linux-kernel - Re: [PATCH 9/9] io_uring: pass submission ref to async

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Message-ID: <902c439f-81ff-7593-e6b4-eee3f217c292@kernel.dk>
Date:   Mon, 2 Mar 2020 08:12:44 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] io_uring: pass submission ref to async

On 3/2/20 8:08 AM, Pavel Begunkov wrote:
> On 3/2/2020 12:39 AM, Pavel Begunkov wrote:
>> On 01/03/2020 19:18, Pavel Begunkov wrote:
>>> Currenlty, every async work handler accepts a submission reference,
>>> which it should put. Also there is a reference grabbed in io_get_work()
>>> and dropped in io_put_work(). This patch merge them together.
>>>
>>> - So, ownership of the submission reference passed to io-wq, and it'll
>>> be put in io_put_work().
>>> - io_get_put() doesn't take a ref now and so deleted.
>>> - async handlers don't put the submission ref anymore.
>>> - make cancellation bits of io-wq to call {get,put}_work() handlers
>>
>> Hmm, it makes them more like {init,fini}_work() and unbalanced/unpaired. May be
>> no a desirable thing.
> 
> Any objections against replacing {get,put}_work() with
> io_finilise_work()? It will be called once and only once, and a work
> must not go away until it happened. It will be enough for now, but not
> sure whether you have some plans for this get/put pinning.

I have no further plans there, the get/put work only exist to ensure that
the work item stays valid in case of cancelation lookups.

-- 
Jens Axboe