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

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Message-ID: <xm26fw90zo16.fsf@sword-of-the-dawn.mtv.corp.google.com>
Date:	Mon, 09 Jul 2012 13:18:29 -0700
From:	Benjamin Segall <bsegall@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Turner <pjt@...gle.com>, 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>,
	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

Correct, the sum is 1..n. The maximum was chosen as 516/46742 because
that is the point when the approximation of loop + fixed point math
being used reaches a maximum, even if the ideal y^n series would cap out
slightly differently.
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