From: George Dunlap <george.dunlap@eu.citrix.com>
To: Dario Faggioli <raistlin@linux.it>
Cc: "Zhang, Yang Z" <yang.z.zhang@intel.com>,
Andre Przywara <andre.przywara@amd.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH 2 of 2 RFC] xl: allow for moving the domain's memory when changing vcpu affinity
Date: Fri, 6 Jul 2012 15:07:17 +0100 [thread overview]
Message-ID: <4FF6F115.1070106@eu.citrix.com> (raw)
In-Reply-To: <1341583550.15708.47.camel@Abyss>
On 06/07/12 15:05, Dario Faggioli wrote:
> On Fri, 2012-07-06 at 14:25 +0100, Ian Campbell wrote:
>> We could do something cleverer for HVM (or hybrid) guests to migrate
>> pages while the guest is live but migrating a page under a PV guest's
>> feet requires quiescing it in the style of a migrate.
>>
> Which, as we're talking about the same host, means reaching a point
> where I have two full copies of the guest memory in RAM, or not?
>
> (Just trying to figure out if I understood things sensibly).
No, you can do batches at a time, based on how much free memory you
have. If you have enough free memory to keep two copies in RAM at a
time, you might as well. But even as little as moving 1MB at a time
would probably be easily achievable and not to much overhead.
-George
next prev parent reply other threads:[~2012-07-06 14:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-06 9:54 [PATCH 0 of 2 RFC] xl: move domeins among NUMA nodes Dario Faggioli
2012-07-06 9:54 ` [PATCH 1 of 2 RFC] xl: parse extra_config options even when restoring Dario Faggioli
2012-07-06 9:54 ` [PATCH 2 of 2 RFC] xl: allow for moving the domain's memory when changing vcpu affinity Dario Faggioli
2012-07-06 12:53 ` George Dunlap
2012-07-06 13:25 ` Ian Campbell
2012-07-06 13:30 ` George Dunlap
2012-07-06 13:38 ` Ian Campbell
2012-07-06 14:05 ` Dario Faggioli
2012-07-06 14:07 ` George Dunlap [this message]
2012-07-06 14:42 ` Ian Campbell
2012-07-06 13:57 ` Dario Faggioli
2012-07-06 14:04 ` George Dunlap
2012-07-06 14:14 ` Dario Faggioli
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