linux-kernel - Re: [PATCH 0/2] ZERO PAGE again v4.

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Message-ID: <Pine.LNX.4.64.0907261639570.32238@sister.anvils>
Date:	Sun, 26 Jul 2009 17:00:54 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, npiggin@...e.de, avi@...hat.com,
	torvalds@...ux-foundation.org, aarcange@...hat.com
Subject: Re: [PATCH 0/2] ZERO PAGE again v4.

On Thu, 23 Jul 2009, KAMEZAWA Hiroyuki wrote:
> On Wed, 22 Jul 2009 17:12:45 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> > On Thu, 23 Jul 2009 08:51:37 +0900
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > > On Thu, 16 Jul 2009 18:01:34 +0900
> > > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > > > 
> > > > Rebased onto  mm-of-the-moment snapshot 2009-07-15-20-57.
> > > > And modifeied to make vm_normal_page() eat FOLL_NOZERO, directly.
> > > > 
> > > > Any comments ?

Sorry, I've been waiting to have something positive to suggest,
but today still busy with my own issues (handling OOM in KSM).

I do dislike that additional argument to vm_normal_page, and
feel that's a problem to be solved in follow_page, rather
than spread to every other vm_normal_page user.

Does follow_page even need to be using vm_normal_page?
Hmm, VM_MIXEDMAP, __get_user_pages doesn't exclude that.

I also feel a strong (but not yet fulfilled) urge to check
all the use_zero_page ignore_zero stuff: which is far from
self-evident.

Hugh
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