linux-kernel - Re: [PATCH v2] tracing/filters: add run-time field descriptions to TRACE_EVENT

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Message-ID: <20090401122122.GF12966@elte.hu>
Date:	Wed, 1 Apr 2009 14:21:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tom Zanussi <tzanussi@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>, fweisbec@...il.com
Subject: Re: [PATCH v2] tracing/filters: add run-time field descriptions to
	TRACE_EVENT_FORMAT events


* Tom Zanussi <tzanussi@...il.com> wrote:

> The other is that for the really high-volume tracers e.g. the 
> function tracer, the volume of filtered events can be so high that 
> it pushes the unfiltered events out of the ring buffer before they 
> can be read so e.g. cat'ing the trace file repeatedly shows either 
> no output, or once in awhile some output but that isn't there the 
> next time you read the trace, which isn't what you normally expect 
> when reading the trace file. If you read from the trace_pipe file 
> though, you can catch them before they disappear.

yeah - this artifact of the ringbuffer needs to be fixed too. Steve, 
what's the plans on that?

	Ingo
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