Add support for memory reservation

Signed-off-by: qhuang <qhuang@10.0.2.15>

sysinfo/sysinfo.go

@@ -31,6 +31,9 @@ type cgroupMemInfo struct {
 	// Whether swap limit is supported or not
 	SwapLimit bool
 
+	// Whether soft limit is supported or not
+	MemoryReservation bool
+
 	// Whether OOM killer disalbe is supported or not
 	OomKillDisable bool
 

sysinfo/sysinfo_linux.go

@@ -49,6 +49,10 @@ func checkCgroupMem(quiet bool) cgroupMemInfo {
 	if !quiet && !swapLimit {
 		logrus.Warn("Your kernel does not support swap memory limit.")
 	}
+	memoryReservation := cgroupEnabled(mountPoint, "memory.soft_limit_in_bytes")
+	if !quiet && !memoryReservation {
+		logrus.Warn("Your kernel does not support memory reservation.")
+	}
 	oomKillDisable := cgroupEnabled(mountPoint, "memory.oom_control")
 	if !quiet && !oomKillDisable {
 		logrus.Warnf("Your kernel does not support oom control.")
@@ -65,6 +69,7 @@ func checkCgroupMem(quiet bool) cgroupMemInfo {
 	return cgroupMemInfo{
 		MemoryLimit:       true,
 		SwapLimit:         swapLimit,
+		MemoryReservation: memoryReservation,
 		OomKillDisable:    oomKillDisable,
 		MemorySwappiness:  memorySwappiness,
 		KernelMemory:      kernelMemory,