Jeremy Maitin-Shepard wrote:
I don't know a whole lot about xen, but it seems that one issue with this approach is that it requires you run your system under a hypervisor at all times, which may introduce some overhead.
No, I don't think that's what Al is proposing. The kernel-internal interfaces we've put in place to make Xen work could be reused to do some of the things you're talking about. In particular, a kernel running under Xen has to be able to deal with non-contiguous physical pages, and reusing the same pagetable hooks would allow a kexeced kernel to run happily out of any random assortment of pages you manage to allocate for it.
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