From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
Mike Mason <mmlnx@us.ibm.com>,
Dipankar Sarma <dipankar@in.ibm.com>
Subject: Re: [PATCH] Linux Kernel Markers - Support Multiple Probes
Date: Thu, 22 Nov 2007 07:00:56 -0500 [thread overview]
Message-ID: <20071122120056.GA6134@Krystal> (raw)
In-Reply-To: <20071122100658.GA2738@infradead.org>
* Christoph Hellwig (hch@infradead.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
prev parent reply other threads:[~2007-11-22 12:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-22 3:41 [PATCH] Linux Kernel Markers - Support Multiple Probes Mathieu Desnoyers
2007-11-22 10:06 ` Christoph Hellwig
2007-11-22 12:00 ` Mathieu Desnoyers [this message]
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