Re: Interaction between Xen and XFS: stray RW mappings

dean gaudet
2007-10-22T03:18:50Z

On Mon, 15 Oct 2007, Nick Piggin wrote:

> Yes, as Dave said, vmap (more specifically: vunmap) is very expensive
> because it generally has to invalidate TLBs on all CPUs.

why is that? ignoring 32-bit archs we have heaps of address space
available... couldn't the kernel just burn address space and delay global
TLB invalidate by some relatively long time (say 1 second)?

-dean