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From: Ingo Molnar <mingo@elte.hu>
To: Tom Zanussi <tzanussi@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	fweisbec@gmail.com
Subject: Re: [PATCH v2] tracing/filters: add run-time field descriptions to TRACE_EVENT_FORMAT events
Date: Wed, 1 Apr 2009 14:21:22 +0200	[thread overview]
Message-ID: <20090401122122.GF12966@elte.hu> (raw)
In-Reply-To: <1238478529.6749.12.camel@bookworm>


* Tom Zanussi <tzanussi@gmail.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

      reply	other threads:[~2009-04-01 12:21 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-31  5:48 [PATCH v2] tracing/filters: add run-time field descriptions to TRACE_EVENT_FORMAT events Tom Zanussi
2009-04-01 12:21 ` Ingo Molnar [this message]

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