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SubjectRE: [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap
> 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 ...

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