Do you mean process with PID 0 is the one, which runs in the background and serves the request from userland and goes to cpu_idle() if nothing to run.

-kapil


On Tue, Feb 19, 2013 at 11:23 AM, Sengottuvelan S <sengottuvelan.s@gmail.com> wrote:
Kapil
 
It runs as Background process in the kernel memory (init-process). When system calls is coming from User space/Land, there will be context switch from user to kernel space happens. I think kernel main thread serving those system calls.

On Mon, Feb 18, 2013 at 9:20 PM, kapil agrawal <kapil.agrawal81@gmail.com> wrote:
Hi,

How the linux kernel runs in the system after spawning the init and mounting the root FS. 
Does it run as some background process ?
How it serves the system calls etc. ?

Regards
Kapil

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Regards,
S. Sengottuvelan.