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Commit 36e74a49 authored by Jahdiel Alvarez's avatar Jahdiel Alvarez
Browse files

Add criticalLowMemory trace to LowMemDetector 

Added a "criticalLowMemory" trace which tracks the duration of high
memory pressure state. When the native PSI monitor detects a memory PSI
event where the pressure state is ADJ_MEM_FACTOR_CRITICAL (highest
memory PSI level), we start tracing until the next PSI event is
detected.

Test: atest CtsAppTestCases:ActivityManagerTest
Bug: 306202359
Change-Id: I00acc9de180f3e65a9fe2cf84028a0c9eb66a008
parent a8c34f8d

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

+16 −1
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ import static com.android.internal.app.procstats.ProcessStats.ADJ_MEM_FACTOR_NOR 
import static com.android.internal.app.procstats.ProcessStats.ADJ_NOTHING;



import android.annotation.IntDef;

import android.os.Trace;



import com.android.internal.annotations.GuardedBy;
@@ -90,17 +91,31 @@ public final class LowMemDetector { 
    private native int waitForPressure();



    private final class LowMemThread extends Thread {

        private boolean mIsTracingMemCriticalLow;



        LowMemThread() {

            super("LowMemThread");

        }



        public void run() {



            while (true) {

                // sleep waiting for a PSI event

                int newPressureState = waitForPressure();

                // PSI event detected

                boolean isCriticalLowMemory = newPressureState == ADJ_MEM_FACTOR_CRITICAL;

                if (isCriticalLowMemory && !mIsTracingMemCriticalLow) {

                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "criticalLowMemory");

                } else if (!isCriticalLowMemory && mIsTracingMemCriticalLow) {

                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);

                }

                mIsTracingMemCriticalLow = isCriticalLowMemory;

                if (newPressureState == -1) {

                    // epoll broke, tear this down

                    mAvailable = false;

                    break;

                }

                // got a PSI event? let's update lowmem info

                // got an actual PSI event? let's update lowmem info

                synchronized (mPressureStateLock) {

                    mPressureState = newPressureState;

                }