linux-kernel - Re: [PATCH] mm: add node physical memory range to sysfs

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Message-ID: <20121208194528.GB3897@kroah.com>
Date:	Sat, 8 Dec 2012 11:45:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: add node physical memory range to sysfs

On Fri, Dec 07, 2012 at 02:34:56PM -0800, Davidlohr Bueso wrote:
> This patch adds a new 'memrange' file that shows the starting and
> ending physical addresses that are associated to a node. This is
> useful for identifying specific DIMMs within the system.
> 
> Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
> ---
>  drivers/base/node.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index af1a177..f165a0a 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -211,6 +211,19 @@ static ssize_t node_read_distance(struct device *dev,
>  }
>  static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL);
>  
> +static ssize_t node_read_memrange(struct device *dev,
> +				  struct device_attribute *attr, char *buf)
> +{
> +	int nid = dev->id;
> +	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
> +	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
> +
> +	return sprintf(buf, "%#010Lx-%#010Lx\n",
> +		       (unsigned long long) start_pfn << PAGE_SHIFT,
> +		       (unsigned long long) (end_pfn << PAGE_SHIFT) - 1);
> +}
> +static DEVICE_ATTR(memrange, S_IRUGO, node_read_memrange, NULL);

As you're adding a new sysfs file, we need a Documentation/ABI/ entry as
well.  Yes, the existing ones aren't there already, as Andrew points
out, sorry, but that means you get to document them all :)

thanks,

greg k-h
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