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Commit 6b36e058 authored by Yi Kong's avatar Yi Kong
Browse files

profcollect: Trace on camera open events 

This allows us to collect traces for camera related libraries, like
libg3a. For the initial experiment, we collect the traces one second
after the camera opens. We can fine tune this or switch to other
triggers once we have the benchmark numbers.

Test: manual
Bug: 319394981
Change-Id: Ia65694602af1054dd261f4e72c1c3f82056eb1e3
parent dc2cfc8a

services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java

+35 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ import android.content.ComponentName; 
import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.hardware.camera2.CameraManager;

import android.os.Handler;

import android.os.IBinder.DeathRecipient;

import android.os.Looper;
@@ -258,6 +259,7 @@ public final class ProfcollectForwardingService extends SystemService { 
        BackgroundThread.get().getThreadHandler().post(

                () -> {

                    registerAppLaunchObserver();

                    registerCameraOpenObserver();

                    registerDex2oatObserver();

                    registerOTAObserver();

                });
@@ -371,4 +373,37 @@ public final class ProfcollectForwardingService extends SystemService { 
            pfs.getContext().sendBroadcast(intent);

        });

    }



    private void registerCameraOpenObserver() {

        CameraManager cm = getContext().getSystemService(CameraManager.class);

        cm.registerAvailabilityCallback(new CameraManager.AvailabilityCallback() {

            @Override

            public void onCameraOpened(String cameraId, String packageId) {

                Log.d(LOG_TAG, "Received camera open event from: " + packageId);

                // Skip face auth and Android System Intelligence, since they trigger way too

                // often.

                if (packageId.startsWith("client.pid")

                        || packageId.equals("com.google.android.as")) {

                    return;

                }

                // Sample for a fraction of camera events.

                final int traceFrequency =

                        DeviceConfig.getInt(DeviceConfig.NAMESPACE_PROFCOLLECT_NATIVE_BOOT,

                        "camera_trace_freq", 10);

                int randomNum = ThreadLocalRandom.current().nextInt(100);

                if (randomNum >= traceFrequency) {

                    return;

                }

                BackgroundThread.get().getThreadHandler().post(() -> {

                    try {

                        // Wait for a short time before starting tracing.

                        Thread.sleep(1000);

                        mIProfcollect.trace_once("camera");

                    } catch (RemoteException | InterruptedException e) {

                        Log.e(LOG_TAG, "Failed to initiate trace: " + e.getMessage());

                    }

                });

            }

        }, null);

    }

}