Various battery info things:

- Now track wake locks in battery history.
- Now track sensors in battery history.
- Some filtering of sensory data.
- Fixes to some data that wasn't cleared when resetting battery stats.
- Print amount discharged since last charge.

And the big part -- keep track of wake locks held per process,
and kill processes that hold wake locks too much while they are in
the background.  This includes information in the battery stats
about the process being killed, which will be available to the
developer if the app is reported.

Change-Id: I97202e94d00aafe0526ba2db74a03212e7539c54

services/java/com/android/server/PowerManagerService.java

@@ -151,6 +151,7 @@ class PowerManagerService extends IPowerManager.Stub
     static final int INITIAL_KEYBOARD_BRIGHTNESS = Power.BRIGHTNESS_OFF;
 
     private final int MY_UID;
+    private final int MY_PID;
 
     private boolean mDoneBooting = false;
     private boolean mBootCompleted = false;
@@ -309,7 +310,7 @@ class PowerManagerService extends IPowerManager.Stub
                 long ident = Binder.clearCallingIdentity();
                 try {
                     PowerManagerService.this.acquireWakeLockLocked(mFlags, mToken,
-                            MY_UID, mTag);
+                            MY_UID, MY_PID, mTag);
                     mHeld = true;
                 } finally {
                     Binder.restoreCallingIdentity(ident);
@@ -434,11 +435,11 @@ class PowerManagerService extends IPowerManager.Stub
         }
     }
 
-    PowerManagerService()
-    {
+    PowerManagerService() {
         // Hack to get our uid...  should have a func for this.
         long token = Binder.clearCallingIdentity();
-        MY_UID = Binder.getCallingUid();
+        MY_UID = Process.myUid();
+        MY_PID = Process.myPid();
         Binder.restoreCallingIdentity(token);
 
         // XXX remove this when the kernel doesn't timeout wake locks
@@ -573,13 +574,13 @@ class PowerManagerService extends IPowerManager.Stub
 
     private class WakeLock implements IBinder.DeathRecipient
     {
-        WakeLock(int f, IBinder b, String t, int u) {
+        WakeLock(int f, IBinder b, String t, int u, int p) {
             super();
             flags = f;
             binder = b;
             tag = t;
             uid = u == MY_UID ? Process.SYSTEM_UID : u;
-            pid = Binder.getCallingPid();
+            pid = p;
             if (u != MY_UID || (
                     !"KEEP_SCREEN_ON_FLAG".equals(tag)
                     && !"KeyInputQueue".equals(tag))) {
@@ -631,21 +632,23 @@ class PowerManagerService extends IPowerManager.Stub
 
     public void acquireWakeLock(int flags, IBinder lock, String tag) {
         int uid = Binder.getCallingUid();
+        int pid = Binder.getCallingPid();
         if (uid != Process.myUid()) {
             mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
         }
         long ident = Binder.clearCallingIdentity();
         try {
             synchronized (mLocks) {
-                acquireWakeLockLocked(flags, lock, uid, tag);
+                acquireWakeLockLocked(flags, lock, uid, pid, tag);
             }
         } finally {
             Binder.restoreCallingIdentity(ident);
         }
     }
 
-    public void acquireWakeLockLocked(int flags, IBinder lock, int uid, String tag) {
+    public void acquireWakeLockLocked(int flags, IBinder lock, int uid, int pid, String tag) {
         int acquireUid = -1;
+        int acquirePid = -1;
         String acquireName = null;
         int acquireType = -1;
 
@@ -657,7 +660,7 @@ class PowerManagerService extends IPowerManager.Stub
         WakeLock wl;
         boolean newlock;
         if (index < 0) {
-            wl = new WakeLock(flags, lock, tag, uid);
+            wl = new WakeLock(flags, lock, tag, uid, pid);
             switch (wl.flags & LOCK_MASK)
             {
                 case PowerManager.FULL_WAKE_LOCK:
@@ -730,13 +733,14 @@ class PowerManagerService extends IPowerManager.Stub
         }
         if (newlock) {
             acquireUid = wl.uid;
+            acquirePid = wl.pid;
             acquireName = wl.tag;
             acquireType = wl.monitorType;
         }
 
         if (acquireType >= 0) {
             try {
-                mBatteryStats.noteStartWakelock(acquireUid, acquireName, acquireType);
+                mBatteryStats.noteStartWakelock(acquireUid, acquirePid, acquireName, acquireType);
             } catch (RemoteException e) {
                 // Ignore
             }
@@ -756,6 +760,7 @@ class PowerManagerService extends IPowerManager.Stub
 
     private void releaseWakeLockLocked(IBinder lock, int flags, boolean death) {
         int releaseUid;
+        int releasePid;
         String releaseName;
         int releaseType;
 
@@ -800,13 +805,14 @@ class PowerManagerService extends IPowerManager.Stub
         // Unlink the lock from the binder.
         wl.binder.unlinkToDeath(wl, 0);
         releaseUid = wl.uid;
+        releasePid = wl.pid;
         releaseName = wl.tag;
         releaseType = wl.monitorType;
 
         if (releaseType >= 0) {
             long origId = Binder.clearCallingIdentity();
             try {
-                mBatteryStats.noteStopWakelock(releaseUid, releaseName, releaseType);
+                mBatteryStats.noteStopWakelock(releaseUid, releasePid, releaseName, releaseType);
             } catch (RemoteException e) {
                 // Ignore
             } finally {