linux-kernel - Re: Tiny cpusets -- cpusets for small systems?

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Message-Id: <20080225120050.AE81.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Mon, 25 Feb 2008 12:10:43 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Paul Jackson <pj@....com>, Pavel Machek <pavel@....cz>
Cc:	kosaki.motohiro@...fujitsu.com,
	"Max Krasnyanskiy" <maxk@...lcomm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andreas Dilger <adilger@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Spang <daniel.spang@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jon Masters <jonathan@...masters.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Tiny cpusets -- cpusets for small systems?

Hi Pual

> Looking at some IA64 sn2 config builds I have laying about, I see the
> following text sizes for a couple of versions, showing the growth of
> the cpuset/cgroup apparatus over time:
> 
> 	25933	2.6.18-rc3-mm1/kernel/cpuset.o (Aug 2006)
> vs.
> 	37823	2.6.25-rc2-mm1/kernel/cgroup.o (Feb 2008)
> 	19558	2.6.25-rc2-mm1/kernel/cpuset.o
> 
> So the total has grown from 25933 to 57381 text bytes (note that
> this is IA64 arch; most arch's will have proportionately smaller
> text sizes.)

hm, interesting.
but unfortunately the cpuset have more than depend.(i.e. CONFIG_SMP)

To more bad thing, some embedded cpu have poor or no atomic instruction
support.
at that, turn on CONFIG_SMP become large performace regression ;)


I am not already embedded engineer.
thus, I might have made a mistake.
(BTW: I am large server engineer now)

but no thinking dependency is wrong, may be.


Pavel, what do you think it?

- kosaki


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