检查过程中被杀的三个步骤 确定被杀过程的包名 有人直接用 百度搜索app对应的包名 确定被杀过程的准确时间点 如果有过程被杀的时间点和原因，直接使用 log中搜正则表达式（gedit支持正则）am_proc_died: [0,[0-9]*,xxxx,，xxxx代表包名 ，拿到这行log时间点和过程pid eg: 08-19 10:06:55.302 1000 1699 12137 I am_proc_died: [0,9307,com.quark.browser,905,11] 以上栗子为例:08-19 10:06:55.302 (搜索时可以减少几毫秒，否则可能无法同时搜索其他时间点log），进程pid为9307
检查过程中被杀的原因 在system log（logcat -v 下面）或event log（logcat -b events以下是搜索2中时间点附近对应pid的log 12-16 15:46:10.814 root 756 756 I Zygote : Process 9187 exited due to signal 11 (Segmentation fault) 12-16 15:46:10.830 1000 1747 2367 I ActivityManager: Process com.tencent.mm (pid 9187) has died: fg TOP 或搜索相应的包名ApplicationExitInfo ApplicationExitInfo #14: timestamp=2020-12-16 15:45:08.647 pid=6175 realUid=10249 packageUid=10249 definingUid=10249 user=0 process=com.tencent.mm reason=2 (SIGNALED) status=11 importance=100 pss=204MB rss=311MB description=null state=empty trace=null 常见的查杀类型 LowMemoryKiller(低内存查杀) 原因查找： 直接搜索lowmemorykiller: Kill ‘com.xxx.xxx’ (pid) 08-19 10:06:55.207 lmkd 954 954 E lowmemorykiller: Kill ‘com.quark.browser’ (9307), uid 10248, oom_adj 905 to free 69048kB 08-19 10:06:55.207 lmkd 954 954 I lowmemorykiller: Reclaimed 69048kB, cache(718372kB) and free(314436kB)-reserved(43892kB) below min(765000kB) for oom_adj 900 代表：手机cache 内存为718372kb，低于oom_adj 900最低值765000kB，所以lmkd会查杀pid为9307的com.quark.browser流程，当前流程adj905(高于900)释放69048kb
未有lowmemorykiller打印，但是am_low_memory递减同时，am_proc_died同时打印，且system log中有has died 打印 07-30 22:18:26.746 1000 1718 5108 I ActivityManager: Process com.xiaomi.channel (pid 21963) has died: hvy HVY 07-30 22:18:26.746 1000 1718 5127 I am_low_memory: 68 07-30 22:18:26.746 1000 1718 5108 I am_proc_died: [0,21963,com.xiaomi.channel,400,14] 07-30 22:18:26.803 1000 1718 5127 I am_low_memory: 66 代表：am_low_memory 后面的数字代表当前系统中的数字lru 数字递减代表在过程中被杀，has died 代表非AMS查杀（lmk查杀或信号查杀)，hvy HVY代表流程的优先级(流程自查清单)
看看手机内存状态和高内存应用程序 log中搜索 dumpsys meminfo，赋值粘贴如下信息jira上
内存状态信息 Total RAM: 5,510,720K (status normal) Free RAM: 1,092,011K ( 31,027K cached pss 938,028K cached kernel 864K cached ion 122,092K free) Used RAM: 5,982,010K (5,483,142K used pss 498,868K kernel) Lost RAM: 266,644K ZRAM: 462,104K physical used for 1,590,008K in swap (3,014,028K total swap) Tuning: 256 (large 512), oom 967,680K, restore limit 322,560K (high-end-gfx) --------- 9.460s was the duration of dumpsys meminfo, ending at: 2020-08-15 12:33:59 代表如下： 510、510、720手机总可用内存K Free的cache 内存为31,027K cached pss 主要用途是 5,483,142K 内存丢失：266，644K 这个值过大不正常
高优先级应用(占6位数): Total PSS by process: 509,265K: com.tencent.mm (pid 8448 / activities) ( 148,217K in swap) 315,084K: com.miui.miwallpaper.earth:earthSuperWallpaper (pid 4223) ( 42,026K in swap) 304,568K: system (pid 1699) ( 33,679K in swap) 295,422K: com.miui.home (pid 4283 / activities) ( 107,864K in swap) 258,716K: com.tencent.mm (pid 10718 / activities) ( 119,475K in swap) 195,761K: android.hardware.camera.provider@2.4-service_64 (pid 847) ( 194,356K in swap) 170,929K: com.tencent.mm:tools (pid 25205) ( 136K in swap) 170,385K: surfaceflinger (pid 956) ( 7,976K in swap) 163,051K: com.android.systemui (pid 4066) ( 61,983K in swap) 140,609K: com.xiaomi.smarthome (pid 10748) ( 75,044K in swap) 104,044K: com.tencent.mobileqq (pid 17557) ( 589K in swap) 正常查杀empty进程 08-10 13:32:13.057 1000 1700 1812 I am_kill : [0,2409,com.miui.screenrecorder,955,empty for 1800s] empty当过程数量达到阈值时，将查杀30min没有活跃的过程 08-10 16:00:54.244 1000 1700 1795 I ActivityManager: Killing 20081:com.android.providers.calendar/u0a72 (adj 985): empty #26 系统内empty当过程数量达到阈值26(不同的手机略有不同)时，按时间顺序程 客户端调用startInstrumentation，会先forceStopPackage再次拉起，可能会发现其他相关过程 08-03 15:10:02.933 1000 1303 12534 I ActivityManager: Force stopping com.eg.android.AlipayGphone appid=10198 user=0: start instr 08-03 15:10:02.933 1000 1303 12534 I ActivityManager: Killing 1441:com.kugou.android/u0a219 (adj 0): stop com.eg.android.AlipayGphone: start instr
退出过程 08-13 10:17:04.053 root 689 689 I Zygote : Process 29263 exited cleanly (0) 08-13 10:17:04.056 1000 1692 1805 I libprocessgroup: Successfully killed process cgroup uid 10252 pid 29263 in 122ms 08-13 10:17:03.933 1000 1692 5189 I ActivityManager: Process com.tencent.tmgp.pubgmhd (pid 29263) has died: hvy HVY
idle maint查杀 两次设备idle之间低内存状态持续时间超1/3,会查杀内存增长较高的进程，原生策略。 08-14 09:43:55.617 1000 1477 1779 I am_wtf : [0,1477,system_server,-1,ActivityManager,Killcom.tencent.mm in idle maint: pss=365677, swapPss=174343, initialPss=173858, period= 1h17m4s218ms, lowRamPeriod= 1h8m19s250ms] 08-14 09:4355.625 1000 1477 1477 I am_kill : [0,17579,com.byai.crm,100,idle maint (pss 165820 from 95133)] 08-14 09:43:55.772 1041 664 31875 I [30200] : 17579&10168&0&-1 08-14 09:43:55.724 1000 1477 1514 I am_proc_died: [0,17579,com.byai.crm,100,4]
installPackageLI/ deletePackageX等 只要是forceStopPackage接口查杀就有可能查杀到关联的进程，如下拨号就是因为与gms关联被杀
08-10 15:59:30.827 1000 1700 1812 I ActivityManager: Force stopping com.google.android.gms appid=10190 user=-1: installPackageLI 08-10 15:59:30.984 1000 1700 1812 I ActivityManager: Killing 3876:com.google.android.dialer/u0a180 (adj -700): stop com.google.android.gms: installPackageLI
过渡使用CPU 09-06 18:07:44.445 1000 1651 1798 I am_kill : [0,22157,com.ximalaya.ting.android,900,excessive cpu 16720 during 300044 dur=2221553 limit=2] 09-06 18:07:44.445 1000 1651 1798 I ActivityManager: Killing 22157:com.ximalaya.ting.android/u0a239 (adj 900): excessive cpu 16720 during 300044 dur=2221553 limit=2 09-06 18:07:44.566 root 681 681 I Zygote : Process 22157 exited due to signal 9 (Killed)
上次adj降为Service以下到现在经历2221553 ms，cpu POWER_CHECK_MAX_CPU_4 = 2, 两次检测时间间隔为300044 ms，使用cpu时间为16720ms，超过2%
进程的某个线程发生异常，自己发Signal 9信号给Zygote 杀掉自己 09-07 16:53:03.027 1000 2566 2582 I Process : Sending signal. PID: 2566 SIG: 9 09-07 16:53:03.154 root 681 681 I Zygote : Process 2566 exited due to signal 9 (Killed) 09-07 16:53:03.167 1000 1734 4006 I ActivityManager: Process com.android.systemui (pid 2566) has died: pers PER
某个app调用forceStopPackage 接口 03-25 19:34:10.498 26589 29585 I ActivityManager: Killing 14459:com.xiaomi.misubscreenui/1000 (adj 0): stop com.xiaomi.misubscreenui due to from process:com.miui.voiceassist ————————————————