Kill background processes targeting SDK < N on density change (2aa46d43) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/am/ActivityManagerService.java

+33 −13

Original line number	Diff line number	Diff line
		@@ -5303,28 +5303,41 @@ public final class ActivityManagerService extends ActivityManagerNative

		@Override
		public void killAllBackgroundProcesses() {
		killAllBackgroundProcesses(-1);
		}

		/**
		* Kills all background processes with targetSdkVersion below the specified
		* target SDK version.
		*
		* @param targetSdkVersion the target SDK version below which to kill
		* processes, or {@code -1} to kill all processes
		*/
		private void killAllBackgroundProcesses(int targetSdkVersion) {
		if (checkCallingPermission(android.Manifest.permission.KILL_BACKGROUND_PROCESSES)
		!= PackageManager.PERMISSION_GRANTED) {
		String msg = "Permission Denial: killAllBackgroundProcesses() from pid="
		+ Binder.getCallingPid()
		+ ", uid=" + Binder.getCallingUid()
		final String msg = "Permission Denial: killAllBackgroundProcesses() from pid="
		+ Binder.getCallingPid() + ", uid=" + Binder.getCallingUid()
		+ " requires " + android.Manifest.permission.KILL_BACKGROUND_PROCESSES;
		Slog.w(TAG, msg);
		throw new SecurityException(msg);
		}

		long callingId = Binder.clearCallingIdentity();
		final long callingId = Binder.clearCallingIdentity();
		try {
		synchronized (this) {
		ArrayList<ProcessRecord> procs = new ArrayList<ProcessRecord>();
		final ArrayList<ProcessRecord> procs = new ArrayList<>();
		final int NP = mProcessNames.getMap().size();
		for (int ip = 0; ip < NP; ip++) {
		SparseArray<ProcessRecord> apps = mProcessNames.getMap().valueAt(ip);
		final SparseArray<ProcessRecord> apps = mProcessNames.getMap().valueAt(ip);
		final int NA = apps.size();
		for (int ia = 0; ia < NA; ia++) {
		ProcessRecord app = apps.valueAt(ia);
		final ProcessRecord app = apps.valueAt(ia);
		if (app.persistent) {
		// we don't kill persistent processes
		// We don't kill persistent processes.
		continue;
		}
		if (targetSdkVersion > 0 && app.info.targetSdkVersion < targetSdkVersion) {
		continue;
		}
		if (app.removed) {
		@@ -5336,11 +5349,13 @@ public final class ActivityManagerService extends ActivityManagerNative
		}
		}

		int N = procs.size();
		final int N = procs.size();
		for (int i = 0; i < N; i++) {
		removeProcessLocked(procs.get(i), false, true, "kill all background");
		}

		mAllowLowerMemLevel = true;

		updateOomAdjLocked();
		doLowMemReportIfNeededLocked(null);
		}
		@@ -17805,6 +17820,11 @@ public final class ActivityManagerService extends ActivityManagerNative
		mHandler.sendMessage(msg);
		}

		final boolean isDensityChange = (changes & ActivityInfo.CONFIG_DENSITY) != 0;
		if (isDensityChange) {
		killAllBackgroundProcesses(Build.VERSION_CODES.N);
		}

		for (int i=mLruProcesses.size()-1; i>=0; i--) {
		ProcessRecord app = mLruProcesses.get(i);
		try {