Re: [PATCH] Create new LED trigger for CPU activity

[Pavel Machek <pavel@ucw.cz>]

Hi!

> This patch creates a new LED trigger that triggers whenever the CPU is
> active.  It can be configured with module parameters to trigger on any
> combination of user, nice, system, or iowait time, and defaults to
> including user and system time but not nice or iowait time.  I've tested
> it a bit, and it seems to work, but no guarantees.  It's diffed against
> 2.6.17-git25.
> 
> Signed-off-by: Thomas Tuttle <thinkinginbinary@gmail.com>

I like the idea.. CPU usage led is very useful, and old led system
actually provided it. But...

> +/*
> + * ChangeLog:
> + *
> + * Revision 3 (2006/06/06):
> + *   Added module parameters to configure which time is counted as CPU
> + *     activity. (thanks to Andrew Morton)
> + *
> + * Revision 2 (2006/06/05):
> + *   Diffed against 2.6.17-git25 instead of 2.6.17.1.
> + *   Fixed several code style issues (thanks to Randy Dunlap)
> + *
> + * Revision 1 (2006/06/05):
> + *   Initial patch submitted.
> + */

Please don't include changelogs in sources.

> +#define UPDATE_INTERVAL (5) /* delay between updates, in ms */

Polling every 5 msec is going to cost _lot_ of juice. Is there a
better way?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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