Re: [RFC,v2 3/3] sched: ignore task_h_load for CPU_NEWLY_IDLE

[Peter Zijlstra]

On Wed, Feb 08, 2017 at 09:43:29AM +0100, Uladzislau Rezki wrote:
> From: Uladzislau 2 Rezki <uladzislau2.rezki@xxxxxxxxxxxxxx>
> 
> A load balancer calculates imbalance factor for particular shed
> domain and tries to steal up the prescribed amount of weighted load.
> However, a small imbalance factor would sometimes prevent us from
> stealing any tasks at all. When a CPU is newly idle, it should
> steal first task which passes a migration criteria.
> 

So ideally we'd reduce the number of special cases instead of increase
them. Does this patch make an actual difference, if so how much and with
what workload?

Also, I suppose that if we finally manage to parameterize the whole
load-balancing to act on: nr_running/util/load depending on the domain
this all naturally falls into place.