Re: [-mm] Add an owner to the mm_struct (v9)

[Balbir Singh <balbir@linux.vnet.ibm.com>]

KAMEZAWA Hiroyuki wrote:
> maybe I don't undestand correctlly...
> 
> On Thu, 10 Apr 2008 14:46:02 +0530
> Balbir Singh <balbir@linux.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