Re: [Xen-devel] [PATCH RFC 00/10] Xen balloon page compaction support

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Oct 15, 2014 at 05:25:41PM +0100, David Vrabel wrote:
> On 15/10/14 16:54, Wei Liu wrote:
> > Hi all
> > 
> > This is a prototype to make Xen balloon driver work with balloon page
> > compaction. The goal is to reduce guest physical address space fragmentation
> > introduced by balloon pages. Having guest physical address space as 
> > contiguous
> > as possible is generally useful (because guest can have higher order 
> > pages), and
> > it should also help improve HVM performance (provided that guest kernel 
> > knows
> > how to use huge pages -- Linux has hugetlbfs and transparent huge page).
> > 
> > The approach is simple. Core balloon driver is made one of the page sources 
> > of
> > Xen balloon driver. Those pages allocated from core balloon driver are 
> > subject
> > to balloon page compaction.
> 
> Your page migrate function is broken.  I'm not going to review anything
> else in this series until you propose a solution for this.
> 

What do you think about this idea in general? That's what I care at this
point. You can skip reviewing at the moment.

Wei.

> David

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