From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:54457)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <alex.bennee@linaro.org>) id 1ZMfvA-0004bv-DZ
	for qemu-devel@nongnu.org; Tue, 04 Aug 2015 13:22:42 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <alex.bennee@linaro.org>) id 1ZMfv7-0002zc-7a
	for qemu-devel@nongnu.org; Tue, 04 Aug 2015 13:22:36 -0400
Received: from mail-wi0-f174.google.com ([209.85.212.174]:35999)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <alex.bennee@linaro.org>) id 1ZMfv7-0002zS-1f
	for qemu-devel@nongnu.org; Tue, 04 Aug 2015 13:22:33 -0400
Received: by wicgj17 with SMTP id gj17so160005013wic.1
	for <qemu-devel@nongnu.org>; Tue, 04 Aug 2015 10:22:32 -0700 (PDT)
References: <1438593291-27109-1-git-send-email-alex.bennee@linaro.org>
	<1438593291-27109-4-git-send-email-alex.bennee@linaro.org>
	<20150804121616.GA8192@aurel32.net> <87h9ofks0j.fsf@linaro.org>
	<CAFEAcA9o7TOHEr_Uojan-uYWhvBpniYzG9hxG6102CAg+uWiwg@mail.gmail.com>
	<55C0D879.90404@twiddle.net>
From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
In-reply-to: <55C0D879.90404@twiddle.net>
Date: Tue, 04 Aug 2015 18:22:30 +0100
Message-ID: <87d1z3klyh.fsf@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Subject: Re: [Qemu-devel] [PATCH v4 03/11] qemu-log: correct help text for
	-d cpu
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Richard Henderson <rth@twiddle.net>
Cc: Peter Maydell <peter.maydell@linaro.org>, QEMU Trivial <qemu-trivial@nongnu.org>, QEMU Developers <qemu-devel@nongnu.org>, Peter Crosthwaite <crosthwaitepeter@gmail.com>, Paolo Bonzini <pbonzini@redhat.com>, Aurelien Jarno <aurelien@aurel32.net>


Richard Henderson <rth@twiddle.net> writes:

> On 08/04/2015 08:15 AM, Peter Maydell wrote:
>> On 4 August 2015 at 16:11, Alex Bennée <alex.bennee@linaro.org> wrote:
>>> Aurelien Jarno <aurelien@aurel32.net> writes:
>>>> On 2015-08-03 10:14, Alex Bennée wrote:
>>>> In practice this is not true for linked TB. Should we also disable TB
>>>> linking when this option is enabled?
>>>
>>> Good question. I suspect yes because if you've gone to level of wanting
>>> exec tracing you'll probably get confused by the chaining. Of course it
>>> will run a lot slower then.
>> 
>> Unless the bug you were trying to track down is caused by the exec
>> chaining, of course... But yes, I think we get more people wanting
>> chaining to be disableable.
>> 
>> Not sure we want to tie it to the 'cpu' debug option, though -- it
>> applies just as much to 'exec'.
>
> Does it make more sense to have a 'nochain' debug option, and not tie it to
> either 'cpu' or 'exec'?  It might be occasionally useful on its own, simply to
> determine if a bug does exist in the exec chaining.

Would that make sense as a debug option or should we have a specific set
of TCG options to alter its behaviour?

>
>
> r~

-- 
Alex Bennée