config: Add default_{vcpus, memory} configurations

Introduce two new configuration settings:
 * default_vcpus - defines default vCPU number for newly created PODs
 * default_memory - defines default memory size for newly created PODs

Fixes #164.

Signed-off-by: Dmitry Voytik <[email protected]>

Makefile

@@ -92,6 +92,9 @@ PAUSEBINRELPATH := bin/pause
 
 GLOBALLOGPATH := $(PKGLIBDIR)/runtime/runtime.log
 
+DEFDEFVCPUS := 1
+DEFDEFMEMSZ := 2048
+
 SED = sed
 
 SOURCES := $(shell find . 2>&1 | grep -E '.*\.(c|h|go)$$')
@@ -139,6 +142,8 @@ USER_VARS += SHAREDIR
 USER_VARS += SHIMPATH
 USER_VARS += SYSCONFDIR
 USER_VARS += PAUSEDESTDIR
+USER_VARS += DEFDEFVCPUS
+USER_VARS += DEFDEFMEMSZ
 
 
 V              = @
@@ -178,6 +183,9 @@ const defaultRuntimeRun = "$(PKGRUNDIR)"
 const defaultShimPath = "$(SHIMPATH)"
 const pauseBinRelativePath = "$(PAUSEBINRELPATH)"
 
+const defaultDefaultVCPUs uint32 = $(DEFDEFVCPUS)
+const defaultDefaultMemSz uint32 = $(DEFDEFMEMSZ)
+
 // Required to be modifiable (for the tests)
 var defaultRuntimeConfiguration = "$(DESTCONFIG)"
 var defaultProxyPath = "$(PROXYPATH)"
@@ -223,6 +231,8 @@ $(CONFIG): $(CONFIG_IN)
 		-e "s|@QEMUPATH@|$(QEMUPATH)|g" \
 		-e "s|@SHIMPATH@|$(SHIMPATH)|g" \
 		-e "s|@GLOBALLOGPATH@|$(GLOBALLOGPATH)|g" \
+		-e "s|@DEFDEFVCPUS@|$(DEFDEFVCPUS)|g" \
+		-e "s|@DEFDEFMEMSZ@|$(DEFDEFMEMSZ)|g" \
 		$< > $@
 
 generate-config: $(CONFIG)

config.go

@@ -20,6 +20,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	goruntime "runtime"
 
 	"github.com/BurntSushi/toml"
 	vc "github.com/containers/virtcontainers"
@@ -73,9 +74,11 @@ type tomlConfig struct {
 }
 
 type hypervisor struct {
-	Path   string
-	Kernel string
-	Image  string
+	Path         string
+	Kernel       string
+	Image        string
+	DefaultVCPUs int32  `toml:"default_vcpus"`
+	DefaultMemSz uint32 `toml:"default_memory"`
 }
 
 type proxy struct {
@@ -118,6 +121,28 @@ func (h hypervisor) image() string {
 	return h.Image
 }
 
+func (h hypervisor) defaultVCPUs() uint32 {
+	if h.DefaultVCPUs < 0 {
+		return uint32(goruntime.NumCPU())
+	}
+	if h.DefaultVCPUs == 0 { // or unspecified
+		return defaultDefaultVCPUs
+	}
+	if h.DefaultVCPUs > 255 { // qemu supports max 255
+		return 255
+	}
+
+	return uint32(h.DefaultVCPUs)
+}
+
+func (h hypervisor) defaultMemSz() uint32 {
+	if h.DefaultMemSz < 8 {
+		return defaultDefaultMemSz // MiB
+	}
+
+	return h.DefaultMemSz
+}
+
 func (p proxy) url() string {
 	if p.URL == "" {
 		return defaultProxyURL
@@ -158,6 +183,8 @@ func newQemuHypervisorConfig(h hypervisor) (vc.HypervisorConfig, error) {
 		HypervisorPath: hypervisor,
 		KernelPath:     kernel,
 		ImagePath:      image,
+		DefaultVCPUs:   h.defaultVCPUs(),
+		DefaultMemSz:   h.defaultMemSz(),
 	}, nil
 }
 
@@ -264,6 +291,8 @@ func loadConfiguration(configPath string, ignoreLogging bool) (resolvedConfigPat
 		HypervisorPath: defaultHypervisorPath,
 		KernelPath:     defaultKernelPath,
 		ImagePath:      defaultImagePath,
+		DefaultVCPUs:   defaultDefaultVCPUs,
+		DefaultMemSz:   defaultDefaultMemSz,
 	}
 
 	defaultAgentConfig := vc.HyperConfig{

config/configuration.toml.in

@@ -4,6 +4,14 @@
 path = "@QEMUPATH@"
 kernel = "@KERNELPATH@"
 image = "@IMAGEPATH@"
+# Default vCPU number per POD/VM:
+# unspecified or 0 --> will be set to @DEFDEFVCPUS@
+# < 0              --> will be set to the actual number of physical cores
+# > 255            --> will be set to 255.
+default_vcpus = -1
+# Default memory size in MiB for POD/VM.
+# If unspecified then it will be set @DEFDEFMEMSZ@
+#default_memory = @DEFDEFMEMSZ@
 
 [proxy.cc]
 url = "@PROXYURL@"

config_test.go

@@ -21,6 +21,8 @@ import (
 	"path"
 	"path/filepath"
 	"reflect"
+	goruntime "runtime"
+	"strconv"
 	"strings"
 	"syscall"
 	"testing"
@@ -49,6 +51,8 @@ func makeRuntimeConfigFileData(hypervisor, hypervisorPath, kernelPath, imagePath
 	path = "` + hypervisorPath + `"
 	kernel = "` + kernelPath + `"
 	image = "` + imagePath + `"
+	default_vcpus = ` + strconv.FormatUint(uint64(defaultDefaultVCPUs), 10) + `
+	default_memory = ` + strconv.FormatUint(uint64(defaultDefaultMemSz), 10) + `
 
 	[proxy.cc]
 	url = "` + proxyURL + `"
@@ -131,6 +135,8 @@ func createAllRuntimeConfigFiles(dir, hypervisor string) (config testRuntimeConf
 		HypervisorPath: hypervisorPath,
 		KernelPath:     kernelPath,
 		ImagePath:      imagePath,
+		DefaultVCPUs:   defaultDefaultVCPUs,
+		DefaultMemSz:   defaultDefaultMemSz,
 	}
 
 	agentConfig := vc.HyperConfig{
@@ -586,6 +592,8 @@ func TestMinimalRuntimeConfig(t *testing.T) {
 		HypervisorPath: defaultHypervisorPath,
 		KernelPath:     defaultKernelPath,
 		ImagePath:      defaultImagePath,
+		DefaultVCPUs:   defaultDefaultVCPUs,
+		DefaultMemSz:   defaultDefaultMemSz,
 	}
 
 	expectedAgentConfig := vc.HyperConfig{
@@ -770,6 +778,8 @@ func TestHypervisorDefaults(t *testing.T) {
 	assert.Equal(t, h.path(), defaultHypervisorPath, "default hypervisor path wrong")
 	assert.Equal(t, h.kernel(), defaultKernelPath, "default hypervisor kernel wrong")
 	assert.Equal(t, h.image(), defaultImagePath, "default hypervisor image wrong")
+	assert.Equal(t, h.defaultVCPUs(), defaultDefaultVCPUs, "default vCPU number is wrong")
+	assert.Equal(t, h.defaultMemSz(), defaultDefaultMemSz, "default memory size is wrong")
 
 	path := "/foo"
 	h.Path = path
@@ -782,6 +792,20 @@ func TestHypervisorDefaults(t *testing.T) {
 	image := "foo"
 	h.Image = image
 	assert.Equal(t, h.image(), image, "custom hypervisor image wrong")
+
+	// auto inferring
+	h.DefaultVCPUs = -1
+	assert.Equal(t, h.defaultVCPUs(), uint32(goruntime.NumCPU()), "default vCPU number is wrong")
+
+	h.DefaultVCPUs = 2
+	assert.Equal(t, h.defaultVCPUs(), uint32(2), "default vCPU number is wrong")
+
+	// qemu supports max 255
+	h.DefaultVCPUs = 8086
+	assert.Equal(t, h.defaultVCPUs(), uint32(255), "default vCPU number is wrong")
+
+	h.DefaultMemSz = 1024
+	assert.Equal(t, h.defaultMemSz(), uint32(1024), "default memory size is wrong")
 }
 
 func TestProxyDefaults(t *testing.T) {