linux-kernel - Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

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Message-ID: <20150825092441.GA24131@gmail.com>
Date:	Tue, 25 Aug 2015 11:24:42 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Paul Turner <pjt@...gle.com>, Tejun Heo <tj@...nel.org>
Cc:	Tejun Heo <tj@...nel.org>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>, lizefan@...wei.com,
	cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified
 hierarchy


* Paul Turner <pjt@...gle.com> wrote:

> > Anyways, a point here is that threads of the same process competing
> > isn't a new problem.  There are many ways to make those threads play
> > nice as the application itself often has to be involved anyway,
> > especially for something like qemu which is heavily involved in
> > provisioning resources.
> 
> It's certainly not a new problem, but it's a real one, and it's
> _hard_.  You're proposing removing the best known solution.

Also, just to make sure this is resolved properly, I'm NAK-ing the current 
scheduler bits in this series:

  NAKed-by: Ingo Molnar <mingo@...nel.org>

until all of pjt's API design concerns are resolved. This is conceptual, it is not 
a 'we can fix it later' detail.

Tejun, please keep me Cc:-ed to future versions of this series so that I can lift 
the NAK if things get resolved.

Thanks,

	Ingo
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