On Wed, Apr 09, 2014 at 11:18:27AM -0400, Konrad Rzeszutek Wilk wrote: > 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@xxxxxxxxxxxxxxxxxxxx' on it? > Yes I will. Unless the x86 maintainers push for it on the grounds that it is a functional fix for xen, I'm going to wait until after the merge window to resend it. That'd give it some chance of being tested in -next before hitting mainline. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>