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    SubjectRe: [PATCH V2 7/9] vhost: do not use RCU to synchronize MMU notifier with worker
    On Sun, Aug 04, 2019 at 04:07:17AM -0400, Michael S. Tsirkin wrote:
    > > > > Also, why can't this just permanently GUP the pages? In fact, where
    > > > > does it put_page them anyhow? Worrying that 7f466 adds a get_user page
    > > > > but does not add a put_page??
    > >
    > > You didn't answer this.. Why not just use GUP?
    > >
    > > Jason
    >
    > Sorry I misunderstood the question. Permanent GUP breaks lots of
    > functionality we need such as THP and numa balancing.

    Really? It doesn't look like that many pages are involved..

    Jason

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