Re: [Qemu-devel] [PATCH v4 03/11] qemu-log: correct help text for -d cpu

From: "Alex Bennée" <alex.bennee@linaro.org>
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>
Subject: Re: [Qemu-devel] [PATCH v4 03/11] qemu-log: correct help text for -d cpu
Date: Tue, 04 Aug 2015 18:22:30 +0100	[thread overview]
Message-ID: <87d1z3klyh.fsf@linaro.org> (raw)
In-Reply-To: <55C0D879.90404@twiddle.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