linux-kernel - Re: [PATCH] io_uring: wakeup threads waiting for EPOLLOUT events

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Message-ID: <3805d100-c687-e49e-9317-7cd9b387a3a7@kernel.dk>
Date:   Thu, 23 Jan 2020 18:28:06 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] io_uring: wakeup threads waiting for EPOLLOUT events

On 1/23/20 2:45 PM, Stefano Garzarella wrote:
> On Thu, Jan 23, 2020 at 12:13:57PM -0700, Jens Axboe wrote:
>> On 1/16/20 10:03 AM, Stefano Garzarella wrote:
>>> On Thu, Jan 16, 2020 at 09:30:12AM -0700, Jens Axboe wrote:
>>>> On 1/16/20 9:26 AM, Stefano Garzarella wrote:
>>>>>> Since the use case is mostly single submitter, unless you're doing
>>>>>> something funky or unusual, you're not going to be needing POLLOUT ever.
>>>>>
>>>>> The case that I had in mind was with kernel side polling enabled and
>>>>> a single submitter that can use epoll() to wait free slots in the SQ
>>>>> ring. (I don't have a test, maybe I can write one...)
>>>>
>>>> Right, I think that's the only use case where it makes sense, because
>>>> you have someone else draining the sq side for you. A test case would
>>>> indeed be nice, liburing has a good arsenal of test cases and this would
>>>> be a good addition!
>>>
>>> Sure, I'll send a test to liburing for this case!
>>
>> Gentle ping on the test case :-)
>>
> 
> Yes, you are right :-)
> 
> I was a little busy this week to finish some works before DevConf.  I
> hope to work on the test case these days, so by Monday I hope I have
> it ;-)

Thanks, all good, just a gentle nudge ;-)

-- 
Jens Axboe