[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Xen balloon driver improvement (version 1)

On Wed, 2014-10-22 at 19:29 +0100, Wei Liu wrote:

> > > For instance, balloon driver can maintain three queues:
> > >
> > > 1. queue for 2 MB pages
> > > 1. queue for 4 KB pages (delegated to core balloon driver)
> > > 1. queue for pages used to mapped pages from other domain
> > 
> > What about 1GB pages?
> > 
> I wouldn't bother with 1GB pages here.

Guests which don't have special privileges are limited to 2M contiguous
allocations anyway, to stop them from consuming "precious" higher order

I'm not sure that's still worthwhile (e.g. is it valid on ARM or
shadow/HAP x86? I'm not sure).

> It would require too much work to coalesce 4KB pages to 1GB pages. 

FWIW in practice You'd probably coalesce 4K pages into 2M  and then 2M
into 1G.

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.