Re: [Qemu-devel] [RFC PATCH v5 0/4] Separate thread for VM migration

[Anthony Liguori]

On 08/23/2011 10:12 PM, Umesh Deshpande wrote:
> Following patch series deals with VCPU and iothread starvation during the
> migration of a guest. Currently the iothread is responsible for performing the
> guest migration. It holds qemu_mutex during the migration and doesn't allow VCPU
> to enter the qemu mode and delays its return to the guest. The guest migration,
> executed as an iohandler also delays the execution of other iohandlers.
> In the following patch series,

Can you please include detailed performance data with and without this 
series?

Perhaps runs of migration with jitterd running in the guest.

Regards,

Anthony Liguori

> The migration has been moved to a separate thread to
> reduce the qemu_mutex contention and iohandler starvation.
>
> Umesh Deshpande (4):
>    MRU ram block list
>    migration thread mutex
>    separate migration bitmap
>    separate migration thread
>
>   arch_init.c         |   38 ++++++++++++----
>   buffered_file.c     |   75 +++++++++++++++++--------------
>   cpu-all.h           |   42 +++++++++++++++++
>   exec.c              |   97 ++++++++++++++++++++++++++++++++++++++--
>   migration.c         |  122 +++++++++++++++++++++++++++++---------------------
>   migration.h         |    9 ++++
>   qemu-common.h       |    2 +
>   qemu-thread-posix.c |   10 ++++
>   qemu-thread.h       |    1 +
>   savevm.c            |    5 --
>   10 files changed, 297 insertions(+), 104 deletions(-)