linux-kernel - Re: [PATCH] Add hierarchical accounting to cpu accounting controller

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Date:	Thu, 06 Nov 2008 12:13:03 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	bharata@...ux.vnet.ibm.com
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] Add hierarchical accounting to cpu accounting controller

Bharata B Rao wrote:
> On Fri, Oct 31, 2008 at 09:40:41AM +0900, KAMEZAWA Hiroyuki wrote:
>> On Thu, 30 Oct 2008 22:46:22 +0530
>> Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:
>>> I disagree. The child is a part of the parent's hierarchy, and therefore
>>> its usage should reflect in the parent's usage.
>>>
>> In my point of view, there is no big difference. It's just whether we need a tool
>> in userland or not. If there is no performance impact, I have no objections.
>>
>> One request from me is add Documentation/controllers/cpuacct.txt or some to explain
>> "what we see".
> 
> I am not sure which version (mine or Li Zefan's) Paul prefers. I am
> resending my patch anyway with documentation and performance numbers
> included. I don't see any significant improvement or degradation in
> hackbench, lmbench and volanomark numbers with this patch.
> 
> Regards,
> Bharata.
> 
> Add hierarchical accounting to cpu accounting controller and cpuacct
> documentation.
> 
> Currently, while charging the task's cputime to its accounting group,
> the accounting group hierarchy isn't updated. This patch charges the cputime
> of a task to its accounting group and all its parent accounting groups.
> 
> Reported-by: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> Reviewed-by: Paul Menage <menage@...gle.com>

Looks good and straight forward.

Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

-- 
	Balbir
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