linux-kernel - Re: [PATCH 1/2] res_counter : check limit change

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Message-ID: <486DFCCF.3070500@openvz.org>
Date:	Fri, 04 Jul 2008 14:34:55 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"menage@...gle.com" <menage@...gle.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>
Subject: Re: [PATCH 1/2] res_counter : check limit change

KAMEZAWA Hiroyuki wrote:
> Add an interface to set limit. This is necessary to memory resource controller
> because it shrinks usage at set limit.
> 
> (*) Other controller may not need this interface to shrink usage because
>     shrinking is not necessary or impossible in it.
> 
> Changelog:
>   - fixed white space bug.
> 
> Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>

Acked-by: Pavel Emelyanov <xemul@...nvz.org>

> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> 
>  include/linux/res_counter.h |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> Index: test-2.6.26-rc8-mm1/include/linux/res_counter.h
> ===================================================================
> --- test-2.6.26-rc8-mm1.orig/include/linux/res_counter.h
> +++ test-2.6.26-rc8-mm1/include/linux/res_counter.h
> @@ -176,4 +176,19 @@ static inline bool res_counter_can_add(s
>  	return ret;
>  }
>  
> +static inline int res_counter_set_limit(struct res_counter *cnt,
> +	unsigned long long limit)
> +{
> +	unsigned long flags;
> +	int ret = -EBUSY;
> +
> +	spin_lock_irqsave(&cnt->lock, flags);
> +	if (cnt->usage < limit) {
> +		cnt->limit = limit;
> +		ret = 0;
> +	}
> +	spin_unlock_irqrestore(&cnt->lock, flags);
> +	return ret;
> +}
> +
>  #endif
> 
> 

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