api,adaptation,generate: allow setting container I/O priority.

README.md

@@ -181,6 +181,7 @@ The following pieces of container metadata are available to plugins in NRI:
   - mounts
   - OCI hooks
   - rlimits
+  - I/O priority
   - linux
     - namespace IDs
     - devices
@@ -227,6 +228,7 @@ container parameters:
   - environment variables
   - OCI hooks
   - rlimits
+  - I/O priority
   - linux
     - devices
     - resources

pkg/adaptation/adaptation_suite_test.go

@@ -514,6 +514,17 @@ var _ = Describe("Plugin container creation adjustments", func() {
 				},
 			)
 
+		case "I/O priority":
+			a.SetLinuxIOPriority(&nri.LinuxIOPriority{
+				Class:    api.IOPrioClass_IOPRIO_CLASS_RT,
+				Priority: 5,
+			})
+
+		case "clear I/O priority":
+			a.SetLinuxIOPriority(&nri.LinuxIOPriority{
+				Class: api.IOPrioClass_IOPRIO_CLASS_NONE,
+			})
+
 		case "resources/cpu":
 			a.SetLinuxCPUShares(123)
 			a.SetLinuxCPUQuota(456)
@@ -700,6 +711,25 @@ var _ = Describe("Plugin container creation adjustments", func() {
 					},
 				},
 			),
+
+			Entry("adjust I/O priority", "I/O priority",
+				&api.ContainerAdjustment{
+					Linux: &api.LinuxContainerAdjustment{
+						IoPriority: &api.LinuxIOPriority{
+							Class:    api.IOPrioClass_IOPRIO_CLASS_RT,
+							Priority: 5,
+						},
+					},
+				},
+			),
+			Entry("clear I/O priority", "clear I/O priority",
+				&api.ContainerAdjustment{
+					Linux: &api.LinuxContainerAdjustment{
+						IoPriority: &api.LinuxIOPriority{},
+					},
+				},
+			),
+
 			Entry("adjust CPU resources", "resources/cpu",
 				&api.ContainerAdjustment{
 					Linux: &api.LinuxContainerAdjustment{
@@ -921,6 +951,7 @@ var _ = Describe("Plugin container creation adjustments", func() {
 				},
 			),
 			Entry("adjust resources", "resources/classes", false, true, nil),
+			Entry("adjust I/O priority (conflicts)", "I/O priority", false, true, nil),
 		)
 	})
 

pkg/adaptation/api.go

@@ -89,6 +89,7 @@ type (
 	LinuxMemory              = api.LinuxMemory
 	LinuxDevice              = api.LinuxDevice
 	LinuxDeviceCgroup        = api.LinuxDeviceCgroup
+	LinuxIOPriority          = api.LinuxIOPriority
 	CDIDevice                = api.CDIDevice
 	HugepageLimit            = api.HugepageLimit
 	Hooks                    = api.Hooks
@@ -160,6 +161,7 @@ var (
 	FromOCILinuxNamespaces = api.FromOCILinuxNamespaces
 	FromOCILinuxDevices    = api.FromOCILinuxDevices
 	FromOCILinuxResources  = api.FromOCILinuxResources
+	FromOCILinuxIOPriority = api.FromOCILinuxIOPriority
 	DupStringSlice         = api.DupStringSlice
 	DupStringMap           = api.DupStringMap
 	IsMarkedForRemoval     = api.IsMarkedForRemoval

pkg/adaptation/result.go

@@ -221,6 +221,9 @@ func (r *result) adjust(rpl *ContainerAdjustment, plugin string) error {
 		if err := r.adjustOomScoreAdj(rpl.Linux.OomScoreAdj, plugin); err != nil {
 			return err
 		}
+		if err := r.adjustIOPriority(rpl.Linux.IoPriority, plugin); err != nil {
+			return err
+		}
 	}
 	if err := r.adjustRlimits(rpl.Rlimits, plugin); err != nil {
 		return err
@@ -773,6 +776,23 @@ func (r *result) adjustOomScoreAdj(OomScoreAdj *OptionalInt, plugin string) erro
 	return nil
 }
 
+func (r *result) adjustIOPriority(priority *LinuxIOPriority, plugin string) error {
+	if priority == nil {
+		return nil
+	}
+
+	create, id := r.request.create, r.request.create.Container.Id
+
+	if err := r.owners.ClaimIOPriority(id, plugin); err != nil {
+		return err
+	}
+
+	create.Container.Linux.IoPriority = priority
+	r.reply.adjust.Linux.IoPriority = priority
+
+	return nil
+}
+
 func (r *result) adjustRlimits(rlimits []*POSIXRlimit, plugin string) error {
 	create, id, adjust := r.request.create, r.request.create.Container.Id, r.reply.adjust
 	for _, l := range rlimits {

pkg/api/adjustment.go

@@ -283,6 +283,12 @@ func (a *ContainerAdjustment) SetLinuxOomScoreAdj(value *int) {
 	a.Linux.OomScoreAdj = Int(value) // using Int(value) from ./options.go to optionally allocate a pointer to normalized copy of value
 }
 
+// SetLinuxIOPriority records setting the I/O priority for a container.
+func (a *ContainerAdjustment) SetLinuxIOPriority(ioprio *LinuxIOPriority) {
+	a.initLinux()
+	a.Linux.IoPriority = ioprio
+}
+
 //
 // Initializing a container adjustment and container update.
 //