| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
RE: [Xen-devel] [RFC] Transcendent Memory ("tmem"): a new approach to ph
Hi Alan --
Sorry, I'm not trying to be cryptic. I'm having some network
problems and will try to post the Linux patch shortly.
I'm aware of IBM's CMM and I think (hope) tmem achieves similar
goals but is much much simpler and more extensible for other
interesting uses. After I get the patch posted, let me know
if you agree.
Yes, one of the other uses for tmem is for cluster nodes
co-resident on a physical machine to share a "virtual page
cache". That's under development... working with the ocfs2
team.
Looking forward to more discussion...
Dan
> > Comments and questions welcome. I also plan to submit an
> > abstract for the upcoming Xen summit and, if accepted, give
> > a talk about tmem there.
>
> I assume you've looked at how S/390 handles this problem -
> the guests can
> mark pages as stable or unused and the rest is up to the
> hypervisor ? No
> complex pool interfaces and the resulting interface slots
> into the Linux
> kernel as a pair of 1 liners in existing arch_foo hooks in the mm. The
> S/390 keeps the question of shared/private memory objects
> separate from
> the question of whether they are currently used - a point on which I
> think their model and interface is probably better.
>
> I would look at the patches but the URL you give contains
> nothing but an
> empty repository. I'd be interested to see how the kernel patches look
> and also how you implement migration of some of the users of a shared
> pool object - do you implement a full clustered memory
> manager and what do the
> performance figures look like across networks ? How do you find a pool
> across the network ?
>
> Its interesting as you can do a lot of other interesting
> things with this
> kind of interface. Larry McVoy's bitcluster SMP proposal was
> built on a
> similar idea using refcounted page loans to drive a
> multiprocessor NUMA
> box as a cluster with page sharing.
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home