linux-kernel - Re: [PATCH] procfs: export context switch counts in /proc/*/stat

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Message-ID: <871wmuab01.fsf@wragg.org>
Date:	Wed, 20 Dec 2006 14:38:06 +0000
From:	David Wragg <david@...gg.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Albert Cahalan <acahalan@...il.com>, linux-kernel@...r.kernel.org,
	bcrl@...ck.org
Subject: Re: [PATCH] procfs: export context switch counts in /proc/*/stat

Arjan van de Ven <arjan@...radead.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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