Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932163AbVKJVnV (ORCPT ); Thu, 10 Nov 2005 16:43:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932172AbVKJVnV (ORCPT ); Thu, 10 Nov 2005 16:43:21 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:63926 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S932163AbVKJVnS (ORCPT ); Thu, 10 Nov 2005 16:43:18 -0500 Date: Thu, 10 Nov 2005 13:43:12 -0800 (PST) From: Christoph Lameter To: Andrew Morton cc: Hugh Dickins , nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org Subject: Re: [PATCH 10/15] mm: atomic64 page counts In-Reply-To: <20051109190135.45e59298.akpm@osdl.org> Message-ID: References: <20051109181641.4b627eee.akpm@osdl.org> <20051109190135.45e59298.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 687 Lines: 16 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. - 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/