Re: [RFC PATCH v3 0/4] Separate thread for VM migration

From: Anthony Liguori <anthony@codemonkey.ws>
To: Umesh Deshpande <udeshpan@redhat.com>
Cc: kvm@vger.kernel.org, quintela@redhat.com, mtosatti@redhat.com,
	pbonzini@redhat.com
Subject: Re: [RFC PATCH v3 0/4] Separate thread for VM migration
Date: Thu, 11 Aug 2011 13:25:30 -0500	[thread overview]
Message-ID: <4E441E9A.4060300@codemonkey.ws> (raw)
In-Reply-To: <cover.1313076455.git.udeshpan@redhat.com>

On 08/11/2011 10:32 AM, 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,
>
> The migration has been moved to a separate thread to
> reduce the qemu_mutex contention and iohandler starvation.

This needs to go to qemu-devel.

Regards,

Anthony Liguori

>
> Umesh Deshpande (4):
>    separate thread for VM migration
>    synchronous migrate_cancel
>    lock to protect memslots
>    separate migration bitmap
>
>   arch_init.c         |   26 ++++++++++----
>   buffered_file.c     |  100 +++++++++++++++++++++++++++++++++------------------
>   buffered_file.h     |    4 ++
>   cpu-all.h           |   39 ++++++++++++++++++++
>   cpus.c              |   12 ++++++
>   exec.c              |   74 +++++++++++++++++++++++++++++++++++++
>   hw/hw.h             |    5 ++-
>   migration.c         |   50 ++++++++++++--------------
>   migration.h         |    6 +++
>   qemu-common.h       |    2 +
>   qemu-thread-posix.c |   10 +++++
>   qemu-thread.h       |    1 +
>   savevm.c            |   31 +++++++++++-----
>   13 files changed, 280 insertions(+), 80 deletions(-)
>