Re: Page host virtual assist patches.

[Andrew Morton <akpm@osdl.org>]

Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
>
>  The basic idea of host virtual assist (hva) is to give a host system
>  which virtualizes the memory of its guest systems on a per page basis
>  usage information for the guest pages. The host can then use this
>  information to optimize the management of guest pages, in particular
>  the paging. This optimizations can be used for unused (free) guest
>  pages, for clean page cache pages, and for clean swap cache pages.

This is pretty significant stuff.  It sounds like something which needs to
be worked through with other possible users - UML, Xen, vware, etc.

How come the reclaim has to be done in the host?  I'd have thought that a
much simpler approach would be to perform a host->guest upcall saying
either "try to free up this many pages" or "free this page" or "free this
vector of pages"?

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