diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index eb7d5c3..3856d27 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -5061,6 +5061,10 @@
             // Tell anyone interested that we are done booting!
             SystemProperties.set("sys.boot_completed", "1");
             SystemProperties.set("dev.bootcomplete", "1");
+
+            // Start PSI monitoring in LMKD if it was skipped earlier.
+            ProcessList.startPsiMonitoringAfterBoot();
+
             mUserController.onBootComplete(
                     new IIntentReceiver.Stub() {
                         @Override
diff --git a/services/core/java/com/android/server/am/ProcessList.java b/services/core/java/com/android/server/am/ProcessList.java
index acd9771..e484a6c 100644
--- a/services/core/java/com/android/server/am/ProcessList.java
+++ b/services/core/java/com/android/server/am/ProcessList.java
@@ -357,6 +357,7 @@
     static final byte LMK_UPDATE_PROPS = 7;
     static final byte LMK_KILL_OCCURRED = 8; // Msg to subscribed clients on kill occurred event
     static final byte LMK_STATE_CHANGED = 9; // Msg to subscribed clients on state changed
+    static final byte LMK_START_MONITORING = 9; // Start monitoring if delayed earlier
 
     // Low Memory Killer Daemon command codes.
     // These must be kept in sync with async_event_type definitions in lmkd.h
@@ -1568,6 +1569,15 @@
         return true;
     }
 
+    /**
+     * {@hide}
+     */
+    public static void startPsiMonitoringAfterBoot() {
+        ByteBuffer buf = ByteBuffer.allocate(4);
+        buf.putInt(LMK_START_MONITORING);
+        writeLmkd(buf, null);
+    }
+
     private static boolean writeLmkd(ByteBuffer buf, ByteBuffer repl) {
         if (!sLmkdConnection.isConnected()) {
             // try to connect immediately and then keep retrying