From: David Laight <David.Laight@ACULAB.COM>
To: 'Christophe Leroy' <christophe.leroy@csgroup.eu>,
Christoph Hellwig <hch@lst.de>, "arnd@arndb.de" <arnd@arndb.de>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] /dev/zero: also implement ->read
Date: Thu, 3 Sep 2020 21:35:00 +0000 [thread overview]
Message-ID: <3b0b58be4b844162b73db1b108a9b995@AcuMS.aculab.com> (raw)
In-Reply-To: <55d1ecb8-4a0c-fa58-d3cf-bf6796eea7bd@csgroup.eu>
From: Christophe Leroy
>
>
> Le 03/09/2020 à 17:59, Christoph Hellwig a écrit :
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add this trivial function. Note that /dev/zero
> > already implements both an iter and non-iter writes so this just
> > makes it more symmetric.
> >
> > Christophe Leroy <christophe.leroy@csgroup.eu>
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
>
> Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Any idea what has happened to make the 'iter' version so bad?
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-09-03 21:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 15:59 Christoph Hellwig
2020-09-03 16:05 ` Christophe Leroy
2020-09-03 21:35 ` David Laight [this message]
2020-09-06 18:21 ` Pavel Machek
2020-09-06 18:35 ` Christophe Leroy
2020-09-06 18:38 ` Pavel Machek
2020-09-06 18:47 ` Christophe Leroy
2020-09-06 20:09 ` gregkh
2020-09-06 20:52 ` David Laight
2020-09-07 4:44 ` Christophe Leroy
2020-09-07 8:18 ` David Laight
2020-09-03 17:51 ` Christophe Leroy
2020-09-03 18:02 ` Greg KH
2020-09-06 22:34 ` Rasmus Villemoes
2020-09-07 6:20 ` Christoph Hellwig
2020-09-07 6:50 ` Rasmus Villemoes
2020-09-07 7:30 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3b0b58be4b844162b73db1b108a9b995@AcuMS.aculab.com \
--to=david.laight@aculab.com \
--cc=arnd@arndb.de \
--cc=christophe.leroy@csgroup.eu \
--cc=gregkh@linuxfoundation.org \
--cc=hch@lst.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®