diff --git a/service/oomkiller/service.go b/service/oomkiller/service.go
index 01e078b8..d2bef722 100644
--- a/service/oomkiller/service.go
+++ b/service/oomkiller/service.go
@@ -52,21 +52,6 @@ func NewService(ctx context.Context, logger log.ContextLogger, tag string, optio
 	}, nil
 }
 
-func (s *Service) createTimer() {
-	s.adaptiveTimer = newAdaptiveTimer(s.logger, s.network, s.timerConfig, s.writeOOMReport)
-}
-
-func (s *Service) startTimer() {
-	s.createTimer()
-	s.adaptiveTimer.start()
-}
-
-func (s *Service) stopTimer() {
-	if s.adaptiveTimer != nil {
-		s.adaptiveTimer.stop()
-	}
-}
-
 func (s *Service) writeOOMReport(memoryUsage uint64) {
 	now := time.Now().Unix()
 	lastReport := s.lastReportTime.Load()
diff --git a/service/oomkiller/service_darwin.go b/service/oomkiller/service_darwin.go
index 0efdb7ab..166ddc7d 100644
--- a/service/oomkiller/service_darwin.go
+++ b/service/oomkiller/service_darwin.go
@@ -54,7 +54,7 @@ func (s *Service) Start(stage adapter.StartStage) error {
 		return nil
 	}
 	if s.timerConfig.policyMode == policyModeNetworkExtension {
-		s.createTimer()
+		s.adaptiveTimer = newAdaptiveTimer(s.logger, s.network, s.timerConfig, nil)
 		globalAccess.Lock()
 		isFirst := len(globalServices) == 0
 		globalServices = append(globalServices, s)
@@ -67,12 +67,15 @@ func (s *Service) Start(stage adapter.StartStage) error {
 	if !s.timerConfig.policyMode.hasTimerMode() {
 		return E.New("memory pressure monitoring is not available on this platform without memory_limit")
 	}
-	s.startTimer()
+	s.adaptiveTimer = newAdaptiveTimer(s.logger, s.network, s.timerConfig, s.writeOOMReport)
+	s.adaptiveTimer.start()
 	return nil
 }
 
 func (s *Service) Close() error {
-	s.stopTimer()
+	if s.adaptiveTimer != nil {
+		s.adaptiveTimer.stop()
+	}
 	if s.timerConfig.policyMode == policyModeNetworkExtension {
 		globalAccess.Lock()
 		for i, svc := range globalServices {
diff --git a/service/oomkiller/service_stub.go b/service/oomkiller/service_stub.go
index 5eaf8204..81ebbf03 100644
--- a/service/oomkiller/service_stub.go
+++ b/service/oomkiller/service_stub.go
@@ -14,11 +14,14 @@ func (s *Service) Start(stage adapter.StartStage) error {
 	if !s.timerConfig.policyMode.hasTimerMode() {
 		return E.New("memory pressure monitoring is not available on this platform without memory_limit")
 	}
-	s.startTimer()
+	s.adaptiveTimer = newAdaptiveTimer(s.logger, s.network, s.timerConfig, s.writeOOMReport)
+	s.adaptiveTimer.start()
 	return nil
 }
 
 func (s *Service) Close() error {
-	s.stopTimer()
+	if s.adaptiveTimer != nil {
+		s.adaptiveTimer.stop()
+	}
 	return nil
 }
diff --git a/service/oomkiller/timer.go b/service/oomkiller/timer.go
index 6e9db4c1..f8ab1475 100644
--- a/service/oomkiller/timer.go
+++ b/service/oomkiller/timer.go
@@ -105,7 +105,6 @@ type adaptiveTimer struct {
 	limitThresholds pressureThresholds
 
 	access                  sync.Mutex
-	cleanupTriggered        bool
 	timer                   *time.Timer
 	state                   pressureState
 	currentInterval         time.Duration
@@ -162,12 +161,6 @@ func (t *adaptiveTimer) poll() {
 		t.access.Unlock()
 		return
 	}
-	if t.timerConfig.policyMode == policyModeNetworkExtension {
-		if t.cleanupTriggered {
-			runtimeDebug.FreeOSMemory()
-			t.cleanupTriggered = true
-		}
-	}
 	if t.pendingPressureBaseline {
 		t.pressureBaseline = sample
 		t.pressureBaselineTime = time.Now()
@@ -190,8 +183,8 @@ func (t *adaptiveTimer) poll() {
 			growth := sample.usage - t.pressureBaseline.usage
 			ratePerSecond := float64(growth) / elapsed.Seconds()
 			headroom := t.memoryLimit - sample.usage
-			timeToLimit := time.Duration(float64(headroom)/ratePerSecond) * time.Second
-			if timeToLimit < t.minInterval {
+			secondsUntilLimit := float64(headroom) / ratePerSecond
+			if secondsUntilLimit < t.minInterval.Seconds() {
 				triggered = true
 				rateTriggered = true
 				t.state = pressureStateTriggered
@@ -202,8 +195,9 @@ func (t *adaptiveTimer) poll() {
 	if !triggered {
 		return
 	}
-	t.cleanupTriggered = false
-	t.onTriggered(sample.usage)
+	if t.onTriggered != nil {
+		t.onTriggered(sample.usage)
+	}
 	if rateTriggered {
 		if t.killerDisabled {
 			t.logger.Warn("memory growth rate critical (report only), usage: ", byteformats.FormatMemoryBytes(sample.usage), t.logDetails(sample))
diff --git a/service/oomkiller/timer_darwin.go b/service/oomkiller/timer_darwin.go
index 6c4f7efa..f73ab28f 100644
--- a/service/oomkiller/timer_darwin.go
+++ b/service/oomkiller/timer_darwin.go
@@ -2,7 +2,10 @@
 
 package oomkiller
 
+import runtimeDebug "runtime/debug"
+
 func (t *adaptiveTimer) notifyPressure() {
+	runtimeDebug.FreeOSMemory()
 	t.access.Lock()
 	t.startLocked()
 	t.forceMinInterval = true