linux-kernel - Re: [tip:sched/core] sched: Track the runnable average on a per-task entity basis

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Message-ID: <xm26r4om7alf.fsf@sword-of-the-dawn.mtv.corp.google.com>
Date:	Thu, 25 Oct 2012 09:58:04 -0700
From:	Benjamin Segall <bsegall@...gle.com>
To:	li guang <lig.fnst@...fujitsu.com>
Cc:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, pjt@...gle.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Track the runnable average on a per-task entity basis

li guang <lig.fnst@...fujitsu.com> writes:

> 在 2012-10-24三的 02:43 -0700，tip-bot for Paul Turner写道：
>> +		do {
>> +			if (runnable)
>> +				sa->runnable_avg_sum += delta_w;
>> +			sa->runnable_avg_period += delta_w;
>> +
>> +			/*
>> +			 * Remainder of delta initiates a new period, roll over
>> +			 * the previous.
>> +			 */
>> +			sa->runnable_avg_sum =
>> +				decay_load(sa->runnable_avg_sum, 1);
>
> Is this u0+u1*y+u2*y^2+u3*y^3 ...,
> seems no, this is u0+u1*y+u2*y+u3*y+u4*y ...
>
It is cumulative, so it is u0+y*(u1+y*(u2+..., which is u0+u1*y+u2*y^2+...
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