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From: Daurnimator <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected]
Subject: Re: [PATCHSET 0/4] Add support for shared io-wq backends
Date: Sun, 26 Jan 2020 12:51:53 +1100	[thread overview]
Message-ID: <CAEnbY+c34Uiguq=11eZ1F0z_VZopeBbw1g1gfn-S0Fb5wCaL5A@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>

On Fri, 24 Jan 2020 at 10:16, Jens Axboe <[email protected]> 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).

I don't love the idea of some new type of magic user<>kernel
identifier. It would be nice if the id itself was e.g. a file
descriptor

What if when creating an io_uring you could pass in an existing
io_uring file descriptor, and the new one would share the io-wq
backend?

  parent reply	other threads:[~2020-01-26  1:52 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 23:16 [PATCHSET 0/4] Add support for shared io-wq backends Jens Axboe
2020-01-23 23:16 ` [PATCH 1/4] io-wq: make the io_wq ref counted Jens Axboe
2020-01-23 23:16 ` [PATCH 2/4] io-wq: add 'id' to io_wq Jens Axboe
2020-01-23 23:16 ` [PATCH 3/4] io-wq: allow lookup of existing io_wq with given id Jens Axboe
2020-01-24  9:54   ` Stefan Metzmacher
2020-01-24 16:41     ` Jens Axboe
2020-01-23 23:16 ` [PATCH 4/4] io_uring: add support for sharing kernel io-wq workqueue Jens Axboe
2020-01-24  9:51 ` [PATCHSET 0/4] Add support for shared io-wq backends Stefan Metzmacher
2020-01-24 16:43   ` Jens Axboe
2020-01-24 19:14     ` Stefan Metzmacher
2020-01-24 21:37       ` Jens Axboe
2020-01-24 20:34 ` Pavel Begunkov
2020-01-24 21:38   ` Jens Axboe
2020-01-26  1:51 ` Daurnimator [this message]
2020-01-26 15:11   ` Pavel Begunkov
2020-01-26 17:00     ` Jens Axboe
2020-01-27 13:29       ` Pavel Begunkov
2020-01-27 13:39         ` Jens Axboe
2020-01-27 14:07           ` Pavel Begunkov
2020-01-27 19:39             ` Pavel Begunkov
2020-01-27 19:45               ` Jens Axboe
2020-01-27 20:33             ` Jens Axboe
2020-01-27 21:45               ` Pavel Begunkov
2020-01-27 22:40                 ` Jens Axboe
2020-01-27 23:00                   ` Jens Axboe
2020-01-27 23:17                     ` Pavel Begunkov
2020-01-27 23:23                       ` Jens Axboe
2020-01-27 23:25                         ` Pavel Begunkov
2020-01-27 23:38                           ` Jens Axboe
2020-01-28 10:01                             ` Stefan Metzmacher
2020-01-28 10:30                               ` Pavel Begunkov
2020-01-28 10:35                                 ` Stefan Metzmacher
2020-01-28 10:51                                   ` Pavel Begunkov

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