Re: [PATCH] Linux Kernel Markers - Support Multiple Probes

[Mathieu Desnoyers]

* Christoph Hellwig (hch@xxxxxxxxxxxxx) 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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