Linux Process Management

Linux Process Management(15) >             kernel thread. The interface for spawning a new kernel
>             thread from an existing one is: int kernel_thread (int
>             (*fn)(void *), void * arg, unsigned long flags) flags:
>             most kernel threads pass CLONE_FS CLONE_FILES
>             CLONE_SIGHAND
>   12. P.27 Process Termination
>          1. Typically, processes destruction occurs when the process
>             calls the exit() system call: exit() or return from main().
>          2. A process can also terminate when it receives a signal or
>             exception it cannot handle or ignore.
>          3. do_exit() in kernel complete a number of chores(in
>             kernel/exit.c):
>                1. Set the PF_EXITING flag in the flags member of the
>                   task_struct.
>                2. If BSD process accounting is enabled, call
>                   acct_process() to write out accounting information.
>                3. Call __exit__mm() to release the mm_struct held by