Re: an idling kernel

Werner Almesberger (wa@almesberger.net)
Mon, 4 Nov 2002 16:16:36 -0300

Anu wrote:
> Im ready to be beaten up for asking this question ( I am not sure
> which group to post to -- all this is new to me) but, I was wondering how
> one could figure out if the kernel was in idle mode (or idling).

There's more to is than just processes: if your kernel has runnable
tasklets or pending interrupts, it is not truly idle, even though
there may be no runnable processes.

In umlsim, I have some heuristics that seem to catch most cases, but
may be a bit too paranoid. Look at timer.c:wait_kernel (called from
idle) in http://www.almesberger.net/umlsim/umlsim-4.tar.gz

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/