Re: devfs vs udev/hotplug

[Dave Leimbach <leimySPAM2k@xxxxxxx>]

Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx> writes:

>     I wasn't even thinking of a userland file server.  I was simply thinking
>     of a userland demon which creates and destroys CHR special files based
>     on instructions from the kernel.

Oh I see... a "thingy" that handles MAKEDEV :).  That's not going to have
much in the way of problem and is probably very easily implementable.

> 
>     Devices are not created and destroyed all that often, so performance 
>     isn't really an issue.

Sure.. unless you like to plug in and unplug your USB keyboard a lot and very
fast... 

> 
> 					-Matt
> 					Matthew Dillon 
> 					<dillon@xxxxxxxxxxxxx>
> 
> :> Doesn't this sort of design imply that the kernel is instructing a daemon
> :> to make kernel calls to service the requests?  Isn't that a lot of 
> :> address space crossing or do I not understand how a userland file "server"
> :> would work?  I realize that this will be done with fast messages but such
> :> designs leave me with "speed" doubts.  This might be a bad example for when
> :> that speed matters though.
> :> 
> :> Dave
> :
> :	I don't think speed will be much of an issue, once Async
> :	messaging and a Shared Memory Segment between userland and
> :	kernel is implemented.  One can utilize that.
> :
> :	Regards,
> :
> :		-Hiten