Consolidate freezer routines (a2eff98d) · Commits · e / os / android_frameworks_base

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

+19 −1

Original line number	Diff line number	Diff line
		@@ -1716,6 +1716,12 @@ public class ActivityManagerService extends IActivityManager.Stub
		*/
		@Nullable volatile ContentCaptureManagerInternal mContentCaptureService;

		/**
		* The interface to the freezer.
		*/
		@NonNull
		private final Freezer mFreezer;

		/*
		* The default duration for the binder heavy hitter auto sampler
		*/
		@@ -2506,6 +2512,7 @@ public class ActivityManagerService extends IActivityManager.Stub
		@Nullable UserController userController) {
		mInjector = injector;
		mContext = mInjector.getContext();
		mFreezer = injector.getFreezer();
		mUiContext = null;
		mAppErrors = injector.getAppErrors();
		mPackageWatchdog = null;
		@@ -2555,6 +2562,7 @@ public class ActivityManagerService extends IActivityManager.Stub
		LockGuard.installLock(this, LockGuard.INDEX_ACTIVITY);
		mInjector = new Injector(systemContext);
		mContext = systemContext;
		mFreezer = mInjector.getFreezer();

		mFactoryTest = FactoryTest.getMode();
		mSystemThread = ActivityThread.currentActivityThread();
		@@ -20919,6 +20927,11 @@ public class ActivityManagerService extends IActivityManager.Stub
		public IntentFirewall getIntentFirewall() {
		return null;
		}

		/** @return the default Freezer. */
		public Freezer getFreezer() {
		return new Freezer();
		}
		}

		@Override
		@@ -21022,7 +21035,7 @@ public class ActivityManagerService extends IActivityManager.Stub
		final long token = Binder.clearCallingIdentity();

		try {
		return CachedAppOptimizer.isFreezerSupported();
		return mFreezer.isFreezerSupported();
		} finally {
		Binder.restoreCallingIdentity(token);
		}
		@@ -21177,4 +21190,9 @@ public class ActivityManagerService extends IActivityManager.Stub
		void clearPendingTopAppLocked() {
		mPendingStartActivityUids.clear();
		}

		@NonNull
		Freezer getFreezer() {
		return mFreezer;
		}
		}

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

+29 −93

Original line number	Diff line number	Diff line
		@@ -664,6 +664,8 @@ public final class CachedAppOptimizer {
		private final ProcessDependencies mProcessDependencies;
		private final ProcLocksReader mProcLocksReader;

		private final Freezer mFreezer;

		public CachedAppOptimizer(ActivityManagerService am) {
		this(am, null, new DefaultProcessDependencies());
		}
		@@ -680,6 +682,7 @@ public final class CachedAppOptimizer {
		mTestCallback = callback;
		mSettingsObserver = new SettingsContentObserver();
		mProcLocksReader = new ProcLocksReader();
		mFreezer = mAm.getFreezer();
		}

		/**
		@@ -1049,89 +1052,6 @@ public final class CachedAppOptimizer {
		return true;
		}

		/**
		* Informs binder that a process is about to be frozen. If freezer is enabled on a process via
		* this method, this method will synchronously dispatch all pending transactions to the
		* specified pid. This method will not add significant latencies when unfreezing.
		* After freezing binder calls, binder will block all transaction to the frozen pid, and return
		* an error to the sending process.
		*
		* @param pid the target pid for which binder transactions are to be frozen
		* @param freeze specifies whether to flush transactions and then freeze (true) or unfreeze
		* binder for the specificed pid.
		* @param timeoutMs the timeout in milliseconds to wait for the binder interface to freeze
		* before giving up.
		*
		* @throws RuntimeException in case a flush/freeze operation could not complete successfully.
		* @return 0 if success, or -EAGAIN indicating there's pending transaction.
		*/
		public static native int freezeBinder(int pid, boolean freeze, int timeoutMs);

		/**
		* Retrieves binder freeze info about a process.
		* @param pid the pid for which binder freeze info is to be retrieved.
		*
		* @throws RuntimeException if the operation could not complete successfully.
		* @return a bit field reporting the binder freeze info for the process.
		*/
		private static native int getBinderFreezeInfo(int pid);

		/**
		* Returns the path to be checked to verify whether the freezer is supported by this system.
		* @return absolute path to the file
		*/
		private static native String getFreezerCheckPath();

		/**
		* Check if task_profiles.json includes valid freezer profiles and actions
		* @return false if there are invalid profiles or actions
		*/
		private static native boolean isFreezerProfileValid();

		/**
		* Determines whether the freezer is supported by this system
		*/
		public static boolean isFreezerSupported() {
		boolean supported = false;
		FileReader fr = null;

		try {
		String path = getFreezerCheckPath();
		Slog.d(TAG_AM, "Checking cgroup freezer: " + path);
		fr = new FileReader(path);
		char state = (char) fr.read();

		if (state == '1' \|\| state == '0') {
		// Also check freezer binder ioctl
		Slog.d(TAG_AM, "Checking binder freezer ioctl");
		getBinderFreezeInfo(Process.myPid());

		// Check if task_profiles.json contains invalid profiles
		Slog.d(TAG_AM, "Checking freezer profiles");
		supported = isFreezerProfileValid();
		} else {
		Slog.e(TAG_AM, "Unexpected value in cgroup.freeze");
		}
		} catch (java.io.FileNotFoundException e) {
		Slog.w(TAG_AM, "File cgroup.freeze not present");
		} catch (RuntimeException e) {
		Slog.w(TAG_AM, "Unable to read freezer info");
		} catch (Exception e) {
		Slog.w(TAG_AM, "Unable to read cgroup.freeze: " + e.toString());
		}

		if (fr != null) {
		try {
		fr.close();
		} catch (java.io.IOException e) {
		Slog.e(TAG_AM, "Exception closing cgroup.freeze: " + e.toString());
		}
		}

		Slog.d(TAG_AM, "Freezer supported: " + supported);
		return supported;
		}

		/**
		* Reads the flag value from DeviceConfig to determine whether app freezer
		* should be enabled, and starts the freeze/compaction thread if needed.
		@@ -1146,7 +1066,7 @@ public final class CachedAppOptimizer {
		} else if ("enabled".equals(configOverride)
		\|\| DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_ACTIVITY_MANAGER_NATIVE_BOOT,
		KEY_USE_FREEZER, DEFAULT_USE_FREEZER)) {
		mUseFreezer = isFreezerSupported();
		mUseFreezer = mFreezer.isFreezerSupported();
		updateFreezerDebounceTimeout();
		updateFreezerExemptInstPkg();
		} else {
		@@ -1528,7 +1448,7 @@ public final class CachedAppOptimizer {
		boolean processKilled = false;

		try {
		int freezeInfo = getBinderFreezeInfo(pid);
		int freezeInfo = mFreezer.getBinderFreezeInfo(pid);

		if ((freezeInfo & SYNC_RECEIVED_WHILE_FROZEN) != 0) {
		Slog.d(TAG_AM, "pid " + pid + " " + app.processName
		@@ -1562,7 +1482,7 @@ public final class CachedAppOptimizer {
		long freezeTime = opt.getFreezeUnfreezeTime();

		try {
		freezeBinder(pid, false, FREEZE_BINDER_TIMEOUT_MS);
		mFreezer.freezeBinder(pid, false, FREEZE_BINDER_TIMEOUT_MS);
		} catch (RuntimeException e) {
		Slog.e(TAG_AM, "Unable to unfreeze binder for " + pid + " " + app.processName
		+ ". Killing it");
		@@ -1574,7 +1494,7 @@ public final class CachedAppOptimizer {

		try {
		traceAppFreeze(app.processName, pid, reason);
		Process.setProcessFrozen(pid, app.uid, false);
		mFreezer.setProcessFrozen(pid, app.uid, false);

		opt.setFreezeUnfreezeTime(SystemClock.uptimeMillis());
		opt.setFrozen(false);
		@@ -1617,7 +1537,7 @@ public final class CachedAppOptimizer {
		}
		Slog.d(TAG_AM, "quick sync unfreeze " + pid + " for " + reason);
		try {
		freezeBinder(pid, false, FREEZE_BINDER_TIMEOUT_MS);
		mFreezer.freezeBinder(pid, false, FREEZE_BINDER_TIMEOUT_MS);
		} catch (RuntimeException e) {
		Slog.e(TAG_AM, "Unable to quick unfreeze binder for " + pid);
		return;
		@@ -1625,7 +1545,7 @@ public final class CachedAppOptimizer {

		try {
		traceAppFreeze(app.processName, pid, reason);
		Process.setProcessFrozen(pid, app.uid, false);
		mFreezer.setProcessFrozen(pid, app.uid, false);
		} catch (Exception e) {
		Slog.e(TAG_AM, "Unable to quick unfreeze " + pid);
		}
		@@ -2394,7 +2314,7 @@ public final class CachedAppOptimizer {
		// Freeze binder interface before the process, to flush any
		// transactions that might be pending.
		try {
		if (freezeBinder(pid, true, FREEZE_BINDER_TIMEOUT_MS) != 0) {
		if (mFreezer.freezeBinder(pid, true, FREEZE_BINDER_TIMEOUT_MS) != 0) {
		handleBinderFreezerFailure(proc, "outstanding txns");
		return;
		}
		@@ -2413,7 +2333,7 @@ public final class CachedAppOptimizer {

		try {
		traceAppFreeze(proc.processName, pid, -1);
		Process.setProcessFrozen(pid, proc.uid, true);
		mFreezer.setProcessFrozen(pid, proc.uid, true);
		opt.setFreezeUnfreezeTime(SystemClock.uptimeMillis());
		opt.setFrozen(true);
		opt.setHasCollectedFrozenPSS(false);
		@@ -2452,7 +2372,7 @@ public final class CachedAppOptimizer {

		try {
		// post-check to prevent races
		int freezeInfo = getBinderFreezeInfo(pid);
		int freezeInfo = mFreezer.getBinderFreezeInfo(pid);

		if ((freezeInfo & TXNS_PENDING_WHILE_FROZEN) != 0) {
		synchronized (mProcLock) {
		@@ -2619,6 +2539,22 @@ public final class CachedAppOptimizer {
		});
		}

		/**
		* Freeze or unfreeze a process. This should only be used for testing.
		*/
		@VisibleForTesting
		void forceFreezeForTest(ProcessRecord proc, boolean freeze) {
		synchronized (mAm) {
		synchronized (mProcLock) {
		if (freeze) {
		forceFreezeAppAsyncLSP(proc);
		} else {
		unfreezeAppInternalLSP(proc, UNFREEZE_REASON_NONE, true);
		}
		}
		}
		}

		/**
		* Sending binder transactions to frozen apps most likely indicates there's a bug. Log it and
		* kill the frozen apps if they 1) receive sync binder transactions while frozen, or 2) miss
		@@ -2660,7 +2596,7 @@ public final class CachedAppOptimizer {
		for (int i = 0; i < pids.size(); i++) {
		int current = pids.get(i);
		try {
		int freezeInfo = getBinderFreezeInfo(current);
		int freezeInfo = mFreezer.getBinderFreezeInfo(current);

		if ((freezeInfo & SYNC_RECEIVED_WHILE_FROZEN) != 0) {
		killProcess(current, "Sync transaction while frozen",

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

0 → 100644

+115 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2024 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.server.am;

		import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;

		import android.os.Process;

		/**
		* A collection of interfaces to manage the freezer. All access to the freezer goes through an
		* instance of this class. The class can be overridden for testing.
		*
		* Methods may be called without external synchronization. Multiple instances of this class can be
		* used concurrently.
		*/
		class Freezer {

		/**
		* Freeze or unfreeze the specified process.
		*
		* @param pid Identifier of the process to freeze or unfreeze.
		* @param uid Identifier of the user the process is running under.
		* @param frozen Specify whether to free (true) or unfreeze (false).
		*/
		public void setProcessFrozen(int pid, int uid, boolean frozen) {
		Process.setProcessFrozen(pid, uid, frozen);
		}

		/**
		* Informs binder that a process is about to be frozen. If freezer is enabled on a process via
		* this method, this method will synchronously dispatch all pending transactions to the
		* specified pid. This method will not add significant latencies when unfreezing.
		* After freezing binder calls, binder will block all transaction to the frozen pid, and return
		* an error to the sending process.
		*
		* @param pid the target pid for which binder transactions are to be frozen
		* @param freeze specifies whether to flush transactions and then freeze (true) or unfreeze
		* binder for the specified pid.
		* @param timeoutMs the timeout in milliseconds to wait for the binder interface to freeze
		* before giving up.
		*
		* @throws RuntimeException in case a flush/freeze operation could not complete successfully.
		* @return 0 if success, or -EAGAIN indicating there's pending transaction.
		*/
		public int freezeBinder(int pid, boolean freeze, int timeoutMs) {
		return nativeFreezeBinder(pid, freeze, timeoutMs);
		}

		/**
		* Retrieves binder freeze info about a process.
		* @param pid the pid for which binder freeze info is to be retrieved.
		*
		* @throws RuntimeException if the operation could not complete successfully.
		* @return a bit field reporting the binder freeze info for the process.
		*/
		public int getBinderFreezeInfo(int pid) {
		return nativeGetBinderFreezeInfo(pid);
		}

		/**
		* Determines whether the freezer is supported by this system.
		* @return true if the freezer is supported.
		*/
		public boolean isFreezerSupported() {
		return nativeIsFreezerSupported();
		}

		// Native methods

		/**
		* Informs binder that a process is about to be frozen. If freezer is enabled on a process via
		* this method, this method will synchronously dispatch all pending transactions to the
		* specified pid. This method will not add significant latencies when unfreezing.
		* After freezing binder calls, binder will block all transaction to the frozen pid, and return
		* an error to the sending process.
		*
		* @param pid the target pid for which binder transactions are to be frozen
		* @param freeze specifies whether to flush transactions and then freeze (true) or unfreeze
		* binder for the specified pid.
		* @param timeoutMs the timeout in milliseconds to wait for the binder interface to freeze
		* before giving up.
		*
		* @throws RuntimeException in case a flush/freeze operation could not complete successfully.
		* @return 0 if success, or -EAGAIN indicating there's pending transaction.
		*/
		private static native int nativeFreezeBinder(int pid, boolean freeze, int timeoutMs);

		/**
		* Retrieves binder freeze info about a process.
		* @param pid the pid for which binder freeze info is to be retrieved.
		*
		* @throws RuntimeException if the operation could not complete successfully.
		* @return a bit field reporting the binder freeze info for the process.
		*/
		private static native int nativeGetBinderFreezeInfo(int pid);

		/**
		* Return 0 if the freezer is supported on this platform and -1 otherwise.
		*/
		private static native boolean nativeIsFreezerSupported();
		}

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

+2 −2

Original line number	Diff line number	Diff line
		@@ -3005,7 +3005,7 @@ public final class ProcessList {
		return freezePackageCgroup(packageUID, false);
		}

		private static void freezeBinderAndPackageCgroup(List<Pair<ProcessRecord, Boolean>> procs,
		private void freezeBinderAndPackageCgroup(List<Pair<ProcessRecord, Boolean>> procs,
		int packageUID) {
		// Freeze all binder processes under the target UID (whose cgroup is about to be frozen).
		// Since we're going to kill these, we don't need to unfreze them later.
		@@ -3019,7 +3019,7 @@ public final class ProcessList {
		try {
		int rc;
		do {
		rc = CachedAppOptimizer.freezeBinder(pid, true, 10 /* timeout_ms */);
		rc = mService.getFreezer().freezeBinder(pid, true, 10 /* timeout_ms */);
		} while (rc == -EAGAIN && nRetries++ < 1);
		if (rc != 0) Slog.e(TAG, "Unable to freeze binder for " + pid + ": " + rc);
		} catch (RuntimeException e) {

services/core/jni/Android.bp

+8 −0

Original line number	Diff line number	Diff line
		@@ -79,6 +79,7 @@ cc_library_static {
		"com_android_server_wm_TaskFpsCallbackController.cpp",
		"onload.cpp",
		":lib_cachedAppOptimizer_native",
		":lib_freezer_native",
		":lib_gameManagerService_native",
		":lib_oomConnection_native",
		":lib_anrTimer_native",
		@@ -240,6 +241,13 @@ filegroup {
		],
		}

		filegroup {
		name: "lib_freezer_native",
		srcs: [
		"com_android_server_am_Freezer.cpp",
		],
		}

		filegroup {
		name: "lib_gameManagerService_native",
		srcs: [