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xen-ppc-devel
[XenPPC] Re: HTAB: What I forgot about XenPPC managment
On Aug 14, 2006, at 1:20 PM, Hollis Blanchard wrote:
On Sun, 2006-08-13 at 13:55 -0400, Jimi Xenidis wrote:
We need to manage the domain's htab. Ithink we need the following:
- an htab_size variable in the domain script, default being 1/64th
of memory.
- a Dom0 Op to specify the size when we create a domain
- devtree entry, should we reuse the PAPR property like we
currently do or add our own in /xen? I say we add.
When you say "manage", do you mean you think the hash table size
should
be user-controllable?
Dom0-manager-controllable, yes.
Currently we allocate the htab as part of creation, unfortunately
that is before we know how much memory beyond the RMA we will give
the domain. I think the easiest thing to do is to explicitly specify
the htab "order" size using a dom0 op from the management side, for
now the default (yet XM/xend/libx specified is fine). this will
result in Xen calling htab_alloc() with the right order.
Is this something we need to worry about in the
near future, or a nice-to-have?
It is not necessary until we give memory beyond RMA, which will is
the next step IMHO after we find all of memory.
What is "nice-to-have" is the ability for the domain-script to
override the default.
-JX
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