linux-kernel - Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters

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Message-Id: <FFE6D792-4D6C-4F19-A939-CBA5F0654FBA@mac.com>
Date:	Thu, 24 Aug 2006 19:55:11 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	sekharan@...ibm.com
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, rohitseth@...gle.com,
	Rik van Riel <riel@...hat.com>,
	ckrm-tech@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	hugh@...itas.com, Ingo Molnar <mingo@...e.hu>,
	Kirill Korotaev <dev@...ru>, Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters

On Aug 24, 2006, at 19:48:28, Chandra Seetharaman wrote:
> On Thu, 2006-08-24 at 12:10 +0100, Alan Cox wrote:
>> All you need is
>>
>> struct wombat_controller
>> {
>> 	struct user_beancounter counter;
>> 	void (*wombat_pest_control)(struct wombat *w);
>> 	atomic_t wombat_population;
>> 	int (*wombat_destructor)(struct wombat *w);
>> };
>
> This may not solve the problem, as
>  - we won't be able get the controller data structure given the  
> beancounter data structure.

Of course you can!  This is what we do for linked lists too.  Here's  
an example of how to get a pointer to your wombat_controller given  
the user_beancounter pointer:
struct wombat_controller *wombat = containerof 
(ptr_to_user_beancounter, struct wombat_controller, counter);

The containerof(PTR, TYPE, MEMBER) returns a pointer to the parent  
object of type "TYPE" whose member "MEMBER" has address "PTR".

Cheers,
Kyle Moffett



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