From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Arjan van de Ven <arjan@infradead.org>,
akpm@osdl.org, ak@suse.de, linux-kernel@vger.kernel.org,
Michael.Fetterman@cl.cam.ac.uk,
Ian Campbell <Ian.Campbell@XenSource.com>
Subject: Re: i386 PDA patches use of %gs
Date: Wed, 13 Sep 2006 11:59:42 +0200 [thread overview]
Message-ID: <20060913095942.GA10075@elte.hu> (raw)
In-Reply-To: <45075829.701@goop.org>
* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> [...] The basic inner loop is:
>
> push %segreg
> mov %selectorreg, %segreg
> add $1,%segreg:offset # use the segment register
> pop %segreg
well, the most important thing i believe you didnt test: the effect of
mixing two descriptors on the _same_ selector: one %gs selector value
loaded and used by glibc, and another %gs selector value loaded and used
by the kernel, intermixed. It's the mixing that causes the descriptor
cache reload. (unless i missed some detail about your testcase)
Ingo
next prev parent reply other threads:[~2006-09-13 10:08 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-12 7:35 Arjan van de Ven
2006-09-12 7:48 ` Jeremy Fitzhardinge
2006-09-12 7:56 ` Arjan van de Ven
2006-09-12 8:31 ` Jeremy Fitzhardinge
2006-11-15 11:27 ` [PATCH] i386-pda UP optimization Eric Dumazet
2006-11-15 11:32 ` Andi Kleen
2006-11-15 17:20 ` Ingo Molnar
2006-11-15 17:24 ` Andi Kleen
2006-11-15 17:46 ` Eric Dumazet
2006-11-15 17:49 ` Ingo Molnar
2006-11-15 17:58 ` Eric Dumazet
2006-11-15 18:01 ` Ingo Molnar
2006-11-21 11:38 ` Eric Dumazet
2006-11-21 21:42 ` Jeremy Fitzhardinge
2006-11-21 21:52 ` Andi Kleen
2006-11-21 22:10 ` Jeremy Fitzhardinge
2006-11-21 21:58 ` Eric Dumazet
2006-11-21 23:12 ` Jeremy Fitzhardinge
2006-11-15 17:28 ` Jeremy Fitzhardinge
2006-11-15 17:32 ` Ingo Molnar
2006-11-15 17:59 ` Jeremy Fitzhardinge
2006-11-15 18:05 ` Eric Dumazet
2006-11-15 18:28 ` Jeremy Fitzhardinge
2006-11-15 18:31 ` Ingo Molnar
2006-11-15 18:01 ` Arjan van de Ven
2006-11-15 18:24 ` Jeremy Fitzhardinge
2006-11-15 19:06 ` Ingo Molnar
2006-11-17 0:24 ` Jeremy Fitzhardinge
2006-11-15 17:52 ` Jeremy Fitzhardinge
2006-11-28 23:12 ` Jeremy Fitzhardinge
2006-11-29 9:30 ` Eric Dumazet
2006-11-29 9:56 ` Jeremy Fitzhardinge
2006-09-13 1:00 ` i386 PDA patches use of %gs Jeremy Fitzhardinge
2006-09-13 9:59 ` Ingo Molnar [this message]
2006-09-13 16:17 ` Jeremy Fitzhardinge
2006-11-15 18:26 ` Ingo Molnar
2006-11-15 18:29 ` Ingo Molnar
2006-11-15 18:43 ` Jeremy Fitzhardinge
2006-11-15 18:44 ` Ingo Molnar
2006-11-15 18:39 ` Jeremy Fitzhardinge
2006-11-15 18:43 ` Ingo Molnar
2006-11-15 18:49 ` Jeremy Fitzhardinge
2006-11-15 18:49 ` Ingo Molnar
2006-11-15 19:00 ` Jeremy Fitzhardinge
2006-11-15 19:03 ` Ingo Molnar
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=20060913095942.GA10075@elte.hu \
--to=mingo@elte.hu \
--cc=Ian.Campbell@XenSource.com \
--cc=Michael.Fetterman@cl.cam.ac.uk \
--cc=ak@suse.de \
--cc=akpm@osdl.org \
--cc=arjan@infradead.org \
--cc=jeremy@goop.org \
--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
Powered by JetHome