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From: David Wragg <david@wragg.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Albert Cahalan <acahalan@gmail.com>, linux-kernel@vger.kernel.org,
       bcrl@kvack.org
Subject: Re: [PATCH] procfs: export context switch counts in /proc/*/stat
References: <787b0d920612192140o37a28e8fnccdd51670cb9a766@mail.gmail.com>
	<878xh2aelz.fsf@wragg.org>
	<1166622487.3365.1386.camel@laptopd505.fenrus.org>
Date: Wed, 20 Dec 2006 14:38:06 +0000
In-Reply-To: <1166622487.3365.1386.camel@laptopd505.fenrus.org> (Arjan van de
	Ven's message of "Wed\, 20 Dec 2006 14\:48\:06 +0100")
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Arjan van de Ven <arjan@infradead.org> writes:
> if all you care is the number of context switches, you can use the
> following system tap script as well:
>
> http://www.fenrus.org/cstop.stp

Thanks, something similar to that might well have solved my original
problem.  

(When I try the script, stap complains about the lack of the kernel
debuginfo package, which of course doesn't exist for my self-built
kernel.  After hunting around on the web for 10 minutes, I'm still no
closer to resolving this.  But I look forward to playing with
systemtap once I get past that problem.)

Nonetheless, while systemtap might provide an objection to adding
per-task context switch counters to the kernel, it doesn't answer the
question, since we do have these counters, why not expose them in the
normal way?


David
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