RE: [Xen-devel] [PATCH 00/11] PV NUMA Guests

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Could you comment on if/how these work when memory is more
dynamically allocated (e.g. via an active balloon driver
in a guest)?  Specifically, I'm wondering if you are running
multiple domains, all are actively ballooning, and there
is a mix of guest NUMA policies, how do you ensure that
non-CONFINE'd domains don't starve a CONFINE'd domain?

Thanks,
Dan

> -----Original Message-----
> From: Dulloor [mailto:dulloor@xxxxxxxxx]
> Sent: Sunday, April 04, 2010 1:30 PM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Keir Fraser
> Subject: [Xen-devel] [PATCH 00/11] PV NUMA Guests
> 
> The set of patches implements virtual NUMA-enlightenment to support
> NUMA-aware PV guests. In more detail, the patch implements the
> following :
> 
> * For the NUMA systems, the following memory allocation strategies are
> implemented :
>  - CONFINE : Confine the VM memory allocation to a single node. As
> opposed to the current method of doing this in python, the patch
> implements this in libxc(along with other strategies) and with
> assurance that the memory actually comes from the selected node.
> - STRIPE : If the VM memory doesn't fit in a single node and if the VM
> is not compiled with guest-numa-support, the memory is allocated
> striped across a selected max-set of nodes.
> - SPLIT : If the VM memory doesn't fit in a single node and if the VM
> is compiled with guest-numa-support, the memory is allocated split
> (equally for now) from the min-set of nodes. The  VM is then made
> aware of this NUMA allocation (virtual NUMA enlightenment).
> -DEFAULT : This is the existing allocation scheme.
> 
> * If the numa-guest support is compiled into the PV guest, we add
> numa-guest-support to xen features elfnote. The xen tools use this to
> determine if SPLIT strategy can be applied.
> 
> * The PV guest uses the virtual NUMA enlightenment to setup its NUMA
> layout (at the time of initmem_init)
> 
> Please comment.
> 
> -dulloor
> 
> Signed-off-by: Dulloor Rao <dulloor@xxxxxxxxxx>
> 
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