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

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Message-ID: <CADZ9YHio6QkM3mQJrPFd-Pac_+o5BcHx=Qb7ppfx4OKgfq4Fhg@mail.gmail.com>
Date:	Mon, 16 Jan 2012 23:26:24 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	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 7:00 PM, Hillf Danton <dhillf@...il.com> wrote:
> On Mon, Jan 16, 2012 at 4:27 PM, Rakib Mullick <rakib.mullick@...il.com> wrote:
>> On Mon, Jan 16, 2012 at 1:53 PM, Michael Wang
>> <wangyun@...ux.vnet.ibm.com> wrote:
>>> I think the task in rq->wake_list should already have state:TASK_WAKING,
>>> because it's a wake list.
>>>
>> But, what I got by means of TASK_WAKING is this task is about to RUN,
>> very soon it'll have TASK_RUNNING state. And, if I hadn't miss any
>> portion of code, then rq->wake_list doesn't have TASK_WAKING state.
>>
> Hi Rakib
>
> The question maybe settled down by adding a BUG_ON or similar to
> capture what you concern, and wait results while drinking tea or
> coffee.
>
Hi Hillf,

Thanks for your suggestions, will apply this technique when some new
confusion arises. Now, it's quite clear :)

Thanks,
Rakib
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