am: Allow more hidden apps on devices with lots of RAM

 * If more than 1.5GB is present, allow up to 40 hidden apps.
 * Number is somewhat arbitrary, but was found to work well on D2.
 * Also look at the sys.mem.max_hidden_apps value if given.

Change-Id: I2d3cf6e0dad1bc0b482cc37bf9c61ed2f2b4be52

1 files changed, 10 insertions, 1 deletions

diff --git a/services/java/com/android/server/am/ProcessList.java b/services/java/com/android/server/am/ProcessList.java
index 9e25e30..f76c660 100644
--- a/services/java/com/android/server/am/ProcessList.java
+++ b/services/java/com/android/server/am/ProcessList.java
@@ -23,6 +23,7 @@ import com.android.internal.util.MemInfoReader;
 import com.android.server.wm.WindowManagerService;
 
 import android.graphics.Point;
+import android.os.SystemProperties;
 import android.util.Slog;
 import android.view.Display;
 
@@ -101,7 +102,15 @@ class ProcessList {
     // The maximum number of hidden processes we will keep around before
     // killing them; this is just a control to not let us go too crazy with
     // keeping around processes on devices with large amounts of RAM.
-    static final int MAX_HIDDEN_APPS = 24;
+    static final int MAX_HIDDEN_APPS;
+
+    static {
+        // Allow more hidden apps on huge memory devices (1.5GB or higher)
+        // or fetch from the system property
+        MemInfoReader mi = new MemInfoReader();
+        MAX_HIDDEN_APPS = SystemProperties.getInt("sys.mem.max_hidden_apps",
+                mi.getTotalSize() > 1572864 ? 40 : 24);
+    }
 
     // We allow empty processes to stick around for at most 30 minutes.
     static final long MAX_EMPTY_TIME = 30*60*1000;