接上篇
computeOomAdjLocked
// ActivityManagerService.java
private final int computeOomAdjLocked(ProcessRecord app, int cachedAdj, ProcessRecord TOP_APP,
boolean doingAll, long now) {
if (mAdjSeq == app.adjSeq) {
// This adjustment has already been computed.
return app.curRawAdj;
}
if (app.thread == null) {
app.adjSeq = mAdjSeq;
app.curSchedGroup = Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.curProcState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
return (app.curAdj=app.curRawAdj=ProcessList.CACHED_APP_MAX_ADJ);
}
app.adjTypeCode = ActivityManager.RunningAppProcessInfo.REASON_UNKNOWN;
app.adjSource = null;
app.adjTarget = null;
app.empty = false;
app.cached = false;
final int activitiesSize = app.activities.size();
if (app.maxAdj <= ProcessList.FOREGROUND_APP_ADJ) { // 前台：adj 0
// The max adjustment doesn't allow this app to be anything
// below foreground, so it is not worth doing work for it.
app.adjType = "fixed";
app.adjSeq = mAdjSeq;
app.curRawAdj = app.maxAdj;
app.foregroundActivities = false;
app.curSchedGroup = Process.THREAD_GROUP_DEFAULT;
app.curProcState = ActivityManager.PROCESS_STATE_PERSISTENT;
// System processes can do UI, and when they do we want to have
// them trim their memory after the user leaves the UI. To
// facilitate this, here we need to determine whether or not it
// is currently showing UI.
app.systemNoUi = true;
if (app == TOP_APP) {
app.systemNoUi = false;
} else if (activitiesSize > 0) {
for (int j = 0; j < activitiesSize; j++) {
final ActivityRecord r = app.activities.get(j);
if (r.visible) {
app.systemNoUi = false;
}
}
}
if (!app.systemNoUi) {
app.curProcState = ActivityManager.PROCESS_STATE_PERSISTENT_UI;
}
return (app.curAdj=app.maxAdj);
}
app.systemNoUi = false;
final int PROCESS_STATE_TOP = mTopProcessState;
// 确定进程优先级，从高到低，分配一个合适的 OOM_ADJ
// Determine the importance of the process, starting with most
// important to least, and assign an appropriate OOM adjustment.
int adj;
int schedGroup;
int procState;
boolean foregroundActivities = false;
BroadcastQueue queue;
if (app == TOP_APP) { // 1. 前台应用
// The last app on the list is the foreground app.
adj = ProcessList.FOREGROUND_APP_ADJ;
schedGroup = Process.THREAD_GROUP_DEFAULT;
app.adjType = "top-activity";
foregroundActivities = true;
procState = PROCESS_STATE_TOP;
} else if (app.instrumentationClass != null) { // 2. instrumentation
// Don't want to kill running instrumentation.
adj = ProcessList.FOREGROUND_APP_ADJ;
schedGroup = Process.THREAD_GROUP_DEFAULT;
app.adjType = "instrumentation";
procState = ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE;
} else if ((queue = isReceivingBroadcast(app)) != null) { // 正在接收 Broadcast
// An app that is currently receiving a broadcast also
// counts as being in the foreground for OOM killer purposes.
// It's placed in a sched group based on the nature of the
// broadcast as reflected by which queue it's active in.
adj = ProcessList.FOREGROUND_APP_ADJ;
schedGroup = (queue == mFgBroadcastQueue)
? Process.THREAD_GROUP_DEFAULT : Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.adjType = "broadcast";
procState = ActivityManager.PROCESS_STATE_RECEIVER;
} else if (app.executingServices.size() > 0) { // 正在执行 Service 回调
// An app that is currently executing a service callback also
// counts as being in the foreground.
adj = ProcessList.FOREGROUND_APP_ADJ;
schedGroup = app.execServicesFg ?
Process.THREAD_GROUP_DEFAULT : Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.adjType = "exec-service";
procState = ActivityManager.PROCESS_STATE_SERVICE;
//Slog.i(TAG, "EXEC " + (app.execServicesFg ? "FG" : "BG") + ": " + app);
} else { // 其他条件暂时认定empty，缓存
// As far as we know the process is empty. We may change our mind later.
schedGroup = Process.THREAD_GROUP_BG_NONINTERACTIVE;
// At this point we don't actually know the adjustment. Use the cached adj
// value that the caller wants us to.
adj = cachedAdj;
procState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
app.cached = true;
app.empty = true;
app.adjType = "cch-empty";
}
// Examine all activities if not already foreground.
if (!foregroundActivities && activitiesSize > 0) { // 非前台时，继续对所有 Activity 进行判定
for (int j = 0; j < activitiesSize; j++) {
final ActivityRecord r = app.activities.get(j);
if (r.app != app) {
Slog.w(TAG, "Wtf, activity " + r + " in proc activity list not using proc "
+ app + "?!? Using " + r.app + " instead.");
continue;
}
if (r.visible) {
// App has a visible activity; only upgrade adjustment.
// Visible
if (adj > ProcessList.VISIBLE_APP_ADJ) {
adj = ProcessList.VISIBLE_APP_ADJ;
app.adjType = "visible";
}
if (procState > PROCESS_STATE_TOP) {
procState = PROCESS_STATE_TOP;
}
schedGroup = Process.THREAD_GROUP_DEFAULT;
app.cached = false;
app.empty = false;
foregroundActivities = true;
break;
} else if (r.state == ActivityState.PAUSING || r.state == ActivityState.PAUSED) {
if (adj > ProcessList.PERCEPTIBLE_APP_ADJ) {
adj = ProcessList.PERCEPTIBLE_APP_ADJ;
app.adjType = "pausing";
}
if (procState > PROCESS_STATE_TOP) {
procState = PROCESS_STATE_TOP;
}
schedGroup = Process.THREAD_GROUP_DEFAULT;
app.cached = false;
app.empty = false;
foregroundActivities = true;
} else if (r.state == ActivityState.STOPPING) {
if (adj > ProcessList.PERCEPTIBLE_APP_ADJ) {
adj = ProcessList.PERCEPTIBLE_APP_ADJ;
app.adjType = "stopping";
}
// For the process state, we will at this point consider the
// process to be cached. It will be cached either as an activity
// or empty depending on whether the activity is finishing. We do
// this so that we can treat the process as cached for purposes of
// memory trimming (determing current memory level, trim command to
// send to process) since there can be an arbitrary number of stopping
// processes and they should soon all go into the cached state.
if (!r.finishing) {
if (procState > ActivityManager.PROCESS_STATE_LAST_ACTIVITY) {
procState = ActivityManager.PROCESS_STATE_LAST_ACTIVITY;
}
}
app.cached = false;
app.empty = false;
foregroundActivities = true;
} else {
if (procState > ActivityManager.PROCESS_STATE_CACHED_ACTIVITY) {
procState = ActivityManager.PROCESS_STATE_CACHED_ACTIVITY;
app.adjType = "cch-act";
}
}
}
}
if (adj > ProcessList.PERCEPTIBLE_APP_ADJ) {
if (app.foregroundServices) {
// The user is aware of this app, so make it visible.
adj = ProcessList.PERCEPTIBLE_APP_ADJ;
procState = ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE;
app.cached = false;
app.adjType = "fg-service";
schedGroup = Process.THREAD_GROUP_DEFAULT;
} else if (app.forcingToForeground != null) {
// The user is aware of this app, so make it visible.
adj = ProcessList.PERCEPTIBLE_APP_ADJ;
procState = ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND;
app.cached = false;
app.adjType = "force-fg";
app.adjSource = app.forcingToForeground;
schedGroup = Process.THREAD_GROUP_DEFAULT;
}
}
if (app == mHeavyWeightProcess) {
if (adj > ProcessList.HEAVY_WEIGHT_APP_ADJ) {
// We don't want to kill the current heavy-weight process.
adj = ProcessList.HEAVY_WEIGHT_APP_ADJ;
schedGroup = Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.cached = false;
app.adjType = "heavy";
}
if (procState > ActivityManager.PROCESS_STATE_HEAVY_WEIGHT) {
procState = ActivityManager.PROCESS_STATE_HEAVY_WEIGHT;
}
}
if (app == mHomeProcess) {
if (adj > ProcessList.HOME_APP_ADJ) {
// This process is hosting what we currently consider to be the
// home app, so we don't want to let it go into the background.
adj = ProcessList.HOME_APP_ADJ;
schedGroup = Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.cached = false;
app.adjType = "home";
}
if (procState > ActivityManager.PROCESS_STATE_HOME) {
procState = ActivityManager.PROCESS_STATE_HOME;
}
}
if (app == mPreviousProcess && app.activities.size() > 0) {
if (adj > ProcessList.PREVIOUS_APP_ADJ) {
// This was the previous process that showed UI to the user.
// We want to try to keep it around more aggressively, to give
// a good experience around switching between two apps.
adj = ProcessList.PREVIOUS_APP_ADJ;
schedGroup = Process.THREAD_GROUP_BG_NONINTERACTIVE;
app.cached = false;
app.adjType = "previous";
}
if (procState > ActivityManager.PROCESS_STATE_LAST_ACTIVITY) {
procState = ActivityManager.PROCESS_STATE_LAST_ACTIVITY;
}
}
if (false) Slog.i(TAG, "OOM " + app + ": initial adj=" + adj
+ " reason=" + app.adjType);
// By default, we use the computed adjustment. It may be changed if
// there are applications dependent on our services or providers, but
// this gives us a baseline and makes sure we don't get into an
// infinite recursion.
app.adjSeq = mAdjSeq;
app.curRawAdj = adj;
app.hasStartedServices = false;
if (mBackupTarget != null && app == mBackupTarget.app) {
// If possible we want to avoid killing apps while they're being backed up
if (adj > ProcessList.BACKUP_APP_ADJ) {
if (DEBUG_BACKUP) Slog.v(TAG_BACKUP, "oom BACKUP_APP_ADJ for " + app);
adj = ProcessList.BACKUP_APP_ADJ;
if (procState > ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND) {
procState = ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND;
}
app.adjType = "backup";
app.cached = false;
}
if (procState > ActivityManager.PROCESS_STATE_BACKUP) {
procState = ActivityManager.PROCESS_STATE_BACKUP;
}
}
boolean mayBeTop = false;
for (int is = app.services.size()-1;
is >= 0 && (adj > ProcessList.FOREGROUND_APP_ADJ
|| schedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE
|| procState > ActivityManager.PROCESS_STATE_TOP);
is--) {
ServiceRecord s = app.services.valueAt(is);
if (s.startRequested) {
app.hasStartedServices = true;
if (procState > ActivityManager.PROCESS_STATE_SERVICE) {
procState = ActivityManager.PROCESS_STATE_SERVICE;
}
if (app.hasShownUi && app != mHomeProcess) {
// If this process has shown some UI, let it immediately
// go to the LRU list because it may be pretty heavy with
// UI stuff. We'll tag it with a label just to help
// debug and understand what is going on.
if (adj > ProcessList.SERVICE_ADJ) {
app.adjType = "cch-started-ui-services";
}
} else {
if (now < (s.lastActivity + ActiveServices.MAX_SERVICE_INACTIVITY)) {
// This service has seen some activity within
// recent memory, so we will keep its process ahead
// of the background processes.
if (adj > ProcessList.SERVICE_ADJ) {
adj = ProcessList.SERVICE_ADJ;
app.adjType = "started-services";
app.cached = false;
}
}
// If we have let the service slide into the background
// state, still have some text describing what it is doing
// even though the service no longer has an impact.
if (adj > ProcessList.SERVICE_ADJ) {
app.adjType = "cch-started-services";
}
}
}
for (int conni = s.connections.size()-1;
conni >= 0 && (adj > ProcessList.FOREGROUND_APP_ADJ
|| schedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE
|| procState > ActivityManager.PROCESS_STATE_TOP);
conni--) {
ArrayList<ConnectionRecord> clist = s.connections.valueAt(conni);
for (int i = 0;
i < clist.size() && (adj > ProcessList.FOREGROUND_APP_ADJ
|| schedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE
|| procState > ActivityManager.PROCESS_STATE_TOP);
i++) {
// XXX should compute this based on the max of
// all connected clients.
ConnectionRecord cr = clist.get(i);
if (cr.binding.client == app) {
// Binding to ourself is not interesting.
continue;
}
if ((cr.flags&Context.BIND_WAIVE_PRIORITY) == 0) {
ProcessRecord client = cr.binding.client;
int clientAdj = computeOomAdjLocked(client, cachedAdj,
TOP_APP, doingAll, now);
int clientProcState = client.curProcState;
if (clientProcState >= ActivityManager.PROCESS_STATE_CACHED_ACTIVITY) {
// If the other app is cached for any reason, for purposes here
// we are going to consider it empty. The specific cached state
// doesn't propagate except under certain conditions.
clientProcState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
}
String adjType = null;
if ((cr.flags&Context.BIND_ALLOW_OOM_MANAGEMENT) != 0) {
// Not doing bind OOM management, so treat
// this guy more like a started service.
if (app.hasShownUi && app != mHomeProcess) {
// If this process has shown some UI, let it immediately
// go to the LRU list because it may be pretty heavy with
// UI stuff. We'll tag it with a label just to help
// debug and understand what is going on.
if (adj > clientAdj) {
adjType = "cch-bound-ui-services";
}
app.cached = false;
clientAdj = adj;
clientProcState = procState;
} else {
if (now >= (s.lastActivity
+ ActiveServices.MAX_SERVICE_INACTIVITY)) {
// This service has not seen activity within
// recent memory, so allow it to drop to the
// LRU list if there is no other reason to keep
// it around. We'll also tag it with a label just
// to help debug and undertand what is going on.
if (adj > clientAdj) {
adjType = "cch-bound-services";
}
clientAdj = adj;
}
}
}
if (adj > clientAdj) {
// If this process has recently shown UI, and
// the process that is binding to it is less
// important than being visible, then we don't
// care about the binding as much as we care
// about letting this process get into the LRU
// list to be killed and restarted if needed for
// memory.
if (app.hasShownUi && app != mHomeProcess
&& clientAdj > ProcessList.PERCEPTIBLE_APP_ADJ) {
adjType = "cch-bound-ui-services";
} else {
if ((cr.flags&(Context.BIND_ABOVE_CLIENT
|Context.BIND_IMPORTANT)) != 0) {
adj = clientAdj >= ProcessList.PERSISTENT_SERVICE_ADJ
? clientAdj : ProcessList.PERSISTENT_SERVICE_ADJ;
} else if ((cr.flags&Context.BIND_NOT_VISIBLE) != 0
&& clientAdj < ProcessList.PERCEPTIBLE_APP_ADJ
&& adj > ProcessList.PERCEPTIBLE_APP_ADJ) {
adj = ProcessList.PERCEPTIBLE_APP_ADJ;
} else if (clientAdj > ProcessList.VISIBLE_APP_ADJ) {
adj = clientAdj;
} else {
if (adj > ProcessList.VISIBLE_APP_ADJ) {
adj = ProcessList.VISIBLE_APP_ADJ;
}
}
if (!client.cached) {
app.cached = false;
}
adjType = "service";
}
}
if ((cr.flags&Context.BIND_NOT_FOREGROUND) == 0) {
if (client.curSchedGroup == Process.THREAD_GROUP_DEFAULT) {
schedGroup = Process.THREAD_GROUP_DEFAULT;
}
if (clientProcState <= ActivityManager.PROCESS_STATE_TOP) {
if (clientProcState == ActivityManager.PROCESS_STATE_TOP) {
// Special handling of clients who are in the top state.
// We *may* want to consider this process to be in the
// top state as well, but only if there is not another
// reason for it to be running. Being on the top is a
// special state, meaning you are specifically running
// for the current top app. If the process is already
// running in the background for some other reason, it
// is more important to continue considering it to be
// in the background state.
mayBeTop = true;
clientProcState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
} else {
// Special handling for above-top states (persistent
// processes). These should not bring the current process
// into the top state, since they are not on top. Instead
// give them the best state after that.
if ((cr.flags&Context.BIND_FOREGROUND_SERVICE) != 0) {
clientProcState =
ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
} else if (mWakefulness
== PowerManagerInternal.WAKEFULNESS_AWAKE &&
(cr.flags&Context.BIND_FOREGROUND_SERVICE_WHILE_AWAKE)
!= 0) {
clientProcState =
ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
} else {
clientProcState =
ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND;
}
}
}
} else {
if (clientProcState <
ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND) {
clientProcState =
ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND;
}
}
if (procState > clientProcState) {
procState = clientProcState;
}
if (procState < ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND
&& (cr.flags&Context.BIND_SHOWING_UI) != 0) {
app.pendingUiClean = true;
}
if (adjType != null) {
app.adjType = adjType;
app.adjTypeCode = ActivityManager.RunningAppProcessInfo
.REASON_SERVICE_IN_USE;
app.adjSource = cr.binding.client;
app.adjSourceProcState = clientProcState;
app.adjTarget = s.name;
}
}
if ((cr.flags&Context.BIND_TREAT_LIKE_ACTIVITY) != 0) {
app.treatLikeActivity = true;
}
final ActivityRecord a = cr.activity;
if ((cr.flags&Context.BIND_ADJUST_WITH_ACTIVITY) != 0) {
if (a != null && adj > ProcessList.FOREGROUND_APP_ADJ &&
(a.visible || a.state == ActivityState.RESUMED
|| a.state == ActivityState.PAUSING)) {
adj = ProcessList.FOREGROUND_APP_ADJ;
if ((cr.flags&Context.BIND_NOT_FOREGROUND) == 0) {
schedGroup = Process.THREAD_GROUP_DEFAULT;
}
app.cached = false;
app.adjType = "service";
app.adjTypeCode = ActivityManager.RunningAppProcessInfo
.REASON_SERVICE_IN_USE;
app.adjSource = a;
app.adjSourceProcState = procState;
app.adjTarget = s.name;
}
}
}
}
}
for (int provi = app.pubProviders.size()-1;
provi >= 0 && (adj > ProcessList.FOREGROUND_APP_ADJ
|| schedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE
|| procState > ActivityManager.PROCESS_STATE_TOP);
provi--) {
ContentProviderRecord cpr = app.pubProviders.valueAt(provi);
for (int i = cpr.connections.size()-1;
i >= 0 && (adj > ProcessList.FOREGROUND_APP_ADJ
|| schedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE
|| procState > ActivityManager.PROCESS_STATE_TOP);
i--) {
ContentProviderConnection conn = cpr.connections.get(i);
ProcessRecord client = conn.client;
if (client == app) {
// Being our own client is not interesting.
continue;
}
int clientAdj = computeOomAdjLocked(client, cachedAdj, TOP_APP, doingAll, now);
int clientProcState = client.curProcState;
if (clientProcState >= ActivityManager.PROCESS_STATE_CACHED_ACTIVITY) {
// If the other app is cached for any reason, for purposes here
// we are going to consider it empty.
clientProcState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
}
if (adj > clientAdj) {
if (app.hasShownUi && app != mHomeProcess
&& clientAdj > ProcessList.PERCEPTIBLE_APP_ADJ) {
app.adjType = "cch-ui-provider";
} else {
adj = clientAdj > ProcessList.FOREGROUND_APP_ADJ
? clientAdj : ProcessList.FOREGROUND_APP_ADJ;
app.adjType = "provider";
}
app.cached &= client.cached;
app.adjTypeCode = ActivityManager.RunningAppProcessInfo
.REASON_PROVIDER_IN_USE;
app.adjSource = client;
app.adjSourceProcState = clientProcState;
app.adjTarget = cpr.name;
}
if (clientProcState <= ActivityManager.PROCESS_STATE_TOP) {
if (clientProcState == ActivityManager.PROCESS_STATE_TOP) {
// Special handling of clients who are in the top state.
// We *may* want to consider this process to be in the
// top state as well, but only if there is not another
// reason for it to be running. Being on the top is a
// special state, meaning you are specifically running
// for the current top app. If the process is already
// running in the background for some other reason, it
// is more important to continue considering it to be
// in the background state.
mayBeTop = true;
clientProcState = ActivityManager.PROCESS_STATE_CACHED_EMPTY;
} else {
// Special handling for above-top states (persistent
// processes). These should not bring the current process
// into the top state, since they are not on top. Instead
// give them the best state after that.
clientProcState =
ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
}
}
if (procState > clientProcState) {
procState = clientProcState;
}
if (client.curSchedGroup == Process.THREAD_GROUP_DEFAULT) {
schedGroup = Process.THREAD_GROUP_DEFAULT;
}
}
// If the provider has external (non-framework) process
// dependencies, ensure that its adjustment is at least
// FOREGROUND_APP_ADJ.
if (cpr.hasExternalProcessHandles()) {
if (adj > ProcessList.FOREGROUND_APP_ADJ) {
adj = ProcessList.FOREGROUND_APP_ADJ;
schedGroup = Process.THREAD_GROUP_DEFAULT;
app.cached = false;
app.adjType = "provider";
app.adjTarget = cpr.name;
}
if (procState > ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND) {
procState = ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND;
}
}
}
if (mayBeTop && procState > ActivityManager.PROCESS_STATE_TOP) {
// A client of one of our services or providers is in the top state. We
// *may* want to be in the top state, but not if we are already running in
// the background for some other reason. For the decision here, we are going
// to pick out a few specific states that we want to remain in when a client
// is top (states that tend to be longer-term) and otherwise allow it to go
// to the top state.
switch (procState) {
case ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND:
case ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND:
case ActivityManager.PROCESS_STATE_SERVICE:
// These all are longer-term states, so pull them up to the top
// of the background states, but not all the way to the top state.
procState = ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
break;
default:
// Otherwise, top is a better choice, so take it.
procState = ActivityManager.PROCESS_STATE_TOP;
break;
}
}
if (procState >= ActivityManager.PROCESS_STATE_CACHED_EMPTY) {
if (app.hasClientActivities) {
// This is a cached process, but with client activities. Mark it so.
procState = ActivityManager.PROCESS_STATE_CACHED_ACTIVITY_CLIENT;
app.adjType = "cch-client-act";
} else if (app.treatLikeActivity) {
// This is a cached process, but somebody wants us to treat it like it has
// an activity, okay!
procState = ActivityManager.PROCESS_STATE_CACHED_ACTIVITY;
app.adjType = "cch-as-act";
}
}
if (adj == ProcessList.SERVICE_ADJ) {
if (doingAll) {
app.serviceb = mNewNumAServiceProcs > (mNumServiceProcs/3);
mNewNumServiceProcs++;
//Slog.i(TAG, "ADJ " + app + " serviceb=" + app.serviceb);
if (!app.serviceb) {
// This service isn't far enough down on the LRU list to
// normally be a B service, but if we are low on RAM and it
// is large we want to force it down since we would prefer to
// keep launcher over it.
if (mLastMemoryLevel > ProcessStats.ADJ_MEM_FACTOR_NORMAL
&& app.lastPss >= mProcessList.getCachedRestoreThresholdKb()) {
app.serviceHighRam = true;
app.serviceb = true;
//Slog.i(TAG, "ADJ " + app + " high ram!");
} else {
mNewNumAServiceProcs++;
//Slog.i(TAG, "ADJ " + app + " not high ram!");
}
} else {
app.serviceHighRam = false;
}
}
if (app.serviceb) {
adj = ProcessList.SERVICE_B_ADJ;
}
}
app.curRawAdj = adj;
//Slog.i(TAG, "OOM ADJ " + app + ": pid=" + app.pid +
// " adj=" + adj + " curAdj=" + app.curAdj + " maxAdj=" + app.maxAdj);
if (adj > app.maxAdj) {
adj = app.maxAdj;
if (app.maxAdj <= ProcessList.PERCEPTIBLE_APP_ADJ) {
schedGroup = Process.THREAD_GROUP_DEFAULT;
}
}
// Do final modification to adj. Everything we do between here and applying
// the final setAdj must be done in this function, because we will also use
// it when computing the final cached adj later. Note that we don't need to
// worry about this for max adj above, since max adj will always be used to
// keep it out of the cached vaues.
app.curAdj = app.modifyRawOomAdj(adj);
app.curSchedGroup = schedGroup;
app.curProcState = procState;
app.foregroundActivities = foregroundActivities;
return app.curRawAdj;
}
applyOomAdjLocked
private final boolean applyOomAdjLocked(ProcessRecord app, boolean doingAll, long now,
long nowElapsed) {
boolean success = true;
if (app.curRawAdj != app.setRawAdj) {
app.setRawAdj = app.curRawAdj;
}
int changes = 0;
if (app.curAdj != app.setAdj) {
ProcessList.setOomAdj(app.pid, app.info.uid, app.curAdj);
if (DEBUG_SWITCH || DEBUG_OOM_ADJ) Slog.v(TAG_OOM_ADJ,
"Set " + app.pid + " " + app.processName + " adj " + app.curAdj + ": "
+ app.adjType);
app.setAdj = app.curAdj;
}
if (app.setSchedGroup != app.curSchedGroup) {
app.setSchedGroup = app.curSchedGroup;
if (DEBUG_SWITCH || DEBUG_OOM_ADJ) Slog.v(TAG_OOM_ADJ,
"Setting process group of " + app.processName
+ " to " + app.curSchedGroup);
if (app.waitingToKill != null && app.curReceiver == null
&& app.setSchedGroup == Process.THREAD_GROUP_BG_NONINTERACTIVE) {
app.kill(app.waitingToKill, true);
success = false;
} else {
if (true) {
long oldId = Binder.clearCallingIdentity();
try {
Process.setProcessGroup(app.pid, app.curSchedGroup);
} catch (Exception e) {
Slog.w(TAG, "Failed setting process group of " + app.pid
+ " to " + app.curSchedGroup);
e.printStackTrace();
} finally {
Binder.restoreCallingIdentity(oldId);
}
} else {
if (app.thread != null) {
try {
app.thread.setSchedulingGroup(app.curSchedGroup);
} catch (RemoteException e) {
}
}
}
Process.setSwappiness(app.pid,
app.curSchedGroup <= Process.THREAD_GROUP_BG_NONINTERACTIVE);
}
}
if (app.repForegroundActivities != app.foregroundActivities) {
app.repForegroundActivities = app.foregroundActivities;
changes |= ProcessChangeItem.CHANGE_ACTIVITIES;
}
if (app.repProcState != app.curProcState) {
app.repProcState = app.curProcState;
changes |= ProcessChangeItem.CHANGE_PROCESS_STATE;
if (app.thread != null) {
try {
if (false) {
//RuntimeException h = new RuntimeException("here");
Slog.i(TAG, "Sending new process state " + app.repProcState
+ " to " + app /*, h*/);
}
app.thread.setProcessState(app.repProcState);
} catch (RemoteException e) {
}
}
}
if (app.setProcState == ActivityManager.PROCESS_STATE_NONEXISTENT
|| ProcessList.procStatesDifferForMem(app.curProcState, app.setProcState)) {
if (false && mTestPssMode && app.setProcState >= 0 && app.lastStateTime <= (now-200)) {
// Experimental code to more aggressively collect pss while
// running test... the problem is that this tends to collect
// the data right when a process is transitioning between process
// states, which well tend to give noisy data.
long start = SystemClock.uptimeMillis();
long pss = Debug.getPss(app.pid, mTmpLong, null);
recordPssSampleLocked(app, app.curProcState, pss, mTmpLong[0], now);
mPendingPssProcesses.remove(app);
Slog.i(TAG, "Recorded pss for " + app + " state " + app.setProcState
+ " to " + app.curProcState + ": "
+ (SystemClock.uptimeMillis()-start) + "ms");
}
app.lastStateTime = now;
app.nextPssTime = ProcessList.computeNextPssTime(app.curProcState, true,
mTestPssMode, isSleeping(), now);
if (DEBUG_PSS) Slog.d(TAG_PSS, "Process state change from "
+ ProcessList.makeProcStateString(app.setProcState) + " to "
+ ProcessList.makeProcStateString(app.curProcState) + " next pss in "
+ (app.nextPssTime-now) + ": " + app);
} else {
if (now > app.nextPssTime || (now > (app.lastPssTime+ProcessList.PSS_MAX_INTERVAL)
&& now > (app.lastStateTime+ProcessList.minTimeFromStateChange(
mTestPssMode)))) {
requestPssLocked(app, app.setProcState);
app.nextPssTime = ProcessList.computeNextPssTime(app.curProcState, false,
mTestPssMode, isSleeping(), now);
} else if (false && DEBUG_PSS) Slog.d(TAG_PSS,
"Not requesting PSS of " + app + ": next=" + (app.nextPssTime-now));
}
if (app.setProcState != app.curProcState) {
if (DEBUG_SWITCH || DEBUG_OOM_ADJ) Slog.v(TAG_OOM_ADJ,
"Proc state change of " + app.processName
+ " to " + app.curProcState);
boolean setImportant = app.setProcState < ActivityManager.PROCESS_STATE_SERVICE;
boolean curImportant = app.curProcState < ActivityManager.PROCESS_STATE_SERVICE;
if (setImportant && !curImportant) {
// This app is no longer something we consider important enough to allow to
// use arbitrary amounts of battery power. Note
// its current wake lock time to later know to kill it if
// it is not behaving well.
BatteryStatsImpl stats = mBatteryStatsService.getActiveStatistics();
synchronized (stats) {
app.lastWakeTime = stats.getProcessWakeTime(app.info.uid,
app.pid, nowElapsed);
}
app.lastCpuTime = app.curCpuTime;
}
// Inform UsageStats of important process state change
// Must be called before updating setProcState
maybeUpdateUsageStatsLocked(app, nowElapsed);
app.setProcState = app.curProcState;
if (app.setProcState >= ActivityManager.PROCESS_STATE_HOME) {
app.notCachedSinceIdle = false;
}
if (!doingAll) {
setProcessTrackerStateLocked(app, mProcessStats.getMemFactorLocked(), now);
} else {
app.procStateChanged = true;
}
} else if (app.reportedInteraction && (nowElapsed-app.interactionEventTime)
> USAGE_STATS_INTERACTION_INTERVAL) {
// For apps that sit around for a long time in the interactive state, we need
// to report this at least once a day so they don't go idle.
maybeUpdateUsageStatsLocked(app, nowElapsed);
}
if (changes != 0) {
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"Changes in " + app + ": " + changes);
int i = mPendingProcessChanges.size()-1;
ProcessChangeItem item = null;
while (i >= 0) {
item = mPendingProcessChanges.get(i);
if (item.pid == app.pid) {
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"Re-using existing item: " + item);
break;
}
i--;
}
if (i < 0) {
// No existing item in pending changes; need a new one.
final int NA = mAvailProcessChanges.size();
if (NA > 0) {
item = mAvailProcessChanges.remove(NA-1);
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"Retrieving available item: " + item);
} else {
item = new ProcessChangeItem();
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"Allocating new item: " + item);
}
item.changes = 0;
item.pid = app.pid;
item.uid = app.info.uid;
if (mPendingProcessChanges.size() == 0) {
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"*** Enqueueing dispatch processes changed!");
mUiHandler.obtainMessage(DISPATCH_PROCESSES_CHANGED).sendToTarget();
}
mPendingProcessChanges.add(item);
}
item.changes |= changes;
item.processState = app.repProcState;
item.foregroundActivities = app.repForegroundActivities;
if (DEBUG_PROCESS_OBSERVERS) Slog.i(TAG_PROCESS_OBSERVERS,
"Item " + Integer.toHexString(System.identityHashCode(item))
+ " " + app.toShortString() + ": changes=" + item.changes
+ " procState=" + item.processState
+ " foreground=" + item.foregroundActivities
+ " type=" + app.adjType + " source=" + app.adjSource
+ " target=" + app.adjTarget);
}
return success;
}
private final void enqueueUidChangeLocked(UidRecord uidRec, boolean gone) {
if (uidRec.pendingChange == null) {
if (mPendingUidChanges.size() == 0) {
if (DEBUG_UID_OBSERVERS) Slog.i(TAG_UID_OBSERVERS,
"*** Enqueueing dispatch uid changed!");
mUiHandler.obtainMessage(DISPATCH_UIDS_CHANGED_MSG).sendToTarget();
}
final int NA = mAvailUidChanges.size();
if (NA > 0) {
uidRec.pendingChange = mAvailUidChanges.remove(NA-1);
if (DEBUG_UID_OBSERVERS) Slog.i(TAG_UID_OBSERVERS,
"Retrieving available item: " + uidRec.pendingChange);
} else {
uidRec.pendingChange = new UidRecord.ChangeItem();
if (DEBUG_UID_OBSERVERS) Slog.i(TAG_UID_OBSERVERS,
"Allocating new item: " + uidRec.pendingChange);
}
uidRec.pendingChange.uidRecord = uidRec;
uidRec.pendingChange.uid = uidRec.uid;
mPendingUidChanges.add(uidRec.pendingChange);
}
uidRec.pendingChange.gone = gone;
uidRec.pendingChange.processState = uidRec.setProcState;
}
NEXT:http://www.jianshu.com/p/94d1cd553c44
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