linux-kernel - Re: [RFC][PATCH 1/2] memcg: res

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Date:	Mon,  2 Jun 2008 11:15:40 +0900 (JST)
From:	yamamoto@...inux.co.jp (YAMAMOTO Takashi)
To:	kamezawa.hiroyu@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	balbir@...ux.vnet.ibm.com, xemul@...nvz.org, menage@...gle.com,
	lizf@...fujitsu.com
Subject: Re: [RFC][PATCH 1/2] memcg: res_counter hierarchy

> @@ -135,13 +138,118 @@ ssize_t res_counter_write(struct res_cou
>  		if (*end != '\0')
>  			goto out_free;
>  	}
> -	spin_lock_irqsave(&counter->lock, flags);
> -	val = res_counter_member(counter, member);
> -	*val = tmp;
> -	spin_unlock_irqrestore(&counter->lock, flags);
> -	ret = nbytes;
> +	if (member != RES_LIMIT || !callback) {

is there any reason to check member != RES_LIMIT here,
rather than in callers?

> +/*
> + * Move resource to its parent.
> + *   child->limit -= val.
> + *   parent->usage -= val.
> + *   parent->limit -= val.

s/limit/for_children/

> + */
> +
> +int res_counter_repay_resource(struct res_counter *child,
> +				struct res_counter *parent,
> +				unsigned long long val,
> +				res_shrink_callback_t callback, int retry)

can you reduce gratuitous differences between
res_counter_borrow_resource and res_counter_repay_resource?
eg. 'success' vs 'done', how to decrement 'retry'.

YAMAMOTO Takashi
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