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Commit 2d87e627 authored by Wessam Hassanein's avatar Wessam Hassanein Committed by Automerger Merge Worker
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Merge "Improve Transition GC initiation by improving the Frameworks triggering... 

Merge "Improve Transition GC initiation by improving the Frameworks triggering signal" am: 9c6a8eb6 am: 832afca2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2477849



Change-Id: Iea43fc9fae7e39e4c6efca6df244f7f4bd653a41
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents 65bd24f4 832afca2

core/java/android/app/ActivityThread.java

+15 −6
Original line number Diff line number Diff line
@@ -3430,8 +3430,13 @@ public final class ActivityThread extends ClientTransactionHandler 
            if (mLastProcessState == processState) {

                return;

            }

            mLastProcessState = processState;

            // Do not issue a transitional GC if we are transitioning between 2 cached states.

            // Only update if the state flips between cached and uncached or vice versa

            if (ActivityManager.isProcStateCached(mLastProcessState)

                    != ActivityManager.isProcStateCached(processState)) {

                updateVmProcessState(processState);

            }

            mLastProcessState = processState;

            if (localLOGV) {

                Slog.i(TAG, "******************* PROCESS STATE CHANGED TO: " + processState

                        + (fromIpc ? " (from ipc" : ""));
@@ -3440,12 +3445,16 @@ public final class ActivityThread extends ClientTransactionHandler 
    }



    /** Update VM state based on ActivityManager.PROCESS_STATE_* constants. */

    // Currently ART VM only uses state updates for Transitional GC, and thus

    // this function initiates a Transitional GC for transitions into Cached apps states.

    private void updateVmProcessState(int processState) {

        // TODO: Tune this since things like gmail sync are important background but not jank

        // perceptible.

        final int state = processState <= ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND

                ? VM_PROCESS_STATE_JANK_PERCEPTIBLE

                : VM_PROCESS_STATE_JANK_IMPERCEPTIBLE;

        // Only a transition into Cached state should result in a Transitional GC request

        // to the ART runtime. Update VM state to JANK_IMPERCEPTIBLE in that case.

        // Note that there are 4 possible cached states currently, all of which are

        // JANK_IMPERCEPTIBLE from GC point of view.

        final int state = ActivityManager.isProcStateCached(processState)

                ? VM_PROCESS_STATE_JANK_IMPERCEPTIBLE

                : VM_PROCESS_STATE_JANK_PERCEPTIBLE;

        VMRuntime.getRuntime().updateProcessState(state);

    }