linux-kernel - Re: [PATCH 0/3] tracepoints: delay argument evaluation

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Date:	Tue, 19 May 2009 20:42:52 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>, jiayingz@...gle.com,
	mbligh@...gle.com, roland@...hat.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 0/3] tracepoints: delay argument evaluation


On Tue, 19 May 2009, Mathieu Desnoyers wrote:
> 
> Given the tradeoff is taste vs overhead, what do you think of the
> following proposal ?
> 
> trace(block_bio_complete, md->queue, bio);

I'm fine with this. It is extremely important that the trace point 
overhead is negligible when disabled. Otherwise, they serve no purpose.

-- Steve
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