linux-kernel - Re: [PATCH 1/5] trace: do not disable wake up tracer on output of trace

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Message-ID: <20090122092942.GA30467@elte.hu>
Date:	Thu, 22 Jan 2009 10:29:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/5] trace: do not disable wake up tracer on output of
	trace


* Ingo Molnar <mingo@...e.hu> wrote:

> auto-disabling latency tracing while the trace is being output is 
> essential. Measurement should never impact the workload that is being 
> measured.

On the other hand - the latencies caused by tracing output itself should be 
quite low, correct? If not then that needs fixing too. So i've picked up 
your change - lets see how useful the result is.

But "if it hurts, disable tracing before reading the tracing result" method 
you expressed is really not acceptable.

	Ingo
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