Re: [Qemu-devel] [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap

[Li, Liang Z]

> On Tue, 2016-04-19 at 15:02 +0000, Li, Liang Z wrote:
> > >
> > > On Tue, 2016-04-19 at 22:34 +0800, Liang Li wrote:
> > > >
> > > > The free page bitmap will be sent to QEMU through virtio interface
> > > > and used for live migration optimization.
> > > > Drop the cache before building the free page bitmap can get more
> > > > free pages. Whether dropping the cache is decided by user.
> > > >
> > > How do you prevent the guest from using those recently-freed pages
> > > for something else, between when you build the bitmap and the live
> > > migration completes?
> > Because the dirty page logging is enabled before building the bitmap,
> > there is no need to prevent the guest from using the recently-freed
> > pages ...
> 
> Fair enough.
> 
> It would be good to have that mentioned in the changelog.

Yes, I will. Thanks!

Liang