From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757001Ab3BGAzT (ORCPT ); Wed, 6 Feb 2013 19:55:19 -0500 Received: from casper.infradead.org ([85.118.1.10]:56784 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755302Ab3BGAzQ (ORCPT ); Wed, 6 Feb 2013 19:55:16 -0500 Message-ID: <5112FB96.1040606@infradead.org> Date: Wed, 06 Feb 2013 16:55:50 -0800 From: Randy Dunlap User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130105 Thunderbird/17.0.2 MIME-Version: 1.0 To: Zhang Yanfei CC: Andrew Morton , mgorman@suse.de, minchan@kernel.org, kamezawa.hiroyu@jp.fujitsu.com, Linux MM , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] mm: accurately document nr_free_*_pages functions with code comments References: <5112138C.7040902@cn.fujitsu.com> In-Reply-To: <5112138C.7040902@cn.fujitsu.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > --- > 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