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From: Pavel Begunkov <asml.silence@gmail.com>
To: Josh Triplett <josh@joshtriplett.org>, Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [RFC 0/4] open/accept directly into io_uring fixed file table
Date: Fri, 13 Aug 2021 17:30:19 +0100	[thread overview]
Message-ID: <81438f45-ac1d-4244-8d56-dbb44bb6d8b1@gmail.com> (raw)
In-Reply-To: <YOXCeNs0waut1Jh1@localhost>

On 7/7/21 4:04 PM, Josh Triplett wrote:
> On Wed, Jul 07, 2021 at 07:07:52AM -0600, Jens Axboe wrote:
>> On 7/7/21 5:39 AM, Pavel Begunkov wrote:
>>> Implement an old idea allowing open/accept io_uring requests to register
>>> a newly created file as a io_uring's fixed file instead of placing it
>>> into a task's file table. The switching is encoded in io_uring's SQEs
>>> by setting sqe->buf_index/file_index, so restricted to 2^16-1. Don't
>>> think we need more, but may be a good idea to scrap u32 somewhere
>>> instead.
>>>
>>> From the net side only needs a function doing __sys_accept4_file()
>>> but not installing fd, see 2/4.
>>>
>>> Only RFC for now, the new functionality is tested only for open yet.
>>> I hope we can remember the author of the idea to add attribution.
>>
>> Pretty sure the original suggester of this as Josh, CC'ed.
> 
> Thanks for working on this, Pavel!
> 
> Original thread at

Totally was thinking it was only a discussion but not an actual patch,
and I even did comment on it! Sorry Josh, would have persuaded you to
finish it, if I remembered that.

> https://lore.kernel.org/io-uring/20200715004209.GA334456@localhost/T/ in
> case that helps.
> 

-- 
Pavel Begunkov

  reply	other threads:[~2021-08-13 16:30 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07 11:39 Pavel Begunkov
2021-07-07 11:39 ` [PATCH 1/4] io_uring: allow open directly into fixed fd table Pavel Begunkov
2021-07-07 11:39 ` [PATCH 2/4] net: add an accept helper not installing fd Pavel Begunkov
2021-07-07 11:39 ` [PATCH 3/4] io_uring: hand code io_accept()' fd installing Pavel Begunkov
2021-07-07 11:39 ` [PATCH 4/4] io_uring: accept directly into fixed file table Pavel Begunkov
2021-07-07 13:07 ` [RFC 0/4] open/accept directly into io_uring " Jens Axboe
2021-07-07 13:59   ` Stefan Metzmacher
2021-07-07 15:01     ` Jens Axboe
2021-07-07 15:04   ` Josh Triplett
2021-08-13 16:30     ` Pavel Begunkov [this message]
2021-07-21  7:11 ` Hao Xu

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