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Re: [Qemu-devel] memory trace with qemu


From: Yufei Chen
Subject: Re: [Qemu-devel] memory trace with qemu
Date: Sat, 24 Jul 2010 10:17:17 +0800

On Fri, Jul 23, 2010 at 2:15 PM, Stefan Hajnoczi <address@hidden> wrote:
> On Fri, Jul 23, 2010 at 4:12 AM, Mulyadi Santosa
> <address@hidden> wrote:
>> Hi...
>>
>> On Fri, Jul 23, 2010 at 05:30, Eduardo Cruz <address@hidden> wrote:
>>> Hello, I need qemu to keep track of all the memory access made by the guest,
>>> including read, write and the instruction fetches.

I don't think Qemu can provide cycle number information. But other
information are all available.

>>
>> AFAIK there are lots of experiments on this and has produces working
>> patches...at least from the posting of the creator. There is even a
>> patch floating to start creating trace framework a while ago.
>
> Thanks Mulyadi, I think you are referring to the tracing work that
> Prerna Saxena and I are doing.  Here is the documentation:
>
> http://repo.or.cz/w/qemu/stefanha.git/blob/tracing:/docs/tracing.txt
>
> The patches apply to qemu.git.  You can define trace events in the
> trace-events file and then call them from places in the code.  There
> is a script to pretty-print the binary trace file that QEMU produces.
>
> Eduardo, if you think this might be what you're looking for, please
> give it a try.  I am on #qemu and #kvm IRC if you need any help.  Any
> feedback will be valuable to us as we prepare these patches for
> submission to qemu.git.
>
> I believe the tracing framework answers the "Any ideas of how I can
> record these information with qemu?" part of your question :).  I
> don't have experience in the TCG, so I can't give advice on how to
> best get at the memory accesses, but I hope this helps you one step
> further.
>

Can this framework trace memory access event? I guess this would be
more difficult to do in KVM than in TCG.

> Stefan
>
>> perhaps you could dig a little deeper in qemu archieve....?
>>
>> --
>> regards,
>>
>> Mulyadi Santosa
>> Freelance Linux trainer and consultant
>>
>> blog: the-hydra.blogspot.com
>> training: mulyaditraining.blogspot.com
>>
>>
>
>



-- 
Best regards,
Chen Yufei



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