Re: [PATCH v2] tracing/filters: add run-time field descriptions toTRACE_EVENT_FORMAT events

From: Ingo Molnar
Date: Wed Apr 01 2009 - 08:21:41 EST



* Tom Zanussi <tzanussi@xxxxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/