linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <20060916234047.GA26846@elte.hu>
Date:	Sun, 17 Sep 2006 01:40:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Jes Sorensen <jes@....com>, Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	karim@...rsys.com, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> > > Third run : same LTTng instrumentation, with a kprobe handler 
> > > triggered by each event traced.
> > 
> > where exactly did you put the kprobe handler?
> 
> ltt_relay_reserve_slot.
> 
> See http://ltt.polymtl.ca/svn/tests/kernel/test-kprobes.c to insert 
> the kprobe. Tests done on LTTng 0.5.111, on a x86 3GHz with 
> hyperthreading.

ok. In what way did you enable LTTng instrumentation? I have 0.5.108 
installed, and i'd like to make sure i do everything as you did, to make 
the tests comparable. Which kernel config options (default ones?), and 
what precise lttcl commands did you use, were they the usual:

  lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/trace

? What filesystem does /tmp/trace reside on?

	Ingo
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