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

Wang Sheng-Hui
2011-11-25T08:03:44Z

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.