From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992908AbXCICws (ORCPT ); Thu, 8 Mar 2007 21:52:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992909AbXCICws (ORCPT ); Thu, 8 Mar 2007 21:52:48 -0500 Received: from ozlabs.org ([203.10.76.45]:44642 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992908AbXCICwr (ORCPT ); Thu, 8 Mar 2007 21:52:47 -0500 Date: Thu, 8 Mar 2007 20:52:32 -0600 From: Anton Blanchard To: Kyle Moffett Cc: Eric Dumazet , "Michael K. Edwards" , Linus Torvalds , Davide Libenzi , Avi Kivity , Linux Kernel Mailing List , Andrew Morton , Al Viro Subject: Re: [patch] epoll use a single inode ... Message-ID: <20070309025232.GD24695@kryten> References: <45ED1A3C.6030707@argo.co.il> <200703071906.58405.dada1@cosmosbay.com> <200703071952.13219.dada1@cosmosbay.com> <20070307221401.GA16938@kryten> <6E1C86DF-D512-418C-B270-BC5C4316BC0A@mac.com> <45EFBA14.9090307@cosmosbay.com> <8638AE87-6005-4021-98EB-43E55694B0FB@mac.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8638AE87-6005-4021-98EB-43E55694B0FB@mac.com> User-Agent: Mutt/1.5.12-2006-07-14 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, > Well, PowerPC "dcbt" does prefetch() correctly, it doesn't ever raise > exceptions, doesn't have any side effects, takes only enough CPU to > decode the address, and is ignored if it would have to do anything > other than load the cacheline from RAM. Prefetch streams are halted > when they reach the end of a page boundary (no trapping to the MMU) > and if the TLB entry isn't present then they would asynchronously > abort. It depends on the implementation and the HID bit settings. Some do walk the MMU hashtable if it isnt in the TLB. Anton