diff --git a/services/java/com/android/server/EventLogTags.logtags b/services/java/com/android/server/EventLogTags.logtags
index 41f7335f9bc81..dd50bebff50c2 100644
--- a/services/java/com/android/server/EventLogTags.logtags
+++ b/services/java/com/android/server/EventLogTags.logtags
@@ -114,6 +114,8 @@ option java_package com.android.server
 # Package Manager ready:
 3100 boot_progress_pms_ready (time|2|3)
 # + check activity_launch_time for Home app
+# Value of "unknown sources" setting at app install time
+3110 unknown_sources_enabled (value|1)
 
 
 # ---------------------------
diff --git a/services/java/com/android/server/pm/PackageManagerService.java b/services/java/com/android/server/pm/PackageManagerService.java
index d41cd5a353f47..430408a066f7a 100644
--- a/services/java/com/android/server/pm/PackageManagerService.java
+++ b/services/java/com/android/server/pm/PackageManagerService.java
@@ -688,6 +688,10 @@ public class PackageManagerService extends IPackageManager.Stub {
                                 // Remove the replaced package's older resources safely now
                                 deleteOld = true;
                             }
+
+                            // Log current value of "unknown sources" setting
+                            EventLog.writeEvent(EventLogTags.UNKNOWN_SOURCES_ENABLED,
+                                getUnknownSourcesSettings());
                         }
                         // Force a gc to clear up things
                         Runtime.getRuntime().gc();
@@ -5407,6 +5411,17 @@ public class PackageManagerService extends IPackageManager.Stub {
                 DEFAULT_VERIFY_ENABLE ? 1 : 0) == 1 ? true : false;
     }
 
+    /**
+     * Get the "allow unknown sources" setting.
+     *
+     * @return the current "allow unknown sources" setting
+     */
+    private int getUnknownSourcesSettings() {
+        return android.provider.Settings.Secure.getInt(mContext.getContentResolver(),
+                android.provider.Settings.Secure.INSTALL_NON_MARKET_APPS,
+                -1);
+    }
+
     public void setInstallerPackageName(String targetPackage, String installerPackageName) {
         final int uid = Binder.getCallingUid();
         // writer