From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51])
	by kanga.kvack.org (Postfix) with SMTP id 054CC6B01AC
	for <linux-mm@kvack.org>; Thu, 25 Mar 2010 18:18:28 -0400 (EDT)
Date: Thu, 25 Mar 2010 17:17:23 -0500 (CDT)
From: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [PATCH 00 of 34] Transparent Hugepage support #14
In-Reply-To: <20100324212249.GI10659@random.random>
Message-ID: <alpine.DEB.2.00.1003251708170.10999@router.home>
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>
 <20100322170619.GQ29874@random.random> <alpine.DEB.2.00.1003231200430.10178@router.home> <20100323190805.GH10659@random.random> <alpine.DEB.2.00.1003241600001.16492@router.home> <20100324212249.GI10659@random.random>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-linux-mm@kvack.org
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: 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 Wed, 24 Mar 2010, Andrea Arcangeli wrote:

> On Wed, Mar 24, 2010 at 04:03:03PM -0500, Christoph Lameter wrote:
> > If a delay is "altered behavior" then we should no longer run reclaim
> > because it "alters" the behavior of VM functions.
>
> You're comparing the speed of ram with speed of disk. If why it's not
> acceptable to me isn't clear try booting with mem=100m and I'm sure
> you'll get it.

Are you talking about the wait for writeback to be complete? Dirty pages
can be migrated. With some effort you could avoid the writeback complete
wait since you are not actually moving the page.



--
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>