each process has an associated task_struct, which is used for process managament. to allocate this struct, the kernel allocates 2 pages (normally, but as mentioned, it can be only 1 page), which amounts to 8k, and places the task_struct at the bottom.
each time the host goes from user space to kernel space (interrupt, system call , etc...), these 2 pages are used for the kernel stack.
each time the host goes from user space to kernel space (interrupt, system call , etc...), these 2 pages are used for the kernel stack.
so, your module does not have a stack of it's own, but rather uses whats available at the time of it's execution - either the 2 pages as i mentioned, or the stack of a kernel thread which called it.
Source : http://kerneltrap.org/node/5416
On 5/18/06, abum@xxxxxxxxx <abum@xxxxxxxxx> wrote:
Yes. There is also a per process kernel stack maintained by ernel.
~Abu
> HI,
> I am a newbie to linux kernel. I wanted to know that for every process
> created in User Space
> there is a separate stack created .Wat about the kernel stack , is it
> separate for every process
>
> Thanks in advance,
> Zaheer
>
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