[XenPPC] Re: HTAB: What I forgot about XenPPC managment

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

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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