MIME-Version: 1.0
In-Reply-To: <20151109075337.GC472@swordfish>
References: <1447053784-27811-1-git-send-email-iamjoonsoo.kim@lge.com>
	<20151109075337.GC472@swordfish>
Date: Mon, 9 Nov 2015 17:00:32 +0900
Message-ID: <CAAmzW4MugYCu1+ZsRp63o=26eTuJG22C+nNrGBhDJvQDOzbQJw@mail.gmail.com>
Subject: Re: [PATCH 1/2] mm: introduce page reference manipulation functions
From: Joonsoo Kim <js1304@gmail.com>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Michal Nazarewicz <mina86@mina86.com>,
        Minchan Kim <minchan@kernel.org>, Mel Gorman <mgorman@suse.de>,
        Vlastimil Babka <vbabka@suse.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Linux Memory Management List <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>, linux-api@vger.kernel.org,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1445
Lines: 49

2015-11-09 16:53 GMT+09:00 Sergey Senozhatsky
<sergey.senozhatsky.work@gmail.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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/