Re: [PATCH] sched: At sched_fork use __set_task_cpu().

[Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>]

* Rakib Mullick <rakib.mullick@gmail.com> [2012-01-29 22:34:37]:

>  We don't use select_task_rq() from sched_fork() anymore and no chance of task gets migrated at
> this point. Therefore, we can avoid task migration related checking/accounting, so use
> __set_task_cpu() instead of set_task_cpu().
> 
> Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
  Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
> ---
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index df00cb0..a38026e 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1755,7 +1755,7 @@ void sched_fork(struct task_struct *p)
>  	 * Silence PROVE_RCU.
>  	 */
>  	raw_spin_lock_irqsave(&p->pi_lock, flags);
> -	set_task_cpu(p, cpu);
> +	__set_task_cpu(p, cpu);
>  	raw_spin_unlock_irqrestore(&p->pi_lock, flags);
> 
>  #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
> 
> 
> --