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Date: Thu, 16 Apr 2009 17:03:22 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Mathieu Desnoyers <compudj@...stal.dyndns.org> CC: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Frederic Weisbecker <fweisbec@...il.com>, Theodore Tso <tytso@....edu>, Arjan van de Ven <arjan@...radead.org>, Christoph Hellwig <hch@....de>, Lai Jiangshan <laijs@...fujitsu.com>, Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Masami Hiramatsu <mhiramat@...hat.com>, "Frank Ch. Eigler" <fche@...stic.org>, Tom Zanussi <tzanussi@...il.com>, Jiaying Zhang <jiayingz@...gle.com>, Michael Rubin <mrubin@...gle.com>, Martin Bligh <mbligh@...gle.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Neil Horman <nhorman@...driver.com>, Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>, Pekka Enberg <penberg@...helsinki.fi> Subject: Re: [PATCH 2/8] tracing: create automated trace defines Mathieu Desnoyers wrote: > The other point I dislike about the out-of-line approach is that the > tracer will suffer from a pointless supplementary function call at each > event. Given how slow function calls are, at least on x86, I'd prefer > leaving the handler call chain inline, unless there is a very strong > reason not to do so. > Are they? They're generally considered to be "free", because the call and return are predicted 100% accurately. > I'll come up with a patch that leaves the tracepoint inline, but fixes > the header dependency. > OK. J -- 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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