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Date:	Sun, 21 Oct 2007 20:34:57 -0700
From:	Jeremy Fitzhardinge <>
To:	dean gaudet <>
CC:	Nick Piggin <>, David Chinner <>,, Xen-devel <>,
	Linux Kernel Mailing List <>,
	Mark Williamson <>,
	Morten B√łgeskov 
Subject: Re: Interaction between Xen and XFS: stray RW mappings

dean gaudet wrote:
> 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)?

Yes, that's precisely the problem.  xfs does delay the unmap, leaving
stray mappings, which upsets Xen.

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