From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Witbrodt Subject: Re: [PATCH diagnostic] Re: HPET regression in 2.6.26 versus 2.6.25 -- RCU problem Date: Mon, 11 Aug 2008 09:22:01 -0700 (PDT) Message-ID: <777191.9258.qm@web82105.mail.mud.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, Yinghai Lu , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , netdev To: paulmck@linux.vnet.ibm.com Return-path: Received: from web82105.mail.mud.yahoo.com ([209.191.84.218]:44070 "HELO web82105.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751430AbYHKQWD (ORCPT ); Mon, 11 Aug 2008 12:22:03 -0400 Sender: netdev-owner@vger.kernel.org List-ID: > And attached is the kernel module I used to test the patch, for whatever > that might be worth. Thank you for that, too. I have some questions and a comment: 1. This module can only be loaded from a working system, right? You mean that _you_ tested the kernel code on _your_ system to see if it was working correctly, and did not mean that I should use this with the problematic kernels on my system? I could easily run this with something like 'modprobe stall' on my working machine, or on the problem machine if I boot with the "hpet=disabled" parameter, but doing so would not help us find the problem, right? 2. Coincidentally, I had started reading Understanding the Linux Kernel (first edition, 2000) about a week before I got socked with the kernel freeze issue. I was reading it at work -- I work as a tutor, and there are sometimes slow times without students to help -- but haven't had a chance to do so in the best 10 days while I've been struggling with my own kernel problem. It is also quite out-of-date -- published in 2000, and discussing the 2.2 kernel line. I know that there have been a couple of new editions since then, but I just happened to have this first edition on my shelf... so I took it into work for a little light reading. Anyway, I have a lot on my personal TODO list for the fall, but maybe early next year I will have a chance to play with the kernel for fun. When I do so, I will have your new, experimental module to look at... among tons of other things. Thanks, Dave W.