Merge "Add System Properties based settings for USAPs"

core/java/android/os/ZygoteProcess.java

@@ -81,13 +81,6 @@ public class ZygoteProcess {
 
     private static final String LOG_TAG = "ZygoteProcess";
 
-    /**
-     * The default value for enabling the unspecialized app process (USAP) pool.  This value will
-     * not be used if the devices has a DeviceConfig profile pushed to it that contains a value for
-     * this key.
-     */
-    private static final String USAP_POOL_ENABLED_DEFAULT = "false";
-
     /**
      * The name of the socket used to communicate with the primary zygote.
      */
@@ -793,14 +786,8 @@ public class ZygoteProcess {
     private boolean fetchUsapPoolEnabledProp() {
         boolean origVal = mUsapPoolEnabled;
 
-        final String propertyString = Zygote.getConfigurationProperty(
+        mUsapPoolEnabled = ZygoteConfig.getBool(
-                ZygoteConfig.USAP_POOL_ENABLED, USAP_POOL_ENABLED_DEFAULT);
+            ZygoteConfig.USAP_POOL_ENABLED, ZygoteConfig.USAP_POOL_ENABLED_DEFAULT);
-
-        if (!propertyString.isEmpty()) {
-            mUsapPoolEnabled = Zygote.getConfigurationPropertyBoolean(
-                  ZygoteConfig.USAP_POOL_ENABLED,
-                  Boolean.parseBoolean(USAP_POOL_ENABLED_DEFAULT));
-        }
 
         boolean valueChanged = origVal != mUsapPoolEnabled;
 

core/java/com/android/internal/os/ZygoteConfig.java

@@ -16,6 +16,9 @@
 
 package com.android.internal.os;
 
+import android.os.SystemProperties;
+import android.provider.DeviceConfig;
+
 /**
  * Flag names for configuring the zygote.
  *
@@ -26,15 +29,87 @@ public class ZygoteConfig {
     /** If {@code true}, enables the unspecialized app process (USAP) pool feature */
     public static final String USAP_POOL_ENABLED = "usap_pool_enabled";
 
+    /**
+     * The default value for enabling the unspecialized app process (USAP) pool.  This value will
+     * not be used if the devices has a DeviceConfig profile pushed to it that contains a value for
+     * this key or if the System Property dalvik.vm.usap_pool_enabled is set.
+     */
+    public static final boolean USAP_POOL_ENABLED_DEFAULT = false;
+
+
+
     /** The threshold used to determine if the pool should be refilled */
     public static final String USAP_POOL_REFILL_THRESHOLD = "usap_refill_threshold";
 
+    public static final int USAP_POOL_REFILL_THRESHOLD_DEFAULT = 1;
+
+
+
     /** The maximum number of processes to keep in the USAP pool */
     public static final String USAP_POOL_SIZE_MAX = "usap_pool_size_max";
 
+    public static final int USAP_POOL_SIZE_MAX_DEFAULT = 3;
+
+    /**
+     * The maximim value that will be accepted from the USAP_POOL_SIZE_MAX device property.
+     * is a mirror of USAP_POOL_MAX_LIMIT found in com_android_internal_os_Zygote.cpp.
+     */
+    public static final int USAP_POOL_SIZE_MAX_LIMIT = 100;
+
+
+
     /** The minimum number of processes to keep in the USAP pool */
     public static final String USAP_POOL_SIZE_MIN = "usap_pool_size_min";
 
+    public static final int USAP_POOL_SIZE_MIN_DEFAULT = 1;
+
+    /**
+     * The minimum value that will be accepted from the USAP_POOL_SIZE_MIN device property.
+     */
+    public static final int USAP_POOL_SIZE_MIN_LIMIT = 1;
+
+
+
     /** The number of milliseconds to delay before refilling the USAP pool */
     public static final String USAP_POOL_REFILL_DELAY_MS = "usap_pool_refill_delay_ms";
+
+    public static final int USAP_POOL_REFILL_DELAY_MS_DEFAULT = 3000;
+
+    public static final String PROPERTY_PREFIX_DEVICE_CONFIG = "persist.device_config";
+    public static final String PROPERTY_PREFIX_SYSTEM = "dalvik.vm.";
+
+    private static String getDeviceConfig(String name) {
+        return SystemProperties.get(
+            String.join(
+                ".",
+                PROPERTY_PREFIX_DEVICE_CONFIG,
+                DeviceConfig.NAMESPACE_RUNTIME_NATIVE,
+                name));
+    }
+
+    /**
+     * Get a property value from SystemProperties and convert it to an integer value.
+     */
+    public static int getInt(String name, int defaultValue) {
+        final String propString = getDeviceConfig(name);
+
+        if (!propString.isEmpty()) {
+            return Integer.parseInt(propString);
+        } else {
+            return SystemProperties.getInt(PROPERTY_PREFIX_SYSTEM + name, defaultValue);
+        }
+    }
+
+    /**
+     * Get a property value from SystemProperties and convert it to a Boolean value.
+     */
+    public static boolean getBool(String name, boolean defaultValue) {
+        final String propString = getDeviceConfig(name);
+
+        if (!propString.isEmpty()) {
+            return Boolean.parseBoolean(propString);
+        } else {
+            return SystemProperties.getBoolean(PROPERTY_PREFIX_SYSTEM + name, defaultValue);
+        }
+    }
 }

core/java/com/android/internal/os/ZygoteServer.java

@@ -49,26 +49,6 @@ class ZygoteServer {
     // TODO (chriswailes): Change this so it is set with Zygote or ZygoteSecondary as appropriate
     public static final String TAG = "ZygoteServer";
 
-    /**
-     * The maximim value that will be accepted from the USAP_POOL_SIZE_MAX device property.
-     * is a mirror of USAP_POOL_MAX_LIMIT found in com_android_internal_os_Zygote.cpp.
-     */
-    private static final int USAP_POOL_SIZE_MAX_LIMIT = 100;
-
-    /**
-     * The minimum value that will be accepted from the USAP_POOL_SIZE_MIN device property.
-     */
-    private static final int USAP_POOL_SIZE_MIN_LIMIT = 1;
-
-    /** The default value used for the USAP_POOL_SIZE_MAX device property */
-    private static final String USAP_POOL_SIZE_MAX_DEFAULT = "10";
-
-    /** The default value used for the USAP_POOL_SIZE_MIN device property */
-    private static final String USAP_POOL_SIZE_MIN_DEFAULT = "1";
-
-    /** The default value used for the USAP_REFILL_DELAY_MS device property */
-    private static final String USAP_POOL_REFILL_DELAY_MS_DEFAULT = "3000";
-
     /** The "not a timestamp" value for the refill delay timestamp mechanism. */
     private static final int INVALID_TIMESTAMP = -1;
 
@@ -264,46 +244,35 @@ class ZygoteServer {
 
     private void fetchUsapPoolPolicyProps() {
         if (mUsapPoolSupported) {
-            final String usapPoolSizeMaxPropString = Zygote.getConfigurationProperty(
+            mUsapPoolSizeMax = Integer.min(
-                    ZygoteConfig.USAP_POOL_SIZE_MAX, USAP_POOL_SIZE_MAX_DEFAULT);
+                ZygoteConfig.getInt(
+                    ZygoteConfig.USAP_POOL_SIZE_MAX,
+                    ZygoteConfig.USAP_POOL_SIZE_MAX_DEFAULT),
+                ZygoteConfig.USAP_POOL_SIZE_MAX_LIMIT);
 
-            if (!usapPoolSizeMaxPropString.isEmpty()) {
+            mUsapPoolSizeMin = Integer.max(
-                mUsapPoolSizeMax = Integer.min(Integer.parseInt(
+                ZygoteConfig.getInt(
-                        usapPoolSizeMaxPropString), USAP_POOL_SIZE_MAX_LIMIT);
+                    ZygoteConfig.USAP_POOL_SIZE_MIN,
-            }
+                    ZygoteConfig.USAP_POOL_SIZE_MIN_DEFAULT),
+                ZygoteConfig.USAP_POOL_SIZE_MIN_LIMIT);
 
-            final String usapPoolSizeMinPropString = Zygote.getConfigurationProperty(
+            mUsapPoolRefillThreshold = Integer.min(
-                    ZygoteConfig.USAP_POOL_SIZE_MIN, USAP_POOL_SIZE_MIN_DEFAULT);
+                ZygoteConfig.getInt(
-
-            if (!usapPoolSizeMinPropString.isEmpty()) {
-                mUsapPoolSizeMin = Integer.max(
-                        Integer.parseInt(usapPoolSizeMinPropString), USAP_POOL_SIZE_MIN_LIMIT);
-            }
-
-            final String usapPoolRefillThresholdPropString = Zygote.getConfigurationProperty(
                     ZygoteConfig.USAP_POOL_REFILL_THRESHOLD,
-                    Integer.toString(mUsapPoolSizeMax / 2));
+                    ZygoteConfig.USAP_POOL_REFILL_THRESHOLD_DEFAULT),
+                mUsapPoolSizeMax);
 
-            if (!usapPoolRefillThresholdPropString.isEmpty()) {
+            mUsapPoolRefillDelayMs = ZygoteConfig.getInt(
-                mUsapPoolRefillThreshold = Integer.min(
+                ZygoteConfig.USAP_POOL_REFILL_DELAY_MS,
-                        Integer.parseInt(usapPoolRefillThresholdPropString),
+                ZygoteConfig.USAP_POOL_REFILL_DELAY_MS_DEFAULT);
-                        mUsapPoolSizeMax);
-            }
-
-            final String usapPoolRefillDelayMsPropString = Zygote.getConfigurationProperty(
-                    ZygoteConfig.USAP_POOL_REFILL_DELAY_MS, USAP_POOL_REFILL_DELAY_MS_DEFAULT);
-
-            if (!usapPoolRefillDelayMsPropString.isEmpty()) {
-                mUsapPoolRefillDelayMs = Integer.parseInt(usapPoolRefillDelayMsPropString);
-            }
 
             // Validity check
             if (mUsapPoolSizeMin >= mUsapPoolSizeMax) {
                 Log.w(TAG, "The max size of the USAP pool must be greater than the minimum size."
                         + "  Restoring default values.");
 
-                mUsapPoolSizeMax = Integer.parseInt(USAP_POOL_SIZE_MAX_DEFAULT);
+                mUsapPoolSizeMax = ZygoteConfig.USAP_POOL_SIZE_MAX_DEFAULT;
-                mUsapPoolSizeMin = Integer.parseInt(USAP_POOL_SIZE_MIN_DEFAULT);
+                mUsapPoolSizeMin = ZygoteConfig.USAP_POOL_SIZE_MIN_DEFAULT;
                 mUsapPoolRefillThreshold = mUsapPoolSizeMax / 2;
             }
         }