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Date: Thu, 25 Sep 2008 17:56:32 +0200
From: "=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@gmail.com>
To: "Pekka Paalanen" <pq@iki.fi>
Subject: Re: [Patch -tip 1/3] Tracing/ftrace: Relay unhandled entry output
Cc: "Steven Rostedt" <rostedt@goodmis.org>, "Ingo Molnar" <mingo@elte.hu>,
       linux-kernel@vger.kernel.org
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2008/9/25 Pekka Paalanen <pq@iki.fi>:
> My understanding is that the pipe will be broken only, if the trace
> framework believes tracing is disabled. Recall the discussion about
> tracer_enabled = 0. Which is a bug, and I hoped Steven would have
> commented on how to fix that properly.
>
> Or was it fixed already, and this is a different issue?
> I didn't notice.

Actually there was two bugs which broke the pipe:
_ As you say the old one when none tracer put tracer_enabled = 0
_ And the new one I described here.

I think the first is fixed since none tracer has been replaced by "nop
tracer" (a recently implemented) which doesn't touch
tracer_enabled at all.