commit dbf8d27f4c32e20e132e90ad713c6ebaf71d7756
author Jeff Brown <jeffbrown@google.com> Fri Mar 18 18:14:26 2011 -0700
committer Jeff Brown <jeffbrown@android.com> Tue May 24 15:21:21 2011 -0700
tree a7dbe3db8501916c9b564c12bd997b59335c9182
parent 68d6075b4ad2205c10064c78cde552e3210cca91

Optimize EventHub to process events in big chunks. (DO NOT MERGE)

When 10 fingers are down, reduces the CPU time spent by the InputReader
thread from ~30% to ~5% on Stingray.

Change-Id: I42ee5c67b8521af715cbab43e763a4af4eb1f914

services/input/InputReader.h

diff --git a/services/input/InputReader.h b/services/input/InputReader.h
index fdb4cfc..cf9b13d 100644
--- a/services/input/InputReader.h
+++ b/services/input/InputReader.h
@@ -216,6 +216,10 @@
     virtual InputDispatcherInterface* getDispatcher() { return mDispatcher.get(); }
     virtual EventHubInterface* getEventHub() { return mEventHub.get(); }
 
+    // The event queue.
+    static const int EVENT_BUFFER_SIZE = 256;
+    RawEvent mEventBuffer[EVENT_BUFFER_SIZE];
+
     // This reader/writer lock guards the list of input devices.
     // The writer lock must be held whenever the list of input devices is modified
     //   and then promptly released.
@@ -228,16 +232,15 @@
     KeyedVector<int32_t, InputDevice*> mDevices;
 
     // low-level input event decoding and device management
-    void process(const RawEvent* rawEvent);
+    void processEvents(const RawEvent* rawEvents, size_t count);
 
     void addDevice(int32_t deviceId);
     void removeDevice(int32_t deviceId);
-    void configureExcludedDevices();
-
-    void consumeEvent(const RawEvent* rawEvent);
+    void processEventsForDevice(int32_t deviceId, const RawEvent* rawEvents, size_t count);
     void timeoutExpired(nsecs_t when);
 
     void handleConfigurationChanged(nsecs_t when);
+    void configureExcludedDevices();
 
     // state management for all devices
     Mutex mStateLock;
@@ -251,12 +254,12 @@
     InputConfiguration mInputConfiguration;
     void updateInputConfiguration();
 
-    nsecs_t mDisableVirtualKeysTimeout;
+    nsecs_t mDisableVirtualKeysTimeout; // only accessed by reader thread
     virtual void disableVirtualKeysUntil(nsecs_t time);
     virtual bool shouldDropVirtualKey(nsecs_t now,
             InputDevice* device, int32_t keyCode, int32_t scanCode);
 
-    nsecs_t mNextTimeout;
+    nsecs_t mNextTimeout; // only accessed by reader thread
     virtual void requestTimeoutAtTime(nsecs_t when);
 
     // state queries
@@ -301,7 +304,7 @@
     void addMapper(InputMapper* mapper);
     void configure();
     void reset();
-    void process(const RawEvent* rawEvent);
+    void process(const RawEvent* rawEvents, size_t count);
     void timeoutExpired(nsecs_t when);
 
     void getDeviceInfo(InputDeviceInfo* outDeviceInfo);