mm: compaction: trivial clean up in acct_isolated()

acct_isolated of compaction uses page_lru_base_type which returns only
base type of LRU list so it never returns LRU_ACTIVE_ANON or
LRU_ACTIVE_FILE.  In addtion, cc->nr_[anon|file] is used in only
acct_isolated so it doesn't have fields in conpact_control.

This patch removes fields from compact_control and makes clear function of
acct_issolated which counts the number of anon|file pages isolated.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/compaction.c b/mm/compaction.c
index 6cc604bd56496e2742e371d63234af08f9f0859b..b2977a5d659a51f5eb5f928605329d8643168136 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -35,10 +35,6 @@ struct compact_control {
        unsigned long migrate_pfn;      /* isolate_migratepages search base */
        bool sync;                      /* Synchronous migration */
 
-       /* Account for isolated anon and file pages */
-       unsigned long nr_anon;
-       unsigned long nr_file;
-
        unsigned int order;             /* order a direct compactor needs */
        int migratetype;                /* MOVABLE, RECLAIMABLE etc */
        struct zone *zone;
@@ -223,17 +219,13 @@ static void isolate_freepages(struct zone *zone,
 static void acct_isolated(struct zone *zone, struct compact_control *cc)
 {
        struct page *page;
-       unsigned int count[NR_LRU_LISTS] = { 0, };
+       unsigned int count[2] = { 0, };
 
-       list_for_each_entry(page, &cc->migratepages, lru) {
-               int lru = page_lru_base_type(page);
-               count[lru]++;
-       }
+       list_for_each_entry(page, &cc->migratepages, lru)
+               count[!!page_is_file_cache(page)]++;
 
-       cc->nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
-       cc->nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
-       __mod_zone_page_state(zone, NR_ISOLATED_ANON, cc->nr_anon);
-       __mod_zone_page_state(zone, NR_ISOLATED_FILE, cc->nr_file);
+       __mod_zone_page_state(zone, NR_ISOLATED_ANON, count[0]);
+       __mod_zone_page_state(zone, NR_ISOLATED_FILE, count[1]);
 }
 
 /* Similar to reclaim, but different enough that they don't share logic */