linux-kernel - Re: [patch] mm, oom: remove unnecessary exit

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Message-ID: <20140730150615.GA20659@redhat.com>
Date:	Wed, 30 Jul 2014 17:06:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, oom: remove unnecessary exit_state check

On 07/29, David Rientjes wrote:
>
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -455,6 +455,7 @@ static void exit_mm(struct task_struct * tsk)
>  	task_unlock(tsk);
>  	mm_update_next_owner(mm);
>  	mmput(mm);
> +	clear_thread_flag(TIF_MEMDIE);
>  }
>  
>  /*
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -258,8 +258,6 @@ enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
>  		unsigned long totalpages, const nodemask_t *nodemask,
>  		bool force_kill)
>  {
> -	if (task->exit_state)
> -		return OOM_SCAN_CONTINUE;

IIRC, this check was a workaround, to ensure that a oom-killed zombie
can't block oom-killer.

I think this patch can equally work.

Oleg.

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