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

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Message-Id: <479F06A4.BA47.005A.0@novell.com>
Date:	Tue, 29 Jan 2008 08:57:40 -0700
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Paul Jackson" <pj@....com>
Cc:	<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  7:12 AM, in message
<20080129061202.95b66041.pj@....com>, Paul Jackson <pj@....com> wrote: 
> Peter, replying to Paul:
>> >  3) you turn off sched_load_balance in that realtime cpuset.
>> 
>> Ah, I don't think 3 is needed. Quite to the contrary, there is quite a
>> large body of research work covering the scheduling of (hard and soft)
>> realtime tasks on multiple cpus.
> 
> Well, the way it's coded now, the user space code needs to do (3),
> because that's the only way they get the system to have anything
> other than one big fat sched domain covering the all the CPUs in
> the system.

What about exclusive cpusets?  Don't they create a new sched-domain or did I misunderstand there?

-Greg

> 
> Actually ... I need a picture of a bunny with a pancake hat here,
> as I have no idea what you just said ;).




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