diff options
Diffstat (limited to 'vendor/github.com/opencontainers')
| -rw-r--r-- | vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go | 10 | ||||
| -rw-r--r-- | vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go | 29 |
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 |