linux-kernel - Re: [PATCH 2/2] cpuidle: Add a repeating pattern detector to the menu governor

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Message-ID: <20100510182746.7e923812@infradead.org>
Date:	Mon, 10 May 2010 18:27:46 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cpuidle: Add a repeating pattern detector to the
 menu governor

On Mon, 10 May 2010 14:38:50 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> > +	if (avg && stddev < STDDEV_THRESH)
> > +		data->predicted_us = avg;
> > +}
> 
> You got lucky there, because INTERVALS is a power of two.  If someone
> changes INTERVALS to 7, this code will ask for __udivdi3 and won't
> link on i364.

yeah you'd think it almost isn't an accident ;-)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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