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Subject: Re: [PATCH v2 0/2] Optimise io_uring completion waiting
From:   Jens Axboe <axboe@kernel.dk>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Pavel Begunkov <asml.silence@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, Ingo Molnar <mingo@redhat.com>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
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Date:   Tue, 24 Sep 2019 12:34:17 +0200
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On 9/24/19 4:13 AM, Jens Axboe wrote:
> On 9/24/19 3:49 AM, Peter Zijlstra wrote:
>> On Tue, Sep 24, 2019 at 10:36:28AM +0200, Jens Axboe wrote:
>>
>>> +struct io_wait_queue {
>>> +	struct wait_queue_entry wq;
>>> +	struct io_ring_ctx *ctx;
>>> +	struct task_struct *task;
>>
>> wq.private is where the normal waitqueue stores the task pointer.
>>
>> (I'm going to rename that)
> 
> If you do that, then we can just base the io_uring parts on that.

Just took a quick look at it, and ran into block/kyber-iosched.c that
actually uses the private pointer for something that isn't a task
struct...

-- 
Jens Axboe