How to get the information from /proc/files from within a kernel module?

[ravali pullela]

Thank you so much Valdis and Aruna. Probably, the problem was I tried to
search more on internet rather than kernel source and after 3 hours(I know
it is long), I understood that I am nowhere going in the right direction.

I have the mm_struct * with me. grepping is more useful.

Thanks again to all the people who are supporting kernel newbies :)


On Mon, Aug 25, 2014 at 10:12 PM, Aruna Hewapathirane <
aruna.hewapathirane at gmail.com> wrote:

> >> I want process related information like rss.(we can get this by doing
>> cat /proc/<pid>status) Is there a way to get this from >> within a kernel
>> module? I checked out the sources on /proc filesystem. They all show how to
>> create, read, write a new
>>
> >> proc file. But I want to read from an existing proc file specifically
>> /proc/<pid>/status
>>
>
> Have a look here: https://gist.github.com/Aruna-Hewapathirane
> /f41e7291e15bae6062a1 does exactly what your trying to do.
>
> >> Can anyone please point me to either resources or guide me to
>> accomplish the task of reading information from
>>
> >>/proc/files...
>>
>
> I would suggest you go through the source code for PS : http://procps.
> sourceforge.net/ and carefully study how things are done.
>
> This will also help: https://www.kernel.org/doc/Documentation/filesystems/
> proc.txt
>
> That being said I have to agree fully with Valdis the best way is always
> to grep through the kernel that way you get to see code that is being used
> and how things are done.
>
> With all due respect to all the more experienced and knowledgeable folks
> on the list I had great difficulty when I first started out accessing
> information and I have no wish to see anyone who is fascinated by the
> kernel and wants to mess with the internals be it for fun as a hobby to
> learn or for serious patching and contributing to the kernel walk away
> frustrated like I did so many times. ( I always walked right back though...
> :)
>
> Yes Valdis you can give me a hard time on IRC when I next show up :)
>
> Aruna ( Ravali, please heed Valdis's advice that is the best way. I just
> pointed you in the right direction with a bit more code to play with but
> try to do your own digging first through the kernel and good luck ! )
>
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