From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227])
	by kanga.kvack.org (Postfix) with SMTP id 6BF8F6B01B8
	for <linux-mm@kvack.org>; Mon, 22 Mar 2010 13:12:08 -0400 (EDT)
Date: Mon, 22 Mar 2010 18:08:38 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 00 of 34] Transparent Hugepage support #14
Message-ID: <20100322170838.GR29874@random.random>
References: <patchbomb.1268839142@v2.random>
 <alpine.DEB.2.00.1003171353240.27268@router.home>
 <20100318234923.GV29874@random.random>
 <alpine.DEB.2.00.1003190812560.10759@router.home>
 <20100319144101.GB29874@random.random>
 <alpine.DEB.2.00.1003221027590.16606@router.home>
 <20100322163523.GA12407@cmpxchg.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20100322163523.GA12407@cmpxchg.org>
Sender: owner-linux-mm@kvack.org
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux-foundation.org>, linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>
List-ID: <linux-mm.kvack.org>

On Mon, Mar 22, 2010 at 05:35:23PM +0100, Johannes Weiner wrote:
> That only works if you merely read the tables.  If the VMA gets broken
> up in the middle of a huge page, you definitely have to map ptes again.
> 
> And as already said, allowing it to happen always-succeeding and
> atomically allows to switch users step by step.
> 
> That sure sounds more incremental to me than being required to do
> non-trivial adjustments to all the places at once!

Exactly! ;)

Thanks for your further clarification.
Andrea

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>