linux-kernel - Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource group and PRIO

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Message-ID: <1460574934.3775.77.camel@gmail.com>
Date:	Wed, 13 Apr 2016 21:15:34 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	mingo@...hat.com, lizefan@...wei.com, pjt@...gle.com,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-api@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCHSET RFC cgroup/for-4.6] cgroup, sched: implement resource
 group and PRIO_RGRP

On Wed, 2016-04-13 at 11:59 -0400, Tejun Heo wrote:

> Are you saying that you're aware that google or another big outfit is
> making active use of internal tasks competing against sibling cgroups
> for proportional CPU distribution?  If so, can you please be more
> specific?

What I'm aware of is a big outfit that moves thread pool workers in/out
of a large number of cpu/cpuacct cgroups.  What all a worker thread may
spawn in a cgroup, or find already there upon arrival and thus compete
with I do not know. 

I'm baffled by why anyone would care which entity competes with which
other entity.  An entity is an entity is an entity.

	-Mike