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SubjectRe: RFC: COW for hugepages
On Wed, Apr 07, 2004 at 08:24:43PM -0700, Andrew Morton wrote:
> David Gibson <david@gibson.dropbear.id.au> wrote:
> >
> > > I don't see much in the COW code which is ppc64-specific. All the hardware
> > > needs to do is to provide a way to make the big pages readonly. With a bit
> > > of an abstraction for the TLB manipulation in there it should be pretty
> > > straightforward.
> > >
> > > Certainly worth the attempt, no?
> >
> > Yes, you have a point. However doing it in a cross-arch way will
> > require building more of a shared abstraction about hugepage pte
> > entries that exists currently. And that will mean making significant
> > changes to all the archs to create that abstraction. I don't know
> > enough about the other archs to be confident of debugging such
> > changes, but I'll see what I can do.
>
> Well the first step is to consolidate the existing duplication in 2.6.5
> before thinking about new features. That's largely a cut-n-paste job which
> I've been meaning to get onto but alas have not. I don't want to dump it
> on you just because you want to tend to your COWs so if you have other
> things to do, please let me know.

Well, I do have other things to do, so I'll try to look at the
consolidation when I get a chance.

> We could use the `weak' attribute in mm/hugetlbpage.c for those cases where
> one arch really needs to do something different.

Yes, that's an idea.

--
David Gibson | For every complex problem there is a
david AT gibson.dropbear.id.au | solution which is simple, neat and
| wrong.
http://www.ozlabs.org/people/dgibson
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