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

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Message-ID: <47FEE89A.1010102@linux.vnet.ibm.com>
Date:	Fri, 11 Apr 2008 09:57:06 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Paul Menage <menage@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [-mm] Add an owner to the mm_struct (v9)

KAMEZAWA Hiroyuki wrote:
> maybe I don't undestand correctlly...
> 
> On Thu, 10 Apr 2008 14:46:02 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
>>  
>> +config MM_OWNER
>> +	bool
>> +
> no default is ok here  ? what value will this have if not selected ?
> I'm sorry if I misunderstand Kconfig.
> 

The way this works is

If I select memory resource controller, CONFIG_MM_OWNER is set to y, else it
does not even show up in the .config

> 
>> +	/*
>> +	 * Search through everything else. We should not get
>> +	 * here often
>> +	 */
>> +	do_each_thread(g, c) {
>> +		if (c->mm == mm)
>> +			goto assign_new_owner;
>> +	} while_each_thread(g, c);
>> +
> 
> Again, do_each_thread() is suitable here ?
> for_each_process() ?
> 

do_each_thread(), while_each_thread() walks all processes and threads of those
processes in the system. It is a common pattern used in the kernel (see
try_to_freeze_tasks() or oom_kill_task() for example).

> Thanks,
> -Kame
> 


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