Re: [PATCH 7/8] mm: reinstate ZERO_PAGE

Hugh Dickins
2009-09-08T16:42:08Z

On Tue, 8 Sep 2009, Nick Piggin wrote:
> On Tue, Sep 08, 2009 at 01:17:01PM +0100, Hugh Dickins wrote:
> > By the way, in compiling that list of "special" architectures,
> > I was surprised not to find ia64 amongst them. Not that it
> > matters to me, but I thought the Fujitsu guys were usually
> > keen on Itanium - do they realize that the special test is
> > excluding it, or do they have their own special patch for it?
>
> I don't understand your question. Are you asking whether they
> know your patch will not enable zero pages on ia64?

That's what I was meaning to ask, yes; but wondering whether
perhaps they've already got their own patch to enable pte_special
on ia64, and just haven't got around to sending it in yet.

>
> I guess pte special was primarily driven by gup_fast, which in
> turn was driven primarily by DB2 9.5, which I think might be
> only available on x86 and ibm's architectures.
>
> But I admit to being a curious as to when I'll see a gup_fast
> patch come out of SGI or HP or Fujitsu :)

Yes, me too!

Hugh