linux-kernel - Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats

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Message-ID: <1338377072.26856.263.camel@twins>
Date:	Wed, 30 May 2012 13:24:32 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	devel@...nvz.org, Paul Turner <pjt@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, handai.szj@...il.com,
	Andrew.Phillips@...x.com, Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct
 stats

On Wed, 2012-05-30 at 14:44 +0400, Glauber Costa wrote:
> But I don't really parse what you mean by "make the files go away". We 
> have just one file, with multiple entries. The entries are in key:value 
> form, so I don't see a huge problem in having some entries disappearing.
> 
> As a matter of fact, this is exactly what happens in /proc/stat when you 
> offline a cpu: the correspondent line will stop showing up.

Oh, I thought you had a file per cpu.

If you have content per cpu, this all might become a problem with 4096
cpus, that's bound to overflow the page of output space?
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