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Commit e66a2bf2 authored by Nicolas Geoffray's avatar Nicolas Geoffray
Browse files

Workaround for USAP support in jitzygote. 

USAP improve app startup by ~5ms, so enable it for the
jitzygote experiment.

Bug: 119800099
Test: boots and usap processes live
Change-Id: I918d81f56cc7e9fcc8a053feadd7878108e6d590
parent 13e4ff16

core/java/android/os/ZygoteProcess.java

+13 −8
Original line number Diff line number Diff line
@@ -640,15 +640,10 @@ public class ZygoteProcess { 
                ZygoteConfig.USAP_POOL_ENABLED, USAP_POOL_ENABLED_DEFAULT);



        if (!propertyString.isEmpty()) {

            if (SystemProperties.get("dalvik.vm.boot-image", "").endsWith("apex.art")) {

                // TODO(b/119800099): Tweak usap configuration in jitzygote mode.

                mUsapPoolEnabled = false;

            } else {

            mUsapPoolEnabled = Zygote.getConfigurationPropertyBoolean(

                  ZygoteConfig.USAP_POOL_ENABLED,

                  Boolean.parseBoolean(USAP_POOL_ENABLED_DEFAULT));

        }

        }



        boolean valueChanged = origVal != mUsapPoolEnabled;
@@ -665,6 +660,16 @@ public class ZygoteProcess { 
    private boolean fetchUsapPoolEnabledPropWithMinInterval() {

        final long currentTimestamp = SystemClock.elapsedRealtime();



        if (SystemProperties.get("dalvik.vm.boot-image", "").endsWith("apex.art")) {

            // TODO(b/119800099): In jitzygote mode, we want to start using USAP processes

            // only once the boot classpath has been compiled. There is currently no callback

            // from the runtime to notify the zygote about end of compilation, so for now just

            // arbitrarily start USAP processes 15 seconds after boot.

            if (currentTimestamp <= 15000) {

                return false;

            }

        }



        if (mIsFirstPropCheck

                || (currentTimestamp - mLastPropCheckTimestamp >= Zygote.PROPERTY_CHECK_INTERVAL)) {

            mIsFirstPropCheck = false;