Backed out changeset 62ff4a66c1c6 (bug 1750878) for causing Btime failures CLOSED TREE

mobile/android/geckoview/src/main/java/org/mozilla/gecko/process/GeckoServiceChildProcess.java

@@ -6,6 +6,7 @@
 package org.mozilla.gecko.process;
 
 import android.app.Service;
+import android.content.ComponentCallbacks2;
 import android.content.Intent;
 import android.os.Binder;
 import android.os.Bundle;
@@ -26,11 +27,13 @@ import org.mozilla.gecko.util.ThreadUtils;
 
 public class GeckoServiceChildProcess extends Service {
   private static final String LOGTAG = "ServiceChildProcess";
+  // Allowed elapsed time between full GCs while under constant memory pressure
+  private static final long LOW_MEMORY_ONGOING_RESET_TIME_MS = 10000;
 
   private static IProcessManager sProcessManager;
   private static String sOwnerProcessId;
-  private final MemoryController mMemoryController = new MemoryController();
 
+  private long mLastLowMemoryNotificationTime = 0;
   // Makes sure we don't reuse this process
   private static boolean sCreateCalled;
 
@@ -191,16 +194,36 @@ public class GeckoServiceChildProcess extends Service {
 
   @Override
   public void onTrimMemory(final int level) {
-    mMemoryController.onTrimMemory(level);
+    Log.i(LOGTAG, "onTrimMemory(" + level + ")");
 
     // This is currently a no-op in Service, but let's future-proof.
     super.onTrimMemory(level);
-  }
 
-  @Override
-  public void onLowMemory() {
-    mMemoryController.onLowMemory();
-    super.onLowMemory();
+    if (level < ComponentCallbacks2.TRIM_MEMORY_BACKGROUND) {
+      // We're not currently interested in trim events for non-backgrounded processes.
+      return;
+    }
+
+    // See nsIMemory.idl for descriptions of the various arguments to the "memory-pressure"
+    // observer.
+    String observerArg = null;
+
+    final long currentNotificationTime = System.currentTimeMillis();
+    if (level >= ComponentCallbacks2.TRIM_MEMORY_COMPLETE
+        || (currentNotificationTime - mLastLowMemoryNotificationTime)
+            >= LOW_MEMORY_ONGOING_RESET_TIME_MS) {
+      // We do a full "low-memory" notification for both new and last-ditch onTrimMemory requests.
+      observerArg = "low-memory";
+      mLastLowMemoryNotificationTime = currentNotificationTime;
+    } else {
+      // If it has been less than ten seconds since the last time we sent a "low-memory"
+      // notification, we send a "low-memory-ongoing" notification instead.
+      // This prevents Gecko from re-doing full GC's repeatedly over and over in succession,
+      // as they are expensive and quickly result in diminishing returns.
+      observerArg = "low-memory-ongoing";
+    }
+
+    GeckoAppShell.notifyObservers("memory-pressure", observerArg);
   }
 
   /**

mobile/android/geckoview/src/main/java/org/mozilla/gecko/process/MemoryController.java

@@ -1,70 +0,0 @@
-package org.mozilla.gecko.process;
-
-import android.content.ComponentCallbacks2;
-import android.content.res.Configuration;
-import android.util.Log;
-import androidx.annotation.NonNull;
-import org.mozilla.gecko.GeckoAppShell;
-
-public class MemoryController implements ComponentCallbacks2 {
-  private static final String LOGTAG = "MemoryController";
-  private long mLastLowMemoryNotificationTime = 0;
-
-  // Allowed elapsed time between full GCs while under constant memory pressure
-  private static final long LOW_MEMORY_ONGOING_RESET_TIME_MS = 10000;
-
-  private static final int LOW = 0;
-  private static final int MODERATE = 1;
-  private static final int CRITICAL = 2;
-
-  private int memoryLevelFromTrim(final int level) {
-    if (level >= ComponentCallbacks2.TRIM_MEMORY_COMPLETE
-        || level == ComponentCallbacks2.TRIM_MEMORY_RUNNING_CRITICAL) {
-      return CRITICAL;
-    } else if (level >= ComponentCallbacks2.TRIM_MEMORY_BACKGROUND) {
-      return MODERATE;
-    }
-    return LOW;
-  }
-
-  public void onTrimMemory(final int level) {
-    Log.i(LOGTAG, "onTrimMemory(" + level + ")");
-    onMemoryNotification(memoryLevelFromTrim(level));
-  }
-
-  @Override
-  public void onConfigurationChanged(final @NonNull Configuration newConfig) {}
-
-  public void onLowMemory() {
-    Log.i(LOGTAG, "onLowMemory");
-    onMemoryNotification(CRITICAL);
-  }
-
-  private void onMemoryNotification(final int level) {
-    if (level == LOW) {
-      // The trim level is too low to be actionable
-      return;
-    }
-
-    // See nsIMemory.idl for descriptions of the various arguments to the "memory-pressure"
-    // observer.
-    final String observerArg;
-
-    final long currentNotificationTime = System.currentTimeMillis();
-    if (level == CRITICAL
-        || (currentNotificationTime - mLastLowMemoryNotificationTime)
-            >= LOW_MEMORY_ONGOING_RESET_TIME_MS) {
-      // We do a full "low-memory" notification for both new and last-ditch onTrimMemory requests.
-      observerArg = "low-memory";
-      mLastLowMemoryNotificationTime = currentNotificationTime;
-    } else {
-      // If it has been less than ten seconds since the last time we sent a "low-memory"
-      // notification, we send a "low-memory-ongoing" notification instead.
-      // This prevents Gecko from re-doing full GC's repeatedly over and over in succession,
-      // as they are expensive and quickly result in diminishing returns.
-      observerArg = "low-memory-ongoing";
-    }
-
-    GeckoAppShell.notifyObservers("memory-pressure", observerArg);
-  }
-}

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoRuntime.java

@@ -47,7 +47,6 @@ import org.mozilla.gecko.GeckoScreenOrientation.ScreenOrientation;
 import org.mozilla.gecko.GeckoSystemStateListener;
 import org.mozilla.gecko.GeckoThread;
 import org.mozilla.gecko.annotation.WrapForJNI;
-import org.mozilla.gecko.process.MemoryController;
 import org.mozilla.gecko.util.BundleEventListener;
 import org.mozilla.gecko.util.DebugConfig;
 import org.mozilla.gecko.util.EventCallback;
@@ -136,8 +135,6 @@ public final class GeckoRuntime implements Parcelable {
    */
   public static final String CRASHED_PROCESS_TYPE_BACKGROUND_CHILD = "BACKGROUND_CHILD";
 
-  private final MemoryController mMemoryController = new MemoryController();
-
   @Retention(RetentionPolicy.SOURCE)
   @StringDef(
       value = {
@@ -555,8 +552,6 @@ public final class GeckoRuntime implements Parcelable {
       throw new IllegalStateException("Failed to initialize GeckoRuntime");
     }
 
-    context.registerComponentCallbacks(runtime.mMemoryController);
-
     return runtime;
   }
 

mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/GeckoViewActivity.java

@@ -1387,7 +1387,6 @@ public class GeckoViewActivity extends AppCompatActivity
   private void loadFromIntent(final Intent intent) {
     final Uri uri = intent.getData();
     if (uri != null) {
-      createNewTab();
       mTabSessionManager
           .getCurrentSession()
           .load(