linux-kernel - Re: [sched] Out of memory: Kill process 2999 (rc) score 9 or sacrifice child

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Date:	Mon, 11 Aug 2014 10:11:33 +0400
From:	Kirill Tkhai <tkhai@...dex.ru>
To:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, "lkp@...org" <lkp@...org>
Subject: Re: [sched] Out of memory: Kill process 2999 (rc) score 9 or sacrifice child



10.08.2014, 19:31, "Oleg Nesterov" <oleg@...hat.com>:
> On 08/09, Peter Zijlstra wrote:
>>  That would suggest we're failing to do the TASK_DEAD thing properly, and
>>  ARGH! bloody obvious why, see the this_rq() comment right before the
>>  finish_task_switch() call in context_switch().
>
> Off-topic, but perhaps we can make this a bit more clear?
>
> Hmm. But after I actually did this change I can't understand if it makes
> this more clean or uglifies the code. See the patch below.
>
> OTOH, "int cpu" in __schedule() looks pointless and should die? Both
> rcu_note_context_switch() and wq_worker_sleeping() can use
> raw_smp_processor_id() ? In fact I think wq_worker_sleeping() doesn't
> need the "task" argument too.
>
> And... Doesn't schedule_tail() need preempt_enable() before
> finish_task_switch() ? IOW, shouldn't it do
>
>         #ifndef __ARCH_WANT_UNLOCKED_CTXSW
>                 preempt_disable();
>         #endif
>                 finish_task_switch();
>                 post_schedule(rq);
>
>                 preempt_enable();
>
> or I am totally confused?

You're sure, this was discussed here:

https://lkml.org/lkml/2014/2/14/243
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