linux-kernel - [PATCH 03/11] mm: vmscan: simplify lruvec_lru

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Date:   Mon,  3 Jun 2019 17:07:38 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: [PATCH 03/11] mm: vmscan: simplify lruvec_lru_size()

This function currently takes the node or lruvec size and subtracts
the zones that are excluded by the classzone index of the
allocation. It uses four different types of counters to do this.

Just add up the eligible zones.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/vmscan.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 853be16ee5e2..69c4c82a9b5a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -342,30 +342,21 @@ unsigned long zone_reclaimable_pages(struct zone *zone)
  */
 unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx)
 {
-	unsigned long lru_size;
+	unsigned long size = 0;
 	int zid;
 
-	if (!mem_cgroup_disabled())
-		lru_size = lruvec_page_state_local(lruvec, NR_LRU_BASE + lru);
-	else
-		lru_size = node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);
-
-	for (zid = zone_idx + 1; zid < MAX_NR_ZONES; zid++) {
+	for (zid = 0; zid <= zone_idx; zid++) {
 		struct zone *zone = &lruvec_pgdat(lruvec)->node_zones[zid];
-		unsigned long size;
 
 		if (!managed_zone(zone))
 			continue;
 
 		if (!mem_cgroup_disabled())
-			size = mem_cgroup_get_zone_lru_size(lruvec, lru, zid);
+			size += mem_cgroup_get_zone_lru_size(lruvec, lru, zid);
 		else
-			size = zone_page_state(&lruvec_pgdat(lruvec)->node_zones[zid],
-				       NR_ZONE_LRU_BASE + lru);
-		lru_size -= min(size, lru_size);
+			size += zone_page_state(zone, NR_ZONE_LRU_BASE + lru);
 	}
-
-	return lru_size;
+	return size;
 
 }
 
-- 
2.21.0