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Message-ID: <04EAB7311EE43145B2D3536183D1A8445499DB92@GSjpTKYDCembx31.service.hitachi.net>
Date: Thu, 1 Oct 2015 10:24:19 +0000
From: 河合英宏 / KAWAI,HIDEHIRO
<hidehiro.kawai.ez@...achi.com>
To: "'Borislav Petkov'" <bp@...en8.de>
CC: "'Peter Zijlstra'" <peterz@...radead.org>,
Jonathan Corbet <corbet@....net>,
Ingo Molnar <mingo@...nel.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Vivek Goyal <vgoyal@...hat.com>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"x86@...nel.org" <x86@...nel.org>,
"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Michal Hocko <mhocko@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
平松雅巳 / HIRAMATU,MASAMI
<masami.hiramatsu.pt@...achi.com>
Subject: RE: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option
> On Thu, Oct 01, 2015 at 07:01:50AM +0000, 河合英宏 / KAWAI,HIDEHIRO wrote:
> > I suppose that a sever which uses this feature will equip a BMC
> > and BMC mandatorily supports hard reset command for the server.
> > If the HA clustering software detects no response from the server
> > after relatively long timeout, it might want to insert hard reset
> > to the server by IPMI over LAN.
>
> So why doesn't the capture kernel *automatically* ignore external NMIs,
> without a cmdline option?
>
> Before it starts capturing, it says: "I'm starting capturing and am
> ignoring external NMIs from now on."
But how do we check if the starting kernel is a dump capture kernel?
I think using cmdline option is the simplest way. You just have to
add "noextnmi" to KDUMP_COMMANDLINE_APPEND in /etc/sysconfig/kdump.
Regards,
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group
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