In 2.6 this 8k space contains kernel stack at top and thread_info structure at bottom, in 2.4 it was stack and task_struct structure. Now in 2.6 thread_info is a compact structure (providing more space to kernel stack) which further contains pointer to task_struct structure in addition to some other info like preempt_count, exec_domain etc. This 8k space is represented by thread_union structure, please refer to the following links for more info. http://lxr.linux.no/source/include/linux/sched.h#L806 http://lxr.linux.no/source/include/asm-i386/thread_info.h#L100 Gaurav On 5/19/06, Manjunath Naik <peter.desouzain@xxxxxxxxx> 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. 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 > > > > > > **************************Disclaimer************************************ > Information contained in this E-MAIL being proprietary to Aftek Infosys Limited > is 'privileged' and 'confidential' and intended for use only by the individual > or entity to which it is addressed. You are notified that any use, copying > or dissemination of the information contained in the E-MAIL in any manner > whatsoever is strictly prohibited. > *************************************************************************** > http://www.aftek.com/ > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > >
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