all: support swap feature on Linux

If the feature is supported on the device, allocate a 128MB swap file
after VM boot and activate it.

1 files changed, 12 insertions, 0 deletions

diff --git a/pkg/host/features_linux.go b/pkg/host/features_linux.go
index 142e58e3b..408e219eb 100644
--- a/pkg/host/features_linux.go
+++ b/pkg/host/features_linux.go
@@ -5,6 +5,7 @@ package host
 
 import (
 	"fmt"
+	"os/exec"
 	"regexp"
 	"runtime"
 	"runtime/debug"
@@ -37,6 +38,7 @@ func init() {
 	checkFeature[FeatureVhciInjection] = checkVhciInjection
 	checkFeature[FeatureWifiEmulation] = checkWifiEmulation
 	checkFeature[Feature802154Emulation] = check802154Emulation
+	checkFeature[FeatureSwap] = checkSwap
 }
 
 func checkCoverage() string {
@@ -287,6 +289,16 @@ func check802154Emulation() string {
 	return ""
 }
 
+func checkSwap() string {
+	if err := osutil.IsAccessible("/proc/swaps"); err != nil {
+		return err.Error()
+	}
+	if _, err := exec.LookPath("mkswap"); err != nil {
+		return "mkswap is not available"
+	}
+	return ""
+}
+
 func requireKernel(x, y int) string {
 	info := new(unix.Utsname)
 	if err := unix.Uname(info); err != nil {