On Thu, 2005-05-19 at 04:11, Andrew Morton wrote:
> Andy Whitcroft <apw@shadowen.org> wrote:
> >
> >  > How many bits are spare now?  ZONETABLE_PGSHIFT hurts my brain.
> > 
> >  The short answer is that on 32 bit architectures there are 24 bits
> >  allocated to general page flags, page-flags.h indicates that 21 are
> >  currently assigned so assuming it is accurate there are currently 3 bits
> >  free.
> 
> Yipes, I didn't realise we were that close.
> 
> We can reclaim PG_highmem, use page_zone(page)->highmem

Your wish is my command :)

I am worried about the overhead this might add to kmap/kunmap().

Thanks,
Badari