Re: [Qemu-devel] Qemu live migration code

[Bechir Bani]

 Hi ,

There is someone who can explain to me the role of two trace points in the file Migration.c 

The trace points are :

   migrate_pending : what are the attributes pending size and max ?

   migrate_transferred: what are the attributes transferred , time_spent , bandwidth and max_size ?

Thank you !

2014-03-25 6:03 GMT-04:00 Sanidhya Kashyap <address@hidden>:

On Tue, Mar 25, 2014 at 2:10 AM, Bechir Bani <address@hidden> wrote:

Hi Sanidhya,

Which function in savevm.c can tell me about the stop time ? 

the migration thread function in migration.c file which has function name - qemu_savevm_state_complete will get executed in the stop and copy phase.

 

2014-03-24 13:46 GMT-04:00 Sanidhya Kashyap <address@hidden>:

savevm.c will tell you about the stop time.

arch_init.c (ram_save_block) will tell about the number of pages transferred.

On Mon, Mar 24, 2014 at 10:51 PM, Bechir Bani <address@hidden> wrote:

I have a task to add trace points in the source code of Qemu. The goal is to know the number of pages transferred at each iteration and stop time of the machine as well.

2014-03-24 12:50 GMT-04:00 Dr. David Alan Gilbert <address@hidden>:

* Bechir Bani (address@hidden) wrote:
> Hi,
>
> I want to know the source code of qemu which is responsible for the
> migration of virtual machines, more precisely where the part of the code
> that describes the stages of memory transfer. is that you can help me?

It's split around a few files; memory is mostly in arch_init.c;
It's something like:

   migration.c       Overall management
      savevm.c
        qemu-file.c    File buffering/bytes on the wire
        vmstate.c      Structured saving of individual devices
        arch_init.c    RAM special code, and a few other things

What are you trying to do/change?

Dave

--
Dr. David Alan Gilbert / address@hidden / Manchester, UK

--

Béchir Bani 

**************************************************************

Ecole Polytechnique de Montréal 

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Laboratoire DORSAL

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Montréal - Canada

--

Béchir Bani 

**************************************************************

Ecole Polytechnique de Montréal 

**************************************************************

Laboratoire DORSAL

***************************************************************

Montréal - Canada

--

Béchir Bani 

**************************************************************

Ecole Polytechnique de Montréal 

**************************************************************

Laboratoire DORSAL

***************************************************************

Montréal - Canada