Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932181AbVKJVyA (ORCPT ); Thu, 10 Nov 2005 16:54:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932182AbVKJVyA (ORCPT ); Thu, 10 Nov 2005 16:54:00 -0500 Received: from smtp.osdl.org ([65.172.181.4]:20622 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S932181AbVKJVx7 (ORCPT ); Thu, 10 Nov 2005 16:53:59 -0500 Date: Thu, 10 Nov 2005 13:53:36 -0800 From: Andrew Morton To: Christoph Lameter Cc: hugh@veritas.com, nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org Subject: Re: [PATCH 10/15] mm: atomic64 page counts Message-Id: <20051110135336.24d04b86.akpm@osdl.org> In-Reply-To: References: <20051109181641.4b627eee.akpm@osdl.org> <20051109190135.45e59298.akpm@osdl.org> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 845 Lines: 20 Christoph Lameter wrote: > > On Wed, 9 Nov 2005, Andrew Morton wrote: > > > > I'm quite pleased with the way it's worked out, but you were intending > > > that the 64-bit arches should get along with 32-bit counts? Maybe. > > > > That seems reasonsable for file pages. For the ZERO_PAGE the count can do > > whatever it wants, because we'd never free them up. > > Frequent increments and decrements on the zero page count can cause a > bouncing cacheline that may limit performance. I think Hugh did some instrumentation on that and decided that problems were unlikely? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/