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

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Message-ID: <20150824214000.GL28944@mtj.duckdns.org>
Date:	Mon, 24 Aug 2015 17:40:00 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	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

On Mon, Aug 24, 2015 at 02:19:29PM -0700, Paul Turner wrote:
> > Would it be possible for you to give realistic and concrete examples?
> > I'm not trying to play down the use cases but concrete examples are
> > usually helpful at putting things in perspective.
> 
> I don't think there's anything that's not realistic or concrete about
> the example above.  The "suppose" parts were only for qualifying the
> pool sizes for vcpu and non-vcpu threads above since discussion of
> implementation using nice is dependent on knowing these counts.

Hmm... I was hoping for an actual configurations and usage scenarios.
Preferably something people can set up and play with.  I take that the
CPU intensive helper threads are usually IO workers?  Is the scenario
where the VM is set up with a lot of IO devices and different ones may
consume large amount of CPU cycles at any given point?

Thanks.

-- 
tejun
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