Re: [RFC] Simplify node/zone portion of page->flags

[Jesse Barnes]

On Sun, Nov 23, 2003 at 02:49:03PM -0800, Jesse Barnes wrote:
> On Sun, Nov 23, 2003 at 02:40:52PM -0800, Andrew Morton wrote:
> > >  zone_num.  This makes it trivial to recover either the node or zone 
> > >  number with a simple bitshift.  There are many places in the kernel 
> > >  where we do things like: page_zone(page)->zone_pgdat->node_id to 
> > >  determine the node a page belongs to.  With this patch we save several 
> > >  pointer dereferences, and it boils down to shifting some bits.
> > 
> > This rather conflicts with the patch from Jesse which I have.  Can you guys
> > work that out and let me know when you're done?
> 
> I like Matt's patch, but haven't tested it yet.  I'll try it out on
> Monday.

Matt, this looks ok (at least it boots on my test system).  I wasn't
able test it on a very large system though, but it looks functionally
identical to the patch in Andrew's tree.  Btw, you probably want to put
() around NODEZONE_SHIFT + ZONES_SHIFT in page_nodenum() otherwise gcc
will complain loudly.

Jesse
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