linux-kernel - Re: [Patch 0/5] I/O statistics through request queues

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Message-ID: <453E7B1F.7020602@cfl.rr.com>
Date:	Tue, 24 Oct 2006 16:44:15 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Martin Peschke <mp3@...ibm.com>
CC:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [Patch 0/5] I/O statistics through request queues

Martin Peschke wrote:
> Well, the instrumentation "on demand" aspect is half of the truth.
> A probe inserted through kprobes impacts performance more than static
> instrumentation.

True, but given that there are going to be a number of things you might 
want to instrument at some point, and that at any given time you might 
only be interested in a few of those, it likely will be better overall 
to spend some more time only on the few than less time on the many.


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