From 6f96a44df3457350f2d290fb811319bb888cc19c Mon Sep 17 00:00:00 2001
From: Amith Yamasani <yamasani@google.com>
Date: Tue, 9 Dec 2014 12:30:04 -0800
Subject: Stop guest user on exiting, to conserve resources

Bug: 18672730
Change-Id: I17bc26ce2e10ceebeb18b75565daf21aa7df7774
---
 .../android/server/am/ActivityManagerService.java  | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 1227148421af..e0f8aa6a676b 100755
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -18969,6 +18969,31 @@ public final class ActivityManagerService extends ActivityManagerNative
             }
             mUserSwitchObservers.finishBroadcast();
         }
+        stopGuestUserIfBackground();
+    }
+
+    /**
+     * Stops the guest user if it has gone to the background.
+     */
+    private void stopGuestUserIfBackground() {
+        synchronized (this) {
+            final int num = mUserLru.size();
+            for (int i = 0; i < num; i++) {
+                Integer oldUserId = mUserLru.get(i);
+                UserStartedState oldUss = mStartedUsers.get(oldUserId);
+                if (oldUserId == UserHandle.USER_OWNER || oldUserId == mCurrentUserId
+                        || oldUss.mState == UserStartedState.STATE_STOPPING
+                        || oldUss.mState == UserStartedState.STATE_SHUTDOWN) {
+                    continue;
+                }
+                UserInfo userInfo = mUserManager.getUserInfo(oldUserId);
+                if (userInfo.isGuest()) {
+                    // This is a user to be stopped.
+                    stopUserLocked(oldUserId, null);
+                    break;
+                }
+            }
+        }
     }
 
     void scheduleStartProfilesLocked() {
-- 
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