Linus Torvalds wrote:

On Sat, 20 Jul 2002, Rik van Riel wrote:

quoted

OK, I'll try to forward-port Ed's code to do that from 2.4 to 2.5
this weekend...

Side note: while I absolutely think that is the right thing to do, that's
also the much more "interesting" change. As a result, I'd be happier if it
went through channels (ie probably Andrew) and had some wider testing
first at least in the form of a CFT on linux-kernel.

I'd suggest that we avoid putting any additional changes into
the VM until we have solutions available for:

2: Make it work with pte-highmem  (Bill Irwin is signed up for this)

4: Move the pte_chains into highmem too (Bill, I guess)

6: maybe GC the pte_chain backing pages. (Seems unavoidable.  Rik?)


Especially pte_chains in highmem.  Failure to fix this well
is a showstopper for rmap on large ia32 machines, which makes
it a showstopper full stop.

If we can get something in place which works acceptably on Martin
Bligh's machines, and we can see that the gains of rmap (whatever
they are ;)) are worth the as-yet uncoded pains then let's move on.
But until then, adding new stuff to the VM just makes a `patch -R'
harder to do.

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