Re: [RFC][PATCH] Dynamically allocated pageflags.

[Nigel Cunningham]

Hi.

On Sat, 2005-02-19 at 16:51, Dave Hansen wrote:
> On Sat, 2005-02-19 at 14:35 +1100, Nigel Cunningham wrote:
> > On Sat, 2005-02-19 at 14:02, Dave Hansen wrote:
> > > One issue is that it doesn't work with DISCONTIGMEM (or the upcoming
> > > sparsemem).  max_mapnr doesn't exist on those systems, and on the really
> > > discontiguous ones, you might be allocating very large areas with very
> > > sparse maps.
> > 
> > :> Am I right in thinking that just requires something similar, done
> > per-zone? If that's the case, I'll happily modify the code to suit. I
> > should support discontig anyway in suspend.
> 
> The mem_maps are per-pgdat or per-node with discontig, but I have a
> patch in the pipeline to take them out of there and make one for every
> 128MB or 256MB, etc... area of memory (for memory hotplug).  So, hanging
> them off the pgdat or zone won't even work in that case, because even
> the struct zone can have pretty sparse memory inside of it.  I *think*
> the table is the only way to go.  But, that can wait until Monday. :)

Okay. I'll just wait :>

Nigel
-- 
Nigel Cunningham
Software Engineer, Canberra, Australia
http://www.cyclades.com

Ph: +61 (2) 6292 8028      Mob: +61 (417) 100 574

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