linux-kernel - Re: [PATCH v6 1/3] trace: Make removal of ring buffer pages atomic

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Date:	Thu, 03 May 2012 10:12:55 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Laurent Chavey <chavey@...gle.com>,
	Justin Teravest <teravest@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/3] trace: Make removal of ring buffer pages atomic

On Thu, 2012-05-03 at 08:57 -0400, Steven Rostedt wrote:

> So it seems to be trace-cmd doing something different that prevents the
> expand from happening. Not sure what it is. If I get time, I'll
> investigate it a little more.

Do the following:

echo 0 > /debug/tracing/tracing_on
echo nop  > /debug/tracing/current_tracer

then look at buffer_size_kb.

It's also giving me errors when I try to enable events or anything else
when tracing_on is disabled.

-- Steve


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