linux-kernel - Re: [patch -mm 2/2] mm, oom: remove unnecessary variable

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Date:	Wed, 15 Jul 2015 11:33:36 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch -mm 2/2] mm, oom: remove unnecessary variable

On Tue 14-07-15 16:45:13, David Rientjes wrote:
> The "killed" variable in out_of_memory() can be removed since the call to
> oom_kill_process() where we should block to allow the process time to
> exit is obvious.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/oom_kill.c | 21 ++++++++-------------
>  1 file changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -645,7 +645,6 @@ bool out_of_memory(struct oom_control *oc)
>  	unsigned long freed = 0;
>  	unsigned int uninitialized_var(points);
>  	enum oom_constraint constraint = CONSTRAINT_NONE;
> -	int killed = 0;
>  
>  	if (oom_killer_disabled)
>  		return false;
> @@ -653,7 +652,7 @@ bool out_of_memory(struct oom_control *oc)
>  	blocking_notifier_call_chain(&oom_notify_list, 0, &freed);
>  	if (freed > 0)
>  		/* Got some memory back in the last second. */
> -		goto out;
> +		return true;
>  
>  	/*
>  	 * If current has a pending SIGKILL or is exiting, then automatically
> @@ -666,7 +665,7 @@ bool out_of_memory(struct oom_control *oc)
>  	if (current->mm &&
>  	    (fatal_signal_pending(current) || task_will_free_mem(current))) {
>  		mark_oom_victim(current);
> -		goto out;
> +		return true;
>  	}
>  
>  	/*
> @@ -684,7 +683,7 @@ bool out_of_memory(struct oom_control *oc)
>  		get_task_struct(current);
>  		oom_kill_process(oc, current, 0, totalpages, NULL,
>  				 "Out of memory (oom_kill_allocating_task)");
> -		goto out;
> +		return true;
>  	}
>  
>  	p = select_bad_process(oc, &points, totalpages);
> @@ -696,16 +695,12 @@ bool out_of_memory(struct oom_control *oc)
>  	if (p && p != (void *)-1UL) {
>  		oom_kill_process(oc, p, points, totalpages, NULL,
>  				 "Out of memory");
> -		killed = 1;
> -	}
> -out:
> -	/*
> -	 * Give the killed threads a good chance of exiting before trying to
> -	 * allocate memory again.
> -	 */
> -	if (killed)
> +		/*
> +		 * Give the killed process a good chance to exit before trying
> +		 * to allocate memory again.
> +		 */
>  		schedule_timeout_killable(1);
> -
> +	}
>  	return true;
>  }
>  
> --
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-- 
Michal Hocko
SUSE Labs
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