Re: SPAM: Re: [patch 3/3] mm: fault handler to replace nopage and populate

Nick Piggin
2006-10-11T00:43:48Z

On Tue, Oct 10, 2006 at 10:52:36AM -0700, Andrew Morton wrote:
> On Tue, 10 Oct 2006 14:13:27 +0200
> Nick Piggin <npiggin@suse.de> wrote:
> >
> > Hmm... I agree it is more consistent, but OTOH if we're passing a
> > structure I thought it may as well just go in there. But I will
> > change unless anyone comes up with an objection.
>
> I'd agree that it's more attractive to have the vma* in the argument list,
> but it presumably adds runtime cost: cycles and stack depth. I don't how
> much though.

Possibly, though I considered it might end up in a register, and
considering that the vma is used both before and after the call, and
in filemap_nopage, it's quite possible that it saves a load and does
not harm stack depth. Maybe?

I don't know, I guess we can tweak it while it is in -mm?