linux-kernel - Re: [PATCH 14/16] sched: make __update_entity_runnable

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Date:	Wed, 04 Jul 2012 19:20:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Venki Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ben Segall <bsegall@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [PATCH 14/16] sched: make __update_entity_runnable_avg() fast

On Wed, 2012-07-04 at 17:41 +0200, Peter Zijlstra wrote:
> On Wed, 2012-06-27 at 19:24 -0700, Paul Turner wrote:
> > +#define LOAD_AVG_MAX 46742 /* maximum possible load avg */
> 
> With 1024 * 1/(1-y), with y^32 = 0.5 I get 47788.. sup?

Ah, if we do the series starting at 1 we get: 1024*y/(1-y) which yields:
46764. So you're not adding the first term u_0?

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