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-rw-r--r--mm/vmscan.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 88593b82a8df..c84aba26d257 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2734,6 +2734,21 @@ out:
}
}
+/*
+ * Anonymous LRU management is a waste if there is
+ * ultimately no way to reclaim the memory.
+ */
+static bool can_age_anon_pages(struct pglist_data *pgdat,
+ struct scan_control *sc)
+{
+ /* Aging the anon LRU is valuable if swap is present: */
+ if (total_swap_pages > 0)
+ return true;
+
+ /* Also valuable if anon pages can be demoted: */
+ return can_demote(pgdat->node_id, sc);
+}
+
static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
{
unsigned long nr[NR_LRU_LISTS];
@@ -2843,7 +2858,8 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
* Even if we did not try to evict anon pages at all, we want to
* rebalance the anon lru active/inactive ratio.
*/
- if (total_swap_pages && inactive_is_low(lruvec, LRU_INACTIVE_ANON))
+ if (can_age_anon_pages(lruvec_pgdat(lruvec), sc) &&
+ inactive_is_low(lruvec, LRU_INACTIVE_ANON))
shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
sc, LRU_ACTIVE_ANON);
}
@@ -3678,7 +3694,7 @@ static void age_active_anon(struct pglist_data *pgdat,
struct mem_cgroup *memcg;
struct lruvec *lruvec;
- if (!total_swap_pages)
+ if (!can_age_anon_pages(pgdat, sc))
return;
lruvec = mem_cgroup_lruvec(NULL, pgdat);