• cgroup kata container


    https://github.com/kata-containers/documentation/blob/master/design/host-cgroups.md

    https://zhuanlan.zhihu.com/p/105230155

    https://blog.csdn.net/yuchunyu97/article/details/109241723

    https://github.com/kata-containers/runtime/issues/2090

    root@ubuntu:/opt/gopath/src/github.com/kata-containers# kata-runtime kata-env | grep SandboxCgroup
    SandboxCgroupOnly = false
    root@ubuntu:/opt/gopath/src/github.com/kata-containers#
    // constrainHypervisor will place the VMM and vCPU threads into cgroups.
    func (s *Sandbox) constrainHypervisor(cgroup cgroups.Cgroup) error {
        // VMM threads are only placed into the constrained cgroup if SandboxCgroupOnly is being set.
        // This is the "correct" behavior, but if the parent cgroup isn't set up correctly to take
        // Kata/VMM into account, Kata may fail to boot due to being overconstrained.
        // If !SandboxCgroupOnly, place the VMM into an unconstrained cgroup, and the vCPU threads into constrained
        // cgroup
        if s.config.SandboxCgroupOnly {
            // Kata components were moved into the sandbox-cgroup already, so VMM
            // will already land there as well. No need to take action
            return nil
        }
    
        pids := s.hypervisor.getPids()
        if len(pids) == 0 || pids[0] == 0 {
            return fmt.Errorf("Invalid hypervisor PID: %+v", pids)
        }
    
        // VMM threads are only placed into the constrained cgroup if SandboxCgroupOnly is being set.
        // This is the "correct" behavior, but if the parent cgroup isn't set up correctly to take
        // Kata/VMM into account, Kata may fail to boot due to being overconstrained.
        // If !SandboxCgroupOnly, place the VMM into an unconstrained cgroup, and the vCPU threads into constrained
        // cgroup
        // Move the VMM into cgroups without constraints, those cgroups are not yet supported.
        resources := &specs.LinuxResources{}
        path := cgroupNoConstraintsPath(s.state.CgroupPath)
        vmmCgroup, err := cgroupsNewFunc(V1NoConstraints, cgroups.StaticPath(path), resources)
        if err != nil {
            return fmt.Errorf("Could not create cgroup %v: %v", path, err)
        }
    
        for _, pid := range pids {
            if pid <= 0 {
                s.Logger().Warnf("Invalid hypervisor pid: %d", pid)
                continue
            }
    
            if err := vmmCgroup.Add(cgroups.Process{Pid: pid}); err != nil {
                return fmt.Errorf("Could not add hypervisor PID %d to cgroup: %v", pid, err)
            }
        }
    
        // when new container joins, new CPU could be hotplugged, so we
        // have to query fresh vcpu info from hypervisor every time.
        tids, err := s.hypervisor.getThreadIDs()
        if err != nil {
            return fmt.Errorf("failed to get thread ids from hypervisor: %v", err)
        }
        if len(tids.vcpus) == 0 {
            // If there's no tid returned from the hypervisor, this is not
            // a bug. It simply means there is nothing to constrain, hence
            // let's return without any error from here.
            return nil
        }
    
        // Move vcpus (threads) into cgroups with constraints.
        // Move whole hypervisor process would be easier but the IO/network performance
        // would be over-constrained.
        for _, i := range tids.vcpus {
            // In contrast, AddTask will write thread id to `tasks`
            // After this, vcpu threads are in "vcpu" sub-cgroup, other threads in
            // qemu will be left in parent cgroup untouched.
            if err := cgroup.AddTask(cgroups.Process{
                Pid: i,
            }); err != nil {
                return err
            }
        }
    
        return nil
    }
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  • 原文地址:https://www.cnblogs.com/dream397/p/13917815.html
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