Re: [PATCHSET v6 0/3] Add support for ring mapped provided buffers

[Jens Axboe <axboe@kernel.dk>]

On 5/17/22 8:20 AM, Hao Xu wrote:
> On 5/17/22 00:21, Jens Axboe wrote:
>> Hi,
>>
>> This series builds to adding support for a different way of doing
>> provided buffers, which is a lot more efficient than the existing scheme
>> for high rate of consumption/provision of buffers. The interesting bits
>> here are patch 3, which also has some performance numbers an an
>> explanation of it.
>>
>> Patch 1 adds NOP support for provided buffers, just so that we can
>> benchmark the last change.
>>
>> Patch 2 just abstracts out the pinning code.
>>
>> Patch 3 adds the actual feature.
>>
>> This passes the full liburing suite, and various test cases I adopted
>> to use ring provided buffers.
>>
>> v6:
>> - Change layout so that 'head' overlaps with reserved field in first
>>    buffer, avoiding the weird split of first page having N-1 buffers and
>>    the rest N (Dylan)
>> - Rebase on current kernel bits
>> - Fix missing ring unlock on out-of-bufs
>> - Fix issue in io_recv()
>>
>> Can also be found in my git repo, for-5.19/io_uring-pbuf branch:
>>
>> https://git.kernel.dk/cgit/linux-block/log/?h=for-5.19/io_uring-pbuf
>>
>> and there's an associated liburing branch too:
>>
>> https://git.kernel.dk/cgit/liburing/log/?h=huge
> 
> should be the buf-ring branch I guess

Oops yes indeed.


-- 
Jens Axboe