linux-kernel - Re: Help Resource Counters Scale better (v4)

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Message-ID: <20090811150057.GY7176@balbir.in.ibm.com>
Date:	Tue, 11 Aug 2009 20:30:57 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"menage@...gle.com" <menage@...gle.com>, andi.kleen@...el.com,
	Pavel Emelianov <xemul@...nvz.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Help Resource Counters Scale better (v4)

* Prarit Bhargava <prarit@...hat.com> [2009-08-11 10:54:50]:

>
>
> Balbir Singh wrote:
>> Enhancement: Remove the overhead of root based resource counter accounting
>>
>>
>>   
>
> <snip>
>> Please test/review.
>>
>>   
> FWIW ...
>

Thanks for the testing!

> 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  
                                                     ^^^
                                        you mean (v4) right?
> patch, results in
>
> real    4m18.607s
> user    84m58.943s
> sys     50m52.682s
>

Without the patch and RESOURCE_COUNTERS do you see a big overhead. I'd
assume so, I am seeing it on my 24 way box that I have access to.

-- 
	Balbir
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