Throttle requests to ActivityManager.getProcessMemoryInfo().
This is very expensive and needs to run in the system process, we
don't want apps abusing it.
Also don't allow apps to get information about anything but their
own process, unless they have the appropriate privileged permissions.
Bug: 112537519
Test: manual
Change-Id: I01997d6f888341e8eb2afe6a69545dd5be013744
diff --git a/services/core/java/com/android/server/am/ProcessRecord.java b/services/core/java/com/android/server/am/ProcessRecord.java
index 8c552b9..144f18b 100644
--- a/services/core/java/com/android/server/am/ProcessRecord.java
+++ b/services/core/java/com/android/server/am/ProcessRecord.java
@@ -20,6 +20,7 @@
import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
+import android.os.Debug;
import android.util.ArraySet;
import android.util.DebugUtils;
import android.util.EventLog;
@@ -207,6 +208,11 @@
Object adjTarget; // Debugging: target component impacting oom_adj.
Runnable crashHandler; // Optional local handler to be invoked in the process crash.
+ // Cache of last retrieve memory info and uptime, to throttle how frequently
+ // apps can requyest it.
+ Debug.MemoryInfo lastMemInfo;
+ long lastMemInfoTime;
+
// Controller for driving the process state on the window manager side.
final private WindowProcessController mWindowProcessController;
// all ServiceRecord running in this process