Set default sandbox container cpu shares on windows.

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/containerd/opts/spec.go

@@ -31,6 +31,10 @@ import (
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
+// DefaultSandboxCPUshares is default cpu shares for sandbox container.
+// TODO(windows): Revisit cpu shares for windows (https://github.com/containerd/cri/issues/1297)
+const DefaultSandboxCPUshares = 2
+
 // WithRelativeRoot sets the root for the container
 func WithRelativeRoot(root string) oci.SpecOpts {
 	return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {

pkg/containerd/opts/spec_unix.go

@@ -43,13 +43,6 @@ import (
 	"github.com/containerd/cri/pkg/util"
 )
 
-const (
-	// DefaultSandboxCPUshares is default cpu shares for sandbox container.
-	// TODO(windows): Evaluate whether this can be used for windows sandbox
-	// container cpu shares.
-	DefaultSandboxCPUshares = 2
-)
-
 // WithAdditionalGIDs adds any additional groups listed for a particular user in the
 // /etc/groups file of the image's root filesystem to the OCI spec's additionalGids array.
 func WithAdditionalGIDs(userstr string) oci.SpecOpts {

pkg/containerd/opts/spec_windows.go

@@ -172,3 +172,19 @@ func WithWindowsResources(resources *runtime.WindowsContainerResources) oci.Spec
 		return nil
 	}
 }
+
+// WithWindowsDefaultSandboxShares sets the default sandbox CPU shares
+func WithWindowsDefaultSandboxShares(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
+	if s.Windows == nil {
+		s.Windows = &runtimespec.Windows{}
+	}
+	if s.Windows.Resources == nil {
+		s.Windows.Resources = &runtimespec.WindowsResources{}
+	}
+	if s.Windows.Resources.CPU == nil {
+		s.Windows.Resources.CPU = &runtimespec.WindowsCPUResources{}
+	}
+	i := uint16(DefaultSandboxCPUshares)
+	s.Windows.Resources.CPU.Shares = &i
+	return nil
+}