Re: [PATCH V2 7/9] vhost: do not use RCU to synchronize MMU notifier with worker

On Tue, Aug 06, 2019 at 08:53:17AM -0300, Jason Gunthorpe wrote:

On Sun, Aug 04, 2019 at 04:07:17AM -0400, Michael S. Tsirkin wrote:

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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

Yea. But they just might happen to be heavily accessed ones....

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MST