[Devel] [PATCH RHEL8 COMMIT] ms/mm/vmscan: remove unused lru_pages argument

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-80.1.2.vz8.3.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-80.1.2.vz8.3.4
------>
commit ce618d8a102c477cd9fea832515281c01b631b74
Author: Andrey Ryabinin <aryabinin at virtuozzo.com>
Date:   Thu Apr 2 16:02:25 2020 +0300

    ms/mm/vmscan: remove unused lru_pages argument
    
    Since 9092c71bb724 ("mm: use sc->priority for slab shrink targets") the
    argument 'unsigned long *lru_pages' passed around with no purpose.  Remove
    it.
    
    Link: http://lkml.kernel.org/r/20190228083329.31892-4-aryabinin@virtuozzo.com
    Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
    
    Acked-by: Johannes Weiner <hannes at cmpxchg.org>
    Acked-by: Vlastimil Babka <vbabka at suse.cz>
    Acked-by: Mel Gorman <mgorman at techsingularity.net>
    Cc: Michal Hocko <mhocko at kernel.org>
    Cc: Rik van Riel <riel at surriel.com>
    Cc: William Kucharski <william.kucharski at oracle.com>
    Cc: John Hubbard <jhubbard at nvidia.com>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
    
    (cherry picked from commit f87bccde6a7dd1bdb219a4045e8ac111590c9314)
    Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 mm/vmscan.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 657cdef38d8e..7e90425d75b1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2110,8 +2110,7 @@ enum scan_balance {
  * nr[2] = file inactive pages to scan; nr[3] = file active pages to scan
  */
 static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
-			   struct scan_control *sc, unsigned long *nr,
-			   unsigned long *lru_pages)
+			   struct scan_control *sc, unsigned long *nr)
 {
 	int swappiness = mem_cgroup_swappiness(memcg);
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
@@ -2262,7 +2261,6 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	fraction[1] = fp;
 	denominator = ap + fp + 1;
 out:
-	*lru_pages = 0;
 	for_each_evictable_lru(lru) {
 		int file = is_file_lru(lru);
 		unsigned long size;
@@ -2302,7 +2300,6 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 			BUG();
 		}
 
-		*lru_pages += size;
 		nr[lru] = scan;
 	}
 }
@@ -2311,7 +2308,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
  * This is a basic per-node page freer.  Used by both kswapd and direct reclaim.
  */
 static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memcg,
-			      struct scan_control *sc, unsigned long *lru_pages)
+			      struct scan_control *sc)
 {
 	struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
 	unsigned long nr[NR_LRU_LISTS];
@@ -2323,7 +2320,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
 	struct blk_plug plug;
 	bool scan_adjusted;
 
-	get_scan_count(lruvec, memcg, sc, nr, lru_pages);
+	get_scan_count(lruvec, memcg, sc, nr);
 
 	/* Record the original scan target for proportional adjustments later */
 	memcpy(targets, nr, sizeof(nr));
@@ -2528,7 +2525,6 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 			.pgdat = pgdat,
 			.priority = sc->priority,
 		};
-		unsigned long node_lru_pages = 0;
 		struct mem_cgroup *memcg;
 
 		memset(&sc->nr, 0, sizeof(sc->nr));
@@ -2538,7 +2534,6 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 
 		memcg = mem_cgroup_iter(root, NULL, &reclaim);
 		do {
-			unsigned long lru_pages;
 			unsigned long reclaimed;
 			unsigned long scanned;
 
@@ -2568,8 +2563,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 
 			reclaimed = sc->nr_reclaimed;
 			scanned = sc->nr_scanned;
-			shrink_node_memcg(pgdat, memcg, sc, &lru_pages);
-			node_lru_pages += lru_pages;
+			shrink_node_memcg(pgdat, memcg, sc);
 
 			if (memcg)
 				shrink_slab(sc->gfp_mask, pgdat->node_id,
@@ -3099,7 +3093,6 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 		.reclaim_idx = MAX_NR_ZONES - 1,
 		.may_swap = !noswap,
 	};
-	unsigned long lru_pages;
 
 	sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
 			(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
@@ -3116,7 +3109,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 	 * will pick up pages from other mem cgroup's as well. We hack
 	 * the priority and make it zero.
 	 */
-	shrink_node_memcg(pgdat, memcg, &sc, &lru_pages);
+	shrink_node_memcg(pgdat, memcg, &sc);
 
 	trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);