Fix issue #18683980: questions on LMK memory changes

Getting the denominator right is kind of important.

Change-Id: Iff02a0a95eccd1231042e4ea96011c8cee0fee02

services/core/java/com/android/server/am/ProcessList.java

@@ -238,7 +238,7 @@ final class ProcessList {
         if (Build.SUPPORTED_64_BIT_ABIS.length > 0) {
             // Increase the high min-free levels for cached processes for 64-bit
             mOomMinFreeHigh[4] = (mOomMinFreeHigh[4]*3)/2;
-            mOomMinFreeHigh[5] = (mOomMinFreeHigh[5]*7)/8;
+            mOomMinFreeHigh[5] = (mOomMinFreeHigh[5]*7)/4;
         }
 
         for (int i=0; i<mOomAdj.length; i++) {