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    SubjectRe: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels
    On Tue, Apr 08, 2014 at 05:51:23PM +0100, Mel Gorman wrote:
    > On Tue, Apr 08, 2014 at 12:02:50PM -0400, Konrad Rzeszutek Wilk wrote:
    > > .snip..
    > > > >>> David Vrabel has a patchset which I presumed would be pulled through
    > > > >the
    > > > >>> Xen tree this merge window:
    > > > >>>
    > > > >>> [PATCHv5 0/8] x86/xen: fixes for mapping high MMIO regions (and
    > > > >remove
    > > > >>> _PAGE_IOMAP)
    > > > >>>
    > > > >>> That frees up this bit.
    > > > >>>
    > > > >>
    > > > >> Thanks, I was not aware of that patch. Based on it, I intend to
    > > > >force
    > > > >> automatic NUMA balancing to depend on !XEN and see what the reaction
    > > > >is. If
    > > > >> support for Xen is really required then it potentially be re-enabled
    > > > >if/when
    > > > >> that series is merged assuming they do not need the bit for something
    > > > >else.
    > > > >>
    > > > >
    > > > >Amazon EC2 does have large memory instance types with NUMA exposed to
    > > > >the guest (e.g. c3.8xlarge, i2.8xlarge, etc), so it'd be preferable
    > > > >(to me anyway) if we didn't require !XEN.
    > >
    > > What about the patch that David Vrabel posted:
    > >
    > > http://osdir.com/ml/general/2014-03/msg41979.html
    > >
    > > Has anybody taken it for a spin?
    >
    > Alternatively "[PATCH 4/5] mm: use paravirt friendly ops for NUMA
    > hinting ptes" which modifies the NUMA pte helpers instead of the main
    > set/clear ones.

    Ah nice! Looking forward to it being posted as non-RFC and could you also
    please CC 'xen-devel@lists.xenproject.org' on it?

    Thank you!


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