or not.
basePath := path.Base(string(internalPath))
basePath := internalPath[len(internalPath)-1]
if !strings.Contains(basePath, podCgroupNamePrefix) {
continue
}
@@ -259,7 +259,7 @@ func (m *podContainerManagerNoop) EnsureExists(_ *v1.Pod) error {
}
func (m *podContainerManagerNoop) GetPodContainerName(_ *v1.Pod) (CgroupName, string) {
return m.cgroupRoot, string(m.cgroupRoot)
return m.cgroupRoot, m.cgroupRoot.ToCgroupfs()
}
func (m *podContainerManagerNoop) GetPodContainerNameForDriver(_ *v1.Pod) string {