Re: [RFC][PATCH] vmemmap on sparsemem v2

[Heiko Carstens <heiko.carstens@de.ibm.com>]

> I have to say that I have generally been a virtual memap sceptic.  It
> seems complex and any testing I have done or seen doesn't seem to show
> any noticible performance benefit.
> 
> That said I do like the general thrust of this patch set.  There is
> basically no architecture specific component for this implementation
> other than specifying the base address.  This seems worth of testing
> (and I see akpm has already slurped this up) good.
> 
> Would we expect to see this replace the existing ia64 implementation in
> the long term?  I'd hate to see us having competing implementations
> here.  Also Heiko would this framework with your s390 requirements for
> vmem_map, I know that you have a particularly challenging physical
> layout?  It would be great to see just one of these in the kernel.

Hmm.. this implementation still requires sparsemem. Maybe it would be
possible to implement a generic vmem_map infrastructure that works with
and without sparsemem?
I would be more than happy to get rid of the s390 specific vmem_map
implementation (it is merged in the meantime).

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