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Date: Tue, 11 Aug 2009 10:54:50 -0400
From: Prarit Bhargava <prarit@redhat.com>
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To: balbir@linux.vnet.ibm.com
CC: Andrew Morton <akpm@linux-foundation.org>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       "nishimura@mxp.nes.nec.co.jp" <nishimura@mxp.nes.nec.co.jp>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
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       Pavel Emelianov <xemul@openvz.org>,
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       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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Subject: Re: Help Resource Counters Scale better (v4)
References: <20090811144405.GW7176@balbir.in.ibm.com>
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Balbir Singh wrote:
> Enhancement: Remove the overhead of root based resource counter accounting
>
>
>   

<snip>
> Please test/review.
>
>   
FWIW ...

On a 64p/32G system running 2.6.31-git2-rc5, with RESOURCE_COUNTERS off, 
"time make -j64" results in

real    4m54.972s
user    90m13.456s
sys     50m19.711s

On the same system, running 2.6.31-git2-rc5, with RESOURCE_COUNTERS on,
plus Balbir's "Help Resource Counters Scale Better (v3)" patch, and this 
patch, results in

 real    4m18.607s
user    84m58.943s
sys     50m52.682s

P.