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Date: Fri, 29 Jun 2012 12:11:39 -0400
From: Rik van Riel <riel@redhat.com>
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Subject: Re: [PATCH 09/40] autonuma: introduce kthread_bind_node()
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Hillf Danton <dhillf@gmail.com>, Dan Smith <danms@us.ibm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>, Suresh Siddha <suresh.b.siddha@intel.com>, Mike Galbraith <efault@gmx.de>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Bharata B Rao <bharata.rao@gmail.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Johannes Weiner <hannes@cmpxchg.org>, Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>, Christoph Lameter <cl@linux.com>, Alex Shi <alex.shi@intel.com>, Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Don Morris <don.morris@hp.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>

On 06/29/2012 12:04 PM, Peter Zijlstra wrote:
> On Fri, 2012-06-29 at 11:36 -0400, Rik van Riel wrote:
>> On 06/28/2012 08:55 AM, Andrea Arcangeli wrote:
>>
>>> --- a/include/linux/sched.h
>>> +++ b/include/linux/sched.h
>>> @@ -1792,7 +1792,7 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
>>>    #define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
>>>    #define PF_SPREAD_PAGE	0x01000000	/* Spread page cache over cpuset */
>>>    #define PF_SPREAD_SLAB	0x02000000	/* Spread some slab caches over cpuset */
>>> -#define PF_THREAD_BOUND	0x04000000	/* Thread bound to specific cpu */
>>> +#define PF_THREAD_BOUND	0x04000000	/* Thread bound to specific cpus */
>>>    #define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
>>>    #define PF_MEMPOLICY	0x10000000	/* Non-default NUMA mempolicy */
>>>    #define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
>>
>> Changing the semantics of PF_THREAD_BOUND without so much as
>> a comment in your changelog or buy-in from the scheduler
>> maintainers is a big no-no.
>
> In fact I've already said a number of times this patch isn't going
> anywhere.

Which is probably fine, because I see no reason why Andrea's
numa threads would need PF_THREAD_BOUND in the first place.

Andrea?

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