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From: Richard Henderson <rth@twiddle.net>
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Date: Tue, 4 Aug 2015 11:09:38 -0700
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Subject: Re: [Qemu-devel] [PATCH v4 03/11] qemu-log: correct help text for
 -d cpu
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To: =?UTF-8?Q?Alex_Benn=c3=a9e?= <alex.bennee@linaro.org>
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>

On 08/04/2015 10:22 AM, Alex Bennée wrote:
> 
> 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?


That's what I'm saying -- probably a separate debug option is better.


r~