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From: Eric Blake <eblake@redhat.com>
To: Vladimir Sementsov-Ogievskiy <vsementsov@parallels.com>,
	qemu-devel@nongnu.org
Cc: kwolf@redhat.com, den@openvz.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH] block-migration: fix pending() return value
Date: Thu, 11 Dec 2014 08:07:31 -0700	[thread overview]
Message-ID: <5489B333.8060502@redhat.com> (raw)
In-Reply-To: <1418298924-4173-2-git-send-email-vsementsov@parallels.com>

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On 12/11/2014 04:55 AM, Vladimir Sementsov-Ogievskiy wrote:
> Because of wrong return value of .save_live_pending() in
> block-migration, migration finishes before the whole disk
> is transferred. Such situation occures when the migration

s/occures/occurs/

> process is fast enouth, for example when source and dest

s/enouth/enough/

> are on the same host.
> 
> If in the bulk phase we return something < max_size, we will skip
> transferring the tail of the device. Currently we have "set pending to
> BLOCK_SIZE if it is zero" for bulk phase, but there no guarantee, that
> it will be < max_size.
> 
> True approach is to return, for example, max_size+1 when we are in the
> bulk phase.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@parallels.com>
> ---
>  block-migration.c | 4 ++--

I'll let someone else review the code proper.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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  reply	other threads:[~2014-12-11 15:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-11 11:55 [Qemu-devel] [PATCH] Fix block migration bug Vladimir Sementsov-Ogievskiy
2014-12-11 11:55 ` [Qemu-devel] [PATCH] block-migration: fix pending() return value Vladimir Sementsov-Ogievskiy
2014-12-11 15:07   ` Eric Blake [this message]
2014-12-19 11:44     ` Vladimir Sementsov-Ogievskiy
2015-01-29  7:58       ` Markus Armbruster
2015-01-29  8:35         ` Vladimir Sementsov-Ogievskiy

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