From: Wang Sheng-Hui <shhuiw@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, mel@csn.ul.ie
Subject: Question about mm/compaction.c/acct_isolated: computing nr_anon, nr_file
Date: Fri, 25 Nov 2011 13:42:43 +0800 [thread overview]
Message-ID: <4ECF2AD3.5050801@gmail.com> (raw)
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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next reply other threads:[~2011-11-25 5:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-25 5:42 Wang Sheng-Hui [this message]
2011-11-25 8:03 ` Question about mm/compaction.c/acct_isolated: computing nr_anon, nr_file Wang Sheng-Hui
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