Function ToResources

cgroup2/utils.go:183–264

ToResources converts the oci LinuxResources struct into a v2 Resources type for use with this package. converting cgroups configuration from v1 to v2 ref: https://github.com/containers/crun/blob/master/crun.1.md#cgroup-v2

(spec *specs.LinuxResources)

// converting cgroups configuration from v1 to v2
// ref: https://github.com/containers/crun/blob/master/crun.1.md#cgroup-v2
func ToResources(spec *specs.LinuxResources) *Resources {
	var resources Resources
	if cpu := spec.CPU; cpu != nil {
		resources.CPU = &CPU{
			Cpus: cpu.Cpus,
			Mems: cpu.Mems,
		}
		if shares := cpu.Shares; shares != nil {
			convertedWeight := ConvertCPUSharesToCgroupV2Value(*shares)
			resources.CPU.Weight = &convertedWeight
		}
		if period := cpu.Period; period != nil {
			resources.CPU.Max = NewCPUMax(cpu.Quota, period)
		}
	}
	if mem := spec.Memory; mem != nil {
		resources.Memory = &Memory{}
		if swap := mem.Swap; swap != nil {
			resources.Memory.Swap = swap
			if l := mem.Limit; l != nil {
				reduce := *swap - *l
				resources.Memory.Swap = &reduce
			}
		}
		if l := mem.Limit; l != nil {
			resources.Memory.Max = l
		}
		if l := mem.Reservation; l != nil {
			resources.Memory.Low = l
		}
	}
	if hugetlbs := spec.HugepageLimits; hugetlbs != nil {
		hugeTlbUsage := HugeTlb{}
		for _, hugetlb := range hugetlbs {
			hugeTlbUsage = append(hugeTlbUsage, HugeTlbEntry{
				HugePageSize: hugetlb.Pagesize,
				Limit:        hugetlb.Limit,
			})
		}
		resources.HugeTlb = &hugeTlbUsage
	}
	if pids := spec.Pids; pids != nil && pids.Limit != nil {
		resources.Pids = &Pids{
			Max: *pids.Limit,
		}
	}
	if i := spec.BlockIO; i != nil {
		resources.IO = &IO{}
		if i.Weight != nil {
			resources.IO.BFQ.Weight = 1 + (*i.Weight-10)*9999/990
		}
		for t, devices := range map[IOType][]specs.LinuxThrottleDevice{
			ReadBPS:   i.ThrottleReadBpsDevice,
			WriteBPS:  i.ThrottleWriteBpsDevice,
			ReadIOPS:  i.ThrottleReadIOPSDevice,
			WriteIOPS: i.ThrottleWriteIOPSDevice,
		} {
			for _, d := range devices {