Merge "Add a rate limiter to the getRunningAppProcesses() call" into main (ba66019b) · Commits · e / os / android_frameworks_base

core/java/android/app/ActivityManager.java

+15 −0

Original line number	Diff line number	Diff line
		@@ -94,6 +94,7 @@ import com.android.internal.os.TransferPipe;
		import com.android.internal.util.FastPrintWriter;
		import com.android.internal.util.MemInfoReader;
		import com.android.internal.util.Preconditions;
		import com.android.internal.util.RateLimitingCache;
		import com.android.modules.utils.TypedXmlPullParser;
		import com.android.modules.utils.TypedXmlSerializer;
		import com.android.server.LocalServices;
		@@ -228,6 +229,10 @@ public class ActivityManager {

		final ArrayMap<OnUidImportanceListener, MyUidObserver> mImportanceListeners = new ArrayMap<>();

		/** Rate-Limiting Cache that allows no more than 400 calls to the service per second. */
		private static final RateLimitingCache<List<RunningAppProcessInfo>> mRunningProcessesCache =
		new RateLimitingCache<>(10, 4);

		/**
		* Map of callbacks that have registered for {@link UidFrozenStateChanged} events.
		* Will be called when a Uid has become frozen or unfrozen.
		@@ -4213,6 +4218,16 @@ public class ActivityManager {
		* specified.
		*/
		public List<RunningAppProcessInfo> getRunningAppProcesses() {
		if (!Flags.rateLimitGetRunningAppProcesses()) {
		return getRunningAppProcessesInternal();
		} else {
		return mRunningProcessesCache.get(() -> {
		return getRunningAppProcessesInternal();
		});
		}
		}

		private List<RunningAppProcessInfo> getRunningAppProcessesInternal() {
		try {
		return getService().getRunningAppProcesses();
		} catch (RemoteException e) {

+12 −0

Original line number	Diff line number	Diff line
		@@ -81,3 +81,15 @@ flag {
		purpose: PURPOSE_BUGFIX
		}
		}

		flag {
		namespace: "backstage_power"
		name: "rate_limit_get_running_app_processes"
		description: "Rate limit calls to getRunningAppProcesses using a cache"
		is_fixed_read_only: true
		bug: "360374604"
		metadata {
		purpose: PURPOSE_BUGFIX
		}
		}