linux-kernel - Re: [PATCH] sched: rewrite the wrong annotation for select_task_rq

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Message-ID: <506FF5CA.2090704@linux.vnet.ibm.com>
Date:	Sat, 06 Oct 2012 17:11:38 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	svaidy@...ux.vnet.ibm.com
Subject: Re: [PATCH] sched: rewrite the wrong annotation for select_task_rq_fair()

On 10/06/2012 05:04 PM, Michael Wang wrote:
> On 09/26/2012 11:43 AM, Michael Wang wrote:
>> On 09/18/2012 04:16 PM, Michael Wang wrote:
>>> The annotation for select_task_rq_fair() is wrong since commit c88d5910, it's
>>> actually for a removed function.
>>>
>>> This patch rewrite the wrong annotation to make it correct.
>>
>> Could I get some comments on this patch?
> 
> Hmm...no comments for a month...is that because there some wrong
> understanding while explain the function or I didn't follow the rule?
> 
> Please let me know if I have made any mistake so I could do better in
> future ;-)

Oh, I just notice Peter is on CC list not the destination...My fault
again...

Regards,
Michael Wang

> 
> Regards,
> Michael Wang
> 
>>
>> Regards,
>> Michael Wang
>>
>>>
>>> Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
>>> ---
>>>  kernel/sched/fair.c |   14 ++++++++------
>>>  1 files changed, 8 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>>> index 6b800a1..35eb43a 100644
>>> --- a/kernel/sched/fair.c
>>> +++ b/kernel/sched/fair.c
>>> @@ -2682,15 +2682,17 @@ done:
>>>  }
>>>
>>>  /*
>>> - * sched_balance_self: balance the current task (running on cpu) in domains
>>> - * that have the 'flag' flag set. In practice, this is SD_BALANCE_FORK and
>>> - * SD_BALANCE_EXEC.
>>> + * select_task_rq_fair:
>>> + *	Select a suitable CPU for task p, in order to keep load balance.
>>>   *
>>> - * Balance, ie. select the least loaded group.
>>> + *	sd_flag:
>>> + *		the domain we try to balance should have "sd_flag" flag set.
>>>   *
>>> - * Returns the target CPU number, or the same CPU if no balancing is needed.
>>> + *	wake_flags:
>>> + *		indicate WF_SYNC.
>>>   *
>>> - * preempt must be disabled.
>>> + *	Must hold p->pi_lock and disable irq before invoke.
>>> + *	Return the CPU number for task p to running on.
>>>   */
>>>  static int
>>>  select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
>>>
>>
> 

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