Set kernel.applicationCores to the number of processor on the host

The right number to use is the number of processors assigned to the cgroup. But until
we make the sandbox join the respective cgroup, just use the number of processors on
the host.

Closes #65, closes #66

PiperOrigin-RevId: 200725483
Change-Id: I34a566b1a872e26c66f56fa6e3100f42aaf802b1

2 files changed, 10 insertions, 5 deletions

diff --git a/runsc/boot/loader.go b/runsc/boot/loader.go
index 4a6528307..89300a953 100644
--- a/runsc/boot/loader.go
+++ b/runsc/boot/loader.go
@@ -18,6 +18,7 @@ package boot
 import (
 	"fmt"
 	"math/rand"
+	"runtime"
 	"sync/atomic"
 	"syscall"
 	gtime "time"
@@ -171,10 +172,11 @@ func New(spec *specs.Spec, conf *Config, controllerFD int, ioFDs []int, console
 		Timekeeper:        tk,
 		RootUserNamespace: creds.UserNamespace,
 		NetworkStack:      networkStack,
-		ApplicationCores:  8,
-		Vdso:              vdso,
-		RootUTSNamespace:  utsns,
-		RootIPCNamespace:  ipcns,
+		// TODO: use number of logical processors from cgroups.
+		ApplicationCores: uint(runtime.NumCPU()),
+		Vdso:             vdso,
+		RootUTSNamespace: utsns,
+		RootIPCNamespace: ipcns,
 	}); err != nil {
 		return nil, fmt.Errorf("error initializing kernel: %v", err)
 	}
diff --git a/runsc/boot/loader_test.go b/runsc/boot/loader_test.go
index 3ce7855f6..ca78c2cd6 100644
--- a/runsc/boot/loader_test.go
+++ b/runsc/boot/loader_test.go
@@ -15,7 +15,9 @@
 package boot
 
 import (
+	"fmt"
 	"io/ioutil"
+	"math/rand"
 	"os"
 	"sync"
 	"testing"
@@ -29,6 +31,7 @@ import (
 
 func init() {
 	log.SetLevel(log.Debug)
+	rand.Seed(time.Now().UnixNano())
 }
 
 // testSpec returns a simple spec that can be used in tests.
@@ -46,7 +49,7 @@ func testSpec() *specs.Spec {
 }
 
 func createLoader() (*Loader, error) {
-	fd, err := server.CreateSocket(ControlSocketAddr("123"))
+	fd, err := server.CreateSocket(ControlSocketAddr(fmt.Sprintf("%010d", rand.Int())[:10]))
 	if err != nil {
 		return nil, err
 	}