linux-kernel - Re: [PATCH 1/2] mm: introduce page reference manipulation functions

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Date:	Mon, 9 Nov 2015 17:00:32 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-api@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/2] mm: introduce page reference manipulation functions

2015-11-09 16:53 GMT+09:00 Sergey Senozhatsky
<sergey.senozhatsky.work@...il.com>:
> Hi,
>
> On (11/09/15 16:23), Joonsoo Kim wrote:
> [..]
>> +static inline int page_count(struct page *page)
>> +{
>> +     return atomic_read(&compound_head(page)->_count);
>> +}
>> +
>> +static inline void set_page_count(struct page *page, int v)
>> +{
>> +     atomic_set(&page->_count, v);
>> +}
>> +
>> +/*
>> + * Setup the page count before being freed into the page allocator for
>> + * the first time (boot or memory hotplug)
>> + */
>> +static inline void init_page_count(struct page *page)
>> +{
>> +     set_page_count(page, 1);
>> +}
>> +
>> +static inline void page_ref_add(struct page *page, int nr)
>> +{
>> +     atomic_add(nr, &page->_count);
>> +}
>
> Since page_ref_FOO wrappers operate with page->_count and there
> are already page_count()/set_page_count()/etc. may be name new
> wrappers in page_count_FOO() manner?

Hello,

I used that page_count_ before but change my mind.
I think that ref is more relevant to this operation.
Perhaps, it'd be better to change page_count()/set_page_count()
to page_ref()/set_page_ref().

FYI, some functions such as page_(un)freeze_refs uses ref. :)

Thanks.
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