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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	io-uring@vger.kernel.org
Subject: Re: [PATCH] /dev/mem: nowait zero/null ops
Date: Wed, 8 Sep 2021 12:25:36 +0200	[thread overview]
Message-ID: <YTiPoKc9GiG52DNd@kroah.com> (raw)
In-Reply-To: <16c78d25f507b571df7eb852a571141a0fdc73fd.1631095567.git.asml.silence@gmail.com>

On Wed, Sep 08, 2021 at 11:06:51AM +0100, Pavel Begunkov wrote:
> Make read_iter_zero() to honor IOCB_NOWAIT, so /dev/zero can be
> advertised as FMODE_NOWAIT. This helps subsystems like io_uring to use
> it more effectively. Set FMODE_NOWAIT for /dev/null as well, it never
> waits and therefore trivially meets the criteria.

I do not understand, why would io_uring need to use /dev/zero and how is
this going to help anything?

What workload does this help with?

thanks,

greg k-h

  reply	other threads:[~2021-09-08 10:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 10:06 [PATCH] /dev/mem: nowait zero/null ops Pavel Begunkov
2021-09-08 10:25 ` Greg Kroah-Hartman [this message]
2021-09-08 10:54   ` Pavel Begunkov
2021-09-08 12:57 ` Jens Axboe
2021-09-08 13:07   ` Pavel Begunkov
2021-09-08 13:53     ` Jens Axboe

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