linux-kernel - Re: scheduler scalability - cgroups, cpusets and load-balancing

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Date:	Tue, 29 Jan 2008 14:07:58 -0700
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Paul Jackson" <pj@....com>
Cc:	<a.p.zijlstra@...llo.nl>, <mingo@...e.hu>,
	<dmitry.adamushko@...il.com>, <rostedt@...dmis.org>,
	<menage@...gle.com>, <rientjes@...gle.com>, <tong.n.li@...el.com>,
	<tglx@...utronix.de>, <akpm@...ux-foundation.org>,
	<dhaval@...ux.vnet.ibm.com>, <vatsa@...ux.vnet.ibm.com>,
	<sgrubb@...hat.com>, <linux-kernel@...r.kernel.org>,
	<ebiederm@...ssion.com>, <nickpiggin@...oo.com.au>
Subject: Re: scheduler scalability - cgroups, cpusets and
	load-balancing

>>> On Tue, Jan 29, 2008 at  4:02 PM, in message
<20080129150234.b57ce988.pj@....com>, Paul Jackson <pj@....com> wrote: 
> Gregory wrote:
>> > ... (1) turning off
>> > sched_load_balance in any overlapping cpusets, including all
>> > encompassing parent cpusets, (2) leaving sched_load_balance on in the
>> > RT cpuset itself, and ...
>>
>> Technically you only need (2).  I run my 4-8 core development systems
>> in the single default global cpuset, normally.
> 
> Well, if you're running in the default cpuset, then you automatically get 
> (1),
> because sched_load_balance is turned off in all overlapping cpusets (there
> aren't any overlapping cpusets!)
> 
> So, yes, you -do- need both (1) and (2).  In your normal system, you
> just happen to get (1) effortlessly.


Ah.  Well see, I am just showing my ignorance of this area of the cpuset code then.  I stand corrected, and sorry for the noise. :)

-Greg

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