linux-kernel - Re: [-mm][PATCH 3/4] Add rlimit controller accounting and control

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Message-ID: <48245308.9010401@linux.vnet.ibm.com>
Date:	Fri, 09 May 2008 19:05:04 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>
CC:	linux-mm@...ck.org, Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm][PATCH 3/4] Add rlimit controller accounting and control

Paul Menage wrote:
> On Thu, May 8, 2008 at 7:35 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>>  I currently intend to use this controller for controlling memory related
>>  rlimits, like address space and mlock'ed memory. How about we use something like
>>  "memrlimit"?
> 
> Sounds reasonable.
> 
>>  Good suggestion, but it will be hard if not impossible to account the data
>>  correctly as it changes, if we do the accounting/summation at bind time. We'll
>>  need a really big lock to do it, something I want to avoid. Did you have
>>  something else in mind?
> 
> Yes, it'll be tricky but I think worthwhile. I believe it can be done
> without the charge/uncharge code needing to take a global lock, except
> for when we're actually binding/unbinding, with careful use of RCU.
> 

[snip]

This is an optimization that I am willing to consider later in the project. At
first I want to focus on functionality. I would like to optimize once I know
that the functionality has been well tested by a good base of users and make
sure that the optimization is real.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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