Memory change notifications

Memory change notifications

[Erlon Cruz]

Hi all,


I have a device driver that implements a mmap in a char device. I would like
to know if is possible to get notified(in that kernel module) every time a
process change its mapped memory. Does anyone know if so?

Regards,
Erlon
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Memory change notifications

[mindentropy]

>Hi all,


>I have a device driver that implements a mmap in a char device. I would like
>to know if is possible to get notified(in that kernel module) every time a
>process change its mapped memory. Does anyone know if so?

>Regards,
>Erlon

You would come to know from the mmap file operation right?

Memory change notifications

[mindentropy]

>I would like
>to know if is possible to get notified(in that kernel module) every time a
>process change its mapped memory.

I might have misread your question. If you are talking about mremap system 
call you would have to look at nopage method.

Memory change notifications

[Vladimir Murzin]

On Mon, Jul 18, 2011 at 10:36 PM, Erlon Cruz <sombrafam@gmail.com> wrote:
> Hi all,
>
> I have a device driver that implements a mmap in a char device. I would like
> to know if is possible to get?notified(in that kernel module) every time a
> process change its mapped memory. Does anyone know if so?
> Regards,
> Erlon
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
Hi Erlon,

I'm not sure but might be hardware watchpoints is what you need?

Memory change notifications

[Mulyadi Santosa]

Hi...

On Tue, Jul 19, 2011 at 01:36, Erlon Cruz <sombrafam@gmail.com> wrote:
> Hi all,
>
> I have a device driver that implements a mmap in a char device. I would like
> to know if is possible to get?notified(in that kernel module) every time a
> process change its mapped memory. Does anyone know if so?

hm, IMHO no, it doesn't know....unless your device send somekind of
"feedback" everytime it gets read. Or, I know it's dirty....mark the
related pages as read-only and intercept the fault? (would be not just
dirty, but awful I think...)

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

Memory change notifications

[Kaspter Ju]

Hi,

On Tue, Jul 19, 2011 at 2:36 AM, Erlon Cruz <sombrafam@gmail.com> wrote:
> Hi all,
>
> I have a device driver that implements a mmap in a char device. I would like
> to know if is possible to get?notified(in that kernel module) every time a
> process change its mapped memory. Does anyone know if so?

Maybe Deferred IO can help you.

http://lwn.net/Articles/259210/
http://lwn.net/Articles/223751/

-- 
Kaspter Ju