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Message-ID: <alpine.DEB.0.9999.0710212128180.2320@twinlark.arctic.org> Date: Sun, 21 Oct 2007 21:28:32 -0700 (PDT) From: dean gaudet <dean@...tic.org> To: Jeremy Fitzhardinge <jeremy@...p.org> cc: Nick Piggin <nickpiggin@...oo.com.au>, David Chinner <dgc@....com>, xfs@....sgi.com, Xen-devel <xen-devel@...ts.xensource.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Mark Williamson <mark.williamson@...cam.ac.uk>, Morten Bøgeskov <xen-users@...ten.bogeskov.dk>, xfs-masters@....sgi.com Subject: Re: Interaction between Xen and XFS: stray RW mappings On Sun, 21 Oct 2007, Jeremy Fitzhardinge wrote: > 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. sounds like a bug in xen to me :) -dean - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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