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Date:	Sun, 21 Oct 2007 20:18:41 -0700 (PDT)
From:	dean gaudet <>
To:	Nick Piggin <>
cc:	Jeremy Fitzhardinge <>, David Chinner <>,, Xen-devel <>,
	Linux Kernel Mailing List <>,
	Mark Williamson <>,
	Morten B√łgeskov <>,
Subject: Re: Interaction between Xen and XFS: stray RW mappings

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)?

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