Re: [Xen-devel] [Draft D] Xen on ARM vITS Handling

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 05/06/2015 07:07, Vijay Kilari wrote:
> On Thu, Jun 4, 2015 at 7:24 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> > This information shall include at least:
> >
> > - The Device ID of the device.
> > - The maximum number of Events which the device is capable of
> >    generating.
> >
> > When a device is discovered/registered (i.e. when all necessary
> > information is available) then:
> >
> > - `struct its_device` and the embedded `events` array will be
> >    allocated (the latter with `nr_events` elements).
> > - The `struct its_device` will be inserted into a mapping (possibly an
> >    R-B tree) from its physical Device ID to the `struct its`.
>     Why not radix tree. It might be better in look up?
The lookup up in the radix tree is in O(k) where k is the size of the 
index (i.e the number of DevID bits).
In the R-B tree, the lookup is in O(log(n)) where n is the number of 
member in the tree.
As we use integer for the index, the R-B tree will be faster (The number 
of PCI device per domain will never be too big).
Regards,

--
Julien Grall

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