linux-kernel - Re: [RFC -next 00/10] Add ZC notifications to splice and sendfile

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Message-ID: <Z9p6oFlHxkYvUA8N@infradead.org>
Date: Wed, 19 Mar 2025 01:04:48 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	asml.silence@...il.com, linux-fsdevel@...r.kernel.org,
	edumazet@...gle.com, pabeni@...hat.com, horms@...nel.org,
	linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
	viro@...iv.linux.org.uk, jack@...e.cz, kuba@...nel.org,
	shuah@...nel.org, sdf@...ichev.me, mingo@...hat.com, arnd@...db.de,
	brauner@...nel.org, akpm@...ux-foundation.org, tglx@...utronix.de,
	jolsa@...nel.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC -next 00/10] Add ZC notifications to splice and sendfile

On Wed, Mar 19, 2025 at 12:15:11AM +0000, Joe Damato wrote:
> One way to fix this is to add zerocopy notifications to sendfile similar
> to how MSG_ZEROCOPY works with sendmsg. This is possible thanks to the
> extensive work done by Pavel [1].

What is a "zerocopy notification" and why aren't you simply plugging
this into io_uring and generate a CQE so that it works like all other
asynchronous operations?