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-rw-r--r--vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go10
-rw-r--r--vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go29
2 files changed, 34 insertions, 5 deletions
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go
index 25ff51589..c0a965923 100644
--- a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go
+++ b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go
@@ -37,8 +37,18 @@ type Manager interface {
// restore the object later.
GetPaths() map[string]string
+ // GetUnifiedPath returns the unified path when running in unified mode.
+ // The value corresponds to the all values of GetPaths() map.
+ //
+ // GetUnifiedPath returns error when running in hybrid mode as well as
+ // in legacy mode.
+ GetUnifiedPath() (string, error)
+
// Sets the cgroup as configured.
Set(container *configs.Config) error
+
+ // Gets the cgroup as configured.
+ GetCgroups() (*configs.Cgroup, error)
}
type NotFoundError struct {
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go
index 60790f83b..dbcc58f5b 100644
--- a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go
+++ b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go
@@ -20,8 +20,9 @@ import (
)
const (
- CgroupNamePrefix = "name="
- CgroupProcesses = "cgroup.procs"
+ CgroupNamePrefix = "name="
+ CgroupProcesses = "cgroup.procs"
+ unifiedMountpoint = "/sys/fs/cgroup"
)
var (
@@ -40,7 +41,7 @@ var HugePageSizeUnitList = []string{"B", "KB", "MB", "GB", "TB", "PB"}
func IsCgroup2UnifiedMode() bool {
isUnifiedOnce.Do(func() {
var st syscall.Statfs_t
- if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
+ if err := syscall.Statfs(unifiedMountpoint, &st); err != nil {
panic("cannot statfs cgroup root")
}
isUnified = st.Type == unix.CGROUP2_SUPER_MAGIC
@@ -50,6 +51,9 @@ func IsCgroup2UnifiedMode() bool {
// https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt
func FindCgroupMountpoint(cgroupPath, subsystem string) (string, error) {
+ if IsCgroup2UnifiedMode() {
+ return unifiedMountpoint, nil
+ }
mnt, _, err := FindCgroupMountpointAndRoot(cgroupPath, subsystem)
return mnt, err
}
@@ -235,8 +239,8 @@ func GetCgroupMounts(all bool) ([]Mount, error) {
return nil, err
}
m := Mount{
- Mountpoint: "/sys/fs/cgroup",
- Root: "/sys/fs/cgroup",
+ Mountpoint: unifiedMountpoint,
+ Root: unifiedMountpoint,
Subsystems: availableControllers,
}
return []Mount{m}, nil
@@ -262,6 +266,21 @@ func GetCgroupMounts(all bool) ([]Mount, error) {
// GetAllSubsystems returns all the cgroup subsystems supported by the kernel
func GetAllSubsystems() ([]string, error) {
+ // /proc/cgroups is meaningless for v2
+ // https://github.com/torvalds/linux/blob/v5.3/Documentation/admin-guide/cgroup-v2.rst#deprecated-v1-core-features
+ if IsCgroup2UnifiedMode() {
+ // "pseudo" controllers do not appear in /sys/fs/cgroup/cgroup.controllers.
+ // - devices: implemented in kernel 4.15
+ // - freezer: implemented in kernel 5.2
+ // We assume these are always available, as it is hard to detect availability.
+ pseudo := []string{"devices", "freezer"}
+ data, err := ioutil.ReadFile("/sys/fs/cgroup/cgroup.controllers")
+ if err != nil {
+ return nil, err
+ }
+ subsystems := append(pseudo, strings.Fields(string(data))...)
+ return subsystems, nil
+ }
f, err := os.Open("/proc/cgroups")
if err != nil {
return nil, err