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

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Message-ID: <20150819162323.GA20716@mtj.duckdns.org>
Date:	Wed, 19 Aug 2015 09:23:23 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Paul Turner <pjt@...gle.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 Wed, Aug 19, 2015 at 08:39:43AM +0900, Kamezawa Hiroyuki wrote:
> An actual per-thread use case in our customers is qemu-kvm + cpuset.
> customers pin each vcpus and qemu-kvm's worker threads to cpus.
> For example, pinning 4 vcpus to cpu 2-6 and pinning qemu main thread and
> others(vhost) to cpu 0-1.

taskset and/or teach qemu how to confiure its worker threads?

> This is an actual kvm tuning on our customers for performance guarantee.
> 
> In another case, cpu cgroup's throttling feature is used per vcpu for vm cpu sizing.

Yeap, this is something we likely want to implement in an accessible
way.  For kvm, per-thread throttling configuration is enough, right?

Thanks.

-- 
tejun
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