Communication between kernel and kernel module

[刘智猷]

Hi,
On 05/23/2012 02:18 AM, drewd77.gm wrote:
> Hi,
>
> Is there any way to call a function defined in a kernel module from 
> within the kernel proper?
>
> Here's what I'm trying to do:
>
> I'm trying to keep track of when and for how long a process is being 
> executed on the processor, i.e. I need to know when context switches 
> occur.
>
> There is a function called context_switch() 
> in linux/kernel/sched/core.c that is called whenever a context switch 
> happens. I would like to call a function in a kernel module I've 
> written from within context_switch() and pass some data to it.
There are lots of ways to do it, maybe you don't need to write a module 
or hacking the kernel like that... Check perf and systemtap. They may help.
>
> I've seen how to communicate between user space and kernel space, such 
> as using a file in /dev or using system calls, but not how to 
> communicate within the kernel itself.
>
> Regards,
> Drew
>
>
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Regards,
LIU Zhiyou
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