Messages in this thread | | | Date | Thu, 8 Apr 2004 13:56:45 +1000 | From | David Gibson <> | Subject | Re: RFC: COW for hugepages |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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