Re: [PATCHSET 0/4] Add support for shared io-wq backends

[Jens Axboe <axboe@kernel.dk>]

On 1/24/20 1:34 PM, Pavel Begunkov wrote:
> On 24/01/2020 02:16, Jens Axboe wrote:
>> Sometimes an applications wants to use multiple smaller rings, because
>> it's more efficient than sharing a ring. The downside of that is that
>> we'll create the io-wq backend separately for all of them, while they
>> would be perfectly happy just sharing that.
>>
>> This patchset adds support for that. io_uring_params grows an 'id' field,
>> which denotes an identifier for the async backend. If an application
>> wants to utilize sharing, it'll simply grab the id from the first ring
>> created, and pass it in to the next one and set IORING_SETUP_SHARED. This
>> allows efficient sharing of backend resources, while allowing multiple
>> rings in the application or library.
>>
>> Not a huge fan of the IORING_SETUP_SHARED name, we should probably make
>> that better (I'm taking suggestions).
>>
> 
> Took a look at the latest version (b942f31ee0 at io_uring-vfs-shared-wq).
> There is an outdated commit message for the last patch mentioning renamed
> IORING_SETUP_SHARED, but the code looks good to me.
> 
> Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>

Thanks for the review, I'll add your reviewed-by and fix up that commit
message too.

-- 
Jens Axboe