linux-kernel - Re: [Question] sched: Should nr_uninterruptible be decremented in ttwu_do

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Message-ID: <CADZ9YHgZcuoZ4_az3taqv2GJ_5mLKLmyOAUz2ZnA3G1YMLi1_w@mail.gmail.com>
Date:	Mon, 16 Jan 2012 23:22:09 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Question] sched: Should nr_uninterruptible be decremented in ttwu_do_activate()?

On Mon, Jan 16, 2012 at 3:22 PM, Michael Wang
<wangyun@...ux.vnet.ibm.com> wrote:
> On 01/16/2012 04:27 PM, Rakib Mullick wrote:
>
>> On Mon, Jan 16, 2012 at 1:53 PM, Michael Wang
>
> I saw this is the way to enqueue wake_list:
>
> try_to_wake_up --> p->state = TASK_WAKING; --> ttwu_queue -->
> ttwu_queue_remote --> llist_add(&p->wake_entry, &cpu_rq(cpu)->wake_list)
>
Yes, right and if the task needs to wakeup on a remote CPU, then it
follows an reschedule IPI. But, what I was missing that, I wasn't sure
whether task gets added to wake_list only from ttwu_queue_remote() or
not. Now, I've found that - it is and you are right rq->wake_list only
have TASK_WAKING state.

> BTW, I'm just start to learn scheduler, may be I'm wrong, let's find out
> the right answer :)
>
I think it's quite clear to me now. And you are learning scheduler
well at-least better than me :)

Thanks,
Rakib
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