From: Peter Zijlstra <peterz@infradead.org>
To: Mike Travis <travis@sgi.com>
Cc: Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Jason Wessel <jason.wessel@windriver.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Dimitri Sivanich <sivanich@sgi.com>, Hedi Berriche <hedi@sgi.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler
Date: Mon, 9 Sep 2013 14:43:49 +0200 [thread overview]
Message-ID: <20130909124349.GY31370@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20130905225034.343366161@asylum.americas.sgi.com>
On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote:
> For performance reasons, the NMI handler may be disabled to lessen the
> performance impact caused by the multiple perf tools running concurently.
> If the system nmi command is issued when the UV NMI handler is disabled,
> the "Dazed and Confused" messages occur for all cpus. The NMI handler is
> disabled by setting the nmi disabled variable to '1'. Setting it back to
> '0' will re-enable the NMI handler.
I'm not entirely sure why this is still needed now that you've moved all
really expensive bits into the UNKNOWN handler.
next prev parent reply other threads:[~2013-09-09 12:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-05 22:50 [PATCH 0/9] x86/UV/KDB/NMI: Updates for NMI/KDB handler for SGI UV Mike Travis
2013-09-05 22:50 ` [PATCH 1/9] x86/UV: Move NMI support Mike Travis
2013-09-05 22:50 ` [PATCH 2/9] x86/UV: Update UV support for external NMI signals Mike Travis
2013-09-05 22:50 ` [PATCH 3/9] x86/UV: Add summary of cpu activity to UV NMI handler Mike Travis
2013-09-05 22:50 ` [PATCH 4/9] x86/UV: Add kdump " Mike Travis
2013-09-05 22:50 ` [PATCH 5/9] KGDB/KDB: add support for external NMI handler to call KGDB/KDB Mike Travis
2013-09-06 4:36 ` Jason Wessel
2013-09-05 22:50 ` [PATCH 6/9] x86/UV: Add call to KGDB/KDB from NMI handler Mike Travis
2013-09-05 22:50 ` [PATCH 7/9] KGDB/KDB: add new system NMI entry code to KDB Mike Travis
2013-09-06 5:00 ` Jason Wessel
2013-09-06 16:48 ` Mike Travis
2013-09-05 22:50 ` [PATCH 8/9] x86/UV: Add uvtrace support Mike Travis
2013-09-05 22:50 ` [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler Mike Travis
2013-09-09 12:43 ` Peter Zijlstra [this message]
2013-09-09 17:07 ` Mike Travis
2013-09-10 9:03 ` Peter Zijlstra
2013-09-12 17:27 ` Paul E. McKenney
2013-09-12 18:35 ` Paul E. McKenney
2013-09-12 19:08 ` Mike Travis
2013-09-12 18:59 ` Mike Travis
2013-09-12 19:48 ` Hedi Berriche
2013-09-12 20:17 ` Paul E. McKenney
2013-09-12 20:16 ` Paul E. McKenney
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