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

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Message-ID: <e873dfbb-d13e-93c7-251e-dea90c3b40b5@arm.com>
Date:   Mon, 12 Nov 2018 18:58:13 -0800
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>, peterz@...radead.org,
        mingo@...nel.org, linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, Morten.Rasmussen@....com,
        patrick.bellasi@....com, pjt@...gle.com, bsegall@...gle.com,
        thara.gopinath@...aro.org, pkondeti@...eaurora.org,
        quentin.perret@....com
Subject: Re: [PATCH v6 0/2] sched/fair: update scale invariance of PELT

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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