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-rw-r--r--mm/vmscan.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 35dd57e99282..1dab3a3ddcd3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2043,10 +2043,16 @@ static void get_scan_count(struct lruvec *lruvec, int swappiness,
}
/*
- * There is enough inactive page cache, do not reclaim
- * anything from the anonymous working set right now.
+ * If there is enough inactive page cache, i.e. if the size of the
+ * inactive list is greater than that of the active list *and* the
+ * inactive list actually has some pages to scan on this priority, we
+ * do not reclaim anything from the anonymous working set right now.
+ * Without the second condition we could end up never scanning an
+ * lruvec even if it has plenty of old anonymous pages unless the
+ * system is under heavy pressure.
*/
- if (!inactive_file_is_low(lruvec)) {
+ if (!inactive_file_is_low(lruvec) &&
+ get_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) {
scan_balance = SCAN_FILE;
goto out;
}