Question about mm/compaction.c/acct_isolated: computing nr_anon,nr_file

[Wang Sheng-Hui]

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,

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