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

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Date:	Thu, 7 Feb 2013 15:26:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc:	Randy Dunlap <rdunlap@...radead.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 RESEND] mm: accurately document nr_free_*_pages
 functions with code comments

On Thu, 07 Feb 2013 09:57:27 +0800
Zhang Yanfei <zhangyanfei@...fujitsu.com> 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.

Looks OK.  I fiddled with it a bit:

--- a/mm/page_alloc.c~mm-accurately-document-nr_free__pages-functions-with-code-comments-fix
+++ a/mm/page_alloc.c
@@ -2813,12 +2813,12 @@ void free_pages_exact(void *virt, size_t
 EXPORT_SYMBOL(free_pages_exact);
 
 /**
- * nr_free_zone_pages - get pages that is beyond high watermark
+ * nr_free_zone_pages - count number of pages beyond high watermark
  * @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:
+ * nr_free_zone_pages() counts the number of counts pages which are beyond the
+ * high watermark within all zones at or below a given zone index.  For each
+ * zone, the number of pages is calculated as:
  *     present_pages - high_pages
  */
 static unsigned long nr_free_zone_pages(int offset)
@@ -2842,10 +2842,10 @@ static unsigned long nr_free_zone_pages(
 }
 
 /**
- * nr_free_buffer_pages - get pages that is beyond high watermark
+ * nr_free_buffer_pages - count number of pages beyond high watermark
  *
- * The function counts pages which are beyond high watermark within
- * ZONE_DMA and ZONE_NORMAL.
+ * nr_free_buffer_pages() counts the number of pages which are beyond the high
+ * watermark within ZONE_DMA and ZONE_NORMAL.
  */
 unsigned long nr_free_buffer_pages(void)
 {
@@ -2854,10 +2854,10 @@ unsigned long nr_free_buffer_pages(void)
 EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
 
 /**
- * nr_free_pagecache_pages - get pages that is beyond high watermark
+ * nr_free_pagecache_pages - count number of pages beyond high watermark
  *
- * The function counts pages which are beyond high watermark within
- * all zones.
+ * nr_free_pagecache_pages() counts the number of pages which are beyond the
+ * high watermark within all zones.
  */
 unsigned long nr_free_pagecache_pages(void)
 {
_

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