From: Andres Freund <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected]
Subject: Re: [PATCH 5/6] io_uring: add support for futex wake and wait
Date: Fri, 23 Jun 2023 12:04:18 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
Hi,
I'd been chatting with Jens about this, so obviously I'm interested in the
feature...
On 2023-06-09 12:31:24 -0600, Jens Axboe wrote:
> Add support for FUTEX_WAKE/WAIT primitives.
>
> IORING_OP_FUTEX_WAKE is mix of FUTEX_WAKE and FUTEX_WAKE_BITSET, as
> it does support passing in a bitset.
>
> Similary, IORING_OP_FUTEX_WAIT is a mix of FUTEX_WAIT and
> FUTEX_WAIT_BITSET.
One thing I was wondering about is what happens when there are multiple
OP_FUTEX_WAITs queued for the same futex, and that futex gets woken up. I
don't really have an opinion about what would be best, just that it'd be
helpful to specify the behaviour.
Greetings,
Andres Freund
next prev parent reply other threads:[~2023-06-23 19:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 18:31 [PATCHSET RFC 0/6] Add io_uring support for futex wait/wake Jens Axboe
2023-06-09 18:31 ` [PATCH 1/6] futex: abstract out futex_op_to_flags() helper Jens Axboe
2023-06-09 18:31 ` [PATCH 2/6] futex: factor out the futex wake handling Jens Axboe
2023-06-09 18:31 ` [PATCH 3/6] futex: assign default futex_q->wait_data at insertion time Jens Axboe
2023-06-09 18:31 ` [PATCH 4/6] futex: add futex wait variant that takes a futex_q directly Jens Axboe
2023-06-09 18:31 ` [PATCH 5/6] io_uring: add support for futex wake and wait Jens Axboe
2023-06-12 16:06 ` Gabriel Krisman Bertazi
2023-06-12 20:37 ` Jens Axboe
2023-06-12 23:00 ` Gabriel Krisman Bertazi
2023-06-13 1:09 ` Jens Axboe
2023-06-13 2:55 ` io_uring link semantics (was [PATCH 5/6] io_uring: add support for futex wake and wait) Gabriel Krisman Bertazi
2023-06-23 19:04 ` Andres Freund [this message]
2023-06-23 19:07 ` [PATCH 5/6] io_uring: add support for futex wake and wait Jens Axboe
2023-06-23 19:34 ` Andres Freund
2023-06-23 19:46 ` Jens Axboe
2023-06-09 18:31 ` [PATCH 6/6] io_uring/futex: enable use of the allocation caches for futex_q Jens Axboe
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