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AI 148368: Decrease CPU usage by throttling touch events

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We are decreasing CPU usage at the cost of event latency. Events are queued up
  and released to the app at the specified rate. You can
  experiment with different values via:
  adb shell setprop windowsmgr.max_events_per_sec 35
  The new value is picked up when you let go and retouch the screen. No
  reboot needed.
  Also the following changes were made after profiling:
  - In WindowManagerService, limit the call to userActivity() when we
  have a flood touch events.
  - In PowerManagerService, skip checking of permission if the caller
  is system user.
  - In PowerManagerService, integrated the functionality of gatherState()
  into reactivateWakeLocksLocked(). They loop through the same data
  structure and are called back to back.
  BUG=1692771

Automated import of CL 148368
This commit is contained in:
Michael Chan
2009-05-06 10:27:36 -07:00
committed by The Android Open Source Project
parent dffbb4dbce
commit e96440fa15
2 changed files with 103 additions and 28 deletions
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47
services/java/com/android/server/PowerManagerService.java
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@@ -496,8 +496,10 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
}
public void acquireWakeLock(int flags, IBinder lock, String tag) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
int uid = Binder.getCallingUid();
if (uid != Process.myUid()) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
}
long ident = Binder.clearCallingIdentity();
try {
synchronized (mLocks) {
@@ -554,14 +556,14 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
// by the current state so we never turn it more on than
// it already is.
if ((wl.flags & PowerManager.ACQUIRE_CAUSES_WAKEUP) != 0) {
reactivateWakeLocksLocked();
int oldWakeLockState = mWakeLockState;
mWakeLockState = mLocks.reactivateScreenLocksLocked();
if (mSpew) {
Log.d(TAG, "wakeup here mUserState=0x" + Integer.toHexString(mUserState)
+ " mLocks.gatherState()=0x"
+ Integer.toHexString(mLocks.gatherState())
+ " mWakeLockState=0x" + Integer.toHexString(mWakeLockState));
+ " mWakeLockState=0x"
+ Integer.toHexString(mWakeLockState)
+ " previous wakeLockState=0x" + Integer.toHexString(oldWakeLockState));
}
mWakeLockState = mLocks.gatherState();
} else {
if (mSpew) {
Log.d(TAG, "here mUserState=0x" + Integer.toHexString(mUserState)
@@ -598,7 +600,10 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
}
public void releaseWakeLock(IBinder lock) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
int uid = Binder.getCallingUid();
if (uid != Process.myUid()) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
}
synchronized (mLocks) {
releaseWakeLockLocked(lock, false);
@@ -653,17 +658,6 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
}
}
private void reactivateWakeLocksLocked()
{
int N = mLocks.size();
for (int i=0; i<N; i++) {
WakeLock wl = mLocks.get(i);
if (isScreenLock(wl.flags)) {
mLocks.get(i).activated = true;
}
}
}
private class PokeLock implements IBinder.DeathRecipient
{
PokeLock(int p, IBinder b, String t) {
@@ -1752,8 +1746,7 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
Binder.restoreCallingIdentity(ident);
}
reactivateWakeLocksLocked();
mWakeLockState = mLocks.gatherState();
mWakeLockState = mLocks.reactivateScreenLocksLocked();
setPowerState(mUserState | mWakeLockState, noChangeLights, true);
setTimeoutLocked(time, SCREEN_BRIGHT);
}
@@ -1944,6 +1937,20 @@ class PowerManagerService extends IPowerManager.Stub implements LocalPowerManage
}
return result;
}
int reactivateScreenLocksLocked()
{
int result = 0;
int N = this.size();
for (int i=0; i<N; i++) {
WakeLock wl = this.get(i);
if (isScreenLock(wl.flags)) {
wl.activated = true;
result |= wl.minState;
}
}
return result;
}
}
void setPolicy(WindowManagerPolicy p) {