Re: [PATCH v6 0/2] sched/fair: update scale invariance of PELT

[Dietmar Eggemann]

On 11/9/18 8:20 AM, Vincent Guittot wrote:
> This new version of the scale invariance patchset adds an important change
> compare to v3 and before. It still scales the time to reflect the
> amount of work that has been done during the elapsed running time but this is
> now done at rq level instead of per entity and rt/dl/cfs_rq. The main
> advantage is that it is done once per clock update and we don't need to
> maintain per sched_avg's stolen_idle_time anymore. This also ensures that
> all pelt signals will be always synced for a rq.
>
> The 1st patch makes available rq_of() helper function for pelt.c file and
> the 2nd patch implements the new scaling algorithm
>
> Changes since v5:
> - Fix running_sum scaling in update_tg_cfs_runnable() raised by Dietmar
> - Remove unused cpu parameters raised by Dietmar

I just re-discovered ... the comment for the definition of struct 
sched_avg in include/linux/sched.h also mentioned the different ways how 
we do invariance for load_avg and util_avg.

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