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virtcontainers: cgroups: Don't error if no thread ID

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In case the hypervisor implementation does not return any thread
ID, this should not issue any error since there is simply nothing
to constrain.

Fixes #1062

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2018-12-19 14:06:40 -08:00
parent b51c57e6fe
commit a21d1e693f
1 changed files with 7 additions and 1 deletions
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8
virtcontainers/cgroups.go
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@ -100,9 +100,15 @@ func (s *Sandbox) applyCPUCgroup(rc *specs.LinuxResources) error {
// when new container joins, new CPU could be hotplugged, so we
// have to query fresh vcpu info from hypervisor for every time.
tids, err := s.hypervisor.getThreadIDs()
if err != nil || tids == nil {
if err != nil {
return fmt.Errorf("failed to get thread ids from hypervisor: %v", err)
}
if tids == nil {
// 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
}
// use Add() to add vcpu thread to s.cgroup, it will write thread id to
// `cgroup.procs` which will move all threads in qemu process to this cgroup