Re: [PATCH 3/3] introduce task_rcu_dereference()

From: Peter Zijlstra
Date: Thu May 26 2016 - 07:34:53 EST

On Wed, May 18, 2016 at 09:57:33PM +0200, Oleg Nesterov wrote:
> Do we really want try_get_task_struct() here? How about the change below?
> To me it would be more clean to do get_task_struct() in task_numa_assign(),
> it clearly pairs with put_task_struct(best_task) and task_numa_compare()
> looks a bit simpler this way, no need to put_task_struct() if we nullify
> cur.
> What do you think? In any case I think the change in sched/fair.c should
> probably come as a separate patch, but this is up to you.

You are quite right. I've added your SoB to this patch if you don't
mind -- and I've attributed the task_rcu_dereference() thing to you too,
as all I did was copy paste different bits of your emails together while
trying to get my head around it ;-)