linux-kernel - Re: [PATCH v5] sched: Avoid unnecessary work in reweight

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Message-ID: <20120227064423.GC28139@linux.vnet.ibm.com>
Date:	Mon, 27 Feb 2012 12:14:23 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] sched: Avoid unnecessary work in reweight_entity

* Michael Wang <wangyun@...ux.vnet.ibm.com> [2012-02-27 14:21:57]:
> I think I really need some study on cgroup first...I've done some totally useless 
> test :( ,

Yes!

> but still confused that why sys time reduced?

Could be just noise ..

> And I got a server with Redhat now, so I will do:
> 
> 1. cgcreate -g cpu:/subcg1
> 2. echo $$ > /cgroup/cpu/subcg1/tasks
> 3. open another shell
> 4. do 1~3 multi times, plan to get 7 cpu cgroup with 7 shell attached to each one.
> 5. run kernbench in each shell
> 
> Please tell me if I missed some thing :)

That should stress the cgroup-specific paths of scheduler!

-vatsa

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