Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760471AbXESLfR (ORCPT ); Sat, 19 May 2007 07:35:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755761AbXESLfG (ORCPT ); Sat, 19 May 2007 07:35:06 -0400 Received: from one.firstfloor.org ([213.235.205.2]:47710 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755354AbXESLfF (ORCPT ); Sat, 19 May 2007 07:35:05 -0400 Date: Sat, 19 May 2007 13:35:01 +0200 From: Andi Kleen To: Andrew Morton Cc: Fengguang Wu , linux-kernel@vger.kernel.org, Andi Kleen , Jens Axboe , Oleg Nesterov , Steven Pratt , Ram Pai Subject: Re: [PATCH 1/9] readahead: introduce PG_readahead Message-ID: <20070519113501.GB25563@one.firstfloor.org> References: <20070516224752.500812933@mail.ustc.edu.cn> <379355695.83536@ustc.edu.cn> <20070518232824.9917d794.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070518232824.9917d794.akpm@linux-foundation.org> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 540 Lines: 14 > We have the advantage that if the kernel very occasionally gets the wrong > result for PageReadahead(page), nothing particularly bad will happen, so we > can do racy things. On 64bit there is no particular shortage of page flags. If you ever do racy things please do them 32bit only. -Andi - 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/