Re: Multiple-page mem_event ring buffer?

[Razvan Cojocaru <rzvncj@gmail.com>]

>> Could I safely use more than one page for the ring buffer (passing '2'
>> as the last parameter of xc_map_foreign_batch(), and so on), or am I
>> limited to 1 page by design?
>
> You would have to change Xen itself to also view the N pages as a contiguous region in the virtual address space. I think vmap has been recently added for that purpose, but I know nothing about its limitations (cc'ing Jan).
>
> You would also want to retain the old interface and add a new domctl for N-page ring setup. And some refactoring of all the places where that sequence of calls needed for setup is repeated. And a pony ;)

Ah, that's what I thought. Will ask management to budget for the pony :)


Thanks,
Razvan Cojocaru