Docker stats: display Block IO stats

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>

api/client/stats.go

@@ -25,6 +25,8 @@ type containerStats struct {
 	MemoryPercentage float64
 	NetworkRx        float64
 	NetworkTx        float64
+	BlockRead        float64
+	BlockWrite       float64
 	mu               sync.RWMutex
 	err              error
 }
@@ -66,6 +68,7 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
 			previousCPU = v.PreCpuStats.CpuUsage.TotalUsage
 			previousSystem = v.PreCpuStats.SystemUsage
 			cpuPercent = calculateCPUPercent(previousCPU, previousSystem, v)
+			blkRead, blkWrite := calculateBlockIO(v.BlkioStats)
 			s.mu.Lock()
 			s.CPUPercentage = cpuPercent
 			s.Memory = float64(v.MemoryStats.Usage)
@@ -73,6 +76,8 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
 			s.MemoryPercentage = memPercent
 			s.NetworkRx = float64(v.Network.RxBytes)
 			s.NetworkTx = float64(v.Network.TxBytes)
+			s.BlockRead = float64(blkRead)
+			s.BlockWrite = float64(blkWrite)
 			s.mu.Unlock()
 			u <- nil
 			if !streamStats {
@@ -110,12 +115,13 @@ func (s *containerStats) Display(w io.Writer) error {
 	if s.err != nil {
 		return s.err
 	}
-	fmt.Fprintf(w, "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\n",
+	fmt.Fprintf(w, "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\t%s / %s\n",
 		s.Name,
 		s.CPUPercentage,
 		units.HumanSize(s.Memory), units.HumanSize(s.MemoryLimit),
 		s.MemoryPercentage,
-		units.HumanSize(s.NetworkRx), units.HumanSize(s.NetworkTx))
+		units.HumanSize(s.NetworkRx), units.HumanSize(s.NetworkTx),
+		units.HumanSize(s.BlockRead), units.HumanSize(s.BlockWrite))
 	return nil
 }
 
@@ -142,7 +148,7 @@ func (cli *DockerCli) CmdStats(args ...string) error {
 			fmt.Fprint(cli.out, "\033[2J")
 			fmt.Fprint(cli.out, "\033[H")
 		}
-		io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\n")
+		io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\tBLOCK I/O\n")
 	}
 	for _, n := range names {
 		s := &containerStats{Name: n}
@@ -200,3 +206,15 @@ func calculateCPUPercent(previousCPU, previousSystem uint64, v *types.Stats) flo
 	}
 	return cpuPercent
 }
+
+func calculateBlockIO(blkio types.BlkioStats) (blkRead uint64, blkWrite uint64) {
+	for _, bioEntry := range blkio.IoServiceBytesRecursive {
+		switch strings.ToLower(bioEntry.Op) {
+		case "read":
+			blkRead = bioEntry.Value
+		case "write":
+			blkWrite = bioEntry.Value
+		}
+	}
+	return
+}

api/client/stats_unit_test.go

@@ -15,6 +15,8 @@ func TestDisplay(t *testing.T) {
 		MemoryPercentage: 100.0 / 2048.0 * 100.0,
 		NetworkRx:        100 * 1024 * 1024,
 		NetworkTx:        800 * 1024 * 1024,
+		BlockRead:        100 * 1024 * 1024,
+		BlockWrite:       800 * 1024 * 1024,
 		mu:               sync.RWMutex{},
 	}
 	var b bytes.Buffer
@@ -22,7 +24,7 @@ func TestDisplay(t *testing.T) {
 		t.Fatalf("c.Display() gave error: %s", err)
 	}
 	got := b.String()
-	want := "app\t30.00%\t104.9 MB / 2.147 GB\t4.88%\t104.9 MB / 838.9 MB\n"
+	want := "app\t30.00%\t104.9 MB / 2.147 GB\t4.88%\t104.9 MB / 838.9 MB\t104.9 MB / 838.9 MB\n"
 	if got != want {
 		t.Fatalf("c.Display() = %q, want %q", got, want)
 	}

docs/articles/runmetrics.md

@@ -21,9 +21,9 @@ and network IO metrics.
 The following is a sample output from the `docker stats` command
 
     $ docker stats redis1 redis2
-    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O
-    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B
-    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B
+    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O
+    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B       3.568 MB / 512 KB
+    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B    12.4 MB / 0 B
 
 
 The [docker stats](/reference/commandline/stats/) reference page has

docs/reference/commandline/stats.md

@@ -21,9 +21,9 @@ weight=1
 Running `docker stats` on multiple containers
 
     $ docker stats redis1 redis2
-    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O
-    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B
-    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B
+    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O
+    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B       3.568 MB / 512 KB
+    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B    12.4 MB / 0 B
 
 
 The `docker stats` command will only return a live stream of data for running

man/docker-stats.1.md

@@ -25,6 +25,6 @@ Display a live stream of one or more containers' resource usage statistics
 Run **docker stats** with multiple containers.
 
     $ docker stats redis1 redis2
-    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O
-    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B
-    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B
+    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O
+    redis1              0.07%               796 KB / 64 MB        1.21%               788 B / 648 B       3.568 MB / 512 KB
+    redis2              0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B    12.4 MB / 0 B