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

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Message-ID: <20150825211342.GF26785@mtj.duckdns.org>
Date:	Tue, 25 Aug 2015 17:13:42 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Paul Turner <pjt@...gle.com>,
	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

Hello, Kame.

On Tue, Aug 25, 2015 at 11:36:25AM +0900, Kamezawa Hiroyuki wrote:
> I think I should explain my customer's use case of qemu + cpuset/cpu (via libvirt)
> 
> (1) Isolating hypervisor thread.
>    As already discussed, hypervisor threads are isolated by cpuset. But their purpose
>    is to avoid _latency_ spike caused by hypervisor behavior. So, "nice" cannot be solution
>    as already discussed.
> 
> (2) Fixed rate vcpu service.
>    With using cpu controller's quota/period feature, my customer creates  vcpu models like
>    Low(1GHz), Mid(2GHz), High(3GHz) for IaaS system.
> 
>    To do this, each vcpus should be quota-limited independently, with per-thread cpu control.
> 
> Especially, the method (1) is used in several enterprise customers for stabilizing their system.
> 
> Sub-process control should be provided by some way.

Can you please take a look at the proposal on my reply to Paul's
email?  AFAICS, both of above cases should be fine with that.

Thanks.

-- 
tejun
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