Re: [PATCH 2/2 v4] sched: Rewrite per entity runnable load average tracking

[Yuyang Du]

On Wed, Jul 30, 2014 at 10:30:08AM +0200, Peter Zijlstra wrote:
> > 
> > Isn't the entire effort starting from PJT and Ben up to now to soften the extremely
> > dynamic changes (runnable or not, weight change, etc)? Assume task does not change
> > weight much, but group entity does as Peter mentioned.
> 
> No, softening isn't the point at all. But an integrator is the only
> means of predicting the future given the erratic past.
> 
> The whole point we got into this game is to better compute per cpu group
> weights, not to soften stuff, that's just a necessarily evil to more
> accurately predict erratic/unknown behaviour.
> 
> 
Yes, I totally agree. I think what I meant by "soften" is the *effect* of the integrator
that takes/averages the infinite history to predict the tufure.

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