Re: [Xen-devel] Any work on sharing of large multi-page segments?

2015-03-17 Thread Andrew Warkentin
On 3/17/15, Jan Beulich wrote: > And how would that be significantly different from the batching > that's already built into the grant table hypercall? > I guess it does do more or less what I want already. I was looking more at the inner mapping/unmapping functions, rather than the wrappers aroun

Re: [Xen-devel] Any work on sharing of large multi-page segments?

2015-03-16 Thread Andrew Warkentin
On 3/16/15, Jan Beulich wrote: > So where do you expect the major performance / scalability > improvement to be gained? Internally to Xen, each page will need > to be tracked separately anyway, as what appears physically > contiguous in the granting guest may (and likely will) not be > contiguous

[Xen-devel] Any work on sharing of large multi-page segments?

2015-03-15 Thread Andrew Warkentin
Has anyone done any work on sharing of large multiple-page segments between domains? The current grant table implementation is unsuitable for this because it only allows sharing single pages and is limited to a relatively small number of entries (and passing large numbers of single-page grant r