fix invalid memory limit

Signed-off-by: yeya24 <yb532204897@gmail.com>

daemon/config/config.go

@@ -134,6 +134,9 @@ type Config struct {
 
 	// EnableBuilder enable builder functionality
 	EnableBuilder bool `json:"enable-builder,omitempty"`
+
+	// MachineMemory is the memory limit for a host.
+	MachineMemory uint64 `json:"-"`
 }
 
 // GetCgroupDriver gets cgroup driver used in runc.

daemon/mgr/container_stats.go

@@ -38,6 +38,11 @@ func (mgr *ContainerManager) StreamStats(ctx context.Context, name string, confi
 	wrapContainerStats := func(metricMeta *containerdtypes.Metric, metric *cgroups.Metrics) (*types.ContainerStats, error) {
 		stats := toContainerStats(c, metricMeta, metric)
 
+		// if the container does not set memory limit, use the machineMemory
+		if stats.MemoryStats.Limit > mgr.Config.MachineMemory && mgr.Config.MachineMemory > 0 {
+			stats.MemoryStats.Limit = mgr.Config.MachineMemory
+		}
+
 		systemCPUUsage, err := getSystemCPUUsage()
 		if err != nil {
 			return nil, err

main.go

@@ -18,6 +18,7 @@ import (
 	"github.com/alibaba/pouch/lxcfs"
 	"github.com/alibaba/pouch/pkg/debug"
 	"github.com/alibaba/pouch/pkg/kernel"
+	"github.com/alibaba/pouch/pkg/system"
 	"github.com/alibaba/pouch/pkg/utils"
 	"github.com/alibaba/pouch/storage/quota"
 	"github.com/alibaba/pouch/version"
@@ -227,6 +228,10 @@ func runDaemon(cmd *cobra.Command) error {
 		return err
 	}
 
+	if cfg.MachineMemory, err = system.GetTotalMem(); err != nil {
+		logrus.Warnf("failed to get system mem: %v", err)
+	}
+
 	// initialize signal and handle method.
 	var (
 		errCh    = make(chan error, 1)