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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

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