From: Avi Kivity <avi@argo.co.il>
To: Alexander Shishckin <alexander.shishckin@gmail.com>
Cc: Valdis.Kletnieks@vt.edu, Bongani Hlope <bhlope@mweb.co.za>,
Kyle Moffett <mrmacman_g4@mac.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: Compiling C++ modules
Date: Wed, 26 Apr 2006 07:39:00 +0300 [thread overview]
Message-ID: <444EF964.30704@argo.co.il> (raw)
In-Reply-To: <71a0d6ff0604251646g4fc90b3dr30a03b8606360e7f@mail.gmail.com>
Alexander Shishckin wrote:
> On 4/26/06, Avi Kivity <avi@argo.co.il> wrote:
>
>> Not in this case. The constructor is an assignment. The destructor is an
>> if () followed by a delete. In this case, the if () is optimized away so
>> you are left with less generated code than the C case, for the
>> non-exceptional path.
>>
> Relying on compiler optimisations is just as well stupid as hunting
> trialing writespaces in a dark room miles away.
>
It'd like to see the output of 'size vmlinux' with optimizations turned
off. The kernel is full of forwarding functions and constructs that
optimize away to nothing.
Last time I tried, the kernel wouldn't even compile at -O0, but that may
have changed with the always_inline work.
And it is *not relying* on compiler optimizations that is stupid. It
means you're throwing away the work of the compiler folk, and doing it
instead *by hand* at every piece of code you write.
> It's almost about time to quit this thread and show us some code that
> works. (Forked from 2.6.16, bootable on an average amount of
> architectures...)
>
Ha ha.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2006-04-26 4:39 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-24 19:16 Compiling C++ modules Gary Poppitz
2006-04-24 19:27 ` Greg KH
2006-04-24 20:02 ` C++ pushback Gary Poppitz
2006-04-24 20:15 ` Christoph Hellwig
2006-04-24 20:16 ` Greg KH
2006-04-24 20:18 ` Martin Mares
2006-04-24 21:36 ` Jeff V. Merkey
2006-04-24 21:28 ` J.A. Magallon
2006-04-24 21:43 ` Harald Arnesen
2006-04-24 21:52 ` Alan Cox
2006-04-24 22:16 ` J.A. Magallon
2006-04-25 0:05 ` Harald Arnesen
2006-04-25 0:46 ` Diego Calleja
2006-04-25 9:12 ` Harald Arnesen
2006-04-25 1:30 ` linux-os (Dick Johnson)
2006-04-25 2:58 ` marty fouts
2006-04-27 22:55 ` Bill Davidsen
2006-05-02 15:58 ` Randy.Dunlap
2006-05-02 20:36 ` David Schwartz
2006-04-25 8:15 ` Xavier Bestel
2006-04-25 8:42 ` Avi Kivity
2006-04-25 8:52 ` Martin Mares
2006-04-25 9:00 ` Avi Kivity
2006-04-25 9:05 ` Martin Mares
2006-04-25 9:13 ` Avi Kivity
2006-04-25 9:22 ` Xavier Bestel
2006-04-25 20:20 ` J.A. Magallon
2006-04-25 20:31 ` Barry Kelly
2006-04-25 9:09 ` Nikita Danilov
2006-04-25 20:10 ` J.A. Magallon
2006-04-25 18:02 ` Geert Uytterhoeven
2006-04-27 9:09 ` Alexander E. Patrakov
2006-04-24 22:39 ` Willy Tarreau
2006-04-24 22:57 ` Jeff V. Merkey
2006-04-24 23:02 ` David Schwartz
2006-04-25 8:55 ` Martin Mares
2006-04-25 8:59 ` Jan Engelhardt
2006-04-25 14:37 ` David Schwartz
2006-04-25 19:50 ` Martin Mares
2006-04-26 2:33 ` David Schwartz
2006-04-26 3:42 ` Matthew Frost
2006-04-26 19:25 ` David Schwartz
2006-04-26 20:01 ` Jan-Benedict Glaw
2006-04-26 20:09 ` Linus Torvalds
2006-04-26 20:19 ` Al Viro
2006-04-26 21:37 ` Sam Ravnborg
2006-04-28 9:23 ` Avi Kivity
2006-04-28 12:00 ` linux-os (Dick Johnson)
2006-04-28 12:46 ` Jan-Benedict Glaw
2006-04-26 20:25 ` Jan-Benedict Glaw
2006-04-26 20:43 ` David Schwartz
2006-04-26 23:00 ` Roman Kononov
2006-04-27 0:38 ` Kyle Moffett
2006-04-27 2:05 ` Roman Kononov
2006-04-27 3:37 ` Kyle Moffett
2006-04-27 5:37 ` Roman Kononov
2006-04-27 13:58 ` Michael Buesch
2006-04-27 14:22 ` linux-os (Dick Johnson)
2006-04-27 8:07 ` Avi Kivity
2006-04-27 13:55 ` Denis Vlasenko
2006-04-27 14:27 ` Avi Kivity
2006-04-27 14:56 ` Denis Vlasenko
2006-04-27 15:54 ` Bob Copeland
2006-04-27 16:03 ` Avi Kivity
2006-04-27 15:00 ` Martin Mares
2006-04-27 15:31 ` Avi Kivity
2006-04-27 15:38 ` Martin Mares
2006-04-28 8:16 ` Avi Kivity
2006-04-28 8:30 ` Avi Kivity
2006-04-28 15:47 ` Jan Engelhardt
2006-04-28 15:51 ` Jan Engelhardt
2006-04-28 16:51 ` Avi Kivity
2006-04-27 14:50 ` Sam Ravnborg
2006-04-27 8:50 ` Martin Mares
2006-04-27 3:57 ` Willy Tarreau
2006-04-27 5:53 ` Roman Kononov
2006-04-27 7:55 ` Jan-Benedict Glaw
2006-04-27 17:20 ` C++ pushback (when does this religious thread end?) Leonard Peterson
2006-04-30 17:48 ` C++ pushback Jan Harkes
2006-04-30 20:55 ` David Schwartz
2006-04-26 20:05 ` linux-os (Dick Johnson)
2006-04-26 20:09 ` Xavier Bestel
2006-04-26 20:44 ` Randy.Dunlap
2006-05-02 20:09 ` C++ pushback + sparse Randy.Dunlap
2006-04-27 7:49 ` C++ pushback Jiri Kosina
2006-04-26 21:05 ` Martin Mares
2006-04-25 7:33 ` Avi Kivity
2006-04-25 7:47 ` Nick Piggin
2006-05-13 16:21 ` Esben Nielsen
2006-04-24 20:36 ` Thiago Galesi
2006-04-24 21:38 ` Kurt Wall
2006-04-27 16:17 ` Roman Kononov
2006-04-27 21:59 ` Grant Coady
2006-04-27 22:09 ` Bill Davidsen
2006-04-27 23:19 ` Jan Knutar
2006-04-24 19:30 ` Compiling C++ modules Al Viro
2006-04-24 19:40 ` linux-os (Dick Johnson)
2006-04-24 20:54 ` Geert Uytterhoeven
2006-04-24 19:42 ` Alexey Dobriyan
2006-04-24 20:30 ` Daniel Barkalow
2006-04-24 20:35 ` C++ is in US [Re: Compiling C++ modules] Jiri Slaby
2006-04-24 20:45 ` Compiling C++ modules Alan Cox
2006-04-24 21:03 ` Avi Kivity
2006-04-24 21:23 ` Joshua Hudson
2006-04-24 21:29 ` Kyle Moffett
2006-04-24 21:50 ` marty fouts
2006-04-24 22:09 ` Martin Mares
2006-04-24 22:30 ` Willy Tarreau
2006-04-24 22:32 ` Joshua Hudson
2006-04-24 22:45 ` marty fouts
2006-04-25 15:32 ` Michael Buesch
2006-04-25 7:08 ` Avi Kivity
2006-04-25 10:23 ` James Courtier-Dutton
2006-04-25 15:59 ` Kyle Moffett
2006-04-25 16:46 ` Avi Kivity
2006-04-25 17:10 ` Dmitry Torokhov
2006-04-25 17:19 ` Avi Kivity
2006-04-25 17:28 ` Dmitry Torokhov
2006-04-25 17:53 ` Avi Kivity
2006-04-25 18:04 ` Dmitry Torokhov
2006-04-25 18:08 ` Valdis.Kletnieks
2006-04-25 18:26 ` Avi Kivity
2006-04-25 18:38 ` Avi Kivity
2006-04-25 18:52 ` Michael Poole
2006-04-25 19:13 ` Avi Kivity
2006-04-27 15:10 ` Denis Vlasenko
2006-04-27 20:15 ` Willy Tarreau
2006-04-27 21:08 ` Davi Arnaut
2006-04-28 9:33 ` Avi Kivity
2006-04-28 10:03 ` Avi Kivity
2006-04-28 11:27 ` Sergei Organov
2006-04-28 11:03 ` Martin Mares
2006-04-28 11:30 ` Avi Kivity
2006-04-28 15:56 ` Jan Engelhardt
2006-04-28 17:02 ` Avi Kivity
2006-04-28 17:38 ` linux-os (Dick Johnson)
2006-04-29 2:50 ` Christer Weinigel
2006-05-01 17:46 ` Dave Neuer
2006-05-01 20:21 ` Jan Engelhardt
2006-05-01 23:53 ` David Schwartz
2006-05-02 5:12 ` Willy Tarreau
2006-05-02 10:32 ` Avi Kivity
2006-05-02 11:15 ` Martin Mares
2006-05-02 11:26 ` Avi Kivity
2006-05-02 11:40 ` linux-os (Dick Johnson)
2006-05-02 12:42 ` David Woodhouse
2006-05-02 16:27 ` Christer Weinigel
2006-05-02 12:48 ` Martin Mares
2006-05-02 13:52 ` Avi Kivity
2006-05-02 14:13 ` Al Viro
2006-05-02 14:54 ` Avi Kivity
2006-05-02 16:16 ` Brian Beattie
2006-05-02 16:21 ` Avi Kivity
2006-05-02 13:21 ` Willy Tarreau
2006-05-02 14:41 ` Avi Kivity
2006-05-02 22:25 ` Diego Calleja
2006-05-02 13:34 ` Al Viro
2006-05-02 14:02 ` Avi Kivity
2006-05-02 14:34 ` Al Viro
2006-05-02 15:04 ` Avi Kivity
2006-05-02 15:15 ` Al Viro
2006-05-02 15:19 ` Avi Kivity
2006-05-02 15:27 ` Kyle Moffett
2006-05-02 15:30 ` Avi Kivity
2006-05-02 15:28 ` Al Viro
2006-05-02 15:51 ` Avi Kivity
2006-05-02 15:24 ` Kyle Moffett
2006-05-03 13:13 ` Mark Lord
2006-05-03 20:51 ` David Schwartz
2006-04-30 21:15 ` Eric W. Biederman
2006-04-25 17:54 ` linux-os (Dick Johnson)
2006-04-26 8:30 ` Jan Engelhardt
2006-04-26 11:36 ` linux-os (Dick Johnson)
2006-04-25 19:22 ` Kyle Moffett
2006-04-25 19:54 ` Michael Buesch
2006-04-25 20:24 ` Avi Kivity
2006-04-25 20:11 ` Bongani Hlope
2006-04-25 20:26 ` Avi Kivity
2006-04-25 21:02 ` Valdis.Kletnieks
2006-04-25 21:15 ` Avi Kivity
[not found] ` <71a0d6ff0604251646g4fc90b3dr30a03b8606360e7f@mail.gmail.com>
2006-04-26 4:39 ` Avi Kivity [this message]
2006-04-25 17:55 ` Geert Uytterhoeven
2006-04-24 21:58 ` Alan Cox
2006-04-25 7:20 ` Avi Kivity
2006-04-25 9:06 ` Matt Keenan
2006-04-25 20:29 ` Bongani Hlope
2006-04-25 20:37 ` Avi Kivity
2006-04-25 21:08 ` Bongani Hlope
2006-04-25 4:17 ` Martin J. Bligh
2006-04-25 5:30 ` Avi Kivity
2006-04-25 8:58 ` Sam Ravnborg
2006-04-25 7:56 ` Jakob Oestergaard
2006-04-25 9:03 ` Jan Engelhardt
2006-04-24 21:36 ` J.A. Magallon
[not found] <65eLE-GJ-21@gated-at.bofh.it>
[not found] ` <65zwH-61W-51@gated-at.bofh.it>
[not found] ` <65zZH-6Bw-23@gated-at.bofh.it>
[not found] ` <66grR-2DK-27@gated-at.bofh.it>
2006-04-28 0:03 ` Robert Hancock
2006-04-28 9:37 Khushil Dep
2006-05-02 18:21 Al Boldi
2006-05-02 20:28 ` J.A. Magallon
2006-05-02 23:55 ` Peter Williams
2006-05-03 8:09 ` Steven Rostedt
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=444EF964.30704@argo.co.il \
--to=avi@argo.co.il \
--cc=Valdis.Kletnieks@vt.edu \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=alexander.shishckin@gmail.com \
--cc=bhlope@mweb.co.za \
--cc=linux-kernel@vger.kernel.org \
--cc=mrmacman_g4@mac.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.