Re: Interaction between Xen and XFS: stray RW mappings

On Mon, 15 Oct 2007, Nick Piggin wrote:

quoted text

> 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 -

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