Re: [PATCHSET v2 RFC 0/11] Add support for ring mapped provided buffers

[Jens Axboe <axboe@kernel.dk>]

On 5/1/22 8:25 AM, Jens Axboe wrote:
> On 5/1/22 7:39 AM, Pavel Begunkov wrote:
>> I'd suggest for mapped pbuffers to have an old plain array with
>> sequential indexing, just how we do it for fixed buffers. Do normal
>> and mapped pbuffers share something that would prevent it?
> 
> Ah yes, we could do that. Registering it returns the group ID instead of
> providing it up front.

Actually I'd rather just have the app provide it, but recommendations
can be made in terms of using mostly sequential indexes. I suspect
that's what most would naturally do anyway.

I'm thinking just straight array of X entries, and then a fallback to
xarray if we go beyond that to ensure we don't grow the buffer group
array to crazy values.

I'll do this as a prep patch, not really related to the actual change
here, but will benefit both the classic and ring buffers alike.

-- 
Jens Axboe