[patch 6/8] vmscan: change zone_nr_lru_pages to take memcg instead of scan control

[Johannes Weiner <hannes@cmpxchg.org>]

This function only uses sc->mem_cgroup from the scan control.  Change
it to take a memcg argument directly, so callsites without an actual
reclaim context can use it as well.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/vmscan.c |   22 ++++++++++++----------
 1 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7d74e48..9c51ec8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -205,10 +205,11 @@ static struct zone_reclaim_stat *get_reclaim_stat(struct zone *zone,
 }
 
 static unsigned long zone_nr_lru_pages(struct zone *zone,
-				struct scan_control *sc, enum lru_list lru)
+				       struct mem_cgroup *mem,
+				       enum lru_list lru)
 {
-	if (!scanning_global_lru(sc))
-		return mem_cgroup_zone_nr_pages(sc->mem_cgroup, zone, lru);
+	if (mem)
+		return mem_cgroup_zone_nr_pages(mem, zone, lru);
 
 	return zone_page_state(zone, NR_LRU_BASE + lru);
 }
@@ -1780,10 +1781,10 @@ static void get_scan_count(struct zone *zone, struct scan_control *sc,
 		goto out;
 	}
 
-	anon  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
-		zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
-	file  = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_FILE) +
-		zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+	anon  = zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_ACTIVE_ANON) +
+		zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_INACTIVE_ANON);
+	file  = zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_ACTIVE_FILE) +
+		zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_INACTIVE_FILE);
 
 	if (global_reclaim(sc)) {
 		free  = zone_page_state(zone, NR_FREE_PAGES);
@@ -1846,7 +1847,7 @@ out:
 		int file = is_file_lru(l);
 		unsigned long scan;
 
-		scan = zone_nr_lru_pages(zone, sc, l);
+		scan = zone_nr_lru_pages(zone, sc->mem_cgroup, l);
 		if (priority || noswap) {
 			scan >>= priority;
 			scan = div64_u64(scan * fraction[file], denominator);
@@ -1903,8 +1904,9 @@ static inline bool should_continue_reclaim(struct zone *zone,
 	 * inactive lists are large enough, continue reclaiming
 	 */
 	pages_for_compaction = (2UL << sc->order);
-	inactive_lru_pages = zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON) +
-				zone_nr_lru_pages(zone, sc, LRU_INACTIVE_FILE);
+	inactive_lru_pages =
+		zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_INACTIVE_ANON) +
+		zone_nr_lru_pages(zone, sc->mem_cgroup, LRU_INACTIVE_FILE);
 	if (sc->nr_reclaimed < pages_for_compaction &&
 			inactive_lru_pages > pages_for_compaction)
 		return true;
-- 
1.7.5.2

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