实战-Android开机时间优化

开机时长是系统优化的重点，下面将从几个方面进行优化：

Uboot 阶段

缩减Uboot 阶段启动内容：

diff --git a/board/amlogic/configs/g12a_u202_v1.h b/board/amlogic/configs/g12a_u202_v1.h
index 4cb206c..aa4a9cb 100755
--- a/board/amlogic/configs/g12a_u202_v1.h
+++ b/board/amlogic/configs/g12a_u202_v1.h
@@ -151,7 +151,6 @@"get_bootloaderversion;" \"setenv bootargs ${initargs} ${fs_type} otg_device=${otg_device} reboot_mode_android=${reboot_mode_android} logo=${display_layer},loaded,${fb_addr} vout2=${outputmode2}, vout=${outputmode},enable panel_type=${panel_type} lcd_ctrl=${lcd_ctrl} hdmitx=${cecconfig},${colorattribute} hdmimode=${hdmimode} hdmichecksum=${hdmichecksum} dolby_vision_on=${dolby_vision_on} frac_rate_policy=${frac_rate_policy} hdmi_read_edid=${hdmi_read_edid} cvbsmode=${cvbsmode} osd_reverse=${osd_reverse} video_reverse=${video_reverse} irq_check_en=${Irq_check_en}  androidboot.selinux=${EnableSelinux} androidboot.firstboot=${firstboot} jtag=${jtag}; "\"setenv bootargs ${bootargs} androidboot.hardware=amlogic androidboot.bootloader=${bootloader_version} androidboot.build.expect.baseband=N/A;"\
-            "run cmdline_keys;"\"\0"\"switch_bootmode="\"get_rebootmode;"\
@@ -349,7 +348,6 @@"run bcb_cmd; "\"run factory_reset_poweroff_protect;"\"run upgrade_check;"\
-            "run bootcount_check;"\"run init_display;"\"run storeargs;"\"run upgrade_key;" \
--

Kernel 阶段

1.关闭Kernel 打印，quiet bootargs

diff --git a/board/amlogic/configs/g12a_u202_v1.h b/board/amlogic/configs/g12a_u202_v1.h
index 370638d..4cb206c 100755
--- a/board/amlogic/configs/g12a_u202_v1.h
+++ b/board/amlogic/configs/g12a_u202_v1.h
@@ -136,7 +136,7 @@"fs_type=""rootfstype=ramfs""\0"\"initargs="\"init=/init console=ttyS0,115200 no_console_suspend earlycon=aml-uart,0xff803000 "\
-                       "ramoops.pstore_en=1 ramoops.record_size=0x8000 ramoops.console_size=0x4000 raid=noautodetect "\
+                       "ramoops.pstore_en=1 ramoops.record_size=0x8000 ramoops.console_size=0x4000 raid=noautodetect quiet "\"\0"\"upgrade_check="\"echo upgrade_step=${upgrade_step}; "\

2.不启动不用的模块


diff --git a/arch/arm/configs/meson64_a32_defconfig b/arch/arm/configs/meson64_a32_defconfig
index a0964bf..5ee8f3f 100755
--- a/arch/arm/configs/meson64_a32_defconfig
+++ b/arch/arm/configs/meson64_a32_defconfig
@@ -285,7 +285,7 @@ CONFIG_AMLOGIC_VIDEOBUF_RESOURCE=yCONFIG_AMLOGIC_MEDIA_VIDEO=yCONFIG_AMLOGIC_MEDIA_VIDEOCAPTURE=yCONFIG_AMLOGIC_VOUT=y
-CONFIG_AMLOGIC_CVBS_OUTPUT=y
+#CONFIG_AMLOGIC_CVBS_OUTPUT=yCONFIG_AMLOGIC_WSS=yCONFIG_AMLOGIC_VDAC=yCONFIG_AMLOGIC_HDMITX=y
@@ -358,8 +358,8 @@ CONFIG_AMLOGIC_GX_SUSPEND=yCONFIG_AMLOGIC_LEGACY_EARLY_SUSPEND=yCONFIG_AMLOGIC_LED=yCONFIG_AMLOGIC_LED_SYS=y
-CONFIG_AMLOGIC_JTAG=y
-CONFIG_AMLOGIC_JTAG_MESON=y
+#CONFIG_AMLOGIC_JTAG=y
+#CONFIG_AMLOGIC_JTAG_MESON=yCONFIG_AMLOGIC_WDT=yCONFIG_AMLOGIC_WDT_MESON=yCONFIG_AMLOGIC_WDT_MESON_V3=y
@@ -367,7 +367,7 @@ CONFIG_AMLOGIC_ESM=yCONFIG_AMLOGIC_WIFI=yCONFIG_AMLOGIC_BT_DEVICE=yCONFIG_AMLOGIC_POWER=y
-CONFIG_AMLOGIC_PCIE=y
+#CONFIG_AMLOGIC_PCIE=yCONFIG_AMLOGIC_IRBLASTER_CORE=yCONFIG_AMLOGIC_IRBLASTER_MESON=yCONFIG_AMLOGIC_IRBLASTER_PROTOCOL=y
@@ -393,10 +393,10 @@ CONFIG_DEVTMPFS_MOUNT=yCONFIG_DMA_CMA=yCONFIG_CMA_SIZE_MBYTES=8CONFIG_CONNECTOR=y
-CONFIG_MTD=y
-CONFIG_MTD_CMDLINE_PARTS=y
-CONFIG_MTD_BLOCK=y
-CONFIG_MTD_OOPS=y
+#CONFIG_MTD=y
+#CONFIG_MTD_CMDLINE_PARTS=y
+#CONFIG_MTD_BLOCK=y
+#CONFIG_MTD_OOPS=y#CONFIG_MTD_NAND=y#CONFIG_MTD_SPI_NOR=y#CONFIG_MTD_UBI=y
@@ -591,7 +591,7 @@ CONFIG_FUSE_FS=yCONFIG_JOLIET=yCONFIG_ZISOFS=yCONFIG_UDF_FS=y
-CONFIG_MSDOS_FS=y
+#CONFIG_MSDOS_FS=yCONFIG_VFAT_FS=yCONFIG_EXFAT_FS=yCONFIG_NTFS_FS=y

根据实际需求，去除不需要的kernel 模块

目前来看，Kernel 这两部分的修改，效果比较明显。可以优化4-5s

Android 启动阶段

1.preloaded-classes & preloaded_drawables

diff --git a/config/preloaded-classes b/config/preloaded-classes
index 0014793..14bae46 100644
--- a/config/preloaded-classes
+++ b/config/preloaded-classes
@@ -1253,10 +1253,6 @@ android.hardware.ICameraService$Stubandroid.hardware.ICameraService$Stub$Proxyandroid.hardware.ICameraServiceListenerandroid.hardware.ICameraServiceListener$Stub
-android.hardware.Sensor
-android.hardware.SensorEvent
-android.hardware.SensorEventListener
-android.hardware.SensorManagerandroid.hardware.SerialManagerandroid.hardware.SerialPortandroid.hardware.SystemSensorManager
@@ -1887,52 +1883,6 @@ android.icu.util.UResourceBundleIteratorandroid.icu.util.UResourceTypeMismatchExceptionandroid.icu.util.VersionInfoandroid.inputmethodservice.SoftInputWindow
-android.location.Address
-android.location.Address$1
-android.location.BatchedLocationCallbackTransport
-android.location.BatchedLocationCallbackTransport$CallbackTransport
-android.location.Country$1
-android.location.CountryDetector
-android.location.Criteria$1
-android.location.Geocoder

diff --git a/core/res/res/values/arrays.xml b/core/res/res/values/arrays.xml
index f6a5787..50558ff 100644
--- a/core/res/res/values/arrays.xml
+++ b/core/res/res/values/arrays.xml
@@ -23,7 +23,7 @@the zygote process before it starts forking application processes. --><array name="preloaded_drawables"><item>@drawable/toast_frame</item>
-       <item>@drawable/btn_check_on_pressed_holo_light</item>
+<!--       <item>@drawable/btn_check_on_pressed_holo_light</item><item>@drawable/btn_check_on_pressed_holo_dark</item><item>@drawable/btn_check_on_holo_light</item><item>@drawable/btn_check_on_holo_dark</item>
@@ -64,7 +64,7 @@<item>@drawable/btn_radio_off_disabled_holo_light</item><item>@drawable/btn_radio_off_disabled_holo_dark</item><item>@drawable/btn_radio_off_disabled_focused_holo_light</item>
-       <item>@drawable/btn_radio_off_disabled_focused_holo_dark</item>
+       <item>@drawable/btn_radio_off_disabled_focused_holo_dark</item>--><item>@drawable/btn_default_pressed_holo_light</item><item>@drawable/btn_default_pressed_holo_dark</item><item>@drawable/btn_default_normal_holo_light</item>
@@ -77,7 +77,7 @@<item>@drawable/btn_default_disabled_focused_holo_dark</item><item>@drawable/btn_default_holo_dark</item><item>@drawable/btn_default_holo_light</item>
-       <item>@drawable/btn_star_off_normal_holo_light</item>
+       <!--<item>@drawable/btn_star_off_normal_holo_light</item><item>@drawable/btn_star_on_normal_holo_light</item><item>@drawable/btn_star_on_disabled_holo_light</item><item>@drawable/btn_star_off_disabled_holo_light</item>

2.SystemServer 不启动无关的service

diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 1880e9f..eecb9ed 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -796,10 +796,10 @@ public final class SystemServer {mSystemServiceManager.startService(TelecomLoaderService.class);traceEnd();-            traceBeginAndSlog("StartTelephonyRegistry");
-            telephonyRegistry = new TelephonyRegistry(context);
-            ServiceManager.addService("telephony.registry", telephonyRegistry);
-            traceEnd();
+//            traceBeginAndSlog("StartTelephonyRegistry");
+//            telephonyRegistry = new TelephonyRegistry(context);
+//            ServiceManager.addService("telephony.registry", telephonyRegistry);
+//            traceEnd();traceBeginAndSlog("StartEntropyMixer");mEntropyMixer = new EntropyMixer(context);
@@ -1061,9 +1061,9 @@ public final class SystemServer {traceEnd();}-            traceBeginAndSlog("StartClipboardService");
-            mSystemServiceManager.startService(ClipboardService.class);
-            traceEnd();
+//            traceBeginAndSlog("StartClipboardService");
+//            mSystemServiceManager.startService(ClipboardService.class);
+//            traceEnd();traceBeginAndSlog("StartNetworkManagementService");try {@@ -1273,15 +1273,15 @@ public final class SystemServer {traceEnd();}-            traceBeginAndSlog("StartWiredAccessoryManager");
-            try {-                // Listen for wired headset changes
-                inputManager.setWiredAccessoryCallbacks(
-                        new WiredAccessoryManager(context, inputManager));
-            } catch (Throwable e) {-                reportWtf("starting WiredAccessoryManager", e);
-            }
-            traceEnd();
+//            traceBeginAndSlog("StartWiredAccessoryManager");
+//            try {+//                // Listen for wired headset changes
+//                inputManager.setWiredAccessoryCallbacks(
+//                        new WiredAccessoryManager(context, inputManager));
+//            } catch (Throwable e) {+//                reportWtf("starting WiredAccessoryManager", e);
+//            }
+//            traceEnd();if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_MIDI)) {// Start MIDI Manager service
@@ -1508,11 +1508,11 @@ public final class SystemServer {}traceEnd();-            if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) {-                traceBeginAndSlog("StartFingerprintSensor");
-                mSystemServiceManager.startService(FingerprintService.class);
-                traceEnd();
-            }
+//            if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) {+//                traceBeginAndSlog("StartFingerprintSensor");
+//                mSystemServiceManager.startService(FingerprintService.class);
+//                traceEnd();
+//            }

3.Systemui
startServicesIfNeeded
减少config_systemUIServiceComponents 启动的服务
frameworks/base/packages/SystemUI/res/values/config.xml

string-array name="config_systemUIServiceComponents" translatable="false"><item>com.android.systemui.Dependency</item><item>com.android.systemui.util.NotificationChannels</item><item>com.android.systemui.statusbar.CommandQueue$CommandQueueStart</item><item>com.android.systemui.keyguard.KeyguardViewMediator</item><item>com.android.systemui.recents.Recents</item><item>com.android.systemui.volume.VolumeUI</item><item>com.android.systemui.stackdivider.Divider</item><item>com.android.systemui.SystemBars</item><item>com.android.systemui.usb.StorageNotification</item><item>com.android.systemui.power.PowerUI</item><item>com.android.systemui.media.RingtonePlayer</item><item>com.android.systemui.keyboard.KeyboardUI</item><item>com.android.systemui.pip.PipUI</item><item>com.android.systemui.shortcut.ShortcutKeyDispatcher</item><item>@string/config_systemUIVendorServiceComponent</item><item>com.android.systemui.util.leak.GarbageMonitor$Service</item><item>com.android.systemui.LatencyTester</item><item>com.android.systemui.globalactions.GlobalActionsComponent</item><item>com.android.systemui.ScreenDecorations</item><item>com.android.systemui.fingerprint.FingerprintDialogImpl</item><item>com.android.systemui.SliceBroadcastRelayHandler</item><item>com.android.systemui.funshion.gesture.GestureBarUI</item><item>com.android.systemui.funshion.floatball.FloatshortcutUI</item><item>com.android.systemui.funshion.eye.EyeShieldBarUI</item><item>com.android.systemui.funshion.micmute.MicMuteUI</item></string-array>

可根据实际需要进行裁剪

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实战-Android开机时间优化

Uboot 阶段

Kernel 阶段

Android 启动阶段

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