linux-kernel - Re: [patch 2/3] memcg: prevent endless loop when charging huge pages to near-limit group

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Message-Id: <20110131162448.e791f0ae.akpm@linux-foundation.org>
Date:	Mon, 31 Jan 2011 16:24:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	kamezawa.hiroyu@...fujitsu.com, nishimura@....nes.nec.co.jp,
	balbir@...ux.vnet.ibm.com, minchan.kim@...il.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/3] memcg: prevent endless loop when charging huge
 pages to near-limit group

On Tue, 1 Feb 2011 01:04:55 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> Maybe it would be better to use res_counter_margin(cnt) >= wanted
> throughout the code.

yup.

> --- a/include/linux/res_counter.h
> +++ b/include/linux/res_counter.h
> @@ -182,6 +182,14 @@ static inline bool res_counter_check_under_limit(struct res_counter *cnt)
>  	return ret;
>  }
>  
> +/**
> + * res_counter_check_margin - check if the counter allows charging
> + * @cnt: the resource counter to check
> + * @bytes: the number of bytes to check the remaining space against
> + *
> + * Returns a boolean value on whether the counter can be charged
> + * @bytes or whether this would exceed the limit.
> + */
>  static inline bool res_counter_check_margin(struct res_counter *cnt,
>  					    unsigned long bytes)
>  {

mem_cgroup_check_margin() needs some lipstick too.
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