Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c

From: shenghui
Date: Tue Jun 29 2010 - 07:24:27 EST

2010/6/29 Peter Zijlstra <peterz@xxxxxxxxxxxxx>:
> On Tue, 2010-06-29 at 15:10 +0800, shenghui wrote:
>> I think some lock on the metadata can fix this issue, but we may
>> change plenty of code to add support for lock. I think the easist
>> way is just substacting nr_running before dequing tasks.
> But all that is fully serialized by the rq->lock.. so I'm really not
> seeing how this can happen.

I wonder is there any chance set_next_entity() can get NULL for
parameter se if so?
And will you please give me some instructions on where rq->lock
is required?


Thanks and Best Regards,
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