linux-kernel - Re: [-mm] Add an owner to the mm

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Date:	Mon, 7 Apr 2008 19:55:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	menage@...gle.com, xemul@...nvz.org, hugh@...itas.com,
	skumar@...ux.vnet.ibm.com, yamamoto@...inux.co.jp,
	lizf@...fujitsu.com, linux-kernel@...r.kernel.org,
	taka@...inux.co.jp, linux-mm@...ck.org, rientjes@...gle.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [-mm] Add an owner to the mm_struct (v8)

On Tue, 08 Apr 2008 08:09:57 +0530 Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> Andrew Morton wrote:
> > On Fri, 04 Apr 2008 13:35:44 +0530
> > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > 
> >> 1. Add mm->owner change callbacks using cgroups
> >>
> >> ...
> >>
> >> +config MM_OWNER
> >> +	bool "Enable ownership of mm structure"
> >> +	help
> >> +	  This option enables mm_struct's to have an owner. The advantage
> >> +	  of this approach is that it allows for several independent memory
> >> +	  based cgroup controllers to co-exist independently without too
> >> +	  much space overhead
> >> +
> >> +	  This feature adds fork/exit overhead. So enable this only if
> >> +	  you need resource controllers
> > 
> > Do we really want to offer this option to people?  It's rather a low-level
> > thing and it's likely to cause more confusion than it's worth.  Remember
> > that most kernels get to our users via kernel vendors - to what will they
> > be setting this config option?
> > 
> 
> I suspect that this kernel option will not be explicitly set it. This option
> will be selected by other config options (memory controller, swap namespace,
> revoke*)

I believe that the way to do this is to not give the option a `help'
section.  Tht makes it a Kconfig-internal-only thing.

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