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

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Message-Id: <1201604243.28547.101.camel@lappy>
Date:	Tue, 29 Jan 2008 11:57:22 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, vatsa <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Paul Jackson <pj@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steve Grubb <sgrubb@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	"Li, Tong N" <tong.n.li@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Menage <menage@...gle.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: scheduler scalability - cgroups, cpusets and load-balancing


Here I go, talking to myself..

On Tue, 2008-01-29 at 10:53 +0100, Peter Zijlstra wrote:

> My thoughts were to make stronger use of disjoint cpu-sets. cgroups and
> cpusets are related, in that cpusets provide a property to a cgroup.
> However, load_balance_monitor()'s interaction with sched domains
> confuses me - it might DTRT, but I can't tell.
> 
> [ It looks to me it balances a group over the largest SD the current cpu
>   has access to, even though that might be larger than the SD associated
>   with the cpuset of that particular cgroup. ]

Hmm, with a bit more thought I think that does indeed DTRT. Because, if
the cpu belongs to a disjoint cpuset, the highest sd (with
load-balancing enabled) would be that. Right?

[ Just a bit of a shame we have all cgroups represented on each cpu. ]

Also, might be a nice idea to split the daemon up if there are indeed
disjoint sets - currently there is only a single daemon which touches
the whole system.

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