cpuset: don't set cpuset.mems in the guest

Kata doesn't map any numa topologies in the guest. Let's make sure we clear the Cpuset fields before passing container updates to the guest. Without this, we could encounter a runtime failure: ``` process_linux.go:297: applying cgroup configuration for process caused "failed to write 0,1 to cpuset.mems: writea 0,1 to cpuset.mems: write 0,1 to cpuset.mems: write /sys/fs/cgroup/cpuset .... /cpuset.mems: numerical result out of range"": unknown ``` Note, in the future we may want to have a vCPU to guest CPU mapping and still include the cpuset.Cpus. Until we have this support, clear this as well. Fixes: kata-containers#2176 Signed-off-by: Eric Ernst <[email protected]>
egernst · Sep 10, 2020 · d96296f · d96296f
1 parent 038a700
commit d96296f
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/virtcontainers/container.go b/virtcontainers/container.go
@@ -1275,6 +1275,14 @@ func (c *Container) update(resources specs.LinuxResources) error {
 		}
 	}
 
+	// There currently isn't a notion of cpusets.cpus or mems being tracked
+	// inside of the guest. Make sure we clear these before asking agent to update
+	// the container's cgroups.
+	if resources.CPU != nil {
+		resources.CPU.Mems = ""
+		resources.CPU.Cpus = ""
+	}
+
 	return c.sandbox.agent.updateContainer(c.sandbox, *c, resources)
 }