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Commit 880721b3 authored by Alan Leung's avatar Alan Leung Committed by Jean-Philippe Lesot
Browse files

Enable boost-locked-region-priority 

Enable jack.transformations.boost-locked-region-priority compiler pass
that had shown to increase performance in AmSlam by 10% or so.

bug: 28610549
Change-Id: If1b76787acd272882647ede7e831cb1ba376e578
parent 005f9a73

services/core/Android.mk

+6 −0
Original line number Diff line number Diff line
@@ -24,4 +24,10 @@ ifneq ($(INCREMENTAL_BUILDS),) 
    LOCAL_JACK_ENABLED := incremental

endif



LOCAL_JACK_FLAGS := \

 -D jack.transformations.boost-locked-region-priority=true \

 -D jack.transformations.boost-locked-region-priority.classname=com.android.server.am.ActivityManagerService \

 -D jack.transformations.boost-locked-region-priority.request=com.android.server.am.ActivityManagerService\#boostPriorityForLockedSection \

 -D jack.transformations.boost-locked-region-priority.reset=com.android.server.am.ActivityManagerService\#resetPriorityAfterLockedSection



include $(BUILD_STATIC_JAVA_LIBRARY)

services/core/java/com/android/server/am/ActivityManagerService.java

+24 −0
Original line number Diff line number Diff line
@@ -628,6 +628,30 @@ public final class ActivityManagerService extends ActivityManagerNative 
        return mShowDialogs && !mSleeping && !mShuttingDown;

    }













    // it's a semaphore; boost when 0->1, reset when 1->0













    static ThreadLocal<Integer> sIsBoosted = new ThreadLocal<Integer>() {













        @Override protected Integer initialValue() {













            return 0;













        }













    };

























    static void boostPriorityForLockedSection() {













        if (sIsBoosted.get() == 0) {













            // boost to prio 118 while holding a global lock













            Process.setThreadPriority(Process.myTid(), -2);













            //Log.e(TAG, "PRIORITY BOOST:  set priority on TID " + Process.myTid());













        }













        int cur = sIsBoosted.get();













        sIsBoosted.set(cur + 1);













    }

























    static void resetPriorityAfterLockedSection() {













        sIsBoosted.set(sIsBoosted.get() - 1);













        if (sIsBoosted.get() == 0) {













            //Log.e(TAG, "PRIORITY BOOST:  reset priority on TID " + Process.myTid());













            Process.setThreadPriority(Process.myTid(), 0);













        }













    }















    public class PendingAssistExtras extends Binder implements Runnable {















        public final ActivityRecord activity;















        public final Bundle extras;