libcontainer: add test cases for Intel RDT/CAT

Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>

libcontainer/container_linux_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/opencontainers/runc/libcontainer/cgroups"
 	"github.com/opencontainers/runc/libcontainer/configs"
+	"github.com/opencontainers/runc/libcontainer/intelrdt"
 	"github.com/opencontainers/runc/libcontainer/system"
 )
 
@@ -19,6 +20,11 @@ type mockCgroupManager struct {
 	paths   map[string]string
 }
 
+type mockIntelRdtManager struct {
+	stats *intelrdt.Stats
+	path  string
+}
+
 func (m *mockCgroupManager) GetPids() ([]int, error) {
 	return m.pids, nil
 }
@@ -51,6 +57,26 @@ func (m *mockCgroupManager) Freeze(state configs.FreezerState) error {
 	return nil
 }
 
+func (m *mockIntelRdtManager) Apply(pid int) error {
+	return nil
+}
+
+func (m *mockIntelRdtManager) GetStats() (*intelrdt.Stats, error) {
+	return m.stats, nil
+}
+
+func (m *mockIntelRdtManager) Destroy() error {
+	return nil
+}
+
+func (m *mockIntelRdtManager) GetPath() string {
+	return m.path
+}
+
+func (m *mockIntelRdtManager) Set(container *configs.Config) error {
+	return nil
+}
+
 type mockProcess struct {
 	_pid    int
 	started uint64
@@ -118,6 +144,11 @@ func TestGetContainerStats(t *testing.T) {
 				},
 			},
 		},
+		intelRdtManager: &mockIntelRdtManager{
+			stats: &intelrdt.Stats{
+				L3CacheSchema: "L3:0=f;1=f0",
+			},
+		},
 	}
 	stats, err := container.Stats()
 	if err != nil {
@@ -129,13 +160,22 @@ func TestGetContainerStats(t *testing.T) {
 	if stats.CgroupStats.MemoryStats.Usage.Usage != 1024 {
 		t.Fatalf("expected memory usage 1024 but recevied %d", stats.CgroupStats.MemoryStats.Usage.Usage)
 	}
+	if intelrdt.IsIntelRdtEnabled() {
+		if stats.IntelRdtStats == nil {
+			t.Fatal("intel rdt stats are nil")
+		}
+		if stats.IntelRdtStats.L3CacheSchema != "L3:0=f;1=f0" {
+			t.Fatalf("expected L3CacheSchema L3:0=f;1=f0 but recevied %s", stats.IntelRdtStats.L3CacheSchema)
+		}
+	}
 }
 
 func TestGetContainerState(t *testing.T) {
 	var (
-		pid                 = os.Getpid()
-		expectedMemoryPath  = "/sys/fs/cgroup/memory/myid"
-		expectedNetworkPath = fmt.Sprintf("/proc/%d/ns/net", pid)
+		pid                  = os.Getpid()
+		expectedMemoryPath   = "/sys/fs/cgroup/memory/myid"
+		expectedNetworkPath  = fmt.Sprintf("/proc/%d/ns/net", pid)
+		expectedIntelRdtPath = "/sys/fs/resctrl/myid"
 	)
 	container := &linuxContainer{
 		id: "myid",
@@ -166,6 +206,12 @@ func TestGetContainerState(t *testing.T) {
 				"memory": expectedMemoryPath,
 			},
 		},
+		intelRdtManager: &mockIntelRdtManager{
+			stats: &intelrdt.Stats{
+				L3CacheSchema: "L3:0=f0;1=f",
+			},
+			path: expectedIntelRdtPath,
+		},
 	}
 	container.state = &createdState{c: container}
 	state, err := container.State()
@@ -185,6 +231,15 @@ func TestGetContainerState(t *testing.T) {
 	if memPath := paths["memory"]; memPath != expectedMemoryPath {
 		t.Fatalf("expected memory path %q but received %q", expectedMemoryPath, memPath)
 	}
+	if intelrdt.IsIntelRdtEnabled() {
+		intelRdtPath := state.IntelRdtPath
+		if intelRdtPath == "" {
+			t.Fatal("intel rdt path should not be empty")
+		}
+		if intelRdtPath != expectedIntelRdtPath {
+			t.Fatalf("expected intel rdt path %q but received %q", expectedIntelRdtPath, intelRdtPath)
+		}
+	}
 	for _, ns := range container.config.Namespaces {
 		path := state.NamespacePaths[ns.Type]
 		if path == "" {

libcontainer/factory_linux_test.go

@@ -50,6 +50,32 @@ func TestFactoryNew(t *testing.T) {
 	}
 }
 
+func TestFactoryNewIntelRdt(t *testing.T) {
+	root, rerr := newTestRoot()
+	if rerr != nil {
+		t.Fatal(rerr)
+	}
+	defer os.RemoveAll(root)
+	factory, err := New(root, Cgroupfs, IntelRdtFs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if factory == nil {
+		t.Fatal("factory should not be nil")
+	}
+	lfactory, ok := factory.(*LinuxFactory)
+	if !ok {
+		t.Fatal("expected linux factory returned on linux based systems")
+	}
+	if lfactory.Root != root {
+		t.Fatalf("expected factory root to be %q but received %q", root, lfactory.Root)
+	}
+
+	if factory.Type() != "libcontainer" {
+		t.Fatalf("unexpected factory type: %q, expected %q", factory.Type(), "libcontainer")
+	}
+}
+
 func TestFactoryNewTmpfs(t *testing.T) {
 	root, rerr := newTestRoot()
 	if rerr != nil {
@@ -164,7 +190,7 @@ func TestFactoryLoadContainer(t *testing.T) {
 	if err := marshal(filepath.Join(root, id, stateFilename), expectedState); err != nil {
 		t.Fatal(err)
 	}
-	factory, err := New(root, Cgroupfs)
+	factory, err := New(root, Cgroupfs, IntelRdtFs)
 	if err != nil {
 		t.Fatal(err)
 	}

libcontainer/intelrdt/intelrdt_test.go

@@ -0,0 +1,46 @@
+// +build linux
+
+package intelrdt
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestIntelRdtSetL3CacheSchema(t *testing.T) {
+	if !IsIntelRdtEnabled() {
+		return
+	}
+
+	helper := NewIntelRdtTestUtil(t)
+	defer helper.cleanup()
+
+	const (
+		l3CacheSchemaBefore = "L3:0=f;1=f0"
+		l3CacheSchemeAfter  = "L3:0=f0;1=f"
+	)
+
+	helper.writeFileContents(map[string]string{
+		"schemata": l3CacheSchemaBefore + "\n",
+	})
+
+	helper.IntelRdtData.config.IntelRdt.L3CacheSchema = l3CacheSchemeAfter
+	intelrdt := &IntelRdtManager{
+		Config: helper.IntelRdtData.config,
+		Path:   helper.IntelRdtPath,
+	}
+	if err := intelrdt.Set(helper.IntelRdtData.config); err != nil {
+		t.Fatal(err)
+	}
+
+	tmpStrings, err := getIntelRdtParamString(helper.IntelRdtPath, "schemata")
+	if err != nil {
+		t.Fatalf("Failed to parse file 'schemata' - %s", err)
+	}
+	values := strings.Split(tmpStrings, "\n")
+	value := values[0]
+
+	if value != l3CacheSchemeAfter {
+		t.Fatal("Got the wrong value, set 'schemata' failed.")
+	}
+}

libcontainer/intelrdt/util_test.go

@@ -0,0 +1,67 @@
+// +build linux
+
+/*
+ * Utility for testing Intel RDT operations.
+ * Creates a mock of the Intel RDT "resource control" filesystem for the duration of the test.
+ */
+package intelrdt
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type intelRdtTestUtil struct {
+	// intelRdt data to use in tests
+	IntelRdtData *intelRdtData
+
+	// Path to the mock Intel RDT "resource control" filesystem directory
+	IntelRdtPath string
+
+	// Temporary directory to store mock Intel RDT "resource control" filesystem
+	tempDir string
+	t       *testing.T
+}
+
+// Creates a new test util
+func NewIntelRdtTestUtil(t *testing.T) *intelRdtTestUtil {
+	d := &intelRdtData{
+		config: &configs.Config{
+			IntelRdt: &configs.IntelRdt{},
+		},
+	}
+	tempDir, err := ioutil.TempDir("", "intelrdt_test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	d.root = tempDir
+	testIntelRdtPath := filepath.Join(d.root, "resctrl")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Ensure the full mock Intel RDT "resource control" filesystem path exists
+	err = os.MkdirAll(testIntelRdtPath, 0755)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return &intelRdtTestUtil{IntelRdtData: d, IntelRdtPath: testIntelRdtPath, tempDir: tempDir, t: t}
+}
+
+func (c *intelRdtTestUtil) cleanup() {
+	os.RemoveAll(c.tempDir)
+}
+
+// Write the specified contents on the mock of the specified Intel RDT "resource control" files
+func (c *intelRdtTestUtil) writeFileContents(fileContents map[string]string) {
+	for file, contents := range fileContents {
+		err := writeFile(c.IntelRdtPath, file, contents)
+		if err != nil {
+			c.t.Fatal(err)
+		}
+	}
+}