From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.33)
	id 1CH7vm-0006gO-Or
	for qemu-devel@nongnu.org; Mon, 11 Oct 2004 17:42:11 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.33)
	id 1CH7vk-0006fU-RQ
	for qemu-devel@nongnu.org; Mon, 11 Oct 2004 17:42:09 -0400
Received: from [199.232.76.173] (helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.33) id 1CH7vk-0006fR-OF
	for qemu-devel@nongnu.org; Mon, 11 Oct 2004 17:42:08 -0400
Received: from [64.233.170.205] (helo=mproxy.gmail.com)
	by monty-python.gnu.org with esmtp (Exim 4.34) id 1CH7oi-000454-WC
	for qemu-devel@nongnu.org; Mon, 11 Oct 2004 17:34:53 -0400
Received: by mproxy.gmail.com with SMTP id 73so573491rnl
	for <qemu-devel@nongnu.org>; Mon, 11 Oct 2004 14:34:18 -0700 (PDT)
Message-ID: <564d96fb041011143445a2618d@mail.gmail.com>
Date: Mon, 11 Oct 2004 18:34:17 -0300
From: =?ISO-8859-1?Q?Rafael_Esp=EDndola?= <rafael.espindola@gmail.com>
Subject: Re: [Qemu-devel] env in TLS
In-Reply-To: <20041011083228.6907.qmail@web52501.mail.yahoo.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
References: <20041011083228.6907.qmail@web52501.mail.yahoo.com>
Reply-To: =?ISO-8859-1?Q?Rafael_Esp=EDndola?= <rafael.espindola@gmail.com>,
	qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

I have done some experiments in using TLS instead of LDT in the case
of  the code-copying optimization:

http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00206.html
http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00248.html

Hope that it is useful.

Rafael

On Mon, 11 Oct 2004 01:32:28 -0700 (PDT), Piotr Krysik
<piotrek_priv@yahoo.com> wrote:
> Hi!
> 
> Fabrice, how about moving env variable to TLS?
> 
> This could improve performance (based on
> http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00294.html
> 
> about 10% could be gained -- need to verify). Also
> additional register would be available for op.c
> (anyone to implement register renaming?).
> 
> The main problem with this approach is portability.
> AFAIK GCC <= 3.2 doesn't recognize __thread keyword.
> For x86 we could fall-back to the LDT method from
> qemu-fast. How about other platforms? In the worst
> case we could use global variable and forget about
> multi-processor qemu-softmmu and multi-thread in
> qemu-user for some platforms in the future.
> 
> Comments?
> 
> Piotrek
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
>