From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 12 Jul 2002 15:38:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 12 Jul 2002 15:38:49 -0400 Received: from holomorphy.com ([66.224.33.161]:41374 "EHLO holomorphy") by vger.kernel.org with ESMTP id ; Fri, 12 Jul 2002 15:38:49 -0400 Date: Fri, 12 Jul 2002 12:40:28 -0700 From: William Lee Irwin III To: Hanna Linder Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [Lse-tech] Minutes from LSE Con Call Message-ID: <20020712194028.GR25360@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Hanna Linder , lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org References: <29610000.1026499086@w-hlinder> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Description: brief message Content-Disposition: inline In-Reply-To: <29610000.1026499086@w-hlinder> User-Agent: Mutt/1.3.25i Organization: The Domain of Holomorphy Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 12, 2002 at 11:38:06AM -0700, Hanna Linder wrote: > 8. Daniel asked about seeing results of rmap on a numaq. > Martin got distracted but will get back to getting some > results. On elm3b17 I found more 2.5.25 vs. NUMA-Q issues and got workarounds for booting while doing work on stuffing pte_chains into highmem: (1) cpu_init() heisenbug that goes away when adding printk's I just added the extra printk's and moved on (2) in_interrupt() is racy and needs to disable preemption while checking per-cpu counters. The trivial fix. (3) CONFIG_PREEMPT calls preempt_schedule() on secondaries before they're ready, and the exception is flagged as no vm86_info: BAD Didn't want to go to deep into it at 3AM and disabled preempt. The usual ioremap()/smp_call_function() deadlock, irqbalance plugging unreachable cpu's into ioapics, bio splitting to make qlogicisp happy, and MAX_IO_APICS things are still needed. So I guess the "real fixes" need to get found at some point and propagated out to maintainers. hpa and mochel are on cpu_init(), and rml should be on preempt vs. printk and in_interrupt(). axboe has already got bio splitting ready and no idea about the MAX_IO_APICS and getting irqbalance fixes past mingo doesn't look easy. Cheers, Bill