Re: [Xen-devel] mark pages in p2m_ram_paging_out state read-only

[Olaf Hering <olaf@xxxxxxxxx>]

On Thu, Nov 24, Tim Deegan wrote:

> > Is this a good idea? If the guest is accessing the page, then paging out
> > should stop immediately. We're risking complex races for a tiny tiny gain.
> 
> I don't think that this would introduce any new races, but yes - this is
> probably a hint that this page is a poor candidate to be paged out.
> We might as well abandon the page-out rather than probably having to
> page it back in immediately.

In the current state there will be a stall in the guest due to the
fault, until the page comes back. 
With this change the guest can still make progress. 
Can the read-execute access be detected anyway to stop paging?

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