El día 29 de diciembre de 2010 17:16, Greg KH <greg@xxxxxxxxx> escribió:
> On Wed, Dec 29, 2010 at 05:08:56PM +0100, José Félix Ontañón wrote:
>> El día 29 de diciembre de 2010 01:18, Scott James Remnant
>> <scott@xxxxxxxxxxxx> escribió:
>> > 2010/12/28 Lennart Poettering <lennart@xxxxxxxxxxxxxx>:
>> >> On Tue, 28.12.10 14:14, José Félix Ontañón (felixonta@xxxxxxxxx) wrote:
>> >>
>> >>> Hi, everybody!
>> >>>
>> >>> Maybe this is kinda silly question but, I wonder why isn't
>> >>> "ID_VENDOR_FROM_DATABASE / ID_MODEL_FROM_DATABASE"-like properties
>> >>> imported by default using the pretty /lib/udev/usb-db and
>> >>> /lib/udev/pci-db commands for every founded pci/usb device?
>> >>>
>> >>> I mean, by adding this simple rules:
>> >>>
>> >>> SUBSYSTEMS=="usb", IMPORT{program}="usb-db %p"
>> >>> SUBSYSTEMS=="pci", IMPORT{program}="pci-db %p"
>> >>>
>> >>> I think this properties are very useful for apps that discover
>> >>> hardware through udev, so they will not have to reinvent the wheel by
>> >>> finding vendor/product names by themselves. Don't you think?
>> >>
>> >> The database lookup is a linear search. As long as we invoke it only for
>> >> a small subset of devices that doesn't really matter much. But if we
>> >> start to look it up for every device we should probably spend the time
>> >> to improve the db lookup first.
>> >>
>> >> It's simply a question of efficiency.
>> >>
>> > One thing that might be interesting is if we could do the lookup at
>> > the point of query, then store the answer back in the db for others to
>> > use later.
>> >
>> > That way we're efficient if nobody cares, and lose that efficiency
>> > when they do (but only for the devices they query), and subsequently
>> > efficient because the answer is cached.
>> >
>> > This veers a bit dangerously towards having apps that link with
>> > libudev process rules though?
>> >
>> > Scott
>> >
>>
>> First thing coming to my mind: there's not enough pci/usb devices
>> present on the system for increasing the computational cost
>> significantly.
>
> How can you say that? I see systems with thousands of PCI devices on it
> as being very common in some areas.
You're right, I was to fast thinking about personal_computers-like
only. That's because I said it maybe was a silly question, sorry.
>> I think it's quite comfortable, for me as desktop app coder, to
>> delegate on udev the vendor/model name querying, more if we think udev
>> provides the cool pci-db and usb-db commands.
>
> Again, what's wrong with using libpci directly for this? That's what it
> is there for.
Greg, i'm coding python, do you know about a python bindings for
libpci? It would be really nice if you could tell me because I didn't
found.
Thanks for your answers.
> thanks,
>
> greg k-h
>
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