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OomAdjuster.java
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OomAdjuster.java
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/*
* Copyright (C) 2019 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 android.app.ActivityManager.PROCESS_CAPABILITY_ALL;
import static android.app.ActivityManager.PROCESS_CAPABILITY_ALL_IMPLICIT;
import static android.app.ActivityManager.PROCESS_CAPABILITY_FOREGROUND_CAMERA;
import static android.app.ActivityManager.PROCESS_CAPABILITY_FOREGROUND_LOCATION;
import static android.app.ActivityManager.PROCESS_CAPABILITY_FOREGROUND_MICROPHONE;
import static android.app.ActivityManager.PROCESS_CAPABILITY_NETWORK;
import static android.app.ActivityManager.PROCESS_CAPABILITY_NONE;
import static android.app.ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
import static android.app.ActivityManager.PROCESS_STATE_BOUND_TOP;
import static android.app.ActivityManager.PROCESS_STATE_CACHED_ACTIVITY;
import static android.app.ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT;
import static android.app.ActivityManager.PROCESS_STATE_CACHED_EMPTY;
import static android.app.ActivityManager.PROCESS_STATE_CACHED_RECENT;
import static android.app.ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE;
import static android.app.ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND;
import static android.app.ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND;
import static android.app.ActivityManager.PROCESS_STATE_LAST_ACTIVITY;
import static android.app.ActivityManager.PROCESS_STATE_NONEXISTENT;
import static android.app.ActivityManager.PROCESS_STATE_PERSISTENT;
import static android.app.ActivityManager.PROCESS_STATE_PERSISTENT_UI;
import static android.app.ActivityManager.PROCESS_STATE_SERVICE;
import static android.app.ActivityManager.PROCESS_STATE_TOP;
import static android.app.ActivityManager.PROCESS_STATE_TRANSIENT_BACKGROUND;
import static android.content.Context.BIND_TREAT_LIKE_VISIBLE_FOREGROUND_SERVICE;
import static android.content.pm.ServiceInfo.FOREGROUND_SERVICE_TYPE_CAMERA;
import static android.content.pm.ServiceInfo.FOREGROUND_SERVICE_TYPE_LOCATION;
import static android.content.pm.ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE;
import static android.os.Process.SCHED_OTHER;
import static android.os.Process.THREAD_GROUP_BACKGROUND;
import static android.os.Process.THREAD_GROUP_DEFAULT;
import static android.os.Process.THREAD_GROUP_RESTRICTED;
import static android.os.Process.THREAD_GROUP_TOP_APP;
import static android.os.Process.THREAD_PRIORITY_DISPLAY;
import static android.os.Process.THREAD_PRIORITY_TOP_APP_BOOST;
import static android.os.Process.setProcessGroup;
import static android.os.Process.setThreadPriority;
import static android.os.Process.setThreadScheduler;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ALL;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_BACKUP;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_LRU;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_OOM_ADJ;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_OOM_ADJ_REASON;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_PROCESS_OBSERVERS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_PSS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_UID_OBSERVERS;
import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_USAGE_STATS;
import static com.android.server.am.ActivityManagerService.DISPATCH_OOM_ADJ_OBSERVER_MSG;
import static com.android.server.am.ActivityManagerService.IDLE_UIDS_MSG;
import static com.android.server.am.ActivityManagerService.TAG_BACKUP;
import static com.android.server.am.ActivityManagerService.TAG_LRU;
import static com.android.server.am.ActivityManagerService.TAG_OOM_ADJ;
import static com.android.server.am.ActivityManagerService.TAG_UID_OBSERVERS;
import static com.android.server.am.AppProfiler.TAG_PSS;
import static com.android.server.am.PlatformCompatCache.CACHED_COMPAT_CHANGE_CAMERA_MICROPHONE_CAPABILITY;
import static com.android.server.am.PlatformCompatCache.CACHED_COMPAT_CHANGE_PROCESS_CAPABILITY;
import static com.android.server.am.PlatformCompatCache.CACHED_COMPAT_CHANGE_USE_SHORT_FGS_USAGE_INTERACTION_TIME;
import static com.android.server.am.ProcessList.TAG_PROCESS_OBSERVERS;
import static com.android.server.wm.ActivityTaskManagerDebugConfig.DEBUG_SWITCH;
import android.annotation.Nullable;
import android.app.ActivityManager;
import android.app.ActivityThread;
import android.app.ApplicationExitInfo;
import android.app.usage.UsageEvents;
import android.compat.annotation.ChangeId;
import android.compat.annotation.EnabledAfter;
import android.compat.annotation.EnabledSince;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ApplicationInfo;
import android.content.pm.ServiceInfo;
import android.os.Handler;
import android.os.IBinder;
import android.os.PowerManagerInternal;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.Trace;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.Slog;
import android.util.proto.ProtoOutputStream;
import com.android.internal.annotations.CompositeRWLock;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.LocalServices;
import com.android.server.ServiceThread;
import com.android.server.am.PlatformCompatCache.CachedCompatChangeId;
import com.android.server.wm.ActivityServiceConnectionsHolder;
import com.android.server.wm.WindowProcessController;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
/**
* All of the code required to compute proc states and oom_adj values.
*/
public class OomAdjuster {
static final String TAG = "OomAdjuster";
static final String OOM_ADJ_REASON_METHOD = "updateOomAdj";
static final String OOM_ADJ_REASON_NONE = OOM_ADJ_REASON_METHOD + "_meh";
static final String OOM_ADJ_REASON_ACTIVITY = OOM_ADJ_REASON_METHOD + "_activityChange";
static final String OOM_ADJ_REASON_FINISH_RECEIVER = OOM_ADJ_REASON_METHOD + "_finishReceiver";
static final String OOM_ADJ_REASON_START_RECEIVER = OOM_ADJ_REASON_METHOD + "_startReceiver";
static final String OOM_ADJ_REASON_BIND_SERVICE = OOM_ADJ_REASON_METHOD + "_bindService";
static final String OOM_ADJ_REASON_UNBIND_SERVICE = OOM_ADJ_REASON_METHOD + "_unbindService";
static final String OOM_ADJ_REASON_START_SERVICE = OOM_ADJ_REASON_METHOD + "_startService";
static final String OOM_ADJ_REASON_GET_PROVIDER = OOM_ADJ_REASON_METHOD + "_getProvider";
static final String OOM_ADJ_REASON_REMOVE_PROVIDER = OOM_ADJ_REASON_METHOD + "_removeProvider";
static final String OOM_ADJ_REASON_UI_VISIBILITY = OOM_ADJ_REASON_METHOD + "_uiVisibility";
static final String OOM_ADJ_REASON_ALLOWLIST = OOM_ADJ_REASON_METHOD + "_allowlistChange";
static final String OOM_ADJ_REASON_PROCESS_BEGIN = OOM_ADJ_REASON_METHOD + "_processBegin";
static final String OOM_ADJ_REASON_PROCESS_END = OOM_ADJ_REASON_METHOD + "_processEnd";
/**
* Flag {@link android.content.Context#BIND_INCLUDE_CAPABILITIES} is used
* to pass while-in-use capabilities from client process to bound service. In targetSdkVersion
* R and above, if client is a TOP activity, when this flag is present, bound service gets all
* while-in-use capabilities; when this flag is not present, bound service gets no while-in-use
* capability from client.
*/
@ChangeId
@EnabledAfter(targetSdkVersion=android.os.Build.VERSION_CODES.Q)
static final long PROCESS_CAPABILITY_CHANGE_ID = 136274596L;
/**
* In targetSdkVersion R and above, foreground service has camera and microphone while-in-use
* capability only when the {@link android.R.attr#foregroundServiceType} is configured as
* {@link android.content.pm.ServiceInfo#FOREGROUND_SERVICE_TYPE_CAMERA} and
* {@link android.content.pm.ServiceInfo#FOREGROUND_SERVICE_TYPE_MICROPHONE} respectively in the
* manifest file.
* In targetSdkVersion below R, foreground service automatically have camera and microphone
* capabilities.
*/
@ChangeId
@EnabledAfter(targetSdkVersion=android.os.Build.VERSION_CODES.Q)
static final long CAMERA_MICROPHONE_CAPABILITY_CHANGE_ID = 136219221L;
/**
* For apps targeting S+, this determines whether to use a shorter timeout before elevating the
* standby bucket to ACTIVE when apps start a foreground service.
*/
@ChangeId
@EnabledSince(targetSdkVersion = android.os.Build.VERSION_CODES.S)
static final long USE_SHORT_FGS_USAGE_INTERACTION_TIME = 183972877L;
/**
* For some direct access we need to power manager.
*/
PowerManagerInternal mLocalPowerManager;
/**
* Service for optimizing resource usage from background apps.
*/
CachedAppOptimizer mCachedAppOptimizer;
/**
* Re-rank apps getting a cache oom adjustment from lru to weighted order
* based on weighted scores for LRU, PSS and cache use count.
*/
CacheOomRanker mCacheOomRanker;
ActivityManagerConstants mConstants;
final long[] mTmpLong = new long[3];
/**
* Current sequence id for oom_adj computation traversal.
*/
int mAdjSeq = 0;
/**
* Keep track of the number of service processes we last found, to
* determine on the next iteration which should be B services.
*/
int mNumServiceProcs = 0;
int mNewNumAServiceProcs = 0;
int mNewNumServiceProcs = 0;
/**
* Keep track of the non-cached/empty process we last found, to help
* determine how to distribute cached/empty processes next time.
*/
int mNumNonCachedProcs = 0;
/**
* Keep track of the number of cached hidden procs, to balance oom adj
* distribution between those and empty procs.
*/
int mNumCachedHiddenProcs = 0;
/** Track all uids that have actively running processes. */
@CompositeRWLock({"mService", "mProcLock"})
ActiveUids mActiveUids;
/**
* The handler to execute {@link #setProcessGroup} (it may be heavy if the process has many
* threads) for reducing the time spent in {@link #applyOomAdjLSP}.
*/
private final Handler mProcessGroupHandler;
private final ArraySet<BroadcastQueue> mTmpBroadcastQueue = new ArraySet();
private final ActivityManagerService mService;
private final ProcessList mProcessList;
private final ActivityManagerGlobalLock mProcLock;
private final int mNumSlots;
private final ArrayList<ProcessRecord> mTmpProcessList = new ArrayList<ProcessRecord>();
private final ArrayList<UidRecord> mTmpBecameIdle = new ArrayList<UidRecord>();
private final ActiveUids mTmpUidRecords;
private final ArrayDeque<ProcessRecord> mTmpQueue;
private final ArraySet<ProcessRecord> mPendingProcessSet = new ArraySet<>();
private final ArraySet<ProcessRecord> mProcessesInCycle = new ArraySet<>();
/**
* Flag to mark if there is an ongoing oomAdjUpdate: potentially the oomAdjUpdate
* could be called recursively because of the indirect calls during the update;
* however the oomAdjUpdate itself doesn't support recursion - in this case we'd
* have to queue up the new targets found during the update, and perform another
* round of oomAdjUpdate at the end of last update.
*/
@GuardedBy("mService")
private boolean mOomAdjUpdateOngoing = false;
/**
* Flag to mark if there is a pending full oomAdjUpdate.
*/
@GuardedBy("mService")
private boolean mPendingFullOomAdjUpdate = false;
/** Overrideable by a test */
@VisibleForTesting
protected boolean isChangeEnabled(@CachedCompatChangeId int cachedCompatChangeId,
ApplicationInfo app, boolean defaultValue) {
return PlatformCompatCache.getInstance()
.isChangeEnabled(cachedCompatChangeId, app, defaultValue);
}
OomAdjuster(ActivityManagerService service, ProcessList processList, ActiveUids activeUids) {
this(service, processList, activeUids, createAdjusterThread());
}
private static ServiceThread createAdjusterThread() {
// The process group is usually critical to the response time of foreground app, so the
// setter should apply it as soon as possible.
final ServiceThread adjusterThread =
new ServiceThread(TAG, THREAD_PRIORITY_TOP_APP_BOOST, false /* allowIo */);
adjusterThread.start();
return adjusterThread;
}
OomAdjuster(ActivityManagerService service, ProcessList processList, ActiveUids activeUids,
ServiceThread adjusterThread) {
mService = service;
mProcessList = processList;
mProcLock = service.mProcLock;
mActiveUids = activeUids;
mLocalPowerManager = LocalServices.getService(PowerManagerInternal.class);
mConstants = mService.mConstants;
mCachedAppOptimizer = new CachedAppOptimizer(mService);
mCacheOomRanker = new CacheOomRanker(service);
mProcessGroupHandler = new Handler(adjusterThread.getLooper(), msg -> {
final int pid = msg.arg1;
final int group = msg.arg2;
if (pid == ActivityManagerService.MY_PID) {
// Skip setting the process group for system_server, keep it as default.
return true;
}
if (Trace.isTagEnabled(Trace.TRACE_TAG_ACTIVITY_MANAGER)) {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "setProcessGroup "
+ msg.obj + " to " + group);
}
try {
setProcessGroup(pid, group);
} catch (Exception e) {
if (DEBUG_ALL) {
Slog.w(TAG, "Failed setting process group of " + pid + " to " + group, e);
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
}
return true;
});
mTmpUidRecords = new ActiveUids(service, false);
mTmpQueue = new ArrayDeque<ProcessRecord>(mConstants.CUR_MAX_CACHED_PROCESSES << 1);
mNumSlots = ((ProcessList.CACHED_APP_MAX_ADJ - ProcessList.CACHED_APP_MIN_ADJ + 1) >> 1)
/ ProcessList.CACHED_APP_IMPORTANCE_LEVELS;
}
void initSettings() {
mCachedAppOptimizer.init();
mCacheOomRanker.init(ActivityThread.currentApplication().getMainExecutor());
if (mService.mConstants.KEEP_WARMING_SERVICES.size() > 0) {
final IntentFilter filter = new IntentFilter(Intent.ACTION_USER_SWITCHED);
mService.mContext.registerReceiverForAllUsers(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
synchronized (mService) {
handleUserSwitchedLocked();
}
}
}, filter, null, mService.mHandler);
}
}
/**
* Update the keep-warming service flags upon user switches
*/
@VisibleForTesting
@GuardedBy("mService")
void handleUserSwitchedLocked() {
mProcessList.forEachLruProcessesLOSP(false,
this::updateKeepWarmIfNecessaryForProcessLocked);
}
@GuardedBy("mService")
private void updateKeepWarmIfNecessaryForProcessLocked(final ProcessRecord app) {
final ArraySet<ComponentName> warmServices = mService.mConstants.KEEP_WARMING_SERVICES;
boolean includeWarmPkg = false;
final PackageList pkgList = app.getPkgList();
for (int j = warmServices.size() - 1; j >= 0; j--) {
if (pkgList.containsKey(warmServices.valueAt(j).getPackageName())) {
includeWarmPkg = true;
break;
}
}
if (!includeWarmPkg) {
return;
}
final ProcessServiceRecord psr = app.mServices;
for (int j = psr.numberOfRunningServices() - 1; j >= 0; j--) {
psr.getRunningServiceAt(j).updateKeepWarmLocked();
}
}
/**
* Perform oom adj update on the given process. It does NOT do the re-computation
* if there is a cycle, caller should check {@link #mProcessesInCycle} and do it on its own.
*/
@GuardedBy({"mService", "mProcLock"})
private boolean performUpdateOomAdjLSP(ProcessRecord app, int cachedAdj,
ProcessRecord topApp, long now, String oomAdjReason) {
if (app.getThread() == null) {
return false;
}
app.mState.resetCachedInfo();
app.mState.setCurBoundByNonBgRestrictedApp(false);
UidRecord uidRec = app.getUidRecord();
if (uidRec != null) {
if (DEBUG_UID_OBSERVERS) {
Slog.i(TAG_UID_OBSERVERS, "Starting update of " + uidRec);
}
uidRec.reset();
}
// Check if this process is in the pending list too, remove from pending list if so.
mPendingProcessSet.remove(app);
mProcessesInCycle.clear();
computeOomAdjLSP(app, cachedAdj, topApp, false, now, false, true);
if (!mProcessesInCycle.isEmpty()) {
// We can't use the score here if there is a cycle, abort.
for (int i = mProcessesInCycle.size() - 1; i >= 0; i--) {
// Reset the adj seq
mProcessesInCycle.valueAt(i).mState.setCompletedAdjSeq(mAdjSeq - 1);
}
return true;
}
if (uidRec != null) {
// After uidRec.reset() above, for UidRecord with multiple processes (ProcessRecord),
// we need to apply all ProcessRecord into UidRecord.
uidRec.forEachProcess(this::updateAppUidRecIfNecessaryLSP);
if (uidRec.getCurProcState() != PROCESS_STATE_NONEXISTENT
&& (uidRec.getSetProcState() != uidRec.getCurProcState()
|| uidRec.getSetCapability() != uidRec.getCurCapability()
|| uidRec.isSetAllowListed() != uidRec.isCurAllowListed())) {
ActiveUids uids = mTmpUidRecords;
uids.clear();
uids.put(uidRec.getUid(), uidRec);
updateUidsLSP(uids, SystemClock.elapsedRealtime());
}
}
return applyOomAdjLSP(app, false, now, SystemClock.elapsedRealtime(), oomAdjReason);
}
/**
* Update OomAdj for all processes in LRU list
*/
@GuardedBy("mService")
void updateOomAdjLocked(String oomAdjReason) {
synchronized (mProcLock) {
updateOomAdjLSP(oomAdjReason);
}
}
@GuardedBy({"mService", "mProcLock"})
private void updateOomAdjLSP(String oomAdjReason) {
if (checkAndEnqueueOomAdjTargetLocked(null)) {
// Simply return as there is an oomAdjUpdate ongoing
return;
}
try {
mOomAdjUpdateOngoing = true;
performUpdateOomAdjLSP(oomAdjReason);
} finally {
// Kick off the handling of any pending targets enqueued during the above update
mOomAdjUpdateOngoing = false;
updateOomAdjPendingTargetsLocked(oomAdjReason);
}
}
@GuardedBy({"mService", "mProcLock"})
private void performUpdateOomAdjLSP(String oomAdjReason) {
final ProcessRecord topApp = mService.getTopApp();
// Clear any pending ones because we are doing a full update now.
mPendingProcessSet.clear();
mService.mAppProfiler.mHasPreviousProcess = mService.mAppProfiler.mHasHomeProcess = false;
updateOomAdjInnerLSP(oomAdjReason, topApp , null, null, true, true);
}
/**
* Update OomAdj for specific process and its reachable processes (with direction/indirect
* bindings from this process); Note its clients' proc state won't be re-evaluated if this proc
* is hosting any service/content provider.
*
* @param app The process to update, or null to update all processes
* @param oomAdjReason
*/
@GuardedBy("mService")
boolean updateOomAdjLocked(ProcessRecord app, String oomAdjReason) {
synchronized (mProcLock) {
return updateOomAdjLSP(app, oomAdjReason);
}
}
@GuardedBy({"mService", "mProcLock"})
private boolean updateOomAdjLSP(ProcessRecord app, String oomAdjReason) {
if (app == null || !mConstants.OOMADJ_UPDATE_QUICK) {
updateOomAdjLSP(oomAdjReason);
return true;
}
if (checkAndEnqueueOomAdjTargetLocked(app)) {
// Simply return true as there is an oomAdjUpdate ongoing
return true;
}
try {
mOomAdjUpdateOngoing = true;
return performUpdateOomAdjLSP(app, oomAdjReason);
} finally {
// Kick off the handling of any pending targets enqueued during the above update
mOomAdjUpdateOngoing = false;
updateOomAdjPendingTargetsLocked(oomAdjReason);
}
}
@GuardedBy({"mService", "mProcLock"})
private boolean performUpdateOomAdjLSP(ProcessRecord app, String oomAdjReason) {
final ProcessRecord topApp = mService.getTopApp();
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, oomAdjReason);
mService.mOomAdjProfiler.oomAdjStarted();
mAdjSeq++;
// Firstly, try to see if the importance of itself gets changed
final ProcessStateRecord state = app.mState;
final boolean wasCached = state.isCached();
final int oldAdj = state.getCurRawAdj();
final int cachedAdj = oldAdj >= ProcessList.CACHED_APP_MIN_ADJ
? oldAdj : ProcessList.UNKNOWN_ADJ;
final boolean wasBackground = ActivityManager.isProcStateBackground(
state.getSetProcState());
final int oldCap = state.getSetCapability();
state.setContainsCycle(false);
state.setProcStateChanged(false);
state.resetCachedInfo();
state.setCurBoundByNonBgRestrictedApp(false);
// Check if this process is in the pending list too, remove from pending list if so.
mPendingProcessSet.remove(app);
boolean success = performUpdateOomAdjLSP(app, cachedAdj, topApp,
SystemClock.uptimeMillis(), oomAdjReason);
// The 'app' here itself might or might not be in the cycle, for example,
// the case A <=> B vs. A -> B <=> C; anyway, if we spot a cycle here, re-compute them.
if (!success || (wasCached == state.isCached() && oldAdj != ProcessList.INVALID_ADJ
&& mProcessesInCycle.isEmpty() /* Force re-compute if there is a cycle */
&& oldCap == state.getCurCapability()
&& wasBackground == ActivityManager.isProcStateBackground(
state.getSetProcState()))) {
mProcessesInCycle.clear();
// Okay, it's unchanged, it won't impact any service it binds to, we're done here.
if (DEBUG_OOM_ADJ) {
Slog.i(TAG_OOM_ADJ, "No oomadj changes for " + app);
}
mService.mOomAdjProfiler.oomAdjEnded();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
return success;
}
// Next to find out all its reachable processes
ArrayList<ProcessRecord> processes = mTmpProcessList;
ActiveUids uids = mTmpUidRecords;
mPendingProcessSet.add(app);
// Add all processes with cycles into the list to scan
for (int i = mProcessesInCycle.size() - 1; i >= 0; i--) {
mPendingProcessSet.add(mProcessesInCycle.valueAt(i));
}
mProcessesInCycle.clear();
boolean containsCycle = collectReachableProcessesLocked(mPendingProcessSet,
processes, uids);
// Clear the pending set as they should've been included in 'processes'.
mPendingProcessSet.clear();
if (!containsCycle) {
// Reset the flag
state.setReachable(false);
// Remove this app from the return list because we've done the computation on it.
processes.remove(app);
}
int size = processes.size();
if (size > 0) {
mAdjSeq--;
// Update these reachable processes
updateOomAdjInnerLSP(oomAdjReason, topApp, processes, uids, containsCycle, false);
} else if (state.getCurRawAdj() == ProcessList.UNKNOWN_ADJ) {
// In case the app goes from non-cached to cached but it doesn't have other reachable
// processes, its adj could be still unknown as of now, assign one.
processes.add(app);
assignCachedAdjIfNecessary(processes);
applyOomAdjLSP(app, false, SystemClock.uptimeMillis(),
SystemClock.elapsedRealtime(), oomAdjReason);
}
mTmpProcessList.clear();
mService.mOomAdjProfiler.oomAdjEnded();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
return true;
}
@GuardedBy("mService")
private boolean collectReachableProcessesLocked(ArraySet<ProcessRecord> apps,
ArrayList<ProcessRecord> processes, ActiveUids uids) {
final ArrayDeque<ProcessRecord> queue = mTmpQueue;
queue.clear();
processes.clear();
for (int i = 0, size = apps.size(); i < size; i++) {
final ProcessRecord app = apps.valueAt(i);
app.mState.setReachable(true);
queue.offer(app);
}
uids.clear();
// Track if any of them reachables could include a cycle
boolean containsCycle = false;
// Scan downstreams of the process record
for (ProcessRecord pr = queue.poll(); pr != null; pr = queue.poll()) {
processes.add(pr);
final UidRecord uidRec = pr.getUidRecord();
if (uidRec != null) {
uids.put(uidRec.getUid(), uidRec);
}
final ProcessServiceRecord psr = pr.mServices;
for (int i = psr.numberOfConnections() - 1; i >= 0; i--) {
ConnectionRecord cr = psr.getConnectionAt(i);
ProcessRecord service = (cr.flags & ServiceInfo.FLAG_ISOLATED_PROCESS) != 0
? cr.binding.service.isolationHostProc : cr.binding.service.app;
if (service == null || service == pr) {
continue;
}
containsCycle |= service.mState.isReachable();
if (service.mState.isReachable()) {
continue;
}
if ((cr.flags & (Context.BIND_WAIVE_PRIORITY
| Context.BIND_TREAT_LIKE_ACTIVITY
| Context.BIND_ADJUST_WITH_ACTIVITY))
== Context.BIND_WAIVE_PRIORITY) {
continue;
}
queue.offer(service);
service.mState.setReachable(true);
}
final ProcessProviderRecord ppr = pr.mProviders;
for (int i = ppr.numberOfProviderConnections() - 1; i >= 0; i--) {
ContentProviderConnection cpc = ppr.getProviderConnectionAt(i);
ProcessRecord provider = cpc.provider.proc;
if (provider == null || provider == pr) {
continue;
}
containsCycle |= provider.mState.isReachable();
if (provider.mState.isReachable()) {
continue;
}
queue.offer(provider);
provider.mState.setReachable(true);
}
}
int size = processes.size();
if (size > 0) {
// Reverse the process list, since the updateOomAdjInnerLSP scans from the end of it.
for (int l = 0, r = size - 1; l < r; l++, r--) {
ProcessRecord t = processes.get(l);
processes.set(l, processes.get(r));
processes.set(r, t);
}
}
return containsCycle;
}
/**
* Enqueue the given process for a later oom adj update
*/
@GuardedBy("mService")
void enqueueOomAdjTargetLocked(ProcessRecord app) {
if (app != null) {
mPendingProcessSet.add(app);
}
}
@GuardedBy("mService")
void removeOomAdjTargetLocked(ProcessRecord app, boolean procDied) {
if (app != null) {
mPendingProcessSet.remove(app);
if (procDied) {
PlatformCompatCache.getInstance().invalidate(app.info);
}
}
}
/**
* Check if there is an ongoing oomAdjUpdate, enqueue the given process record
* to {@link #mPendingProcessSet} if there is one.
*
* @param app The target app to get an oomAdjUpdate, or a full oomAdjUpdate if it's null.
* @return {@code true} if there is an ongoing oomAdjUpdate.
*/
@GuardedBy("mService")
private boolean checkAndEnqueueOomAdjTargetLocked(@Nullable ProcessRecord app) {
if (!mOomAdjUpdateOngoing) {
return false;
}
if (app != null) {
mPendingProcessSet.add(app);
} else {
mPendingFullOomAdjUpdate = true;
}
return true;
}
/**
* Kick off an oom adj update pass for the pending targets which are enqueued via
* {@link #enqueueOomAdjTargetLocked}.
*/
@GuardedBy("mService")
void updateOomAdjPendingTargetsLocked(String oomAdjReason) {
// First check if there is pending full update
if (mPendingFullOomAdjUpdate) {
mPendingFullOomAdjUpdate = false;
mPendingProcessSet.clear();
updateOomAdjLocked(oomAdjReason);
return;
}
if (mPendingProcessSet.isEmpty()) {
return;
}
if (mOomAdjUpdateOngoing) {
// There's another oomAdjUpdate ongoing, return from here now;
// that ongoing update would call us again at the end of it.
return;
}
try {
mOomAdjUpdateOngoing = true;
performUpdateOomAdjPendingTargetsLocked(oomAdjReason);
} finally {
// Kick off the handling of any pending targets enqueued during the above update
mOomAdjUpdateOngoing = false;
updateOomAdjPendingTargetsLocked(oomAdjReason);
}
}
@GuardedBy("mService")
private void performUpdateOomAdjPendingTargetsLocked(String oomAdjReason) {
final ProcessRecord topApp = mService.getTopApp();
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, oomAdjReason);
mService.mOomAdjProfiler.oomAdjStarted();
final ArrayList<ProcessRecord> processes = mTmpProcessList;
final ActiveUids uids = mTmpUidRecords;
collectReachableProcessesLocked(mPendingProcessSet, processes, uids);
mPendingProcessSet.clear();
synchronized (mProcLock) {
updateOomAdjInnerLSP(oomAdjReason, topApp, processes, uids, true, false);
}
processes.clear();
mService.mOomAdjProfiler.oomAdjEnded();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
}
/**
* Update OomAdj for all processes within the given list (could be partial), or the whole LRU
* list if the given list is null; when it's partial update, each process's client proc won't
* get evaluated recursively here.
*/
@GuardedBy({"mService", "mProcLock"})
private void updateOomAdjInnerLSP(String oomAdjReason, final ProcessRecord topApp,
ArrayList<ProcessRecord> processes, ActiveUids uids, boolean potentialCycles,
boolean startProfiling) {
if (startProfiling) {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, oomAdjReason);
mService.mOomAdjProfiler.oomAdjStarted();
}
final long now = SystemClock.uptimeMillis();
final long nowElapsed = SystemClock.elapsedRealtime();
final long oldTime = now - mConstants.mMaxEmptyTimeMillis;
final boolean fullUpdate = processes == null;
ActiveUids activeUids = uids;
ArrayList<ProcessRecord> activeProcesses = fullUpdate ? mProcessList.getLruProcessesLOSP()
: processes;
final int numProc = activeProcesses.size();
if (activeUids == null) {
final int numUids = mActiveUids.size();
activeUids = mTmpUidRecords;
activeUids.clear();
for (int i = 0; i < numUids; i++) {
UidRecord uidRec = mActiveUids.valueAt(i);
activeUids.put(uidRec.getUid(), uidRec);
}
}
// Reset state in all uid records.
for (int i = activeUids.size() - 1; i >= 0; i--) {
final UidRecord uidRec = activeUids.valueAt(i);
if (DEBUG_UID_OBSERVERS) {
Slog.i(TAG_UID_OBSERVERS, "Starting update of " + uidRec);
}
uidRec.reset();
}
mAdjSeq++;
if (fullUpdate) {
mNewNumServiceProcs = 0;
mNewNumAServiceProcs = 0;
}
boolean retryCycles = false;
boolean computeClients = fullUpdate || potentialCycles;
// need to reset cycle state before calling computeOomAdjLSP because of service conns
for (int i = numProc - 1; i >= 0; i--) {
ProcessRecord app = activeProcesses.get(i);
final ProcessStateRecord state = app.mState;
state.setReachable(false);
// No need to compute again it has been evaluated in previous iteration
if (state.getAdjSeq() != mAdjSeq) {
state.setContainsCycle(false);
state.setCurRawProcState(PROCESS_STATE_CACHED_EMPTY);
state.setCurRawAdj(ProcessList.UNKNOWN_ADJ);
state.setSetCapability(PROCESS_CAPABILITY_NONE);
state.resetCachedInfo();
state.setCurBoundByNonBgRestrictedApp(false);
}
}
mProcessesInCycle.clear();
for (int i = numProc - 1; i >= 0; i--) {
ProcessRecord app = activeProcesses.get(i);
final ProcessStateRecord state = app.mState;
if (!app.isKilledByAm() && app.getThread() != null) {
state.setProcStateChanged(false);
computeOomAdjLSP(app, ProcessList.UNKNOWN_ADJ, topApp, fullUpdate, now, false,
computeClients); // It won't enter cycle if not computing clients.
// if any app encountered a cycle, we need to perform an additional loop later
retryCycles |= state.containsCycle();
// Keep the completedAdjSeq to up to date.
state.setCompletedAdjSeq(mAdjSeq);
}
}
if (mCacheOomRanker.useOomReranking()) {
mCacheOomRanker.reRankLruCachedAppsLSP(mProcessList.getLruProcessesLSP(),
mProcessList.getLruProcessServiceStartLOSP());
}
assignCachedAdjIfNecessary(mProcessList.getLruProcessesLOSP());
if (computeClients) { // There won't be cycles if we didn't compute clients above.
// Cycle strategy:
// - Retry computing any process that has encountered a cycle.
// - Continue retrying until no process was promoted.
// - Iterate from least important to most important.
int cycleCount = 0;
while (retryCycles && cycleCount < 10) {
cycleCount++;
retryCycles = false;
for (int i = 0; i < numProc; i++) {
ProcessRecord app = activeProcesses.get(i);
final ProcessStateRecord state = app.mState;
if (!app.isKilledByAm() && app.getThread() != null && state.containsCycle()) {
state.decAdjSeq();
state.decCompletedAdjSeq();
}
}
for (int i = 0; i < numProc; i++) {
ProcessRecord app = activeProcesses.get(i);
final ProcessStateRecord state = app.mState;
if (!app.isKilledByAm() && app.getThread() != null && state.containsCycle()) {
if (computeOomAdjLSP(app, state.getCurRawAdj(), topApp, true, now,
true, true)) {
retryCycles = true;
}
}
}
}
}
mProcessesInCycle.clear();
mNumNonCachedProcs = 0;
mNumCachedHiddenProcs = 0;
boolean allChanged = updateAndTrimProcessLSP(now, nowElapsed, oldTime, activeUids,
oomAdjReason);
mNumServiceProcs = mNewNumServiceProcs;
if (mService.mAlwaysFinishActivities) {
// Need to do this on its own message because the stack may not
// be in a consistent state at this point.
mService.mAtmInternal.scheduleDestroyAllActivities("always-finish");
}
if (allChanged) {
mService.mAppProfiler.requestPssAllProcsLPr(now, false,
mService.mProcessStats.isMemFactorLowered());
}
updateUidsLSP(activeUids, nowElapsed);
synchronized (mService.mProcessStats.mLock) {
final long nowUptime = SystemClock.uptimeMillis();
if (mService.mProcessStats.shouldWriteNowLocked(nowUptime)) {
mService.mHandler.post(new ActivityManagerService.ProcStatsRunnable(mService,
mService.mProcessStats));
}
// Run this after making sure all procstates are updated.
mService.mProcessStats.updateTrackingAssociationsLocked(mAdjSeq, nowUptime);
}
if (DEBUG_OOM_ADJ) {
final long duration = SystemClock.uptimeMillis() - now;
if (false) {
Slog.d(TAG_OOM_ADJ, "Did OOM ADJ in " + duration + "ms",
new RuntimeException("here").fillInStackTrace());
} else {
Slog.d(TAG_OOM_ADJ, "Did OOM ADJ in " + duration + "ms");
}
}
if (startProfiling) {
mService.mOomAdjProfiler.oomAdjEnded();
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
}
}
@GuardedBy({"mService", "mProcLock"})
private void assignCachedAdjIfNecessary(ArrayList<ProcessRecord> lruList) {
final int numLru = lruList.size();
// First update the OOM adjustment for each of the
// application processes based on their current state.
int curCachedAdj = ProcessList.CACHED_APP_MIN_ADJ;
int nextCachedAdj = curCachedAdj + (ProcessList.CACHED_APP_IMPORTANCE_LEVELS * 2);
int curCachedImpAdj = 0;
int curEmptyAdj = ProcessList.CACHED_APP_MIN_ADJ + ProcessList.CACHED_APP_IMPORTANCE_LEVELS;
int nextEmptyAdj = curEmptyAdj + (ProcessList.CACHED_APP_IMPORTANCE_LEVELS * 2);
final int emptyProcessLimit = mConstants.CUR_MAX_EMPTY_PROCESSES;
final int cachedProcessLimit = mConstants.CUR_MAX_CACHED_PROCESSES
- emptyProcessLimit;
// Let's determine how many processes we have running vs.
// how many slots we have for background processes; we may want
// to put multiple processes in a slot of there are enough of
// them.
int numEmptyProcs = numLru - mNumNonCachedProcs - mNumCachedHiddenProcs;
if (numEmptyProcs > cachedProcessLimit) {
// If there are more empty processes than our limit on cached
// processes, then use the cached process limit for the factor.
// This ensures that the really old empty processes get pushed
// down to the bottom, so if we are running low on memory we will
// have a better chance at keeping around more cached processes
// instead of a gazillion empty processes.
numEmptyProcs = cachedProcessLimit;
}
int cachedFactor = (mNumCachedHiddenProcs > 0 ? (mNumCachedHiddenProcs + mNumSlots - 1) : 1)
/ mNumSlots;
if (cachedFactor < 1) cachedFactor = 1;
int emptyFactor = (numEmptyProcs + mNumSlots - 1) / mNumSlots;
if (emptyFactor < 1) emptyFactor = 1;
int stepCached = -1;
int stepEmpty = -1;
int lastCachedGroup = 0;
int lastCachedGroupImportance = 0;
int lastCachedGroupUid = 0;
for (int i = numLru - 1; i >= 0; i--) {
ProcessRecord app = lruList.get(i);
final ProcessStateRecord state = app.mState;
// If we haven't yet assigned the final cached adj
// to the process, do that now.
if (!app.isKilledByAm() && app.getThread() != null && state.getCurAdj()
>= ProcessList.UNKNOWN_ADJ) {
final ProcessServiceRecord psr = app.mServices;
switch (state.getCurProcState()) {
case PROCESS_STATE_CACHED_ACTIVITY:
case ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT:
case ActivityManager.PROCESS_STATE_CACHED_RECENT:
// Figure out the next cached level, taking into account groups.
boolean inGroup = false;
final int connectionGroup = psr.getConnectionGroup();
if (connectionGroup != 0) {
final int connectionImportance = psr.getConnectionImportance();
if (lastCachedGroupUid == app.uid
&& lastCachedGroup == connectionGroup) {
// This is in the same group as the last process, just tweak
// adjustment by importance.
if (connectionImportance > lastCachedGroupImportance) {
lastCachedGroupImportance = connectionImportance;
if (curCachedAdj < nextCachedAdj
&& curCachedAdj < ProcessList.CACHED_APP_MAX_ADJ) {
curCachedImpAdj++;
}
}
inGroup = true;
} else {
lastCachedGroupUid = app.uid;
lastCachedGroup = connectionGroup;
lastCachedGroupImportance = connectionImportance;
}
}
if (!inGroup && curCachedAdj != nextCachedAdj) {
stepCached++;
curCachedImpAdj = 0;
if (stepCached >= cachedFactor) {
stepCached = 0;
curCachedAdj = nextCachedAdj;
nextCachedAdj += ProcessList.CACHED_APP_IMPORTANCE_LEVELS * 2;
if (nextCachedAdj > ProcessList.CACHED_APP_MAX_ADJ) {
nextCachedAdj = ProcessList.CACHED_APP_MAX_ADJ;
}
}
}
// This process is a cached process holding activities...
// assign it the next cached value for that type, and then
// step that cached level.
state.setCurRawAdj(curCachedAdj + curCachedImpAdj);
state.setCurAdj(psr.modifyRawOomAdj(curCachedAdj + curCachedImpAdj));
if (DEBUG_LRU) {
Slog.d(TAG_LRU, "Assigning activity LRU #" + i
+ " adj: " + state.getCurAdj()
+ " (curCachedAdj=" + curCachedAdj