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RE: [Xen-users] memory hotplug for guests?

  • To: "Tomasz Chmielewski" <mangoo@xxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Wed, 4 Apr 2007 13:01:36 +0200
  • Delivery-date: Wed, 04 Apr 2007 04:00:54 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acd2qDGpVIaA5wFbTEKrKtNVVbqTDwAABtpw
  • Thread-topic: [Xen-users] memory hotplug for guests?


> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Tomasz Chmielewski
> Sent: 04 April 2007 11:57
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] memory hotplug for guests?
> Does Xen allow something like "memory hotplug" for its guests?
> For example, lets says you are running several guests, and 
> would like to 
> start yet another one for a while - but have no free memory left.
> So you simply "hotplug remove" memory from a guest that has a lot of 
> free memory left - and start a new guest.
> When that new guest is no longer needed, and is stopped, you can 
> "hotplug add" memory to the guest it was previously removed from.

Yes, for para-virtual domains you can use the "balloon driver" to do
this. Obviously, HVM-guests aren't (generally speaking) able to support
memory hotplug/unplug as readily (and the interface for these operations
are generally proprietary to the particular platform, and Xen doesn't
support this, AFAIK). 

"xm mem-set domain amount" is the command for doing this in para-virtual

> Is it possible with Xen? If not, is such a feature planned?
> -- 
> Tomasz Chmielewski
> http://wpkg.org
> _______________________________________________
> Xen-users mailing list
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> http://lists.xensource.com/xen-users

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