linux-kernel - Re: [PATCH] sched: fix/optimise calculation of weight-inverse

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Date:	Wed, 11 May 2011 21:49:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephan Bärwolf 
	<stephan.baerwolf@...ilmenau.de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nikhil Rao <ncrao@...gle.com>, Mike Galbraith <efault@....de>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: fix/optimise calculation of weight-inverse

On Wed, 2011-05-11 at 19:35 +0200, Stephan Bärwolf wrote:
> Thus the "err" of the old way can become very large (up to about  2^31 ).
> And of course the new error increases with increasing weight, it is
> still alway
> smaller than the oldway err (because oldway inv converts to newway inv)...

Your table got white-space mungled, but I'll take your word for it. I'll
give the patch a spin tomorrow (without the weight==0 bits), since by
brain officially gave up for today ;-)

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