linux-kernel - Re: [PATCH v2 14/14] Change CPUACCT to default n

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Message-ID: <1322141073.2921.51.camel@twins>
Date:	Thu, 24 Nov 2011 14:24:33 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Glauber Costa <glommer@...allels.com>,
	Balbir Singh <bsingharora@...il.com>,
	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org,
	paul@...lmenage.org, lizf@...fujitsu.com, daniel.lezcano@...e.fr,
	jbottomley@...allels.com, fweisbec@...il.com
Subject: Re: [PATCH v2 14/14] Change CPUACCT to default n

On Mon, 2011-11-21 at 10:59 +0900, KAMEZAWA Hiroyuki wrote:
> Could you share your analysis why cpuacct cgroup is slow ?

It adds accounting to all scheduler hot paths, accounting that is mostly
duplicate of accounting already done. It also does another cgroup
hierarchy walk, separate from existing controllers, hitting all cold
cachelines again.

IOW, it sucks chunks and I should never have allowed it to be merged.
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