App hangs~

The app hangs

android How to analyze process killing

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Crash

tagNum	keyword	Parameter description	Brief description
30039	am_crash	(User|1|5),(PID|1|5),(Process Name|3),(Flags|1|5),(Exception|3),(Message|3),(File|3),(Line|1|5)	# Unhandled exception

ANR

tagNum	keyword	Parameter description	Brief description
30008	am_anr	(User|1|5),(pid|1|5),(Package Name|3),(Flags|1|5),(reason|3)	# Application Not Responding

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am_proc_died

tagNum	keyword	Parameter description	Brief description
30011	am_proc_died	(User|1|5),(PID|1|5),(Process Name|3),(OomAdj|1|5),(ProcState|1|5)	# Application process died
30023	am_kill	(User|1|5),(PID|1|5),(Process Name|3),(OomAdj|1|5),(Reason|3)	# Kill a process to reclaim memory.

frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
frameworks/base/services/core/java/com/android/server/am/ProcessRecord.java
frameworks/base/core/java/android/app/ApplicationExitInfo.java

• The above is obvious crash、anr, relevant ApplicationExitInfo.REASON_ANR、ApplicationExitInfo.REASON_CRASH
  
• Sometimes it's just am_proc_died and wm_finish_activity

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Case study

crash\anr

Low memory killing （LowMemoryKiller）

CPU High occupancy

am_kill : [0,22157,com.ximalaya.ting.android,900,excessive cpu 16720 during 300044 dur=2221553 limit=2]
ActivityManager: Killing 22157:com.ximalaya.ting.android/u0a239 (adj 900): excessive cpu 16720 during 300044 dur=2221553 limit=2
Zygote : Process 22157 exited due to signal 9 (Killed)

The process exits itself

Normal killing

installPackageLI/ deletePackageX And so on

Signal 9 commit suicide

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