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Date: Wed, 23 Jan 2008 16:58:34 -0500 (EST) From: Steven Rostedt <rostedt@...dmis.org> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Christoph Hellwig <hch@...radead.org>, Gregory Haskins <ghaskins@...ell.com>, Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Thomas Gleixner <tglx@...utronix.de>, Tim Bird <tim.bird@...sony.com>, Sam Ravnborg <sam@...nborg.org>, "Frank Ch. Eigler" <fche@...hat.com>, Jan Kiszka <jan.kiszka@...mens.com>, John Stultz <johnstul@...ibm.com>, Arjan van de Ven <arjan@...radead.org>, Steven Rostedt <srostedt@...hat.com> Subject: Re: [PATCH 06/20 -v5] add notrace annotations for NMI routines On Wed, 23 Jan 2008, Mathieu Desnoyers wrote: > * Steven Rostedt (rostedt@...dmis.org) wrote: > > This annotates NMI functions with notrace. Some tracers may be able > > to live with this, but some cannot. So we turn off NMI tracing. > > > > One solution might be to make a notrace_nmi which would only turn > > off NMI tracing if a trace utility needed it off. > > > Is this still needed with the atomic clocksource read ? This never had to do with the clocksource. The tracer itself isn't atomic against NMIs. hmm, it may actually be. It does a tracer disable for the CPU by an atomic_inc and this would prevent the NMI from causing harm. I'll test without this patch and see what happens when I turn on a high rate of NMIS. I still want to add a bit more notraces around for the simple reason of cleaning up the output and prehaps speeding up the code a bit. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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