[PATCH 04/11] make get_scan_ratio() to memcg safe

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

Currently, get_scan_ratio() always calculate the balancing value for global reclaim and
memcg reclaim doesn't use it.
Therefore it doesn't have scan_global_lru() condition.

However, we plan to expand get_scan_ratio() to be usable for memcg too, latter.
Then, The dependency code of global reclaim in the get_scan_ratio() insert into
scan_global_lru() condision explictly.


this patch doesn't have any functional change.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
 mm/vmscan.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1435,13 +1435,16 @@ static void get_scan_ratio(struct zone *
 		zone_nr_pages(zone, sc, LRU_INACTIVE_ANON);
 	file  = zone_nr_pages(zone, sc, LRU_ACTIVE_FILE) +
 		zone_nr_pages(zone, sc, LRU_INACTIVE_FILE);
-	free  = zone_page_state(zone, NR_FREE_PAGES);
 
-	/* If we have very few page cache pages, force-scan anon pages. */
-	if (unlikely(file + free <= zone->pages_high)) {
-		percent[0] = 100;
-		percent[1] = 0;
-		return;
+	if (scan_global_lru(sc)) {
+		free  = zone_page_state(zone, NR_FREE_PAGES);
+		/* If we have very few page cache pages,
+		   force-scan anon pages. */
+		if (unlikely(file + free <= zone->pages_high)) {
+			percent[0] = 100;
+			percent[1] = 0;
+			return;
+		}
 	}
 
 	/*


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