From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 30 Mar 2007 04:40:48 +0200 From: Nick Piggin Subject: Re: [rfc][patch 1/2] mm: dont account ZERO_PAGE Message-ID: <20070330024048.GG19407@wotan.suse.de> References: <20070329075805.GA6852@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 Return-Path: To: Hugh Dickins Cc: Andrew Morton , Linus Torvalds , Linux Memory Management List , tee@sgi.com, holt@sgi.com List-ID: On Thu, Mar 29, 2007 at 02:10:55PM +0100, Hugh Dickins wrote: > > But this patch is not complete, is it? For example, fremap.c's > zap_pte? I haven't checked further. I was going to suggest you Ah yes, nonlinear... thanks I missed that. Well it would make life easier if we got rid of ZERO_PAGE completely, which I definitely wouldn't complain about ;) It is much more likely to cause noticable performance loss in other areas though, so it is not really a candidate for SLES at the moment. But I would like to get something for mainline that everyone likes whether that is vm_refcounted_page (which I just implemented and it doesn't make things much cleaner, but I'll go with it); per-node ZERO_PAGE; or whatever. -- 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