From: Andi Kleen <andi@firstfloor.org>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andi Kleen <andi@firstfloor.org>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [patch 9/9] Scheduler profiling - Use conditional calls
Date: Fri, 1 Jun 2007 00:33:22 +0200 [thread overview]
Message-ID: <20070531223322.GC7217@one.firstfloor.org> (raw)
In-Reply-To: <20070531220742.GG904@Krystal>
> I see your point, but there is a level of control on the branch I would
> lack by doing so: the ability to put the call in either the if or else
> branch. It is an optimization on i386.
What does it optimize exactly?
> Also, I live in the expectation that, someday, the gcc guys will be nice
> enough to add some kind of support for a nop-based jump that would
> require code patching to put a jump instead. If it ever happens, my
> macro could evolve into this for newer compiler versions, which I could
> not do with the if() statement you are proposing.
If that ever happens we couldn't use it anyways because Linux still
has to support old compilers for a long time. And when those are dropped the
code could be updated.
-Andi
next prev parent reply other threads:[~2007-05-31 22:33 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-30 14:00 [patch 0/9] Conditional Calls - for 2.6.22-rc2-mm1 Mathieu Desnoyers
2007-05-30 14:00 ` [patch 1/9] Conditional Calls - Architecture Independent Code Mathieu Desnoyers
2007-05-30 20:32 ` Andrew Morton
2007-05-31 16:34 ` Mathieu Desnoyers
2007-05-31 13:47 ` Andi Kleen
2007-06-05 18:40 ` Mathieu Desnoyers
2007-06-04 19:01 ` Adrian Bunk
2007-06-13 15:57 ` Mathieu Desnoyers
2007-06-13 21:51 ` Adrian Bunk
2007-06-14 16:02 ` Mathieu Desnoyers
2007-06-14 21:06 ` Adrian Bunk
2007-06-20 21:59 ` Mathieu Desnoyers
2007-06-21 13:00 ` Adrian Bunk
2007-06-21 13:55 ` Mathieu Desnoyers
2007-05-30 14:00 ` [patch 2/9] Conditional Calls - Hash Table Mathieu Desnoyers
2007-05-30 20:32 ` Andrew Morton
2007-05-31 13:42 ` Andi Kleen
2007-06-01 16:08 ` Matt Mackall
2007-06-01 16:46 ` Mathieu Desnoyers
2007-06-01 17:07 ` Matt Mackall
2007-06-01 17:45 ` Andi Kleen
2007-06-01 18:06 ` Mathieu Desnoyers
2007-06-01 18:49 ` Matt Mackall
2007-06-01 19:35 ` Andi Kleen
2007-06-01 20:33 ` Mathieu Desnoyers
2007-06-01 20:44 ` Andi Kleen
2007-06-04 22:26 ` Mathieu Desnoyers
2007-06-01 18:03 ` Mathieu Desnoyers
2007-05-30 14:00 ` [patch 3/9] Conditional Calls - Non Optimized Architectures Mathieu Desnoyers
2007-05-30 14:00 ` [patch 4/9] Conditional Calls - Add kconfig menus Mathieu Desnoyers
2007-05-30 14:00 ` [patch 5/9] Conditional Calls - i386 Optimization Mathieu Desnoyers
2007-05-30 20:33 ` Andrew Morton
2007-05-31 13:54 ` Andi Kleen
2007-06-05 19:02 ` Mathieu Desnoyers
2007-05-30 14:00 ` [patch 6/9] Conditional Calls - PowerPC Optimization Mathieu Desnoyers
2007-05-30 14:00 ` [patch 7/9] Conditional Calls - Documentation Mathieu Desnoyers
2007-05-30 14:00 ` [patch 8/9] F00F bug fixup for i386 - use conditional calls Mathieu Desnoyers
2007-05-30 20:33 ` Andrew Morton
2007-05-31 21:07 ` Mathieu Desnoyers
2007-05-31 21:21 ` Andrew Morton
2007-05-31 21:38 ` Mathieu Desnoyers
2007-05-30 14:00 ` [patch 9/9] Scheduler profiling - Use " Mathieu Desnoyers
2007-05-30 20:34 ` Andrew Morton
2007-06-01 15:54 ` Mathieu Desnoyers
2007-06-01 16:19 ` Andrew Morton
2007-06-01 16:33 ` Mathieu Desnoyers
2007-05-30 20:59 ` William Lee Irwin III
2007-05-31 21:12 ` Mathieu Desnoyers
2007-05-31 23:41 ` William Lee Irwin III
2007-06-04 22:20 ` Mathieu Desnoyers
2007-05-30 21:44 ` Matt Mackall
2007-05-31 21:36 ` Mathieu Desnoyers
2007-05-31 13:39 ` Andi Kleen
2007-05-31 22:07 ` Mathieu Desnoyers
2007-05-31 22:33 ` Andi Kleen [this message]
2007-06-04 22:20 ` Mathieu Desnoyers
-- strict thread matches above, loose matches on Subject: below --
2007-05-29 18:33 [patch 0/9] Conditional Calls Mathieu Desnoyers
2007-05-29 18:34 ` [patch 9/9] Scheduler profiling - Use conditional calls Mathieu Desnoyers
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=20070531223322.GC7217@one.firstfloor.org \
--to=andi@firstfloor.org \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@polymtl.ca \
/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