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

[David Wragg <david@wragg.org>]

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