From 9d52f791b94bbf03739bdee4ccdd3ecb514c8eeb Mon Sep 17 00:00:00 2001
From: Dianne Hackborn <hackbod@google.com>
Date: Thu, 11 Sep 2014 17:46:06 -0700
Subject: [PATCH] Fix issue #17377423: Frequently see 500ms latency on app
 open...

...even for apps in cache

64 bit devices are cool, so they get to use more RAM for their
caches.

Shhhh, don't tell 32 bit devices, they get terribly jealous.

Change-Id: Iec9a0c43718a75530555bac50185658a682969aa
---
 .../java/com/android/server/am/ProcessList.java   | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/services/core/java/com/android/server/am/ProcessList.java b/services/core/java/com/android/server/am/ProcessList.java
index 1287dceda9ab2..80d0510043eaf 100644
--- a/services/core/java/com/android/server/am/ProcessList.java
+++ b/services/core/java/com/android/server/am/ProcessList.java
@@ -21,6 +21,7 @@ import java.io.OutputStream;
 import java.nio.ByteBuffer;
 
 import android.app.ActivityManager;
+import android.os.Build;
 import android.os.SystemClock;
 import com.android.internal.util.MemInfoReader;
 import com.android.server.wm.WindowManagerService;
@@ -230,21 +231,31 @@ final class ProcessList {
             Slog.i("XXXXXX", "minfree_adj=" + minfree_adj + " minfree_abs=" + minfree_abs);
         }
 
+        final boolean is64bit = Build.SUPPORTED_64_BIT_ABIS.length > 0;
+
         for (int i=0; i<mOomAdj.length; i++) {
             int low = mOomMinFreeLow[i];
             int high = mOomMinFreeHigh[i];
             mOomMinFree[i] = (int)(low + ((high-low)*scale));
+            if (is64bit) {
+                // On 64 bit devices, we consume more baseline RAM, because 64 bit is cool!
+                // To avoid being all pagey and stuff, scale up the memory levels to
+                // give us some breathing room.
+                mOomMinFree[i] = (3*mOomMinFree[i])/2;
+            }
         }
 
         if (minfree_abs >= 0) {
             for (int i=0; i<mOomAdj.length; i++) {
-                mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]);
+                mOomMinFree[i] = (int)((float)minfree_abs * mOomMinFree[i]
+                        / mOomMinFree[mOomAdj.length - 1]);
             }
         }
 
         if (minfree_adj != 0) {
             for (int i=0; i<mOomAdj.length; i++) {
-                mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i] / mOomMinFree[mOomAdj.length - 1]);
+                mOomMinFree[i] += (int)((float)minfree_adj * mOomMinFree[i]
+                        / mOomMinFree[mOomAdj.length - 1]);
                 if (mOomMinFree[i] < 0) {
                     mOomMinFree[i] = 0;
                 }