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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