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
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