linux-kernel - Re: [PATCH 2/6] x86_64 UV: Use LED to indicate CPU is active

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Message-ID: <20080813095643.GA27074@atrey.karlin.mff.cuni.cz>
Date:	Wed, 13 Aug 2008 11:56:43 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/6] x86_64 UV: Use LED to indicate CPU is active

Hi!

> > +/*
> > + * Illuminate "activity" LED when CPU is going "active",
> > + * extinguish when going "idle".
> > + */
> > +static int uv_idle(struct notifier_block *nfb, unsigned long action, void *junk)
> > +{
> > +	if (action == IDLE_START)
> > +		uv_set_led_bits(0, LED_CPU_ACTIVITY);
> > +
> > +	else if (action == IDLE_END)
> > +		uv_set_led_bits(LED_CPU_ACTIVITY, LED_CPU_ACTIVITY);
> > +
> > +	return NOTIFY_OK;
> > +}
> > +
> > +static struct notifier_block uv_idle_notifier = {
> > +	.notifier_call = uv_idle,
> > +};
> >  
> > +/*
> > + * Initialize idle led callback function
> > + */
> > +static __init void uv_init_led_idle_display(void)
> > +{
> > +	/* initialize timer for activity monitor */
> > +	idle_notifier_register(&uv_idle_notifier);
> > +}
> 
> hm, i think this is a bad idea. While putting it into the go-to-idle 

Plus this really should not be uv-specific. We already have generic
triggers.

And you should really CC led maintainers!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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