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From: liuzhiyou.cs@gmail.com (刘智猷)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Communication between kernel and kernel module
Date: Wed, 23 May 2012 09:07:31 +0800	[thread overview]
Message-ID: <4FBC3853.3000307@gmail.com> (raw)
In-Reply-To: <CAMmx0woDVmusLb3qNdqN=2Y4wfucwaaHeKMXuu9EpJMiBXU_Gw@mail.gmail.com>

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
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Regards,
LIU Zhiyou
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  parent reply	other threads:[~2012-05-23  1:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-22 18:18 Communication between kernel and kernel module drewd77.gm
2012-05-22 18:31 ` Vlad Dogaru
2012-05-23  1:07 ` 刘智猷 [this message]
2012-05-23 11:48 ` Frank Ch. Eigler

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