From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from relay2.sgi.com ([192.48.179.30] helo=relay.sgi.com) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1MIyyq-0000HQ-92 for kexec@lists.infradead.org; Tue, 23 Jun 2009 05:55:46 +0000 Date: Tue, 23 Jun 2009 00:55:36 -0500 From: Robin Holt Subject: Re: [PATCH 1/7] ia64, kdump: Mask MCA/INIT on freezing cpus Message-ID: <20090623055536.GE6865@sgi.com> References: <4A39E247.4030908@jp.fujitsu.com> <4A39E2CF.80901@jp.fujitsu.com> <20090622134557.GC7084@sgi.com> <4A4022EA.1020506@jp.fujitsu.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <4A4022EA.1020506@jp.fujitsu.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Hidetoshi Seto Cc: linux-ia64@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Haren Myneni , Robin Holt , Vivek Goyal On Tue, Jun 23, 2009 at 09:33:46AM +0900, Hidetoshi Seto wrote: > Robin Holt wrote: ... > Do you mean that the 2nd kernel should be able to handle MCA/INIT from its > boot up? I guess the word PROM is nearly equal to PAL/SAL firmware, if so > then I don't think there are good generic interface/procedure could be > useful here. Do you have any concrete idea? No concrete ideas. Just a really uneasy feeling whenever the INIT is disabled. On SGI's ia64 servers, when the INIT is first received, our PROM (PAL/SAL) records the processors state. This record remains for the next reset or for salinfo to transfer to disk. We can dump all the records in a format somewhat similar to the output in /var/log/salinfo/decoded. On more occasions than I could even begin to describe, those records have helped us determine what the processor was doing despite it even ignoring interrupts. This includes everything except when MCA/INIT handling is disabled or PMIs are being processed. If you could give this some consideration, I would appreciate it. I really don't have the time to dedicate to thinking all the way through and therefore will not stand in the way of any patch you propose. If I can be of help in any way, please let me know. Thanks, Robin _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec