linux-kernel - Re: [xfs-masters] Re: Interaction between Xen and XFS: stray RW mappings

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Message-ID: <20071015083141.GA20851@lst.de>
Date:	Mon, 15 Oct 2007 10:31:41 +0200
From:	Christoph Hellwig <hch@....de>
To:	xfs-masters@....sgi.com
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, David Chinner <dgc@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>, 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 B?geskov <xen-users@...ten.bogeskov.dk>
Subject: Re: [xfs-masters] Re: Interaction between Xen and XFS: stray RW mappings

On Mon, Oct 15, 2007 at 02:25:46PM +1000, David Chinner wrote:
> > Hm, well I saw the problem with a filesystem made with mkfs.xfs with no
> > options, so there must be at least *some* vmapping going on there.
> 
> Sorry - I should have been more precise - vmap should never be used in
> performance critical paths on default configs.  Log recovery will
> trigger vmap/vunmap usage, so this is probably what you are seeing.

The iclogs are also vmapped, but they aren't unmapped until unmount so
this optimizations doesn't matter either.

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