linux-kernel - Re: Memory overcommit

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Message-ID: <alpine.DEB.2.00.0910272111400.8988@chino.kir.corp.google.com>
Date:	Tue, 27 Oct 2009 21:12:38 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	vedran.furac@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, minchan.kim@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: Memory overcommit

On Wed, 28 Oct 2009, KOSAKI Motohiro wrote:

> I agree quartering is debatable.
> At least, killing quartering is worth for any user, and it can be push into -stable.
> 

Not sure where the -stable reference came from, I don't think this is a 
candidate.

> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index ea2147d..40d323d 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -152,18 +152,15 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
>  	/*
>  	 * Superuser processes are usually more important, so we make it
>  	 * less likely that we kill those.
> -	 */
> -	if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
> -	    has_capability_noaudit(p, CAP_SYS_RESOURCE))
> -		points /= 4;
> -
> -	/*
> -	 * We don't want to kill a process with direct hardware access.
> +	 *
> +	 * Plus, We don't want to kill a process with direct hardware access.
>  	 * Not only could that mess up the hardware, but usually users
>  	 * tend to only have this flag set on applications they think
>  	 * of as important.
>  	 */
> -	if (has_capability_noaudit(p, CAP_SYS_RAWIO))
> +	if (has_capability_noaudit(p, CAP_SYS_ADMIN) ||
> +	    has_capability_noaudit(p, CAP_SYS_RESOURCE) ||
> +	    has_capability_noaudit(p, CAP_SYS_RAWIO))
>  		points /= 4;
>  
>  	/*

Acked-by: David Rientjes <rientjes@...gle.com>
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