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Date: Fri, 25 Nov 2011 16:03:33 +0800
From: Wang Sheng-Hui <shhuiw@gmail.com>
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To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, mel@csn.ul.ie
Subject: Re: Question about mm/compaction.c/acct_isolated: computing nr_anon,
 nr_file
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On 2011年11月25日 13:42, Wang Sheng-Hui wrote:
> 
> Why does it double the number in line 233/234?
>  
>  222/* Update the number of anon and file isolated pages in the zone */
>  223static void acct_isolated(struct zone *zone, struct compact_control *cc)
>  224{
>  225        struct page *page;
>  226        unsigned int count[NR_LRU_LISTS] = { 0, };
>  227
>  228        list_for_each_entry(page, &cc->migratepages, lru) {
>  229                int lru = page_lru_base_type(page);
>  230                count[lru]++;
>  231        }
>  232
>  233        cc->nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
>  234        cc->nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
>  235        __mod_zone_page_state(zone, NR_ISOLATED_ANON, cc->nr_anon);
>  236        __mod_zone_page_state(zone, NR_ISOLATED_FILE, cc->nr_file);
>  237}
> 
> thanks,
> 

Sorry, I mistook looking the code. Please ignore the mail.