Re: [ckrm-tech] Virtual NUMA machine and CKRM

[Dave Hansen <haveblue@us.ibm.com>]

On Fri, 2005-05-27 at 22:16 +0900, Hirokazu Takahashi wrote:
> Why don't you implement CKRM memory controller as virtual NUMA
> node.
> 
> I think what you want do is almost what NUMA code does, which
> restricts resources to use. If you define virtual NUMA node with
> some memory and some virtual CPUs, you can just assign target jobs
> to them.
> 
> What do you think of my idea?

First of all, NUMA nodes don't have any balancing done on them, so I
don't think they're an appropriate structure.  But, NUMA nodes *do*
contain zones, which are a slightly more appropriate structure.

One thing I pointed out when he first posted this code was that a lot of
the accounting gets shifted from the 'struct zone' to the ckrm class.
It was appropriate to have a set of macros to set up and perform this
indirection.

However, a 'struct zone' currently has more than one job.  It collects
"like" pages together, it provides accounting for those pages, and it
represents a contiguous area of memory.

If you could collect just the accounting pieces out of 'struct zone',
perhaps those could be used by both ckrm classes, and the old 'struct
zone'.

-- Dave

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