linux-kernel - Re: [RFC PATCH 0/3] Aggregate task utilization only on root cfs

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Message-ID: <57505375.4060009@arm.com>
Date:	Thu, 2 Jun 2016 16:40:37 +0100
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Ben Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Yuyang Du <yuyang.du@...el.com>
Subject: Re: [RFC PATCH 0/3] Aggregate task utilization only on root cfs_rq

On 01/06/16 21:10, Peter Zijlstra wrote:
> On Wed, Jun 01, 2016 at 08:39:19PM +0100, Dietmar Eggemann wrote:
>> This is an alternative approach to '[RFC PATCH v2] sched: reflect
>> sched_entity movement into task_group's utilization' which requires
>> '[RFC PATCH] sched: fix hierarchical order in rq->leaf_cfs_rq_list'
> 
> Awesome, a 3rd alternative :-)

Yeah, sorry, but at least it runs op tip/sched/core w/o any other PELT
related changes.

Moreover, it's less code changes compared to the reflect-thing.

And Yuyang's implementation depended on the optimization of
_update_load_avg() (1us->1ms) which IMHO turned out to be not working.