From: Peter Zijlstra <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected], [email protected],
[email protected], [email protected]
Subject: Re: [PATCH 7/7] io_uring: add futex waitv
Date: Wed, 12 Jul 2023 11:31:52 +0200 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On Tue, Jul 11, 2023 at 06:47:05PM -0600, Jens Axboe wrote:
> Needs a bit of splitting and a few hunks should go further back (like
> the wake handler typedef).
>
> WIP, adds IORING_OP_FUTEX_WAITV - pass in an array of futex addresses,
> and wait on all of them until one of them triggers.
>
So I'm once again not following. FUTEX_WAITV is to wait on multiple
futexes and get a notification when any one of them wakes up with an
index to indicate which one.
How exactly is that different from multiple FUTEX_WAIT entries in the
io_uring thing itself? Admittedly I don't actually know much of anything
when it comes to io_uring, but isn't the idea that queue multiple
'syscall' like things and get individual completions back?
So how does WAITV make sense here?
next prev parent reply other threads:[~2023-07-12 9:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-12 0:46 [PATCHSET 0/7] Add io_uring futex/futexv support Jens Axboe
2023-07-12 0:46 ` [PATCH 1/7] futex: abstract out futex_op_to_flags() helper Jens Axboe
2023-07-12 8:16 ` Peter Zijlstra
2023-07-12 14:59 ` Jens Axboe
2023-07-12 0:47 ` [PATCH 2/7] futex: factor out the futex wake handling Jens Axboe
2023-07-12 8:58 ` Peter Zijlstra
2023-07-12 15:02 ` Jens Axboe
2023-07-12 0:47 ` [PATCH 3/7] io_uring: add support for futex wake and wait Jens Axboe
2023-07-12 8:51 ` Peter Zijlstra
2023-07-12 15:05 ` Jens Axboe
2023-07-12 0:47 ` [PATCH 4/7] futex: add wake_data to struct futex_q Jens Axboe
2023-07-12 0:47 ` [PATCH 5/7] futex: make futex_parse_waitv() available as a helper Jens Axboe
2023-07-12 9:25 ` Peter Zijlstra
2023-07-12 15:06 ` Jens Axboe
2023-07-12 0:47 ` [PATCH 6/7] futex: make the vectored futex operations available Jens Axboe
2023-07-12 0:47 ` [PATCH 7/7] io_uring: add futex waitv Jens Axboe
2023-07-12 9:31 ` Peter Zijlstra [this message]
2023-07-12 15:10 ` Jens Axboe
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