From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id 3215F6B004D for ; Thu, 9 Jul 2009 21:48:24 -0400 (EDT) Date: Fri, 10 Jul 2009 04:09:20 +0200 From: Nick Piggin Subject: Re: [RFC][PATCH 0/4] ZERO PAGE again v2 Message-ID: <20090710020920.GB15903@wotan.suse.de> References: <20090707165101.8c14b5ac.kamezawa.hiroyu@jp.fujitsu.com> <20090707084750.GX2714@wotan.suse.de> <20090707180629.cd3ac4b6.kamezawa.hiroyu@jp.fujitsu.com> <20090707140033.GB2714@wotan.suse.de> <20090708062125.GJ2714@wotan.suse.de> <20090709074745.GT2714@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org To: Linus Torvalds Cc: KAMEZAWA Hiroyuki , "linux-mm@kvack.org" , "hugh.dickins@tiscali.co.uk" , avi@redhat.com, "akpm@linux-foundation.org" List-ID: On Thu, Jul 09, 2009 at 10:54:02AM -0700, Linus Torvalds wrote: > > > On Thu, 9 Jul 2009, Nick Piggin wrote: > > > > Having a ZERO_PAGE I'm not against, so I don't know why you claim > > I am. Al I'm saying is that now we don't have one, we should have > > some good reasons to introduce it again. Unreasonable? > > Umm. I had good reasons to introduce it in the _first_ place. > > And now you have reports of people who depend on the behaviour, and point > to the new behaviour as a *regression*. > > What the _hell_ more do you want? Well there is obviously no way to test a representaive sample of workoads, and we pretty much knew that some people are going to prefer to have a ZERO_PAGE with their app. So if you were going to re-add the zero page when a single regression is reported after a year or two, then it was wrong of you to remove the zero page to begin with. So to answer your question, I guess I would like to know a bit more about the regression and what the app is doing. -- 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: email@kvack.org