linux-kernel - Re: [PATCH] mm: accurately document nr_free_*

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Message-ID: <5112FB96.1040606@infradead.org>
Date:	Wed, 06 Feb 2013 16:55:50 -0800
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, mgorman@...e.de,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com,
	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: accurately document nr_free_*_pages functions with
 code comments

On 02/06/13 00:25, Zhang Yanfei wrote:
> Functions nr_free_zone_pages, nr_free_buffer_pages and nr_free_pagecache_pages
> are horribly badly named, so accurately document them with code comments
> in case of the misuse of them.
> 
> Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
> ---
>  mm/page_alloc.c |   23 +++++++++++++++++++----
>  1 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index df2022f..0790716 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2785,6 +2785,15 @@ void free_pages_exact(void *virt, size_t size)
>  }
>  EXPORT_SYMBOL(free_pages_exact);
>  
> +/**
> + * nr_free_zone_pages - get pages that is beyond high watermark
> + * @offset - The zone index of the highest zone

Function parameter format uses a ':', not a '-'.  E.g.,

 * @offset: the zone index of the highest zone


> + *
> + * The function counts pages which are beyond high watermark within
> + * all zones at or below a given zone index. For each zone, the
> + * amount of pages is calculated as:
> + *     present_pages - high_pages
> + */
>  static unsigned int nr_free_zone_pages(int offset)
>  {
>  	struct zoneref *z;
> @@ -2805,8 +2814,11 @@ static unsigned int nr_free_zone_pages(int offset)
>  	return sum;
>  }
>  
> -/*
> - * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL
> +/**
> + * nr_free_buffer_pages - get pages that is beyond high watermark
> + *
> + * The function counts pages which are beyond high watermark within
> + * ZONE_DMA and ZONE_NORMAL.
>   */
>  unsigned int nr_free_buffer_pages(void)
>  {
> @@ -2814,8 +2826,11 @@ unsigned int nr_free_buffer_pages(void)
>  }
>  EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
>  
> -/*
> - * Amount of free RAM allocatable within all zones
> +/**
> + * nr_free_pagecache_pages - get pages that is beyond high watermark
> + *
> + * The function counts pages which are beyond high watermark within
> + * all zones.
>   */
>  unsigned int nr_free_pagecache_pages(void)
>  {
> 


-- 
~Randy
--
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