linux-kernel - Re: [PATCH v2] staging: zcache: support multiple clients, prep for KVM and RAMster

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Date:	Fri, 1 Jul 2011 01:40:19 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Marcus Klemm <marcus.klemm@...glemail.com>,
	kvm@...r.kernel.org, Konrad Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	devel@...uxdriverproject.org
Subject: Re: [PATCH v2] staging: zcache: support multiple clients, prep for
 KVM and RAMster

On Thu, Jun 30, 2011 at 12:01:08PM -0700, Dan Magenheimer wrote:
> +static int zv_curr_dist_counts_show(char *buf)
> +{
> +	unsigned long i, n, chunks = 0, sum_total_chunks = 0;
> +	char *p = buf;
> +
> +	for (i = 0; i <= NCHUNKS - 1; i++) {

It's more common to write the condition as:  i < NCHUNKS.


> +		n = zv_curr_dist_counts[i];

zv_curr_dist_counts has NCHUNKS + 1 elements so we never print
display the final element.  I don't know this coe, so I could be
wrong but I think that we could make zv_curr_dist_counts only hold
NCHUNKS elements.

> +		p += sprintf(p, "%lu ", n);
> +		chunks += n;
> +		sum_total_chunks += i * n;
> +	}
> +	p += sprintf(p, "mean:%lu\n",
> +		chunks == 0 ? 0 : sum_total_chunks / chunks);
> +	return p - buf;
> +}
> +
> +static int zv_cumul_dist_counts_show(char *buf)
> +{
> +	unsigned long i, n, chunks = 0, sum_total_chunks = 0;
> +	char *p = buf;
> +
> +	for (i = 0; i <= NCHUNKS - 1; i++) {
> +		n = zv_cumul_dist_counts[i];

Same situation.

> +		p += sprintf(p, "%lu ", n);
> +		chunks += n;
> +		sum_total_chunks += i * n;
> +	}
> +	p += sprintf(p, "mean:%lu\n",
> +		chunks == 0 ? 0 : sum_total_chunks / chunks);
> +	return p - buf;
> +}
> +

regards,
dan carpenter
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