开机优化

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system/core/logd/LogBuffer.cpp
int get_log_level() {
    char buf[PROPERTY_VALUE_MAX];
    memset(buf, 0, PROPERTY_VALUE_MAX);
    property_get("persist.xxx.level", buf, "");
    return buf[0];
}
​
int loglevl = get_log_level();
  
int LogBuffer::log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
                   pid_t tid, const char* msg, uint16_t len) {
    if (log_id >= LOG_ID_MAX) {
        return -EINVAL;
    }
     
    // 通过属性控制log输出
     if (length > 0 && loglevl < log_id) {
        return -EINVAL;
    }
​
}

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# Mount filesystems and start core system services.
on late-init
    trigger early-fs

    # Mount fstab in init.{$device}.rc by mount_all command. Optional parameter
    # '--early' can be specified to skip entries with 'latemount'.
    # /system and /vendor must be mounted by the end of the fs stage,
    # while /data is optional.
    trigger fs
    trigger post-fs

    # Mount fstab in init.{$device}.rc by mount_all with '--late' parameter
    # to only mount entries with 'latemount'. This is needed if '--early' is
    # specified in the previous mount_all command on the fs stage.
    # With /system mounted and properties form /system + /factory available,
    # some services can be started.
    trigger late-fs

    # Now we can mount /data. File encryption requires keymaster to decrypt
    # /data, which in turn can only be loaded when system properties are present.
    trigger post-fs-data

    # Load persist properties and override properties (if enabled) from /data.
    trigger load_persist_props_action

    # Should be before netd, but after apex, properties and logging is available.
    trigger load_bpf_programs

    # Now we can start zygote for devices with file based encryption
    # 触发zygote启动
    trigger zygote-start

    # Remove a file to wake up anything waiting for firmware.
    trigger firmware_mounts_complete

    trigger early-boot
    trigger boot

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parallel_restorecon enable

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on early-init
    write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor performance
    
# 查看当前频率
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

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on property:sys.boot_completed=1 write /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor schedutil

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on post-fs-data
    insmod /vendor/lib/modules/cimax-usb.ko
    insmod /vendor/lib/modules/ci.ko

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// 放在early-boot或者boot阶段执行 
on boot 
	start xxx 
service xxx /system/bin/xxx 
	user root 
	group system

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service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server --enable-lazy-preload

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service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server --enable-lazy-preload
    class main
    priority -20
    user root
    group root readproc reserved_disk
    socket zygote stream 660 root system
    socket usap_pool_primary stream 660 root system
    onrestart exec_background - system system -- /system/bin/vdc volume abort_fuse
    onrestart write /sys/power/state on
    onrestart restart audioserver
    onrestart restart cameraserver
    onrestart restart media
    onrestart restart netd
    onrestart restart wificond
    task_profiles ProcessCapacityHigh MaxPerformance

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// 生物识别
android.hardware.biometrics

// 人脸识别
android.hardware.face

// 打印服务
android.hardware.fingerprint
android.print.

// 部分定位相关, 还有GPS定位相关
android.hardware.location
com.android.internal.location.GpsNetInitiatedHandler
android.location.Gnss*

// 手机通话相关
android.telephony.
android.telecom.
com.android.i18n.phonenumbers.
com.android.ims
android.hardware.radio

// nfc相关
android.nfc.

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/** Turn off the verifier. */
public static final int DISABLE_VERIFIER = 1 << 9;

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 parsedArgs.mRuntimeFlags |= Zygote.DISABLE_VERIFIER;
            /* Request to fork the system server process */
            pid = Zygote.forkSystemServer(
                    parsedArgs.mUid, parsedArgs.mGid,
                    parsedArgs.mGids,
                    parsedArgs.mRuntimeFlags,
                    null,
                    parsedArgs.mPermittedCapabilities,
                    parsedArgs.mEffectiveCapabilities);

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android.os.Process.setThreadPriority(-19);
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_FOREGROUND);
Process.setProcessGroup(pid, Process.THREAD_GROUP_TOP_APP);

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private void run() {
    android.os.Process.setThreadPriority(-19);
    int defaultGroup = getProcessGroup(Process.myPid());
    Process.setProcessGroup(Process.myPid(), Process.THREAD_GROUP_TOP_APP);
    
    // Start services.
    try {
        t.traceBegin("StartServices");
        startBootstrapServices(t);
        startCoreServices(t);
        startOtherServices(t);
    } catch (Throwable ex) {
        Slog.e("System", "******************************************");
        Slog.e("System", "************ Failure starting system services", ex);
        throw ex;
    } finally {
        t.traceEnd(); // StartServices
    }

    android.os.Process.setThreadPriority(
        android.os.Process.THREAD_PRIORITY_FOREGROUND);
    Process.setProcessGroup(Process.myPid(), defaultGroup);
    // Loop forever.
    Looper.loop();

}

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private SystemServerInitThreadPool() {
    final int size = Runtime.getRuntime().availableProcessors();
    Slog.i(TAG, "Creating instance with " + size + " threads");
    mService = ConcurrentUtils.newFixedThreadPool(size,
    	"system-server-init-thread", -18);//Process.THREAD_PRIORITY_FOREGROUND);
}

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if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_xxx)) { mSystemServiceManager.startService(xxx_SERVICE_CLASS); }

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TelecomLoaderService
TelephonyRegistry
StatusBarManagerService
SearchManagerService
SerialService
FingerprintService
CameraService
MmsService

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void startPersistentApps(int matchFlags) {
    if (mFactoryTest == FactoryTest.FACTORY_TEST_LOW_LEVEL) return;

    synchronized (this) {
        try {
            final List<ApplicationInfo> apps = AppGlobals.getPackageManager()
                    .getPersistentApplications(STOCK_PM_FLAGS | matchFlags).getList();
            for (ApplicationInfo app : apps) {
                if (!"android".equals(app.packageName)) {
                    mHandler.postDelayed(() -> {
                        addAppLocked(app, null, false, null /* ABI override */,
                                ZYGOTE_POLICY_FLAG_BATCH_LAUNCH);
                    }, 1000);
                }
            }
        } catch (RemoteException ex) {
        }
    }
}

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LOCAL_DEX_PREOPT_FLAGS += --compiler-filter=speed-profile // debug pm compile -m speed -f package dumpsys package package