From: Jens Axboe <axboe@kernel.dk>
To: Pavel Begunkov <asml.silence@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org
Cc: io-uring@vger.kernel.org
Subject: Re: [PATCH v2] /dev/mem: nowait zero/null ops
Date: Wed, 8 Sep 2021 13:15:27 -0600 [thread overview]
Message-ID: <9370d400-3944-b62a-65f6-5c31ac86ea35@kernel.dk> (raw)
In-Reply-To: <f11090f97ddc2b2ce49ea1211258658ddfbc5563.1631127867.git.asml.silence@gmail.com>
On 9/8/21 1:10 PM, Pavel Begunkov wrote:
> Make read_iter_zero() to honor IOCB_NOWAIT, so /dev/zero can be
> advertised as FMODE_NOWAIT. It's useful for io_uring, which needs it to
> apply certain optimisations when doing I/O against the device.
>
> Set FMODE_NOWAIT for /dev/null as well, it never waits and therefore
> trivially meets the criteria.
Reviewed-by: Jens Axboe <axboe@kernel.dk>
--
Jens Axboe
prev parent reply other threads:[~2021-09-08 19:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-08 19:10 [PATCH v2] /dev/mem: nowait zero/null ops Pavel Begunkov
2021-09-08 19:15 ` Jens Axboe [this message]
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