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这篇文章讲一下MTK8127开机启动的时间

MTK8127发布版本开机时间大约在２０秒左右，如果发现开机时间变长，大部分是因为加上了客户订制的东西，代码累赘太多了。

１、下面看一下ＭＴＫ开机花时间的是哪些动作

１－１　kernel初始化　

１－２　加载ＮＡＮＤ分区　

１－３　启动Android

　　　１－３－１　加载类　在zygote里面加了　时间发现　这个时间确实很长

　　　１－３－２　包扫描

　　　１－３－３　应用扫描

如何查看启动时间的相关时间点呢？看下面

root@mid713l_lp_lvds:/ # cat /proc/bootprof                                     ---------------------------------------- 0        BOOT PROF (unit:msec) ----------------------------------------       4098        : preloader        722        : lk       1829        : lk->Kernel ----------------------------------------       8743.419000 : Kernel_init_done       8758.075154 : SElinux start.      14921.341308 : SElinux end.      15750.858462 : INIT: on init start      16147.198077 : INIT:NAND:Mount_START      32627.899693 : INIT:NAND:Mount_END      32630.724232 : INIT:PROTECT:fat start      32733.226540 : INIT:PROTECT:fat end      32736.114693 : INIT:PROTECT_RAW_DISK:Mount_START      33582.732924 : INIT:PROTECT_RAW_DISK:Mount_END      34489.614386 : INIT: eng build setting      38913.817386 : BOOT_Animation:START      57958.511387 : Zygote:Preload Start      61800.738080 : Zygote:Preload 2774 classes in 3827ms      62764.249541 : Zygote:Preload 274 obtain resources in 941ms      62800.117541 : Zygote:Preload 31 resources in 35ms      62890.361695 : Zygote:Preload End      63355.167926 : Android:SysServerInit_START      64077.987388 : Android:PackageManagerService_Start      64640.584772 : Android:PMS_scan_START      70069.473157 : Android:PMS_scan_done:/custom/framework      70141.781234 : Android:PMS_scan_done:/system/framework      71685.662234 : Android:PMS_scan_done:/system/priv-app      75316.111234 : Android:PMS_scan_done:/system/app      75327.165004 : Android:PMS_scan_done:/system/vendor/app      75328.890158 : Android:PMS_scan_done:/system/vendor/operator/app      75330.559850 : Android:PMS_scan_done:/custom/app      75337.836927 : Android:PMS_scan_data_start      75418.824465 : Android:PMS_scan_data_done:/data/app      75420.457542 : Android:PMS_scan_data_done:/data/app-private      75422.520927 : Android:PMS_scan_END      75840.712234 : Android:PMS_READY      80126.832927 : AP_Init:[service]:[com.android.systemui]:[com.android.keyguard/.KeyguardService]:pid:809      82539.565158 : AP_Init:[service]:[com.mediatek.security]:[com.mediatek.security/.service.PermControlService]:pid:851      83699.413696 : AP_Init:[content provider]:[android.process.acore]:[com.android.providers.contacts/.ContactsProvider2]:pid:920      85690.594004 : AP_Init:[service]:[com.google.android.inputmethod.latin]:[com.google.android.inputmethod.latin/com.android.inputmethod.latin.La      87394.339466 : AP_Init:[broadcast]:[com.google.android.gms]:[com.google.android.gms/com.google.android.location.internal.NlpNetworkProviderSet      91038.825466 : AP_Init:[added application]:[com.android.phone]:[com.android.phone]:pid:990:(PersistAP)      91111.352389 : AP_Init:[added application]:[com.mediatek.voicecommand]:[com.mediatek.voicecommand]:pid:1003:(PersistAP)      91179.826158 : AP_Init:[added application]:[com.mediatek.bluetooth]:[com.mediatek.bluetooth]:pid:1018:(PersistAP)      91248.128928 : AP_Init:[added application]:[com.mediatek.dongle]:[com.mediatek.dongle]:pid:1036:(PersistAP)      91372.823851 : AP_Init:[activity]:[com.android.launcher3]:[com.android.launcher3/.Launcher]:pid:1052      91390.517158 : Android:SysServerInit_END      91448.375543 : AP_Init:[service]:[com.android.printspooler]:[com.android.printspooler/.PrintSpoolerService]:pid:1067      97597.181851 : AP_Init:[content provider]:[android.process.media]:[com.android.providers.downloads/.DownloadProvider]:pid:1100      97846.665697 : AP_Init:[content provider]:[com.google.process.gapps]:[com.google.android.gsf/.gservices.GservicesProvider]:pid:1119     103043.537698 : AP_Init:[broadcast]:[com.google.process.location]:[com.google.android.gms/com.google.android.location.network.LocationProviderC     108608.975006 : BOOT_Animation:END

２、再来看一下　各个阶段的时间　可以通过平板上显示的图标看出来

     16147.198077 : INIT:NAND:Mount_START

     32627.899693 : INIT:NAND:Mount_END

从这个日志看　NAND 挂载花了１６秒多　这个时间肯定要优化一下，要不然开机时间消耗太大

３、从日志分析时间

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