Do not hold direct ref BatteryStatsImpl$Uid$Proc

BatteryStatsImpl can reset its collected data, including
removing a BatteryStatsImpl$Uid$Proc object. If a ProcessRecord
has a direct reference, then the battery stats for a process
will be recorded in an old Proc object and prevent GC, causing
a memory leak.

bug:11087238
Change-Id: I19a9cd9d8361c10446a8ebdd5c0860b56c442209

2 files changed, 10 insertions, 12 deletions

diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index fe83e9f..9201b1d 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -2149,7 +2149,8 @@ public final class ActivityManagerService extends ActivityManagerNative
                                 totalUTime += otherUTime;
                                 totalSTime += otherSTime;
                                 if (pr != null) {
-                                    BatteryStatsImpl.Uid.Proc ps = pr.batteryStats;
+                                    BatteryStatsImpl.Uid.Proc ps = bstats.getProcessStatsLocked(
+                                            st.name, st.pid);
                                     ps.addCpuTimeLocked(st.rel_utime-otherUTime,
                                             st.rel_stime-otherSTime);
                                     ps.addSpeedStepTimes(cpuSpeedTimes);
@@ -2769,10 +2770,10 @@ public final class ActivityManagerService extends ActivityManagerNative
                     app.processName, uid, uid, gids, debugFlags, mountExternal,
                     app.info.targetSdkVersion, app.info.seinfo, null);
 
-            BatteryStatsImpl bs = app.batteryStats.getBatteryStats();
+            BatteryStatsImpl bs = mBatteryStatsService.getActiveStatistics();
             synchronized (bs) {
                 if (bs.isOnBattery()) {
-                    app.batteryStats.incStartsLocked();
+                    bs.getProcessStatsLocked(app.uid, app.processName).incStartsLocked();
                 }
             }
 
@@ -8150,10 +8151,7 @@ public final class ActivityManagerService extends ActivityManagerNative
                 }
             }
         }
-        synchronized (stats) {
-            ps = stats.getProcessStatsLocked(info.uid, proc);
-        }
-        return new ProcessRecord(ps, info, proc, uid);
+        return new ProcessRecord(stats, info, proc, uid);
     }
 
     final ProcessRecord addAppLocked(ApplicationInfo info, boolean isolated) {
diff --git a/services/java/com/android/server/am/ProcessRecord.java b/services/java/com/android/server/am/ProcessRecord.java
index 187cd44..217a8d6 100644
--- a/services/java/com/android/server/am/ProcessRecord.java
+++ b/services/java/com/android/server/am/ProcessRecord.java
@@ -46,7 +46,7 @@ import java.util.ArrayList;
  * is currently running.
  */
 final class ProcessRecord {
-    final BatteryStatsImpl.Uid.Proc batteryStats; // where to collect runtime statistics
+    private final BatteryStatsImpl mBatteryStats; // where to collect runtime statistics
     final ApplicationInfo info; // all about the first app in the process
     final boolean isolated;     // true if this is a special isolated process
     final int uid;              // uid of process; may be different from 'info' if isolated
@@ -273,8 +273,8 @@ final class ProcessRecord {
         }
         if (!keeping) {
             long wtime;
-            synchronized (batteryStats.getBatteryStats()) {
-                wtime = batteryStats.getBatteryStats().getProcessWakeTime(info.uid,
+            synchronized (mBatteryStats) {
+                wtime = mBatteryStats.getProcessWakeTime(info.uid,
                         pid, SystemClock.elapsedRealtime());
             }
             long timeUsed = wtime - lastWakeTime;
@@ -359,9 +359,9 @@ final class ProcessRecord {
         }
     }
     
-    ProcessRecord(BatteryStatsImpl.Uid.Proc _batteryStats, ApplicationInfo _info,
+    ProcessRecord(BatteryStatsImpl _batteryStats, ApplicationInfo _info,
             String _processName, int _uid) {
-        batteryStats = _batteryStats;
+        mBatteryStats = _batteryStats;
         info = _info;
         isolated = _info.uid != _uid;
         uid = _uid;