set up CPU and Memory resources

Signed-off-by: Haiyan Meng <hmeng@redhat.com>

cmd/client/podsandboxconfig.json

@@ -29,12 +29,12 @@
 	],
 	"resources": {
 		"cpu": {
-			"limits": 50000000,
-			"requests": 20000000
+			"limits": 3,
+			"requests": 2
 		},
 		"memory": {
-			"limits": 500000000000,
-			"requests": 200000000000
+			"limits": 50000000,
+			"requests": 2000000
 		}
 	},
 	"labels": {

server/const.go

@@ -5,3 +5,12 @@ const (
 	// "The search list is currently limited to six domains with a total of 256 characters."
 	maxDNSSearches = 6
 )
+
+const (
+	// by default, cpu.cfs_period_us is set to be 1000000 (i.e., 1s).
+	defaultCPUCFSPeriod = 1000000
+	// the upper limit of cpu.cfs_quota_us is 1000000.
+	maxCPUCFSQuota = 1000000
+	// the lower limit of cpu.cfs_quota_us is 1000.
+	minCPUCFSQuota = 1000
+)

server/runtime.go

@@ -87,30 +87,6 @@ func (s *Server) CreatePodSandbox(ctx context.Context, req *pb.CreatePodSandboxR
 		return nil, err
 	}
 
-	// TODO: the unit of cpu here is cores. How to map it into specs.Spec.Linux.Resouces.CPU?
-	cpu := req.GetConfig().GetResources().GetCpu()
-	if cpu != nil {
-		limits := cpu.GetLimits()
-		requests := cpu.GetRequests()
-		fmt.Println(limits)
-		fmt.Println(requests)
-	}
-
-	memory := req.GetConfig().GetResources().GetMemory()
-	if memory != nil {
-		// limits sets specs.Spec.Linux.Resouces.Memory.Limit
-		limits := memory.GetLimits()
-		if limits != 0 {
-			g.SetLinuxResourcesMemoryLimit(uint64(limits))
-		}
-
-		// requests sets specs.Spec.Linux.Resouces.Memory.Reservation
-		requests := memory.GetRequests()
-		if requests != 0 {
-			g.SetLinuxResourcesMemoryReservation(uint64(requests))
-		}
-	}
-
 	labels := req.GetConfig().GetLabels()
 	s.sandboxes = append(s.sandboxes, &sandbox{
 		name:   name,

server/utils.go

@@ -8,6 +8,8 @@ import (
 	"path/filepath"
 	"runtime"
 	"strings"
+
+	"github.com/opencontainers/ocitools/generate"
 )
 
 func getGPRCVersion() (string, error) {
@@ -91,3 +93,62 @@ func parseDNSOptions(servers, searches []string, path string) error {
 
 	return nil
 }
+
+// kubernetes compute resources - CPU: http://kubernetes.io/docs/user-guide/compute-resources/#meaning-of-cpu
+func setResourcesCPU(limits, requests, defaultCores float64, g generate.Generator) error {
+	if requests > limits {
+		return fmt.Errorf("CPU.Requests should not be greater than CPU.Limits")
+	}
+
+	cores := defaultCores
+	if limits != 0 || requests != 0 {
+		if limits > requests {
+			cores = limits
+		} else {
+			cores = requests
+		}
+	}
+
+	period := uint64(defaultCPUCFSPeriod)
+	quota := uint64(float64(period) * cores)
+
+	if quota < minCPUCFSQuota {
+		quota = minCPUCFSQuota
+	}
+
+	// adjust quota and period for the case where multiple CPUs are requested
+	// so that cpu.cfs_quota_us <= maxCPUCFSQuota.
+	for quota > maxCPUCFSQuota {
+		quota /= 10
+		period /= 10
+	}
+
+	g.SetLinuxResourcesCPUPeriod(period)
+	g.SetLinuxResourcesCPUQuota(quota)
+	return nil
+}
+
+// kubernetes compute resources - Memory: http://kubernetes.io/docs/user-guide/compute-resources/#meaning-of-memory
+func setResourcesMemory(limits, requests, defaultMem float64, g generate.Generator) error {
+	if requests > limits {
+		return fmt.Errorf("Memory.Requests should not be greater than Memory.Limits")
+	}
+
+	if limits != 0 {
+		if requests == 0 {
+			requests = limits
+		}
+	} else {
+		if requests == 0 {
+			// set the default values of limits and requests
+			requests = defaultMem
+			limits = defaultMem
+		} else {
+			limits = requests
+		}
+	}
+
+	g.SetLinuxResourcesMemoryLimit(uint64(limits))
+	g.SetLinuxResourcesMemoryReservation(uint64(requests))
+	return nil
+}