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

Christoph Hellwig
2007-10-15T08:33:09Z

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.