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Date: Mon, 15 Oct 2007 14:11:33 +1000 From: David Chinner <dgc@....com> 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, Oct 14, 2007 at 08:42:34PM -0700, Jeremy Fitzhardinge wrote: > Nick Piggin wrote: > > That's not going to > > happen for at least a cycle or two though, so in the meantime maybe > > an ifdef for that XFS vmap batching code would help? > > > > For now I've proposed a patch to simply eagerly vunmap everything when > CONFIG_XEN is set. It certainly works, but I don't have a good feel for > how much of a performance hit that imposes on XFS. With defaults - little effect as vmap should never be used. It's only when you start using larger block sizes for metadata that this becomes an issue. The CONFIG_XEN workaround should be fine until we get a proper vmap cache.... Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - 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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