Re: Communication between kernel and kernel module

[刘智猷 <liuzhiyou.cs@xxxxxxxxx>]

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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