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Commit c4f67aad authored by Bhargav Upperla's avatar Bhargav Upperla Committed by Linux Build Service Account
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Start Home Process as an empty app when killed by LMK. 

We maintain the empty app as a persistent process and keep it around
until we go back to home. Once we go back to home, the original
home app behavior persists.

Helps with back-to-home latencies, especially under memory pressure.

Change-Id: I447aeb4c84629c9e3b9d2d4b3095d2b3e43343dc
parent e7b6415c

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

+29 −0
Original line number Diff line number Diff line
@@ -522,6 +522,10 @@ public final class ActivityManagerService extends ActivityManagerNative 
    private static final int PERSISTENT_MASK =

            ApplicationInfo.FLAG_SYSTEM|ApplicationInfo.FLAG_PERSISTENT;













    // Start home process as an empty app













    private boolean mHomeKilled = false;













    private String mHomeProcessName = null;



























    // Intent sent when remote bugreport collection has been completed















    private static final String INTENT_REMOTE_BUGREPORT_FINISHED =















            "android.intent.action.REMOTE_BUGREPORT_FINISHED";










@@ -5176,7 +5180,12 @@ public final class ActivityManagerService extends ActivityManagerNative













                app.thread.asBinder() == thread.asBinder()) {















            boolean doLowMem = app.instrumentationClass == null;















            boolean doOomAdj = doLowMem;













            boolean homeRestart = false;















            if (!app.killedByAm) {













                if (mHomeProcessName != null && app.processName.equals(mHomeProcessName)) {













                    mHomeKilled = true;













                    homeRestart = true;













                }















                Slog.i(TAG, "Process " + app.processName + " (pid " + pid















                        + ") has died");















                mAllowLowerMemLevel = true;









@@ -5197,6 +5206,13 @@ public final class ActivityManagerService extends ActivityManagerNative













            if (doLowMem) {















                doLowMemReportIfNeededLocked(app);















            }













            if (mHomeKilled && homeRestart) {













                Intent intent = getHomeIntent();













                ActivityInfo aInfo = mStackSupervisor.resolveActivity(intent, null, 0, null, 0);













                startProcessLocked(aInfo.processName, aInfo.applicationInfo, true, 0,













                        "activity", null, false, false, true);













                homeRestart = false;













            }















        } else if (app.pid != pid) {















            // A new process has already been started.















            Slog.i(TAG, "Process " + app.processName + " (pid " + pid










@@ -16820,6 +16836,7 @@ public final class ActivityManagerService extends ActivityManagerNative













        mProcessesOnHold.remove(app);





























        if (app == mHomeProcess) {













            mHomeProcessName = mHomeProcess.processName;















            mHomeProcess = null;















        }















        if (app == mPreviousProcess) {










@@ -19104,6 +19121,10 @@ public final class ActivityManagerService extends ActivityManagerNative













            app.adjType = "top-activity";















            foregroundActivities = true;















            procState = PROCESS_STATE_CUR_TOP;













            if(app == mHomeProcess) {













                mHomeKilled = false;













                mHomeProcessName = mHomeProcess.processName;













            }















        } else if (app.instrumentationClass != null) {















            // Don't want to kill running instrumentation.















            adj = ProcessList.FOREGROUND_APP_ADJ;










@@ -19139,6 +19160,14 @@ public final class ActivityManagerService extends ActivityManagerNative













            app.cached = true;















            app.empty = true;















            app.adjType = "cch-empty";

























            if (mHomeKilled && app.processName.equals(mHomeProcessName)) {













                adj = ProcessList.PERSISTENT_PROC_ADJ;













                schedGroup = Process.THREAD_GROUP_DEFAULT;













                app.cached = false;













                app.empty = false;













                app.adjType = "top-activity";













            }















        }





























        // Examine all activities if not already foreground.