RE: hugetlb demand paging patch part [2/3]

Chen, Kenneth W
2004-04-16T05:56:14Z

David Gibson wrote on Thursday, April 15, 2004 9:49 PM
> > > If we could get rid of follow_hugetlb_pages() it would remove an ugly
> > > function from every arch, which would be nice.
> >
> > I hope the goal here is not to trim code for existing prefaulting scheme.
> > That function has to go for demand paging, and demand paging comes with
> > a performance price most people don't realize. If the goal here is to
> > make the code prettier, I vote against that.
>
> Well, I'm attempting to understand the hugepage code across all the
> archs, so that I can try to implement copy-on-write with a minimum of
> arch specific gunk. Simplifying and consolidating the existing code
> across archs would be a helpful first step, if possible.

Looks like everyone has their own agenda, COW is related to demand paging,
and has it's own set of characteristics to deal with. I would hope do one
thing at a time.

- Ken