Re: /proc/cpuinfo format - arch dependent!

[Grzegorz Kulewski <kangur@polcom.net>]

On Tue, 19 Apr 2005, Nico Schottelius wrote:

> Lee Revell [Tue, Apr 19, 2005 at 04:42:12PM -0400]:
>> On Tue, 2005-04-19 at 22:00 +0200, Nico Schottelius wrote:
>>> Can you tell me which ones?
>>>
>>
>> Multimedia apps like JACK and mplayer that use the TSC for high res
>> timing need to know the CPU speed, and /proc/cpuinfo is the fast way to
>> get it.
>>
>> Why don't you create sysfs entries instead?  It would be better to have
>> all the cpuinfo contents as one value per file anyway (faster
>> application startup).
>
> Well, sounds very good. It's a chance for me to learn to program
> sysfs and also to create something useful.
>
> So the right location to place that data would be
> /sys/devices/system/cpu/cpuX?

IIRC there was such patch not very long ago and it was rejected (to not 
make kernel larger or something like that...). But I can be wrong.

I think that all data from /proc that are not user-process data should be 
exported using sysfs or something similar. Maybe even in future one will 
write userspace fs (using FUSE?) to emulate old /proc entries using sysfs 
exported data. This will allow removing all proc code from kernel. Maybe 
even user processes data should be exported using sysfs (like 
/sys/processes/123/maps/41610000/file)? But this is my personal opinion.


Grzegorz Kulewski