| To: | xfs-masters@xxxxxxxxxxx |
|---|---|
| Subject: | [xfs-masters] Re: Interaction between Xen and XFS: stray RW mappings |
| From: | Christoph Hellwig <hch@xxxxxx> |
| Date: | Mon, 15 Oct 2007 10:31:41 +0200 |
| Cc: | Jeremy Fitzhardinge <jeremy@xxxxxxxx>, David Chinner <dgc@xxxxxxx>, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, xfs@xxxxxxxxxxx, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Mark Williamson <mark.williamson@xxxxxxxxxxxx>, Morten B?geskov <xen-users@xxxxxxxxxxxxxxxxxx> |
| In-reply-to: | <20071015042546.GI995458@sgi.com> |
| References: | <470FA7C3.90404@goop.org> <200710151415.07248.nickpiggin@yahoo.com.au> <4712BB05.1020701@goop.org> <200710151726.08387.nickpiggin@yahoo.com.au> <4712E1AA.501@goop.org> <20071015041133.GH995458@sgi.com> <4712EA09.6000102@goop.org> <20071015042546.GI995458@sgi.com> |
| Reply-to: | xfs-masters@xxxxxxxxxxx |
| Sender: | xfs-masters-bounce@xxxxxxxxxxx |
| User-agent: | Mutt/1.3.28i |
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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