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

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Date:	Wed, 11 Oct 2006 02:43:33 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linux Memory Management <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: SPAM: Re: [patch 3/3] mm: fault handler to replace nopage and populate

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@...e.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?
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