linux-kernel - Re: [PATCH] Linux Kernel Markers

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Message-ID: <20071122120056.GA6134@Krystal>
Date:	Thu, 22 Nov 2007 07:00:56 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Mike Mason <mmlnx@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [PATCH] Linux Kernel Markers - Support Multiple Probes

* Christoph Hellwig (hch@...radead.org) wrote:
> On Wed, Nov 21, 2007 at 10:41:26PM -0500, Mathieu Desnoyers wrote:
> > RCU style multiple probes support for the Linux Kernel Markers.
> 
> Why would we want this?
> 

If we want to have more than one probe connected to a marker at a given
time (LTTng, or blktrace, ssytemtap) then we need this patch. Without it,
connecting a second probe handler to a marker will fail.

It allow us, for instance, to do interesting combinations :

Do standard tracing with LTTng and, eventually, to compute statistics
with SystemTAP, or to have a special trigger on an event that would call
a systemtap script which would stop flight recorder tracing.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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