Re: [RFC PATCH 0/3] sched: Introduce Window Assisted Load Tracking

[Peter Zijlstra]

On Fri, Oct 28, 2016 at 12:10:39AM -0700, Vikram Mulukutla wrote:
> 
> We propose Window-Assisted Load Tracking (WALT) as an alternative or additional
> load tracking scheme in lieu of or along with PELT, one that in our estimation
> better tracks task demand and CPU utilization especially for use cases on
> mobile devices. WALT was conceived by Srivatsa Vaddagiri to provide better
> perf-per-watt numbers on asymmetric CPU (frequency and/or IPC) implementations,
> (specifically on Qualcomm Snapgdragon chipsets running Android) and its metrics
> have been used to guide task placement and p-state selection (load balancing
> in CFS still uses PELT statistics). WALT is now present in the android-common
> kernel as well. 

And how come we only learn of it after its already shipping? Isn't that
arse backwards?