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

[Benjamin Segall]

li guang <lig.fnst@xxxxxxxxxxxxxx> writes:

> å 2012-10-24äç 02:43 -0700ïtip-bot for Paul Turneråéï
>> +		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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