On Fri, Jan 03, 2014 at 09:49:36AM -0500, Andres Lagar-Cavilla
wrote:>
> On Dec 31, 2013, at 11:31 AM, Tim Deegan <tim@xen.org> wrote:
>
> > At 10:33 -0500 on 31 Dec (1388482410), Konrad Rzeszutek Wilk wrote:
> >> On Mon, Dec 23, 2013 at 06:34:55PM +0000, Russell Pavlicek wrote:
> >>> On Twitter, Florian Heigl sent a out a few messages about
issues with xenpaging:
> >>>
> >>> ---
> >>> 19-Dec: Anyone successfully use
#xen<https://twitter.com/search?q=%23xen&src=hash>
#xenpaging<https://twitter.com/search?q=%23xenpaging&src=hash>? docs
are at SLES manual, rest is mostly this:
http://www.gossamer-threads.com/lists/xen/devel/255798<http://t.co/P36VdL84Et>
dead feature or usable?
> >>>
> >>> 22-Dec: @lars_kurth<https://twitter.com/lars_kurth>
@RCPavlicek<https://twitter.com/RCPavlicek> Hey guys, I wrote down as much
as I could https://piratenpad.de/p/Ik3lOBLniq1L5TEM
<https://t.co/e5LQCUD9d0> (since I'm on holiday and not constant
online)
> >>>
> >>> 22-Dec: Yay, tested
#xen<https://twitter.com/search?q=%23xen&src=hash> Xenpaging (memory
overcommit)
> >>> [x] largely untested
> >>> [x] docs outdated
> >>> [x] syntax+logic changed
> >>> [x] broken
> >>> ---
> >>>
> >>> [I've taken the liberty of removing the colorful expletive
from the final post]
> >>>
> >>> Is Florian's assessment correct, or is there somewhere we
can point him for help? I'm on vacation this week, but if someone replies
to me, I will try to forward the information appropriately.
> >>
> >> The Maintainers file implies otherwise. Let me CC the maintainers.
> >
> > Andres really owns this code, so I'll punt to him for an official
> > answer, but:
> The part actively maintained is the hypervisor support for paging, and the
interface.
>
> tools/xenpaging is one way to consume that interface. It seems to have
suffered from bitrot.
What is the other interface? Thanks!>
> So other than echoing Tim's points below, I'll add
>
> - Some interesting ideas thrown around by Florian in his notes. Could lead
to a robust discussion in xen-devel … if Florian is still interested.
>
> - Perhaps the developers who are interested (myself included) should make a
decent effort at improving the in-tree tools. There is the argument that for
example KSM gives KVM users a sharing solution that just works, whether you like
the results or not. In that vein xenpaging apparently doesn't cut it, nor
the absence of a basic sharing tool.
>
> One simple paging tool could be lazy restore. There is some interest out
there, it would be relatively straightforward to codify.
>
> Andres
> >
> > - It's been listed as a 'tech preview' on the feature list
since it went
> > in. http://wiki.xenproject.org/wiki/Xen_Release_Features says:
> > "Preview, due to limited tools support. Hypervisor side in good
shape."
> >
> > - I can't say anything about SuSE's apparent support for it,
except
> > that ISTR Olaf worked at/for/with SuSE at the time.
> >
> > - Patches would, of course, be welcome.
> >
> > Tim.
>
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