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 EB0B36B004D for ; Thu, 9 Jul 2009 23:30:08 -0400 (EDT) Date: Fri, 10 Jul 2009 05:51:38 +0200 From: Nick Piggin Subject: Re: [RFC][PATCH 0/4] ZERO PAGE again v2 Message-ID: <20090710035138.GA14666@wotan.suse.de> References: <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> <20090710020920.GB15903@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 08:38:41PM -0700, Linus Torvalds wrote: > > > On Fri, 10 Jul 2009, Nick Piggin wrote: > > > > 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. > > Oh, I argued against it. And I told people we can always revert it. > > But even better than reverting it is to just fix it cleanly in the new > world order, wouldn't you say? If it is put back in without being refcounted, that should be fine. That's what I first proposed for it (although you didn't think my actua implementation was clean and preferred to remove it completely). I would like to see support for architectures which don't define a pte_special bit too, however. > > So to answer your question, I guess I would like to know a bit > > more about the regression and what the app is doing. > > Ok, go ahead and try to figure it out. But please don't cc me on it any > more. I'm not interested in your hang-ups with ZERO_PAGE. > > Because I just don't care. I think ZERO_PAGE was great to begin with, I > put it to use muyself historically at Transmeta, and I didn't like your > crusade against it. > > People (including me) have told you why it's useful. Whatever. If you > still want more information, go bother somebody else. You're apparently not reading what I write when I do cc you, so I don't think there would be much difference. -- 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