Re: 4.3 group scheduling regression

[Peter Zijlstra]

On Tue, Oct 13, 2015 at 03:32:47AM +0800, Yuyang Du wrote:
> On Mon, Oct 12, 2015 at 01:47:23PM +0200, Peter Zijlstra wrote:
> > 
> > Also, should we do the below? At this point se->on_rq is still 0 so
> > reweight_entity() will not update (dequeue/enqueue) the accounting, but
> > we'll have just accounted the 'old' load.weight.
> > 
> > Doing it this way around we'll first update the weight and then account
> > it, which seems more accurate.
>  
> I think the original looks ok.
> 
> The account_entity_enqueue() adds child entity's load.weight to parent's load:
> 
> update_load_add(&cfs_rq->load, se->load.weight)
> 
> Then recalculate the shares.
> 
> Then reweight_entity() resets the parent entity's load.weight.

Yes, some days I should just not be allowed near a keyboard :)
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