Defer broadcasts to slow-handling apps
When an app takes a long time to handle broadcasts, we start deferring
further broadcasts to it to make sure that other broadcast traffic in
the system can continue to make progress. Global delivery order is
technically rearranged, but delivery order from the point of view of any
given app remains consistent with issuance order.
When alarm broadcasts are issued, we prioritize delivery of deferred
alarms to the alarm recipients (i.e. we suspend the deferral policy and
catch up as promptly as possible) in order to minimize wake time spent
waiting for the alarm broadcast to be delivered. Once an app with a
deferred broadcast backlog is no longer the target of an in-flight
alarm, we re-impose deferral policy on it.
This policy intentionally trades off increased broadcast delivery
latency to apps that take a "long" time to handle broadcasts, in
exchange for lowering delivery latency to all other apps in the system
that would previously have had to wait behind the slow app.
In addition, broadcast dispatch policy parameters can now be overlaid
via the usual global Settings mechanism. In particular, configuring the
"bcast_slow_time" parameter to a value in milliseconds higher than the
queue's broadcast timeout period will disable the new slow-receiver
policies.
Bug: 111404343
Test: device boots & runs
Test: tests/ActivityTests
Change-Id: I76ac79bdf41ca3cfcc48515bca779ea0f5744c0b
diff --git a/core/java/android/app/IActivityManager.aidl b/core/java/android/app/IActivityManager.aidl
index fb65da1..412d7f4 100644
--- a/core/java/android/app/IActivityManager.aidl
+++ b/core/java/android/app/IActivityManager.aidl
@@ -277,6 +277,7 @@
void unstableProviderDied(in IBinder connection);
boolean isIntentSenderAnActivity(in IIntentSender sender);
boolean isIntentSenderAForegroundService(in IIntentSender sender);
+ boolean isIntentSenderABroadcast(in IIntentSender sender);
int startActivityAsUser(in IApplicationThread caller, in String callingPackage,
in Intent intent, in String resolvedType, in IBinder resultTo, in String resultWho,
int requestCode, int flags, in ProfilerInfo profilerInfo,
diff --git a/core/java/android/app/PendingIntent.java b/core/java/android/app/PendingIntent.java
index 75d95b2..55014eb 100644
--- a/core/java/android/app/PendingIntent.java
+++ b/core/java/android/app/PendingIntent.java
@@ -1113,6 +1113,19 @@
/**
* @hide
+ * Check whether this PendingIntent will launch an Activity.
+ */
+ public boolean isBroadcast() {
+ try {
+ return ActivityManager.getService()
+ .isIntentSenderABroadcast(mTarget);
+ } catch (RemoteException e) {
+ throw e.rethrowFromSystemServer();
+ }
+ }
+
+ /**
+ * @hide
* Return the Intent of this PendingIntent.
*/
@UnsupportedAppUsage
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 852b65a..6ff0171 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -11766,6 +11766,44 @@
public static final String SYNC_MANAGER_CONSTANTS = "sync_manager_constants";
/**
+ * Broadcast dispatch tuning parameters specific to foreground broadcasts.
+ *
+ * This is encoded as a key=value list, separated by commas. Ex: "foo=1,bar=true"
+ *
+ * The following keys are supported:
+ * <pre>
+ * bcast_timeout (long)
+ * bcast_slow_time (long)
+ * bcast_deferral (long)
+ * bcast_deferral_decay_factor (float)
+ * bcast_deferral_floor (long)
+ * </pre>
+ *
+ * @hide
+ */
+ public static final String BROADCAST_FG_CONSTANTS = "bcast_fg_constants";
+
+ /**
+ * Broadcast dispatch tuning parameters specific to background broadcasts.
+ *
+ * This is encoded as a key=value list, separated by commas. Ex: "foo=1,bar=true".
+ * See {@link #BROADCAST_FG_CONSTANTS} for the list of supported keys.
+ *
+ * @hide
+ */
+ public static final String BROADCAST_BG_CONSTANTS = "bcast_bg_constants";
+
+ /**
+ * Broadcast dispatch tuning parameters specific to specific "offline" broadcasts.
+ *
+ * This is encoded as a key=value list, separated by commas. Ex: "foo=1,bar=true".
+ * See {@link #BROADCAST_FG_CONSTANTS} for the list of supported keys.
+ *
+ * @hide
+ */
+ public static final String BROADCAST_OFFLOAD_CONSTANTS = "bcast_offload_constants";
+
+ /**
* Whether or not App Standby feature is enabled by system. This controls throttling of apps
* based on usage patterns and predictions. Platform will turn on this feature if both this
* flag and {@link #ADAPTIVE_BATTERY_MANAGEMENT_ENABLED} is on.
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index bd7f852..2a29f83 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -132,6 +132,9 @@
Settings.Global.AUTOMATIC_POWER_SAVER_MODE,
Settings.Global.BACKGROUND_ACTIVITY_STARTS_ENABLED,
Settings.Global.BATTERY_CHARGING_STATE_UPDATE_DELAY,
+ Settings.Global.BROADCAST_BG_CONSTANTS,
+ Settings.Global.BROADCAST_FG_CONSTANTS,
+ Settings.Global.BROADCAST_OFFLOAD_CONSTANTS,
Settings.Global.BATTERY_DISCHARGE_DURATION_THRESHOLD,
Settings.Global.BATTERY_DISCHARGE_THRESHOLD,
Settings.Global.BATTERY_SAVER_DEVICE_SPECIFIC_CONSTANTS,