linux-kernel - Re: [PATCH 0/9] Per-cgroup /proc/stat

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Message-ID: <m2fwjyg9fx.fsf@firstfloor.org>
Date:	Wed, 14 Sep 2011 13:23:14 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, xemul@...allels.com,
	paul@...lmenage.org, lizf@...fujitsu.com, daniel.lezcano@...e.fr,
	mingo@...e.hu, jbottomley@...allels.com
Subject: Re: [PATCH 0/9] Per-cgroup /proc/stat

Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:
>
> Guys we should seriously trim back a lot of that code, not grow ever
> more and more. The sad fact is that if you build a kernel with
> cpu-cgroup support the context switch cost is more than double that of a
> kernel without, and then you haven't even started creating cgroups yet.

That sounds indeed quite bad. Is it known why it is so costly?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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