support in operator

Signed-off-by: dongjiang <[email protected]>

operator/cmd/operator/app/operator.go

@@ -39,6 +39,7 @@ import (
 	ctrlctx "github.com/karmada-io/karmada/operator/pkg/controller/context"
 	"github.com/karmada-io/karmada/operator/pkg/controller/karmada"
 	"github.com/karmada-io/karmada/operator/pkg/scheme"
+	"github.com/karmada-io/karmada/pkg/goruntime"
 	"github.com/karmada-io/karmada/pkg/sharedcli"
 	"github.com/karmada-io/karmada/pkg/sharedcli/klogflag"
 	"github.com/karmada-io/karmada/pkg/version"
@@ -99,6 +100,8 @@ func Run(ctx context.Context, o *options.Options) error {
 	klog.Infof("karmada-operator version: %s", version.Get())
 	klog.InfoS("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))
 
+	goruntime.SetMemLimit(o.MemlimitRatio)
+
 	manager, err := createControllerManager(ctx, o)
 	if err != nil {
 		klog.Errorf("Failed to build controller manager: %v", err)

operator/cmd/operator/app/options/options.go

@@ -57,6 +57,10 @@ type Options struct {
 	HealthProbeBindAddress string
 	// ConcurrentKarmadaSyncs is the number of karmada objects that are allowed to sync concurrently.
 	ConcurrentKarmadaSyncs int
+
+	// The ratio of reserved GOMEMLIMIT memory to the detected maximum container or system memory.
+	// Defaults to 0.9.
+	MemlimitRatio float64
 }
 
 // NewOptions creates a new Options with a default config.
@@ -75,6 +79,7 @@ func NewOptions() *Options {
 		KubeAPIQPS:             50,
 		KubeAPIBurst:           100,
 		ConcurrentKarmadaSyncs: 5,
+		MemlimitRatio:          0.9,
 	}
 	return &o
 }
@@ -91,6 +96,8 @@ func (o *Options) AddFlags(fs *pflag.FlagSet, allControllers []string, disabledB
 		"named 'foo', '-foo' disables the controller named 'foo'.\nAll controllers: %s .\nDisabled-by-default controllers: %s .",
 		strings.Join(allControllers, ", "), strings.Join(disabledByDefaultControllers, ", ")))
 	fs.IntVar(&o.ConcurrentKarmadaSyncs, "concurrent-karmada-syncs", o.ConcurrentKarmadaSyncs, "The number of karmada objects that are allowed to sync concurrently.")
+	fs.Float64Var(&o.MemlimitRatio, "auto-gomemlimit-ratio", 0.9, "The ratio of reserved GOMEMLIMIT memory to the detected maximum container or system memory. The value must be greater than 0 and less than or equal to 1.")
+
 	options.BindLeaderElectionFlags(&o.LeaderElection, fs)
 }