linux-kernel - Re: [PATCH repost] sched: export sched

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Message-ID: <4C2E2987.9040702@us.ibm.com>
Date:	Fri, 02 Jul 2010 11:01:43 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitri Vorobiev <dmitri.vorobiev@...ial.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH repost] sched: export sched_set/getaffinity to modules

On 7/1/2010 7:55 AM, Peter Zijlstra wrote:
> On Thu, 2010-07-01 at 16:53 +0200, Tejun Heo wrote:
>    
>> Hello,
>>
>> On 07/01/2010 04:46 PM, Oleg Nesterov wrote:
>>      
>>>> It might be a good idea to make the function take extra clone flags
>>>> but anyways once created cloned task can be treated the same way as
>>>> other kthreads, so nothing else needs to be changed.
>>>>          
>>> This makes kthread_stop() work. Otherwise the new thread is just
>>> the CLONE_VM child of the caller, and the caller is the user-mode
>>> task doing ioctl() ?
>>>        
>> Hmmm, indeed.  It makes the attribute inheritance work but circumvents
>> the whole reason there is kthreadd.
>>      
> I thought the whole reason there was threadd was to avoid the
> inheritance? So avoiding the avoiding of inheritance seems like the goal
> here, no?
>    
I think so. Does  it (Tejun's kthread_clone() patch) also  inherit the 
cgroup of the caller? or do we still need the explicit
call to attach the thread to the current task's cgroup?

I am on vacation next week and cannot look into this until Jul 12. Hope 
this will be resoved by then.
If not, i will look into after i am back.

Thanks
Sridhar

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