On Fri, 19 May 2006 Manjunath Naik wrote :
>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.
This is the Kernel Mode stack, which you are talking about. The kernel mode stack is represented by the union thread_union. this union contains the tHRead_info structure which contains a pointer to the task_struct.
This is how the process descriptor and the kernel mode stack are related.
Refer Chapter 3 of the book UTLK-3 by By Daniel P. Bovet, Marco Cesati
>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
>> >
Hope it helps
- Rohit
>>
>>
>>
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