Added a new method cgroups.GetStats() which will return a cgroups.Stats object which will contain all the available cgroup Stats.

Remove old Stats interface in libcontainers cgroups package.
Changed Stats to use unit64 instead of int64 to prevent integer overflow issues.
Updated unit tests.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)

libcontainer/cgroups/fs/cpu.go

@@ -5,6 +5,8 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
+
+	"github.com/dotcloud/docker/pkg/libcontainer/cgroups"
 )
 
 type cpuGroup struct {
@@ -39,16 +41,15 @@ func (s *cpuGroup) Remove(d *data) error {
 	return removePath(d.path("cpu"))
 }
 
-func (s *cpuGroup) Stats(d *data) (map[string]int64, error) {
-	paramData := make(map[string]int64)
+func (s *cpuGroup) GetStats(d *data, stats *cgroups.Stats) error {
 	path, err := d.path("cpu")
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	f, err := os.Open(filepath.Join(path, "cpu.stat"))
 	if err != nil {
-		return nil, err
+		return err
 	}
 	defer f.Close()
 
@@ -56,9 +57,18 @@ func (s *cpuGroup) Stats(d *data) (map[string]int64, error) {
 	for sc.Scan() {
 		t, v, err := getCgroupParamKeyValue(sc.Text())
 		if err != nil {
-			return nil, err
+			return err
+		}
+		switch t {
+		case "nr_periods":
+			stats.CpuStats.ThrottlingData.Periods = v
+
+		case "nr_throttled":
+			stats.CpuStats.ThrottlingData.ThrottledPeriods = v
+
+		case "throttled_time":
+			stats.CpuStats.ThrottlingData.ThrottledTime = v
 		}
-		paramData[t] = v
 	}
-	return paramData, nil
+	return nil
 }