Reduce persist threshold for lower warning/limit.

Default is 2MB persist threshold, but even that can be substantial
for devices on 100MB/month plans. This change gradually reduces the
persist threshold up to 8x lower (256kb outstanding) based on lowest
active policy.

Bug: 5382676
Change-Id: Ief4e8cdb169bfb151a3d1b45722a8eaa01926508

2 files changed, 6 insertions, 0 deletions

diff --git a/core/java/android/net/INetworkStatsService.aidl b/core/java/android/net/INetworkStatsService.aidl
index 08d4c6cbf4ab..b7b87318554c 100644
--- a/core/java/android/net/INetworkStatsService.aidl
+++ b/core/java/android/net/INetworkStatsService.aidl
@@ -42,5 +42,7 @@ interface INetworkStatsService {
     void setUidForeground(int uid, boolean uidForeground);
     /** Force update of statistics. */
     void forceUpdate();
+    /** Advise persistance threshold; may be overridden internally. */
+    void advisePersistThreshold(long thresholdBytes);
 
 }
diff --git a/core/java/android/util/MathUtils.java b/core/java/android/util/MathUtils.java
index b35dd1eac0de..13a692ea18c9 100644
--- a/core/java/android/util/MathUtils.java
+++ b/core/java/android/util/MathUtils.java
@@ -39,6 +39,10 @@ public final class MathUtils {
         return amount < low ? low : (amount > high ? high : amount);
     }
 
+    public static long constrain(long amount, long low, long high) {
+        return amount < low ? low : (amount > high ? high : amount);
+    }
+
     public static float constrain(float amount, float low, float high) {
         return amount < low ? low : (amount > high ? high : amount);
     }