Xen project Mailing List

HI Jan,

... new Xenbus node. Without (so far) a true view into the
host topology, even if you added a respective consumer to the
balloon driver, how would that driver honor such a request?
And even if it knew about host topology, unless the virtual
topology in the subject domain sufficiently closely resembled the
host's, it would - afaict - still have no way of obtaining suitable
memory from the page allocator.

Do you mean the kernel part?
The modification of kernel is here: http://lists.xenproject.org/archives/html/xen-devel/2013-08/msg01179.html

I still haven't find out how to generate two patches in one time....So I have to send two email, sorry

On Mon, Aug 12, 2013 at 10:00 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:

>>> On 12.08.13 at 15:18, Yechen Li <lccycc123@xxxxxxxxx> wrote:
> This small patch implements a numa support of memory operation for libxl
> The command is: xl mem-set-numa [-e] vmid memorysize nodeid
> To pass the parameters to balloon driver in kernel, I add a file of
> xen-store
> as /local/domain/(id)/memory/target_nid, hoping this is ok....
>
> It's my first time submitting a patch, please point out the problems so
> that I could work better in future, thanks very much!

The main problem here is the lack of a consumer of this ...

> @@ -3754,7 +3761,10 @@ retry_transaction:
> abort_transaction = 1;
> goto out;
> }
> -
> + //lcc:
> + LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "target_nid = %d focus= %d", node_specify, (int) nodeexact);
> + libxl__xs_write(gc, t, libxl__sprintf(gc, "%s/memory/target_nid",
> + dompath), "%"PRId32" %"PRId32, node_specify, (int)nodeexact);

... new Xenbus node. Without (so far) a true view into the
host topology, even if you added a respective consumer to the
balloon driver, how would that driver honor such a request?
And even if it knew about host topology, unless the virtual
topology in the subject domain sufficiently closely resembled the
host's, it would - afaict - still have no way of obtaining suitable
memory from the page allocator.

Jan

Yechen Li

Team of System Virtualization and Cloud Computing
School of Electronic Engineering and Computer Science,
Peking University, China

Nothing is impossible because impossible itself says: " I'm possible "

lccycc From PKU

Re: [Xen-devel] [PATCH v1][RFC] xen balloon driver numa support, libxl interface